Operation; Auto-Ranging; Safety Check - Voltage Test; Insulation Resistance Testing (Mω Range) - AEMC 6503 User Manual

4.1

Auto-ranging

How it works: When the pointer reaches approximately 90% of the
full scale length, the auto-range is triggered, the red auto-range (x10)
LED lights up. The pointer goes back to the beginning of the scale
and resumes its travel. The readings should be multiplied by 10 when
the x10 LED is on.
4.2 Safety Check - Voltage Test
Before measuring insulation resistance, confirm that the sample is
fully discharged (particularly in dielectric and capacitance samples)
and that the sample is not connected to an energized circuit.
To perform the voltage test, set the range selection to V MΩ (Model
6501) or 500V MΩ (Model 6503), connect and read on the red
voltage scale (600V
a DC circuit, the pointer will deflect but the measurement may be
inaccurate.
4.3 Insulation Resistance Testing (MΩ Range)
After checking for a live circuit (see safety check), select the test volt-
age and connect the megohmmeter. Several connection examples
are illustrated further. Crank the handle until the Amber LED (Model
6501) or Green LED (Model 6503) on the upper right-hand side
lights, ensuring that the selected test voltage has been reached.
12
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CHAPTER 4

OPERATION

max). DO NOT CRANK. If measuring on
AC
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