h782 processmultimeter instruction - aidetek · h782 processmultimeter (hereafter, also referred to...

H782

ProcessMultimeter

Instruction

Shenzhen Huayi Instrument Technology Co., Ltd.

H782 ProcessMultimeter Content

Content

1. Safety Information ……………………………….……1

1.1 Preparation …………………………….………1

1.2 Use …….………………………………2

1.3 Marks ………………………………….…3

1.4 Maintenance ……………………………….……4

2. Description …………………………….………6

2.1 Parts name and relevant description

………………………………….…..8

2.2 Display ……………………………...……10

3. Specification ……………………………...……12

3.1 Summary ……………………………...……12

3.2 Technical index ……………………………...……13

4. Operation guidance ……………. ……………….……20

4.1 Power charging ……………………………...……20

4.2 Auto power off …………………………………...21

4.3 Backlight …………………………………...21

4.4 Reading hold …………………………………...22

4.5 Function switch …………………………………...22

4.6 Relative measurement switch

…………………………………...23

4.7 Measurement preparation …………………………………...24

4.8 DC voltage measurement …………………………………...25

4.9 AC voltage measurement …………………………………...26

H782 ProcessMultimeter Content

4.10 DC current measurement ………………………………….…28

4.11 AC current measurement ………………………………….…29

4.12 Resistance measurement ……………………………….……30

4.13 Capacitance measurement …………………………….………31

4.14 Diode test ……………………………….……32

4.15 Circuit break-and-make test

……………………………….……32

4.16 Frequency measurement ……………………………….……33

4.17 Triode magnification times measurement

…………………………….………34

4.18 Temperature measurement (sensor: thermocouple)

……………………………….……34

4.19 Battery voltage measurement

……………………………….……35

4.20 Current output ……………………………….……36

4.21 Voltage output …………………………….………37

4.22 Frequency output …………………………….………39

4.23 24VDC output ………………………….…………41

5. Maintenance …………………………….………41

5.1 Replace the battery pack …………………………….………41

5.2 Replace the protective tube

…………………………….………42

5.3 Replace the test lead ……………………………….……43

6. Accessories ……………………………….……44

H782 ProcessMultimeter Safety information

1. Safety information

warning

Please pay special attention when using this instrument, improper use may cause electric shock or damage to it. It shall conform to common safety rules and completely follow the safety measures regulated in this instruction.

To make the best of the functions of this instrument and ensure safe operation, please

carefully read and follow the use method in this instruction.

H782 ProcessMultimeter (hereafter, also referred to as ―the instrument‖) complies with GB/T 13978-92 common technical specifications for digital multimeter and meets GB4793.1-1995 (IEC-1010-1：1990) safety requirements for electronic measuring instrument which subjects to Pollution Grade 2 and Overvoltage Criterion CAT II 1000V/CAT III 600V.

Please follow the safety operation guidance to ensure safe use of this instrument.

This instrument may serves you well if use and protect it appropriately.

1.1 Preparation

1.1.1 The user must follow standard safety regulations:

1) Normal protection against electric shock

2) Prevent misuse of the instrument

H782 PrxocessMultimeter ` Safety information

1.1.2 Check if there is any damage results from transportation after receiving this instrument.

1.1.3 Check and confirm if there is any damage after keeping or transporting the instrument in harsh conditions.

1.1.4 The test leads must be in good condition. Check the test leads for insulativity damage and check the lead wire for exposed metal.

1.1.5 It shall use the test leads attached with the meter to ensure safety. Otherwise if necessary, it must use the same test leads or the one with the same grade.

1.2 Use

1.2.1 It must use the proper input/output jack, function and range.

1.2.2 Do not conduct measurement or output out of the indicated value of protection scope within each range.

1.2.3 Do not contact the tip of test lead (metal part) when connecting the instrument to a circuit under measured.

1.2.4 When measuring, if the measured voltage is higher than 60V DC or 30V AC (virtual value), please be noted to keep fingers behind the finger guard on the probe.

1.2.5 Never measure the voltage higher than 1000V between the measuring terminal and the earth.

1.2.6 If in range of current, resistance, capacitance, diode,

break-and-make, temperature, triode or amplification times

H782 PrxocessMultimeter ` Safety information

test, cares shall be taken to avoid connecting the instrument to the voltage source

1.2.7 Before turning the rotary switch to change measuring function, it shall remove the test lead from the circuit-under-test.

1.2.8 When measuring the switch power circuit, the high-voltage pulse on the test point may damage the instrument.

1.2.9 Do not measure the resistance, capacitance, diode and/or break-and-make that is live.

1.2.10 Do not measure the capacitance before the capacitor is completely discharged.

1.2.11 Never use this instrument near explosive gas, vapor or dust.

1.2.12 If any abnormality or failure found on the instrument, please be sure stop using.

1.2.13 Do not use this instrument unless the bottom case is completely fastened.

1.2.14 Do not store or use this instrument in environment with direct sunshine, high temperature and high humidity.

1.3 Marks

Important safety information, please refer to the instruction.

There may be dangerous voltage.

Dual insulation protection (Category II)

CAT The level of pulse withstand voltage provided according to overvoltage (installation) Grade , Pollution Degree 2

H782 PrxocessMeter ` Safety information

of IEC-1010-1.

CAT The level of pulse withstand voltage provided according to overvoltage (installation) Grade , Pollution Degree 2 of IEC-1010-1

Conform to European Union (EU) directives

Earth ground

Protective tube

Low battery power

1.4 Maintenance

1.4.1 Please do not attempt to open the bottom case to adjust or repair the instrument, which should only be carried out by the technician who knows the instrument and electric shock risk well.

1.4.2 Before open the battery cover, the test lead shall be removed from the measured circuit.

1.4.3 Once the symbol appears, please charge the instrument with the attached charger immediately to avoid reading error which may cause electric shock.

1.4.4 To avoid combustion, the replacing protective tube must meet specified voltage and current class: F 0.5A/250V (quick fusing)

1.4.5 It shall clean the instrument with wet cloth and detergent, never use abrasive or solvent.

1.4.6 Rotate the rotary switch to OFF when the instrument is not in use.

1.4.7 It shall charge the instrument regularly or remove the battery if it will be not in use for long, in order to avoid damage.

H782 PrxocessMeter ` Safety information

2. Description

This meter is a portable and specialized process verification

instrument, which presents as a digital verification meter that has

both digital multimeter and signal source function, and can measure

and output signal simultaneously. Its large liquid crystal digital

display can show and measure the output signal value at the same

time, and it is equipped with backlight which makes the user easier

to read the value. It uses large-capacity rechargeable battery pack

and is featured with low voltage indication. Charging and operating

for this instrument can be conducted simultaneously (with a charger).

Signal output and measurement function of the instrument is mainly

designed for on-site verification and service of an instrument in

industrial automation field. This instrument is also featured with

multimeter function, which makes it an ideal option for field

meterman, computer distributed control system maintainer, meter

mounter, and can be used as a multimeter by the meterman.

- It delivers 24V DC voltage output (Imax=30mA), which may be used

to supply operating source to two-wire system meter.

- Current output.

- mV output.

- Frequency output.

- Voltage output.

- The process verification multimeter is used for DC voltage, AC voltage, DC current, AC current, resistance, capacitance, frequency, temperature and break-and-make, diode and triode test.

- When using, the instrument displays the measured value and its unit symbol.

- The instrument is featured with range auto-switch, reading hold and relative measurement.

H782 ProcessMultimeter Description

2.1 Parts names and relevant descriptions

1

2

3

4

5

6

7

8

9

10 13

12 11


1) LCD (Liquid crystal display): displays the measured reading and see the magnitude of output signal.

2) ▲Key: to control the output signal to a low increasing speed.

3) ▲Key: to control the output signal to a high increasing speed.

4) ▼/HOLD Key: to control the output signal to a high reducing speed (output display area) or to hold the measured reading (measurement display area)

5) ▼/REL Key: to control the output signal to low reducing speed (output display area) or to read the relative measurement (measurement display area)

6) FUNC Key: to switch among output voltage (output display area), current, frequency, or to switch input signal types (measurement display area).

7) RANGE Key: to switch the range of output signal and turn on/off the backlight.

8) SHIFT Key: to determine whether the key for output or measurement.

9) Rotary switch: to select output measurement function and power switch.

14

15


10）INPUT + jack: positive terminal of connection for voltage, current, resistance, frequency, temperature, capacitance, diode, triode, break-and-make position input.

11）INPUT — Jack: common terminal for measurement.

12）OUTPUT — Jack: negative terminal for output signal.

13）OUTPUT + Jack: positive terminal for output signal

14）Charge Terminal

15）24VDC Output Terminal

2.2 Display

① ②


1） ①Measurement display area

2） ②Output display area

Symbol Description Sym

bol

Description

INPUT Input signal ℃ Centigrade (temperature)

OUTPU

T

Output signal

F Farad (Capacitance)

RS232 Reserve Ω Ohm (resistance)

AUTO Auto range V Volt (voltage)

~ AC Alternating current

A Ampere (current)

DC Direct current

Hz Hertz (frequency)

Δ

Relative measurement

% Duty cycle (square wave)

H Reading hold

n、μ

m、k

M

Unit symbol: nano, micro, milli,

kilo, million

Buzzing for break-and-make test

Diode test

hFE Triode test Low battery power

H782 ProcessMultimeter Specification

3. Specification

It shall define one year as the calibration period of the instrument, which shall be taken place in environment with temperature 18℃ ～ 28℃ and relative humidity 75%.

3.1 Summary

3.1.1 30V overload protection for two output terminals.

3.1.2 Auto range.

3.1.3 Overload protection within full range.

3.1.4 The max allowable voltage between the measuring terminal and the earth: 1000V DC or AC (virtual value)

3.1.5 Operation elevation: max 2000m

3.1.6 Display: LCD, which can show output and measured data simultaneously.

3.1.7 Max displayed value: 3999 number.

3.1.8 Polarity indication: auto indicating, ‗-‘ refers to the negative polarity.

3.1.9 Outrange indication: ‗OL‘ or ‘-OL.‘

3.1.10 Sampling frequency: about 0.4sec/time.

3.1.11 Unit display: display function and electric quantity unit.

3.1.12 Time for auto power off: 15 minutes.

3.1.13 Self-recovery fuse specification: 500mA/250V.

3.1.14 Operating source: 1.2V×4 AA battery pack with

capacity2000mAH.

3.1.15 Battery undervoltage indication: LCD shows symbol .

3.1.16 Temperature coefficient: lower than 0.1× accuracy/℃

3.1.17 Operating temperature: -10℃ ～ 40℃

3.1.18 Storage temperature: -20℃ ～ 50℃

3.1.19 Size: 195×92×55mm

3.1.20 Weight: about 600g (including the battery)


3.2 Technical index

Operating temperature : 23 5℃ Relative humidity: <75%

3.2.1 DC voltage

Range Resolution

Accuracy

400mV 0.1mV

± (0.1% reading + 3 figures) 4V 1mV

40V 10mV

400V 100mV

1000V 1V

- Input impedance: 10MΩ

- Overload protection: 400mV range: 250V DC or AC (virtual value), 4V-1000V range: 1000V DC or 750V AC (virtual value)

- Max input voltage: 1000V DC

Note:

Within the low voltage range, if the test lead is not connected to the circuit under measured, the reading displayed on the instrument may pulse, which should be considered normal for it is caused by the high accuracy of the instrument; if connect the test lead to the circuit

under measured, the true measured value will be captured.


3.2.2 AC voltage

Range Resolution

Accuracy

4V 1mV

(0.8% reading + 3 figures) 40V 10mV

400V 100mV

700V 1V (1.0% reading + 10 figures)

- Input impedance: 10MΩ

- Overload protection: 1000V DC or 700V AC (virtual value)

- Max input voltage: 700V AC (virtual value)

- Frequency range: 40 ~ 400Hz

- Display: mean value (virtual value of sine wave)

Note:

Within the low voltage range, if the test lead isn‘t connected to the circuit under measured, the reading displayed on the instrument may pulse, which should be considered normal for it is caused by the high accuracy of the instrument; if connect the test lead to the circuit under measured, the true measured value will be captured.


3.2.3 DC current

Range Resolution

Accuracy

400A 0.1A

(0.1% reading + 5 figures) 4000A 1A

40mA 10A

400mA 100A

- Overload protection:

A, mA range: quick fusing cartridge fuse 500mA/250V

- Voltage drop

400A range: 400mV, 4000A range: 4V,

40mA range: 400mV, 400mA range: 4V

3.2.4 AC current

Range Resolution

Accuracy

400A 0.1A

(1% reading + 5 figures) 4000 A 1A

40mA 10A

400mA 100A

- Overload protection:

A, mA range: quick fusing cartridge fuse 500mA/250V

- Voltage drop

400μA range: 400mV, 4000μA range: 4V,

40mA range: 400mV, 400mA range: 4V,

- Frequency range: 40 ～ 400Hz



400μA range: 400mV, 4000μA range: 4V,

40mA range: 400mV, 400mA range: 4V,

- Frequency range: 40 ～ 400Hz


3.2.5 Resistance

Range Resolution

Accuracy

400Ω 0.1Ω

(0.3% reading + 5 figures) 4kΩ 1Ω

40kΩ 10Ω

400kΩ 100Ω

4MΩ 1kΩ

40MΩ 10kΩ (2.0% reading + 5 figures)

- Open-circuit voltage: about 0.25V

- Overload protection: 250V DC or AC (virtual value)

3.2.6 Capacitance

Range Resolution

Accuracy

40nF 10pF

(2.0% reading + 10 figures)

400nF 0.1nF

4F 1nF

40F 10nF

100F 100nF


H782 ProcessMultimeter

3.2.7 Frequency

Range Resolution

Accuracy

9.999Hz 0.001Hz

10 figures

99.99Hz 0.01Hz

999.9Hz 0.1Hz

9.999kHz 1Hz

99.99kHz 10Hz

199.9kHz 100Hz

>200kHz Only for reference

1) Measuring range: 0 ~5MHz

---

2) Input frequency amplitude: when in 0～100kHz, the amplitude is higher than 500mV。

when in 100kHz～5MHz, the amplitude is higher than 3V.

3）Input frequency amplitude shall not be higher than 10V.

4）Overload protection: 250V DC or AC (virtual value)


3.2.8 Circuit break-and-make test

Range Function

If the resistance of circuit under measured lower than 40, the buzzer in the instrument makes sounds.

- Open-circuit voltage: about 0.5V


3.2.9 Diode test

Range Resolution

Function

1mV Indicate the approximate value of forward voltage of diode

- The forward DC current is about 1mA

- The backward DC voltage is about 1.5V


3.2.10 Triode test hFE: 0～4000

- Overload protection: quick fusing cartridge fuse 500mA/250V。

3.2.11 Temperature measurement: K-type thermoelectric couple (optional).

- Overload protection: quick fusing cartridge fuse 500mA/250V。


3.2.12 DC voltage signal

Range Resolution

Accuracy

10V 10mV ± (0.1% reading + 5 figures)

100mV 100μV

3.2.13 DC voltage signal

Range Resolution

Accuracy

22mA 10μA ±(0.1% reading + 5 figures)

- Load capacity: 0～800Ω (over 1kΩ below 20mA).

3.2.14 Frequency signal

Range Resolution Accuracy

1～100Hz 0.01Hz ±0.1Hz

100Hz ～

1kHz

0.1Hz ±0.5 Hz

1～10kHz 1Hz ±5 Hz

- Square wave, duty cycle 50%, amplitude 4V.

3.2.15 24V DC voltage output

Voltage Accuracy

Load capacity

24V 2% 30mA

H782 ProcessMultimeter Operation guidance

4. Operation guidance

4.1 Power charging

Considering the actual condition of field use, AC and DC power sources are both available to this instrument. There are a pack of rechargeable batteries inside this instrument. In condition there is 220V AC current, the attached charger can be used to supply operating source to the instrument (charging the battery at the same time). When the voltage of the battery pack is lower than 4.4V, the symbol (undervoltage) appears. The instrument shall be charged with 220V AC current.

Generally, it shall power off the instrument before charging, and

then use the attached charger to charge the battery, which shall

follow below steps:

1) Plug the charger into 220V AC socket, then the green Indicator

light will be on.

2) Use the connecting cable to connect the charger to the Charge

terminal on the top of the instrument, then the indicator light

will be converted from green to red, which indicates that the

instrument in charging.

3) When the indicator light converted from red to green, it

indicates an end to thi charging. The charging shall last for4~6

hours.

The battery shall be full charged in each charging, otherwise its service life may be influenced. Generally, a full charged battery can work for more than 24 hours, and under the condition with maximum output current 20mA, it may deliver 8 hours of continuous service. If the work time of the instrument is significantly reduced, it shall take a replacement of the battery into account.


4.2 Auto power off

1) If there is no any operation (except pressing SHIFT) within 15 minutes after power on, the output display area and measurement

display area of the instrument will turn to sleeping state through power off to save electricity energy.

2) After power off, if turn the rotary switch or press any one of ▼/HOLD, ▼/REL and FUNC key, the measurement display area restores to normal operation. If in output state, pressing FUNC key may make the output display area restore to normal operation.

3) If press and hold FUNC key to power on, the auto power off function of measurement display area will be cancelled.

4.3 Backlight

1) If it is difficult to read figures due to poor light condition in measuring, RANGE key may be long pressed for over 2s to turn on the backlight.

2) Long press the RANGE over 2s again may turn off the backlight.

3) After the backlight is on, if RANGE is not long pressed for over 2s, it will be auto turned off 10s later.

Note:

1) The illuminant of backlight is LED with high operating current. Though this instrument has timing circuit (the set interval is about 10s, i.e., the backlight will be auto turned off 10s later after turned it on), but frequent use of the backlight will reduce the life of battery, it shall use the backlight as less as possible, unless necessary.

2) The brightness of the backlight will decline along with the reduced voltage of battery pack.


4.4 Reading hold

1）If reading hold is required in measuring, it may press ▼/HOLD, then the buzzer makes a sound, the value displayed in the measurement display area is locked.

2）Press ▼ again, then the buzzer makes a sound, the reading hold state is removed.

4.5 Function switch

1）In voltage, current range, press FUNC, the instrument will be switched between AC and DC.

2) In diode and break-and-make range, press FUNC, the instrument will be switched between the two ranges.

4.6 Relative measurement switch

1）When measuring, press ▼/REL, then the instrument go to relative measurement state with initial reading returned to zero.

2) In relative measurement state, if current displayed value is stored in the memory as the reference value, in future measurement, the displayed value will be the difference value results from subtracting the reference value from the input value. i.e., ▼/REL（current reading）= input value – reference value.

3) After pressing ▼/REL, the instrument enters into manual range mode.

4) In REL measurement state, by pressing this key again, the relative measurement (△) function is removed.

5) In reading hold state, by pressing this key, the reading hold is cancelled, and the actual measured valued is stored in the memory as the reference value, in future measurement, the displayed value will be the difference value results from subtracting the reference value from the input value.

6) Press FUNC key or turncap switch both lead to cancel of REL measurement mode to return to normal measurement state (the symbol △ on the screen disappears).


7) OL triggering: in REL mode, when the input value higher than the allowable value within this range, it shows OL, press this key again, the relative value measurement function cancels; when OL is showing on the screen, REL mode is not accessible.

4.7 Measurement preparation

1) Turn the rotary switch, switch on the power. If the battery voltage is low (≤4.4V approximately), the display shows the symbol

,which indicates that the battery pack needs to be charged.

2) The symbol nearby the input wire indicates the input voltage or current shall not be higher than indicated value, in order to protect the internal line from damage.

3) Turn the rotary switch to required measuring function and range.

4) When connecting wires, the common test wire shall be connected first, then the live test wire. And when removing wires ,the live test wire shall be removed first.

5) Never measure high voltage or current when the rotary switch is

at ―Ω‖ scale.

And never carry out misoperation of voltage measuring when the

rotary switch is at ―mA‖ or ―μA‖ scale, inorder to avoid damage to

the instrument.

6) Do not connect the test lead to measured signal when turning the

rotary switch.


4.8 DC voltage measurement

Warning

Electric shock danger.

It shall pay special attention to avoid electric shock when measuring high voltage.

Do not input voltage higher than DC1000V, higher voltage value display is accessible, but may expose the internal line in risk of damage.

4.8.1 Turn the rotary switch to V scale. It shows measuring unit

―mV‖, signal type ―DC‖ and auto switch range mark ―AUTO‖ in

LCD measurement display area at this moment.

4.8.2 If the signal type is ―AC‖, it shall press FUNC to switch it to ―DC‖.

If switching is not available, press SHIFT.

4.8.3 Respectively plug the black test lead and the red test lead into INPUT— jack and OUTPUT+ jack.

4.8.4 Connect the test leads to the two terminals of voltage source or load in parallel for measuring.

4.8.5 Read values in the measurement display area of LCD. Polarity indication will show the polarity of terminal connected with the red test lead.

~ — ---


Note

1) Within the low voltage range, if the test lead isn‘t connected to the circuit under measured, the reading displayed on the instrument may pulse, which should be considered normal for it is caused by the high accuracy of the instrument; if connect the test lead to the circuit under measured, the true measured value will be captured.

4.9 AC voltage measurement

Warning


It shall pay special attention to avoid electric shock when measuring high voltage.

Do not input voltage higher than DC750V, higher voltage value display is accessible, but may expose the internal line in risk of damage.

4.9.1 Turn the rotary switch to V scale. It shows measuring unit

―V‖, signal type ―DC‖ and auto switch range mark ―AUTO‖ in LCD

measurement display area at this moment.

4.9.2 Press FUNC to switch it to AC measuring state, the measurement

display area shows signal type ―AC‖. If switching is not available,

press SHIFT.

~ — ---

4.9.3 Respectively plug the black test lead and the red test lead into INPUT— jack and OUTPUT+ jack.

4.9.4 Connect the test leads to the two terminals of voltage source or load in parallel for measuring.

4.9.5 Read values in the measurement display area of LCD.


Note:

1) Within the low voltage range, if the test lead isn‘t connected to the circuit under measured, the reading displayed on the instrument may pulse, which should be considered normal for it is caused by the high accuracy of the instrument; if connect the test lead to the circuit under measured, the true measured value will be captured.

4.10 DC current measurement

Warning


It shall power off the circuit under measured first, then connect the instrument to circuit in serials for measuring,

Do not input current higher than 400mA, excessive current will burn out the protective tube.

4.10.1 Turn the rotary switch to mA or μA ，if the range is

unknown, it‘d better turn it to mA , LCD shows measuring unit

―mA‖ or ―μA‖ with type ―DC‖ (direct current) at the moment.

4.10.2 If the signal type is ―AC‖, it shall press FUNC to switch it to

―DC‖. If switching is not available, press SHIFT.

~ — ---

~ — ---

~ — ---

4.10.3 Respectively plug the black test lead and the red test lead into INPUT— jack and INPUT+ jack.

4.10.4 Connect the test leads to the circuit under measured in serials for measuring.


H782 ProcessMultimeter Operation guidanc

4.11 AC current measurement

Warning


It shall power off the circuit under measured first, then connect the instrument to circuit in serials for measuring,

Do not input current higher than 400mA, excessive current will burn out the protective tube.

4.11.1 Turn the rotary switch to mA or μA ，if the range is

unknown, it‘d better turn it to mA , LCD shows measuring unit

―mA‖ or ―μA‖ with type ―DC‖ (direct current) at the moment.

4.11.2 Press FUNC to switch it to AC measuring state with type ―AC‖.

If switching is not available, press SHIFT.

4.11.3 Respectively plug the black test lead and the red test lead into INPUT—NPUT+ jack.

4.11.4 Connect the test leads to the circuit under measured in serials for measuring.

~ — ---

~ — --- ~ — ---



4.12 Resistance measurement

Warning


When measuring the impedance of the line, it shall confirm if the circuit source is disconnected and the capacitor on the circuit is completely discharged.

4.12.1 Turn the rotary switch to Ω, LCD shows unit MΩ. And It shows

―OL‖ when exceeding the max range 40MΩ。


4.12.3 Connect the test leads to the two terminals of the resistance or circuit under measured for measuring.


Note:

1) When input into an open circuit, LCD shows outrange state ―OL‖.

2) If the resistance of the resistor under measured is higher than

1MΩ, it will take several seconds for the instrument to read stably, which is normal for high resistance value reading.


4.13 Capacitance measurement

Warning


It shall discharge the capacitor completely before measuring the capacitor to avoid electric shock.

4.13.1 Turn the rotary switch to , LCD shows measuring unit ―nF‖.


4.13.3 Connect the test leads to the two terminals of the capacitor after completely discharged for measuring.


Note:

1) If measure a capacitor with large capacity, it will take several seconds for the instrument to read stably (30s at 200μF scale).

2) When input into an open circuit, LCD may show the reading, and ▼/REL key could by pressed to return it to zero for another measuring.

3) When measuring the capacitor is not easy for the test lead, it may use the multitap attached with the instrument.


4.14 Diode test

4.14.1 Turn the rotary switch to .


4.14.3 Press FUNC to switch to measuring state. LCD shows type symbol ― ‖ with unit ―V‖. If switching is not available, press SHIFT.

4.14.4 Respectively connect the red test lead and the black test lead to the positive pole and negative pole of the diode for testing.

4.14.5 The reading showed in the LCD measurement display area is the forward voltage drop of diode.

Note:

1) The reading showed on the instrument is the approximation of forward voltage drop of diode.

2) If the test lead is connected backward or is open-circuit, LCD shows ―OL‖.

4.15 Circuit break-and-make test

Warning


It shall confirm if the circuit source is disconnected and the capacitor on the circuit is completely discharged before testing the circuit break-and-make.

4.15.1 Turn the rotary switch to .


4.15.3 Press FUNC to switch to break-and-make test state. LCD shows the type symbol ― ‖ with unit ―Ω‖. If switching is not available, press SHIFT.


4.15.4 Connect the test leads to the two terminals of the circuit for measuring.

4.15.5 If the resistance of the circuit under measured is lower than 40, the buzzer inside the instrument will make sounds.

4.15.6 Read the resistance value in the measurement display area of LCD.

Note:

If the test lead is open-circuit (or the resistance of circuit under measured is higher than 400), the display shows ―OL‖.

4.16 Frequency measurement

4.16.1 Turn the rotary switch to Hz, LCD shows measurement unit

―Hz‖.


4.16.3 Connect the test leads to the two terminals of the power source or load for measuring.


4.17 Triode magnification times hFE measurement

4.17.1 Turn the rotary switch to hFE, LCD shows ―hFE‖.

4.17.2 Respectively plug the ―COM‖ joint pin and the ―IN‖ joint pin into

INPUT— jack and INPUT+ jack.

4.17.3 Plug the triode into relevant position of multitap depending on

the type of triode (PNP or NPH).



4.18 Temperature measurement

Warning

INPUT jack shall not be connected with electricity signal to avoid damage to the instrument.

4.18.1 Turn the rotary switch to ―℃‖, LCD shows measuring unit ―℃‖ and

measured value ―OL‖.

4.18.2 Respectively put the red plug and black plug of the k-type

thermoelectric couple into OUTPUT jack+ and INPUT— jack,

and contact the test probe of the thermoelectric couple with

measured object or area for measuring.


4.18.4 Make the two test leads short-circuit connected to display

environment temperature.

Note:

There is no cold junction compensation to the k-type thermoelectric

couple when measuring the temperature with the instrument.



4.18.4 Make the two test leads short-circuit connected to display

environment temperature.

Note:

There is no cold junction compensation to the k-type thermoelectric

couple when measuring the temperature with the instrument.

4.19 Battery voltage measurement

Warning

INPUT jack shall not be connected with electricity signal to avoid damage to the

instrument.

4.19.1 Turn the rotary switch to ―Vbat‖, the measurement display area

of LCD shows the same information as that of voltage

measurement.

4.19.2 The reading showed on the measurement display area of LCD is

current battery voltage.

4.19.3 When the battery voltage is lower than 4.3V, it shall be charged immediately.

Note:

This function provides convenience for understanding of the state of

the battery used in this instrument timely.


4.20 Current output

Warning

OUTPUT jack shall not be connected with the voltage higher than 30V to avoid damage to the instrument.

4.20.1 Turn the rotary switch until it leaves OFF to power on.

4.20.2 Press SHIFT to make all keys under used for output state.

4.20.3 Press FUNC to select output signal type (such as current

output). The output display area of LCD shows type ―DC‖ with

measuring unit ―mA‖.

4.20.4 Respectively plug the red test clip and the black test clip into

OUTPUT+ and OUTPUT—, then the current flows out from the

red test clip and flow into the black test lead.

4.20.5 The magnitude of signal shall be adjusted with key ―▲‖, ―▼‖, ―▲‖

and ―▼‖.

4.20.6 The reading in the measurement display area of LCD is the

magnitude of current output current.

Note:

1) Current output is source output, which requires the external to

constitute a loop. i.e., it shall make a short-circuit connection

between the two test clips or connect to appropriate load.

2) Max output current could be up to 24mA when the load resistance is

below 800Ω. If the resistance is higher than 800Ω, the current

declines.

3) When adjusting the signal, click ―▲‖ or ―▼ to change one or two figures of the output signal approximatively. When pressing and holding any of these keys, the output signal changes continuously.

H782 ProcessMete Operation guidance

4) When adjusting the signal, click ―▲‖ or ―▼‖ to change dozens of figures of the output signal approximatively. When pressing and holding any of these keys, the output signal changes continuously.

5) By pressing ▲+▲ simultaneously, the output current rises to its max value, while pressing ▼+▼, the output current declines to its min value.

4.21 Voltage output

Warning

OUTPUT jack shall not be connected with the voltage higher than 30V to avoid damage to the instrument.

4.21.1 Turn the rotary switch until it leaves OFF to power on the instrument.


4.21.3 Press FUNC to select output signal type (such as voltageoutput).Then the output display area of LCD shows type ―DC‖ with measuring unit ―V‖.

4.21.4 The voltage output has two scales: 0～10V and 0～100mV, which

can be switched using RANGE key to ensure different

resolutions.


OUTPUT+ and OUTPUT—. The former is the positive terminal

of the voltage while the latter is the negative terminal.

4.21.6 The magnitude of signal shall be adjusted with key ―▲‖, ―▼‖, ―▲‖ and ―▼‖.

4.21.7 The reading showed in the measurement display area of LCD is the magnitude of current output voltage.


Note:

1) There is overload protection for the output, the output voltage load

shall not be higher than 20mA.

2) When adjusting the signal, click ―▲‖ or ―▼ to change one or two

figures of the output signal approximatively. When pressing and

holding any of these keys, the output signal changes continuously.

3) When adjusting the signal, click ―▲‖ or ―▼‖ to change dozens of



4) By pressing ▲+▲ simultaneously, the output voltage rises to its max value, while pressing ▼+▼, the output voltage declines to its min value.

4.22 Frequency output

Warning

OUTPUT jack shall not be connected with voltage higher than 30V to avoid damage to the instrument.

4.22.1 Turn the rotary switch until it leaves OFF to power on the

instrument.


4.22.3 Press FUNC to select output signal type (such as

frequency output).

Then the output display area of LCD shows measuring unit ―kHz‖.


Then the output display area of LCD shows measuring unit ―kHz‖.

4.22.4 The frequency output has two scales: 0～1kHz and 0～10kHz, which can be switched using RANGE key to ensure different resolutions.


OUTPUT+ and OUTPUT—. The former is the positive terminal

of the voltage while the latter is the negative terminal.

4.22.6 The magnitude of signal shall be adjusted with key ―▲‖, ―▼‖, ―▲‖

and ―▼‖.

4.22.7 The reading showed on the measurement display area of LCD is

the magnitude of current output frequency.

Note:

1) The output amplitude of output frequency is 4V, square wave.

2) When adjusting the signal, click ―▲‖ or ―▼ to change one or two



3) When adjusting the signal, click ―▲‖ or ―▼‖ to change dozens of

figures of the output signal approximatively. When pressing

and holding any of these keys, the output signal changes

continuously.

4) By pressing ▲+▲ simultaneously, the output frequency rises to its

max value, while pressing ▼+▼, the output voltage declines to its min

value.


4.23 24V DC output

4.25.1 Turn the rotary switch until it leaves OFF to power on the instrument.

4.25.2 There is 24 V terminal at the front of the instrument for 24V source output.

Note:

1）This 24V power source can deliver 30mA current output and contains short-circuit protection device inside.

5. Maintenance

5.1 Replace the battery pack

Warning

It shall remove the test lead from the circuit under measured before opening the battery cover of the instrument to avoid electric shock danger.

5.1.1 If the service life of battery pack reduced significantly after fully charged, it indicates the battery pack shall be replaced.

5.1.2 Unscrew the fastening screw on the battery cover to remove them.

5.1.3 Replace the used battery pack.

5.1.4 Put the battery cover back.

Note:

The polarity of battery pack shall not be fitted reversed, and the replacing battery pack shall be with the same specification as the one under replaced.

H782 ProcessMultimeter Maintenance

5.2 Replace the protective tube

Warning

It shall remove the test lead from the circuit under measured before opening the battery cover of the instrument to avoid electric shock danger.

To avoid catching fire, the specified class of replacing protective tube is: F 0.5A/250V (quick fusing)

5.2.1 The protective tube seldom needs replacement, a burn-out of this almost always due to misoperation.

5.2.2 Unscrew the fastening screw on the battery cover and remove them.

5.2.3 Replace the protective tube with the one with specified class.

5.2.4 Put the battery cover back.

5.3 Replace the test lead

Warning

The replacing test lead shall use the same one as the original test lead or the one with the same class. The test lead shall be in good condition of which the class is : 1000V 10A.

If the isolating layer damaged, for instance, the metal wire of the lead exposed, the test lead must be replaced.

H782 ProcessMultimeter Maintenance

6. Accessories

1） Test leads Class: 1000V 10A

A pair

2） Thermoelectric couple

k-type TP01 A pair

3） Multi-purpose socket

MS3201 One

3） Instruction H782 One

4） Test clip MS3102 A pair

5） Charger HY-2 One

6） 24V output wire

One

7） Certification One

Shenzhen Huayi Instrument Technology Co., Ltd.

Address: Building 3, West Floor 9, SEG Technology Industrial Park,

North Huaqiang Road, Shenzhen City (518028)

Tel: 86-755-83769588

Fax: 86-755-83768150

Website: WWW.SZHYTECH.NET

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