Using The Leads; Ac/Dc Voltage Measurement - AEMC 6550 User Manual

4.2 Using the Leads

Specific leads are supplied with the instrument. To use them, attach either the test probes or alligator clips
(supplied with the instrument).
NOTE: These accessories have hand guards. For safety reasons, the user's hands must always be behind
the hand guard.
Always keep hands behind this protective guard:
• Voltages ≤1000V
• Insulation using a test voltage ≤ 5000V
Measurements of voltages ≥1000V on supply lines should be made using the test probes only, with the user's
hands behind the hand guard on the lead.
WARNING: The leads with large clips (automobile battery charger type) proposed as accessories should
not be used for line voltage measurements because their jaws are not insulated.

4.3 AC/DC Voltage Measurement

Turning the switch to any insulation measurement position (V-FIXED, V-VAR, V-RAMP, or V-STEP) sets the
instrument to AC/DC voltage measurement. The voltage between the input terminals is measured at all times
and indicated as RMS value on the display unit: Input Voltage. Switching between AC and DC mode is auto-
matic.
In the case of an AC signal, the instrument measures the frequency. It also measures the residual DC current
between the terminals of the instrument. This measurement is used to evaluate its impact on the insulation
measurement about to be made.
The insulation measurements cannot be started if there is an excessively high external voltage (>0.4VN where
VN is the test voltage, with a maximum of 1000V
Megohmmeter Models 6550/6555
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• On insulation measurements with a test voltage ≥ 5000V
) on the terminals.
AC
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15 kV max
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