Operation Manual

6 GMC-I Messtechnik GmbH
3.4 Checking Device Functions
The METRISO 5024 functions as a voltmeter when the toggle switch
(4) is in the neutral position:
Ð The voltmeter function can be checked by applying a voltage to
both test probes (1 and 8), e.g. line voltage from a mains outlet.
The rotary switch must be set to any of positions 100 V, 250 V or
500 V.
Ð When the toggle switch (4) is in either the Ω or MΩ position, the
batteries are activated and the METRISO 5024 remains in the
selected function as long as the toggle switch is activated.
Measurements in the Ω and MΩ ranges are evaluated by means
of the green LED (10), the beeper and the pointer.
Ð The ohmmeter function – rotary switch in the Ω position and toggle
switch in the Ω position – can be tested by short-circuiting the
two test probes (1 and 8): 0 Ω appears at the display,
continuous acoustic signal from the beeper.
Avoid open test probes (resistance approaching ∞), (pointer
oscillates, periodic sequence of acoustic signals from the
beeper).
Ð The insulation measuring function – rotary switch in the xxx V
position and toggle switch in the MΩ position – can be tested
with the help of the two limit values: Short-circuit the two test
probes (1 and 8): Pointer oscillates, periodic sequence of
acoustic signals from the beeper, green LED blinks; separate the
test probes: ∞ appears at the display, continuous acoustic signal
from the beeper, green LED lights up.
Display accuracy can be tested using the ISO Calibrator 1 (article no.
M662A) as an accessory by connecting it to the low or high value
resistor.