Voltage; Resistance; Frequency; Capacitance - Amprobe PM55A User Manual

Voltage

With Auto on the LCD, press the SELECT button 3 times to select V ac function. The meter displays
LoZBV when it is ready.This function is auto-ranging.
With Auto on the LCD, press the SELECT button 4 times to select V dc. The meter displays LoZ V
when it is ready. This function is auto-ranging.

Resistance

With Auto on the LCD, press the SELECT button 5 times to select resistance function, The meter
displays MΩ when it is ready. This function is auto-ranging.

Frequency

With Auto on the LCD, press the SELECT button 6 times to select frequency function, The meter
displays Hz when it is ready. This function is auto-ranging.

Capacitance

With Auto on the LCD, press the SELECT button 7 times to select capacitance function, The meter
displays nF when it is ready. This function is auto-ranging.
Return to Auto
Press the SELECT button 8 times to return to AutoTect test mode.
V dc, V ac, and Line-Level Hz
Turn the rotary switch to the V position to select common impedance
Hi-Z voltage measurements. V dc is the default function. Press SELECT button momentarily to select
V ac. The AC annunciator B appears. Press momentarily again to select the Line-Level Hz function.
Line-Level Hz input sensitivity varies automatically with V ac range selected when Line-Level Hz is
selected. Measuring the signal in V ac function WHILE selecting Line-Level Hz function in that V ac
range automatically sets the most appropriate sensitivity for higher voltage applications. This can
avoid electrical noises as in 110/220 V line voltage applications. For example, If the reading shows
zero due to insufficient signal levels, select Line-Level Hz function BEFORE making measurements (at
6 V ac range) will set the highest sensitivity.

Diode

Turn the rotary selector to the GR /600 Ω position. Diode test is the default function. The reading
shows the approximate voltage drop across the test leads. Normal forward voltage drop (forward
biased) for a good silicon diode is between 0.400 V to 0.900 V. A reading higher than that indicates a
leaky diode (defective). A zero reading indicates a shorted diode (defective), and the meter will give a
long beep as continuity warning. OL indicates an open diode (defective). Reverse the test leads
connections (reverse biased) across the diode. The digital display shows OL if the diode is good. Any
other readings indicate the diode is resistive or shorted (defective).
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