Measurement Functions; Ac/Dc Voltage; Insulation Measurement - AEMC 5050 User Manual

4.1 AC/DC Voltage

• Select any measurement position with the rotary selector switch.
• The instrument is automatically in AC/DC voltage measurement mode.
•
Measurement is prohibited if an external voltage is present at the terminals before
pressing START/STOP. Similarly, if an interference voltage is detected during
measurement, the measurement is stopped and that voltage is indicated.

4.2 Insulation Measurement

As soon as one of the MΩ positions has been selected, the main display shows
"- - - - MΩ", and the small display indicates the voltage present at the device's "+"
and "–" terminals.
• Vpeak: External peak voltage or DC present at unit terminals.
• dISt: Coefficient defined in the set-up menu (adjustable to 0.03 - 0.10 -
• Vn: Test voltage chosen for insulation measurement.
If the external voltage present at the device terminals is less than the value defined
previously, then insulation measurement can proceed:
Pressing START immediately begins the measurement. The measurement value
is displayed on the main digital display and on the bargraph. An audible beep is
given out every 10 seconds to indicate that measurement is in progress.
Megohmmeter Models 5050/5060
0.561.8187

MEASUREMENT FUNCTIONS

The voltage is continuously measured and is shown on the small display.
WARNING: If the external voltage present at the device's terminals exceeds
the threshold shown below, pressing the yellow START/STOP button does
not bring about insulation measurement, but instead triggers an audible signal.
The symbol flashes for 2 seconds, then the device goes back to automatic
voltage measurement.
Threshold: V peak ≥ dISt x Vn
0.20 - default value: 0.03).
WARNING: If the test voltage is considered to be dangerous (> 120V), the
symbol is displayed. If, during insulation measurement, an external voltage
higher than the value defined by the following threshold is detected, the mea-
surement is stopped as long as the voltage is applied to the instrument.
www.
CHAPTER 4
.com
information@itm.
31