50
GMC-I Messtechnik GmbH
Measurements: V/Hz/dB – PQ/
– MHz/% –
/nS/R
SL
– /
– Temp –
/m – W/Wh – A/Hz/thd
Measurement of Active, Apparent and Reactive Energy – Wh, VAh, VArh
The instrument can be switched back and forth between energy
and power measurement by pressing the
FUNC | ENTER
key.
Energy measurement begins as soon as power or energy measu-
rement has been started.
Measured values resulting from power or energy measurement
can be reset by pressing and holding the
ZERO | ESC
key for longer
than 1 second. This applies to the MEAN and MAX displays as well
(mean power values and maximum mean power values).
Energy measurement is an integration of measured power over a
period of time: If integration duration is long enough (negligible
settling times), accuracy of the energy measurement corresponds
to the measuring accuracy of the power measurement on which it
is based.
Note
Due to the fact that invalid values occur briefly during mea-
suring range switching for current or voltage during power
measurement, it’s advisable to lock into the largest measur-
ing range during energy measurement in the event of fre-
quent range changes.
Mean Power Values
Mean power consumption can be displayed by pressing the
DATA/
MIN/MAX
key, which can be reset after an adjustable observation
period that can be configured in the menu under SEt >
dEMAnd tiME. The observation period is selected synchronous to
clock time, so that the mean value generating period for the first
value is usually shorter than the selected observation period.
Example: demand time = 15 min., start time for first period: 16:36
=> the first value is generated at 16:45, the second at 17:00 etc.
If the auto-send function has been activated and energy measure-
ment has been selected, mean power consumption values are
transmitted after this point in time, if the dEMAnd option has been
selected in the menu under Set > Energy > Store.
Maximum Mean Value for Power Consumption
The maximum mean power consumption value during the obser-
vation period can be read out with date and ending time of the
observation period by repeatedly pressing the
DATA/MIN/MAX
key
(dEMAnd tiME parameter: see page 68).