User Manual

24 GMC-I Messtechnik GmbH
Control Functions
4.5.1 Rapid Momentary Value Acquisition for U DC and I DC
Rapid momentary value acquisition is only activated during
memory mode operation in the U DC and I DC functions, and only
after selecting a sampling period of 0.5, 1, 2, 5, 10, 20 or 50 ms:
All trigger and hysteresis functions are available, although the
momentary value is acquired with a separate measuring circuit.
This allows for the recording of the waveshapes of low-frequency
signals with reduced resolution and accuracy (typically < 1% of the
measuring range under reference conditions, not specified).
Roughly 300,000 measured values can be saved in this mode.
Values of up to about 1.9 x Umax or Imax are recorded (with fixed
range, range-dependent fluctuations), and thus the range limit
can be exceeded by approximately 90%.
Note
The ZERO/ΔREL function is not taken into consideration for
rapid momentary value acquisition!
4.5.2 Power and Energy Measurement in the Memory Mode
The value selected for the SEt > EnErGY > StorE menu parameter
specifies which values from power and energy measurements will
be saved during memory mode operation:
• SEt > EnErGY > StorE = normal (default setting):
Momentary values for current, voltage, active, reactive and
apparent power, as well as power factor, are acquired and
saved to memory at the selected sampling rate (at least 0.5 s).
• SEt > EnErGY > StorE = demand:
The instrument only saves mean power values at the end of the
dEMAnd tiME observation period
(see section 6.4.4, “dEMAnd tiME” parameter).
• SEt > EnErGY > StorE = all:
Momentary values are saved at the selected sampling rate and
mean power values are saved at the end of each dEMAnd
tiME observation period
(see section 6.4.4, “dEMAnd tiME” parameter).
Ð Set the dEMAnd tiME interval for memory mode operation
before you start recording.