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Tenma 72-9375, Operating Manual

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Tenma 72-9375 Operating Manual Download Page 8

11

7

No.

Symbol

Meaning

AC

Indicator for AC voltage or 
current.
The displayed value is the mean
value.

Indicates negative reading. 

CHARGE  

Charge indicator

AUTO

The Meter is in the auto range
mode in which the Meter 
automatically selects the range
with the best resolution.

Data hold is active 

The

mode displays the

present value minus the stored 
value

The power is low.

Warning: To avoid false 

readings, which could lead to 
possible electric shock or 
personal injury, replace the 
battery as soon as the battery
indicator appears.

V

Unit voltage (when charging is on)

Continuity buzzer

Test of diode 

1

2

3

4

5

6

7

8

9

10

,k ,

M

:

:

k

M :

Ohm (unit of resistance)
Kilohm (1 x 10

3

or 1000 

ohms)
Megohm (1 x 10

6

 or 

1,000,000 ohms)

72-9375: OPERATING MANUAL

Summary of Contents for 72-9375

Page 1: ...110V P N 110401102691 72 9375 ...

Page 2: ...es Continuity Capacitance 10 C Frequency Measurement 14 D AC DC Current Measurement 15 E Power Charging 16 Operation of Hold Mode 17 The Use of Relative Value Mode 18 The RESET Button 19 The SELECT Button 19 Sleep Mode 19 General Specifications 19 Accuracy Specifications 20 A AC Voltage 20 B DC Voltage 21 C Resistance 21 D Diode Continuity 21 E Capacitance Test 22 F Frequency Test 22 G AC Current ...

Page 3: ...old and continuity it is equipped with capacitance test frequency test relative mode and this meter is equipped with the flexibility of charging through 110V AC or 12 36 AC DC or built in solar energy cell With this design the Meter does not require a conventional battery which reduces waste and cost associated with disposable batteries PACKAGE CONTENTS Open the package case and take out the Meter...

Page 4: ...case or part of the case is removed Look for cracks or missing plastic Inspect the insulation around the connectors z Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter z When using the test leads keep your fingers behind the finger guards z Do ...

Page 5: ...placement parts z The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident z Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing No abrasives or solvents should be used on or in the meter z Turn the Meter off when it is not in use z Do not use or store the Meter in an environment of high temperature humid...

Page 6: ...on ļ Input Terminals Ľ Relative Mode RESET Button Rotary Switch Below table indicated for information about the rotary switch positions Rotary Switch Position Function OFF Power is turned off V AC DC voltage measurement ȍ Resistance measurement Diode Test Continuity test ȍ Capacitance test Hz Frequency Test μA mA A AC or DC Current Measurement CHARGE 110V MAX 72 9375 OPERATING MANUAL ...

Page 7: ...t Hz and CHARGE Press RESET to enter and exit the mode in any measuring mode except in frequency and charge mode Meter will beep V A Switches between AC and DC voltage current DC is default SELECT Switches between resistance diode continuity and capacitance measurements Resistance is default Any rotary switch position Press to enter and exit the Hold mode in any mode Display Symbols see figure 2 7...

Page 8: ...ution Data hold is active The mode displays the present value minus the stored value The power is low Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears V Unit voltage when charging is on Continuity buzzer Test of diode 1 2 3 4 5 6 7 8 9 10 k M k M Ohm unit of resistance Kilohm 1 x 10 3 or 1000...

Page 9: ...10 6 or1 000 000 hertz V mV V mV Volts unit of voltage Millivolt 1 x 10 3 or 0 001 volts A mA µA A mA µA Amperes amps The unit of current Milliamp 1 x 10 3 or 0 001 amperes Microamp 1 x 10 6 or 0 000001 amperes A AC DC Voltage Measurement see figure 3 Warning To avoid personal injury or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000VDC 750VAC RM...

Page 10: ...edance of 10Mȍ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kȍ the error is negligible 0 1 or less z When AC voltage measurement has been completed disconnect the connection between the test leads and the circuit under test DC voltage measurement The DC Voltage ranges are 400 0mV 4 000V 40 00V 400 0V and 1000V To me...

Page 11: ...uit under test B Measuring Resistance Diodes Continuity Capacitance Warning To avoid personal injury never attempt to input over 60V in DC or 30V rms in AC 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 diodes continuity capacitance For testing capacitance use the DC Voltage function to c...

Page 12: ...value function button RESET to automatically subtract the value measured when the testing leads are short circuited from the reading z For high resistance measurement 1Mȍ it is normal taking several seconds to obtain a stable reading z If ȍ reading with shorted test leads is not 0 5ȍ check for loose test leads incorrect function selection or enabled Data Hold function z The LCD displays OL indicat...

Page 13: ...on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note z In a circuit a good diode should still produce a forward voltage drop reading of 0 5V to 0 8V however the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips z Connect the test leads to the proper terminals as listed...

Page 14: ... indicating the resistance of the circuit being tested is higher than 400 The buzzer sounds if the RESET SELECT or is pressed When continuity testing has been completed disconnect the connection between the test leads and the circuit under test Capacitance Measurement see figure 7 The Meter s capacitance ranges are 40 00nF 400 0nF 4 000μF 40 00μF and 100 0μF To measure capacitance connect the Mete...

Page 15: ...sting a capacitor value which is higher than 10μF range When capacitance measurement has been completed disconnect the connection between the testing leads and the circuit under test C Frequency Measurement see figure 8 Warning To avoid personal injury please do not attempt to input frequency voltage being tested higher than 30V The measurement ranges are from 10Hz to 10MHz To measure frequency co...

Page 16: ...When the testing leads are connected to the current terminals do not parallel them across any circuit The current measurement has 3 measurement positions on the rotary switch A A and mA The A has a 400 0 A and 4000 A range with auto ranging the mA has a 40 00mA and 400 0mA range with auto ranging A position has a 4 000A and 10 00A range with auto ranging To measure current do the following 1 Turn ...

Page 17: ...or safety sake the measuring time for high current should be less than 10 seconds for each measurement and the interval time between 2 measurements should be greater than 15 minutes z When current measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter E Power Charging see ...

Page 18: ...36V power supply respectively 4 CHARGE shows on the display 5 The charging time is at least 30 mins 6 The continuous working time is 90 mins Charge by Solar Power Automatic charging can be completed through the built in solar cell and a steady light source preferably sunlight Remarks The display indicates 0 7V as the rated charge voltage us as a comparative value The LCD will turn off when the pow...

Page 19: ... and the present measurement value is 22 0V the reading would be 2 0V If a new measurement value is equal to the stored value then display 0 0V To enter or exit mode Use rotary switch to select the measurement function before selecting RESET If measurement functions change manually after RESET is selected the Meter exits the mode Press RESET to enter mode and the present measurement range is locke...

Page 20: ...press any button for about 30 minutes The Meter can be activated by turning the rotary switch or pressing any button To disable the Sleep Mode press SELECT while turning on the Meter General Specifications Maximum Voltage between any Input Terminals and ground Refer to different range input protection voltage Fuse protection 500mA 250V fast of A mA terminal type 5x20mm Fuse protection 10A 250V fas...

Page 21: ...ing holster and battery Safety Compliances IEC61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard Certification Accuracy Specifications Accuracy a reading b digits guarantee for 1 year Operating temperature 23 5 Relative humidity 75 Temperature coefficient 0 1 x specified accuracy 1 A AC Voltage Range Resolution Accuracy Overload Protection 4V 1mV 40V 10mV 400V 100mV 1 5 750...

Page 22: ...uracy Overload Protection 400 0 1 1 2 2 4k 1 40k 10 400k 100 1 2 4M 1k 1 2 2 40M 10k 1 5 2 600Vp Remarks Open circuit voltage approx 0 45V D Diode Continuity Range Resolution Overload Protection 1mV 0 1 600Vp Remarks At Range Open circuit voltage approximate 1 48V At Range Open circuit voltage approximate 0 45V The buzzer does not sound when the resistance value is 100 The circuit is disconnected ...

Page 23: ...verload Protection 10Hz 10MHz 0 01Hz 10kHz 0 1 3 600Vp Remarks Minimum input amplitude when 1MHz 300mV when 1MHz 600mV Maximum input amplitude 30V rms G AC Current Range Overload Protection 400 A 0 1 A 4000 A 1 A 1 5 5 40mA 10 A 400mA 0 1mA 2 5 Fuse 500mA 250V fast type 5 20mm 4A 1mA 10A 10mA 2 5 5 Fuse 10A 250V fast type 5 20mm Remarks Frequency response 40Hz 400Hz At 10A Range For continuous mea...

Page 24: ...your Meter unless you are qualified to do so and have the relevant calibration performance test and service information To avoid electrical shock or damage to the Meter do not get water inside the case A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Make sure the power is off and clean the terminals with a small brush or swab with ...

Page 25: ...rews from the case bottom and separate the case top from the case bottom 5 Remove the fuse by gently prying one end loose and remove the fuse from its bracket 6 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 10A 250V fast type ij5x20 mm Fuse 2 500mA 250V fast type ij5x20 mm 7 Rejoin the case bottom and ...

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