User Manual

18 GMC-I Gossen-Metrawatt GmbH
Control Functions
4 Control Functions
4.1 Selecting Measuring Functions and Measuring Ranges
The rotary switch is linked to the automatic socket blocking
mechanism, which only allows access to two connector jacks for
each function. Be certain to remove the appropriate plug from its
respective jack before switching to and from the “A” functions.
The socket blocking mechanism prevents the user from inadvert-
ently turning the selector switch to impermissible functions after
the measurement cables have been plugged in to the instrument.
4.1.1 Automatic Range Selection
The multimeter is equipped with auto-ranging for all measuring
functions, except for temperature measurement, diode and
continuity testing, and the MHz measuring function. Auto-ranging
is active as soon as the instrument is switched on. The instrument
automatically selects the measuring range which allows for
highest possible resolution of the applied quantity. When the
instrument is switched to frequency measurement, the previously
selected voltage measuring range remains active.
The Auto-Ranging Function
The multimeter is switched automatically to the next higher range
at ±(11999 d + 1 d → 01200 d), and to the next lower range at
±(01100 d - 1 d → 10990 d).
Exception, capacitance measurement:
The multimeter is switched automatically to the next higher range
at ±(1199 d + 1 d → 0120 d), and to the next lower range at
±(0110 d - 1 d → 1099 d).
4.1.2 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can be
selected manually in accordance with the following table by
pressing the MAN / AUTO button.
The desired measuring range can then be selected with the
 or
 scroll key.
The instrument is automatically returned to range selection when
the MAN / AUTO key is pressed, the rotary switch is activated or the
instrument is switched off and back on again.
Overview: Auto-Ranging and Manual Range Selection
* Via manual measuring range selection only
Function Display
MAN / AUTO
Manual mode active:
utilized measuring range is fixed
MAN
 or 
Range switching sequence for:
V: 100 mV*
↔ 1 V ↔ 10 V ↔ 100 V ↔ 1000 V
Hz: 100 Hz
↔ 1 kHz ↔ 10 kHz ↔ 100 kHz
Ω: 100 Ω
↔ 1 kΩ ↔ 10 kΩ ↔ 100 kΩ ↔ 1 MΩ ↔
10 MΩ ↔ 40 MΩ
A: METRAHIT⏐X-
TRA⏐OUTDOOR: 100 μ A ↔ 1 mA ↔ 10 mA
↔
100 mA ↔ 1 A ↔ 10 A (16 A)
METRAHIT⏐T
ECH:
10 mA
↔ 100 mA ↔ 1 A ↔ 10 A (16 A)
METRAHIT⏐P
RO: 1A ↔ 10 A (16 A)
A:METRAHIT⏐B
ASE and METRAHIT⏐TECH:
see chapter 5.7.3 ff
F: METRAHIT⏐X-
TRA⏐OUTDOOR and METRAHIT⏐TECH:
10 nF ↔ 100 nF ↔ 1 μ F ↔ 10 μ F ↔ 100 μ F ↔ 1000 μ F
MAN
MAN / AUTO Return to automatic measuring range selection —