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6

TEMPERATURE (Model 72-10420A only

Range

Resolution

Accuracy

Overload protection

-40 ~ 150°C

1

℃

± (1%+3)

250V DC and AC

150 ~ 1000°C

± (1.5%+15)

SQUARE WAVE OUTPUT (Model 72-7770A only

Range

Function

 

OUT

~ 50Hz square wave

OPERATION
Voltage measurement (See Figure 1&2)

DC voltage measurement

For Model 72-7765A, the testing ranges are: 400mV, 4V, 40V and 250V.

For Model 72-10420A and 72-7770A, the testing ranges are: 200mV, 2000mV, 20V, 

200V and 250V.

To measure DC voltage, perform the following steps:

• 

Insert the red test probe into the VΩmA terminal and the black test probe into the 

COM terminal. 

• 

Turn the range selector to V range(s).

• 

Connect the test probes with the circuit being measured. The measured value will 

be shown on LCD.

AC voltage measurement 

For Model 72-7765A, the ranges are: 4V, 40V and 250V

For Model 72-10420A and 72-7770A, the ranges are: 200V and 250V.

Summary of Contents for 72-10420A

Page 1: ...1 Model 72 7765A 72 10420A 72 7770A Palm Size Digital Multimeter ...

Page 2: ...elector is on current resistance diode or continuity range When measuring current each single measurement should be shorter than 10 seconds For current values over 5A the wait period between each measurement must be longer than 15 minutes When a measurement has been completed disconnect the testing probes from the circuit under test Replace the batteries as soon as the low battery indicator appear...

Page 3: ...held with letter H shown on LCD Press it again to exit data hold operation 4 Backlight display button Press the blue button to turn on backlight 5 Range selector 6 COM input terminal 7 10A input terminal 8 Other input terminal OPERATING PARAMETERS Operating temperature 23ºC 5ºC Relative humidity 75 DC VOLTAGE Model Range Resolution Accuracy Overload Protection 72 7765A 400mV 0 1mV 0 8 3 250V AC 4V...

Page 4: ...quency response 40 400Hz Note At 10A range every measurement should be 10s the interval between measurements must be 15 minutes Model Range Resolution Accuracy Overload Protection 72 7765A 400μA 0 1μA 1 2 400mA 250V fast type fuse Φ5x20mm 4000μA 1μA 40mA 10μA 1 2 2 400mA 100μA 4A 1mA 1 5 5 10A 600V fast type fuse Φ6x25mm 10A 10mA 72 10420A 72 7770A 2000μA 0 1μA 0 5 2 200mA 250V fast type fuse Φ5x2...

Page 5: ...Resolution Accuracy Overload protection 1mV Displaying approximate forward voltage drop 250V DC and AC 0 1Ω 72 7765A Beeping if impedance 100Ω 1Ω Beeping if resistance 70Ω RESISTANCE Model Range Resolution Accuracy Overload protection 72 7765A 400Ω 0 1Ω 1 2 2 250V DC and AC 4kΩ 1Ω 1 2 40kΩ 10Ω 1 2 400kΩ 100Ω 1 2 4MΩ 1kΩ 1 2 2 40MΩ 10kΩ 1 5 5 72 10420A 72 7770A 200Ω 0 1Ω 0 8 5 2000Ω 1Ω 0 8 2 20kΩ 1...

Page 6: ...mV 4V 40V and 250V For Model 72 10420A and 72 7770A the testing ranges are 200mV 2000mV 20V 200V and 250V To measure DC voltage perform the following steps Insert the red test probe into the VΩmA terminal and the black test probe into the COM terminal Turn the range selector to V range s Connect the test probes with the circuit being measured The measured value will be shown on LCD AC voltage meas...

Page 7: ...put impedance of about 10MΩ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less Current measurement See Figure 3 4 WARNING Never attempt a current measurement where the voltage between either terminal and ground is greater than 60V DC current measurement Model 72 7765A testing range 4...

Page 8: ...t the testing probes from the circuit under test Resistance measurement See Figure 5 WARNING To avoid damages to the meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance Model 72 7765A testing ranges 400Ω 4kΩ 40kΩ 400kΩ 4MΩ and 40MΩ Model 72 10420A testing ranges 200Ω 2000Ω 20kΩ 200kΩ and 20MΩ Model 72 7770A testing r...

Page 9: ...drop should be within 0 5 0 8V To test diode perform the following steps Insert the red test probe into the VΩmA terminal and the black test probe into the COM terminal Turn the range selector to range For forward voltage drop readings on any semiconductor components connect the red test probe to the anode and the black test probe to the cathode of the components The measured value will be shown o...

Page 10: ...obe on the surface of or in the object to be measured The measured value will be shown on the display Notes The inside meter temperature will be automatically displayed when there is no temperature probe connected The point contact temperature probe attached to the meter can only measure temperature lower than 250 C When higher temperature measurement is needed please use other suitable temperatur...

Page 11: ...x W x L 130 x 73 5 x 35mm Weight including battery 156g BATTERY AND FUSE REPLACEMENT Replacing the battery Remove the test probes from the meter input terminals and turn the range selector to OFF position Unscrew and lift off the back cover Remove the old battery Replace with the new battery of same type Refit the back cover Replacing the fuse Remove the test probes from the meter input terminals ...

Page 12: ...s is required Do not dispose of these items with general household waste Separate for the treatment recovery and recycling of the materials used Waste batteries can be returned to any waste battery recycling point which are provided by most battery retailers Contact your local authority for details of the battery and WEEE recycling schemes available in your area Made in China PR2 9PP Man Rev 1 0 ...

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