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meter reading. 

5. Reverse the probe polarity by switching probe position. Note this reading. 

6. The diode or junction can be evaluated as follows: 

A. If one reading shows a value and the other reading shows OL, the diode is good. 

B. If both readings show OL, the device is open. 

C. If both readings are very small or zero, the device is shorted. 

NOTE: 

The value indicated in the display during the diode check is the forward voltage.

 

CAPACITANCE MEASUREMENT 
 

WARNING: 

To avoid electric shock, discharge the capacitor under test before measuring.

 

1.

 

Set the function switch to the 

CAP

 capacitance position. 

2.

 

Insert the black test lead banana plug into the negative 

COM

 jack and the red test lead banana 

plug into the 

CAP

 positive jack. 

3.

 

Touch the test probe tips across the part under test. 

4.

 

Read the capacitance value in the display. 

5.

 

The display will indicate the proper decimal point and value. 

Note

: For very large values of capacitance measurement time can be several minutes before the 

final reading stabilizes. The bar graph is disabled in capacitance measurement mode. The LCD 
displays

 DIS. C

 .Discharging through the chip is quite slow. We recommend the user to discharge the 

capacitor with some other apparatus. 

FREQUENCY MEASUREMENT 

1. Set the function switch to the Hz position. 

2. Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana 
plug into the positive Hz jack. 

3. Touch the test probe tips to the circuit under test. 

4.

 

Read the frequency in the display. The digital reading will indicate the proper decimal point, 

symbols (kHz, MHz) and value. 

TEMPERATURE MEASUREMENT 

1.

 

Set the function switch to the Type K 

o

F or 

o

C position. 

2.

 

Insert the Temperature Probe into the input jacks, making sure to observe the correct polarity. 

3.

 

Press the MODE button until “

o

F or 

o

C” appears in the display. 

4.

 

Touch the Temperature Probe head to the part whose temperature you wish to measure.  

Keep the probe touching the part under test until the reading stabilizes (about 30 seconds). 

5.

 

Read the temperature in the display. 

Summary of Contents for AX-155

Page 1: ...TRUE RMS AUTORANGING DIGITAL MULTIMETER Model AX 155 INSTRUCTION MANUAL...

Page 2: ...ies recommend the use of fused test leads when measuring voltage on high energy systems Replacement fuses must be of the correct type and rating The instrument must not be used if any part of it is da...

Page 3: ...turn the range knob from the OFF position to any measurement range Note For best battery life ALWAYS turn the function switch to the OFF position when the meter is not in use This meter has Auto OFF...

Page 4: ...o normal AUTO measurement mode hold down the MAX MIN button for 2 seconds Peak Hold button The Peak Hold function captures the peak AC or DC voltage or current The meter can capture negative or positi...

Page 5: ...g into the negative COM jack 2 For current measurements up to 4000uA DC set the function switch to the uA position and insert the red test lead banana plug into the uA jack 3 For current measurements...

Page 6: ...til appears in the display 4 Touch the test probe tips across the circuit or part under test It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with...

Page 7: ...citance measurement time can be several minutes before the final reading stabilizes The bar graph is disabled in capacitance measurement mode The LCD displays DIS C Discharging through the chip is qui...

Page 8: ...value Average responding multimeters are calibrated to read correctly only on sine waves and they will read inaccurately on non sine wave or distorted signals True rms meters read accurately on either...

Page 9: ...0mV 0 1mV 0 8 of rdg 3 digits 4 000V 1mV 40 00V 10mV 400 0V 100mV 1000V 1V 1 2 of rdg 5 digits Input Impedance 7 8M AC Response True RMS 50 Hz 60Hz Maximum Input 1000V dc or 1000V ac rms DC Current A...

Page 10: ...rms on mA 10A ac rms on 10A range Resistance Auto ranging Range Resolution Accuracy 400 0 0 1 0 8 of rdg 5 digits 4 000k 1 0 8 of rdg 2 digits 40 00k 10 400 0k 100 4 000M 1k 2 5 of rdg 8digits 40 00M...

Page 11: ...Resolution Accuracy 20 o C 760 o C 1 o C 3 of rdg 5dgts 4 o F 1400 o F 1 o F 3 of rdg 9dgts Sensor Type K Thermocouple Overload protection 1000V dc or ac rms Diode Test Test current Resolution Accurac...

Page 12: ...sing a Phillips head screwdriver 3 Insert the battery into battery holder observing the correct polarity 4 Put the battery cover back in place Secure with the two screws NOTE If your meter does not wo...

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