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HOLD button 
 

The HOLD function allows the meter to "freeze" a measurement for later reference. 

1.

 

Press the HOLD button to “freeze” the reading on the indicator. The “HOLD” message will be 

appear in the display. 

2.

 

Press the HOLD button again to return to normal operation. 

 

BACKLIGHT button 

1.

 

Press the BACKLIGHT button to switch on the display light. 

2.

 

Press BACKLIGHT button again to exit the light mode. 

 

MAX/MIN button 

The MAX/MIN function allows the meter to capture the highest or lowest measurement for later 
reference. 

1. Press the MAX/MIN button to begin measurement. The indicator “MAX” or MIN will appear in the 
display. 

2. If the “MAX MIN” messages are flashing, the instrument is in MAX/MIN mode but not recording, 
press the MAX/MIN button to select a mode. 

3. To return to 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 positive peaks as fast as 1 millisecond in duration.  

Turn the function switch to the A or V position. 

1.

 

Use the 

MODE

 button to select AC or DC. 

2.

 

Allow time for the display to stabilize. 

3.

 

Press and Hold the 

PEAK

 button until “

CAL

” appears in the display. This procedure will zero the 

range selected. 

4.

 

Press the 

PEAK

 button, 

Pmax

 will display. 

5.

 

The display will update each time a higher positive peak occurs. 

6.

 

Press the 

PEAK

 button again, 

Pmin

 will display. The display will now update and indicate the 

lowest negative peak. 

7.

 

To return to normal operation, press and hold the 

PEAK

 button until the 

Pmin

 or 

Pmax

 indicator 

switches off. 

Note

: If the Function switch position is changed after a calibration the Peak Hold calibration must 

be repeated for the new function selected. 

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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