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Gossen Metrawatt METRAHIT 30M Manual

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GMC-I Messtechnik GmbH 7
GB
3 Selecting Measuring Functions and Ranges
3.1 Automatic Measuring Range Selection
The multimeter is equipped with automatic measuring range
selection. This automatic feature is active as soon as the
instrument is switched on, and automatically selects the
measuring range which provides optimum resolution.
The voltage measuring range selected in the V AC selector
switch position remains active after switching to frequency
measurement “Hz”, and automatic measuring range selection
is disabled. We thus recommend the selection of a suitable
voltage measuring range in the V AC selector switch position
before switching to frequency measurement.
The instrument selects the measuring range automatically for
the following measured quantities:
3.2 Manual Measuring Range Selection
(Quick Measurements)
Measurements performed using a suitable fixed measuring
range are executed more quickly than those which utilize auto-
matic range selection. Automatic range selection can be deac-
tivated, and ranges can be manually selected according to the
following table.
The manual mode is deactivated by pressing and holding the
MAN| AUTO key (approx. 1 s), by activating the rotary switch or by
switching the instrument off and back on again.
4 Digital Display (LCD)
The measurement value appears at the digital display with cor-
rect decimal place and plus or minus sign. The selected unit of
measure and the type of current are displayed as well. A minus
sign appears in front of the numeric value for the measurement
of zero-frequency quantities, if the positive pole of the mea-
sured quantity has been connected to the “–V” input.
If the measuring range upper limit of 1,250,000 is exceeded for
measured quantities V and mA, “0L” is displayed (overload).
The digital display is refreshed every 0.5 to 2 s (see “Display
Update” on page 21).
Measured Quantity
Reso-
lution
Switching to the Next
Highest Range
at ±(... d + 1 d)
Switching to the Next
Lowest Range
at ±(... d –1 d)
V, Ω, Hz 6½ 1100000 100000
V , mA 5½ — 100000
MAN/
AUTO
Function
Acknowledge
Display
Acoust.
Signal
Brief
Manual Mode Active:
selected measuring range is frozen
MAN 1 x
Brief
Switching sequence for:
V:
100 mV
→
1V
→
10 V
→
100 V
→
600 V
→
100 mV
→
...
mA: 100 μA → 1mA→ 10 mA → 100 mA → 100 μA...
Ω: 100 Ω→ 1kΩ→ 10 kΩ→ 100 kΩ→ 1MΩ→
10 MΩ ... → 100 Ω
MAN 1 x
Long Return to Automatic Range Selection — 2 x
… 7 …


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