10 GMC-I Gossen-Metrawatt GmbH
3 Selection of Measurement Functions and
Measuring Ranges
The rotary switch is coupled to the automatic socket
blocking device, which makes two jacks available for each
function. Before switching to the “mA” or “A” functions, or
out off the “mA” or “A” functions, be certain that the plug
has been removed from the corresponding jack. The
socket blocking device prevents inadvertent switching to
disallowed functions when a plug connection exists.
3.1 Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring
range selection for all measuring ranges, except for tem-
perature measurement, as well as diode and continuity
testing. This automatic feature is active as soon as the
instrument is switched on. The instrument automatically
selects the measuring range which provides optimum res-
olution for the measured quantity.
The previously selected voltage measuring range remains
active after switching the instrument to frequency mea-
surement or events counting.
The instrument is automatically switched to the next high-
est or next lowest measuring range for the following mea-
sured quantities:
1)
280 digits apply when switching from 100 kHz to 3 kHz
3.2 Manual Measuring Range Selection
The automatic measuring range feature can be deactivated
and the ranges can be manually selected and prescribed
according to the following table.
The manual mode is deactivated by pressing and holding
the MAN|AUTO key (approx. 1s), by activating the rotary
switch or by switching the instrument off and back on again.
Measuring Range
Reso-
lution
Switching to the
Next Highest
Range
at ±(... D + 1 D)
Switching to the Next
Lowest Range
1)
at ±(... D –1 D)
V, V, A,
mA , A , Ω, 30
mF, Hz
4 ¾ 31 000 2 800
3 nF ... 3 mF 3 ¾ 3 100 280
⇓
MAN/
AUTO
Function
Acknowledge
Dis-
play
Acoust.
Signal
Brief
Manual Mode Active:
selected measuring range is fixed
MAN 1 x
Brief
Switching Sequence for:
V: 300 mV → 3V→ 30 V → 300 V → 1000 V →
300 mV → ...
dB: same switching sequence as for V
mA : 300 μA → 3mA→ 30 mA → 300 mA → 300 μA ...
A: 3A→ 10 A → 3 A ...
Ω:30MΩ→ 300 Ω→ 3kΩ→ 30 kΩ→ 300kΩ→
3MΩ→ 30 MΩ ...
F: 3nF→ 30 nF → 300 nF → 3 μF → 30 μF →
300 μF → 3000 μF → 30 000 μF → 3 nF ...
Hz: 300 Hz → 3kHz→ 100 kHz → 300 Hz ...
MAN 1 x
Long Return to Automatic Range Selection — 2 x
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