Peak Value Monitoring For Automatic And Manual Measuring Range Selection - Gossen MetraWatt METRAHIT ENERGY TRMS System Multimeter Operating Instructions Manual

The instrument is automatically returned to automatic 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
Manual mode active:
MAN / AUTO
utilized measuring range is fixed
Range switching sequence for:
60 mV*  600 mV*  6 V  60 V  600 V
V DC:
V AC/AC+DC: 600 mV*  6 V  60 V  600 V
Hz (V AC): 600 Hz  6 kHz  60 kHz  600 kHz
600 Hz  6 kHz  60 kHz  600 kHz  1 MHz
MHz
 or 
: 600 W  6 kW  60 kW  600 kW  6 MW  60 MW
600 mA  6 mA  60 mA  600 mA  6 A  10 A (16 A)
A:
Hz (A AC): 600 Hz  6 kHz  60 kHz  600 kHz
60 nF  600 nF  6 mF  60 mF  600 mF
F:
6 km  60 km
m:
MAN / AUTO Return to automatic measuring range selection
* Via manual measuring range selection only
"Intelligent" MAN Function
If a small measurement value occurs, the instrument can be
switched to a measuring range with higher resolution by pressing
the MAN / AUTO key.
Power and Energy Measurements
In the power meaurement function of Metrahit Energy, you can
choose between automatic measuring range selection or fixed
voltage and current measuring ranges.
In contrast to the other measuring functions, however, manual
measuring range selection is not possible in this case, as the
instrument cannot distinguish whether the voltage or current
measuring range is to be changed. The practical procedure is
therefore to start by applying the highest anticipated voltage and
GMC-I Messtechnik GmbH
Function
current values in the case of automatic measuring range selection
and then to lock in the resulting measuring ranges by pressing the
MAN / AUTO key. Locking is disabled by pressing the key once
again.
The voltage and current measuring ranges can be selected indi-
Display
vidually when the multimeter is remote-controlled via its IR inter-
face by using the USB X-TRA adapter (and the METRAwin10-Hit
MAN
software or control command via terminal program).
Mains and Harmonic Analysis
The measuring range for mains analysis (switch position PQ) is
specified in the menu (Set > MAinS > rAnGE).
MAN
The measuring range for harmonic analysis can be selected as a
fixed setting in the menu (Set > HArM > U.rAnGE and Set > HArM
> I.rAnGE, clamp factor is not taken into consideration!), or auto-
ranging can be activated.
—
4.1.3 Peak Value Monitoring
for Automatic and Manual Measuring Range Selection
The peak value is measured in addition to RMS measurement in
the V / A DC, AC and AC+D functions, as well as for power mea-
surement. If the peak value exceeds the valid range of the corre-
sponding measuring path, the instrument is switched up one
range, even if the displayed measured value has not yet reached
the threshold value. If the momentary range is manually selected,
(-)OL is displayed.
This assures that, in these functions, measurement is always per-
formed in the correct range (e.g. during measurement of a signal
with a high crest factor or measurement of the DC component of
a mixed signal with a large AC component).
Control Functions
17