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3. MEASUREMENT FUNCTIONS
3.1 AC/DC VOLTAGE
■ Select any measurement position with the rotary selector switch.
■ The instrument is automatically in AC/DC voltage measurement mode.
■ The voltage is continuously measured and is shown on the small display.
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 the voltage is indicated.
3.2 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.
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 will trigger an
audible signal instead.
The
to automatic voltage measurement.
■ Vpeak: External peak voltage or DC present at unit terminals.
■ dISt: Coefficient defined in the set-up menu (adjustable to 0.03 - 0.10 - 0.20 -
default value: 0.03).
■ 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 begins the measurement immediately. 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 a measurement is in progress.
WARNING: If the test voltage is considered to be dangerous (>120V),
the
value defined by the following threshold is detected during insulation
measurement, the measurement is stopped while the voltage is applied
to the instrument.
The
symbol will flash, and the voltage value will be indicated on the small
digital display.
26
symbol will flash for 2 seconds. Then, the device will return
Threshold: V peak ≥ dISt x Vn
symbol is displayed. If an external voltage higher than the
Megohmmeter Models 5050 & 5060
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