Control Functions; Selecting Measuring Functions And Measuring Ranges; Automatic Measuring Range Selection (Auto-Ranging); Manual Measuring Range Selection - Gossen MetraWatt METRAHIT ENERGY TRMS System Multimeter Operating Instructions Manual

Control Functions

4 Control Functions

4.1 Selecting Measuring Functions and Measuring Ranges

The rotary switch is linked to an automatic socket blocking mech-
anism which only allows access to two jacks per function (excep-
tion: the voltage jack is open during current measurement, but a
visible red ring warns the user of possible incorrect connection).
Be certain to remove the appropriate plug from its respective jack
before switching to and from the "A" functions. The socket block-
ing 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 volt-
ages are applied in U > 35 V:
the high-imped-
ance voltage mea-
suring functions
(switch position V
or PQ), switching
PQ
to low-impedance
V
measuring func-
V~
tions (switch posi-
tion MHz, , conti-
nuity, temperature
or capacitance)
causes "HiVoLt" to
appear at the dis-
play and the
respective mea-
surement is dis-
abled. The mea-
suring function is not switched until dangerous contact voltage is
no longer applied to the input.
16
050.00
Hz
.
230 00
AC
V TRMS

MHz
m
V Temp
%
nS
RTD
hivolt
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).
Temp
TC

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
and energy measurement, see next page).
 
or scroll key (exceptions: power
GMC-I Messtechnik GmbH