User Manual
16 GMC-I Messtechnik GmbH
Control Functions
4 Control Functions
4.1 Selecting Measuring Functions and Measuring Ranges
The rotary switch is linked to an automatic socket blocking
mechanism which only allows access to two jacks per function
(exception: the voltage jack is open during current measurement,
but a visible red ring warns the user of possible incorrect connec-
tion). Be certain to remove the appropriate plug from its respec-
tive jack before switching to and from the “A” functions. The
socket blocking mechanism prevents the user from inadvertently
turning the selector switch to impermissible functions after the
measurement cables have been plugged in to the instrument.
Presence of Dangerous Contact Voltages
If dangerous volta-
ges are applied in
the high-impe-
dance voltage
measuring func-
tions (switch posi-
tion V or PQ), swit-
ching to low-impe-
dance measuring
functions (switch
position MHz, Ω,
continuity, tempe-
rature or capaci-
tance) causes
“HiVoLt” to appear
at the display and
the respective
measurement is
disabled. The
measuring function is not switched until dangerous contact vol-
tage is no longer applied to the input.
If the instrument switches itself off in the event that hazardous
contact voltage is applied (during memory mode operation with
large sampling period), the high-voltage warning symbol remains
visible at the display.
4.1.1 Automatic Measuring Range Selection (auto-ranging)
The multimeter is equipped with auto-ranging for most measuring
functions. 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 measure-
ment, the previously selected voltage measuring range remains
active.
AUTO-Range Function
The multimeter is switched automatically to the next higher range
at ±(61000 d + 1 d → 06100 d) and to the next lower range at
±(05400 d - 1 d → 53999 d).
Exceptions: capacitance and cable length measurement
The multimeter is switched automatically to the next higher range
at ±(6100 d + 1 d → 00 610 d) and to the next lower range at
±(0540 d → 5399 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 pres-
sing the MAN / AUTO button. The desired measuring range can
then be selected with the
or scroll key (exceptions: power
and energy measurement).
230
.
00
V
050
.
00
AC
TRMS
Hz
U > 35 V:
V~
V
V
PQ
MHz
%
Ω
Temp
TC
Temp
RTD
nS
m
hivolt