MI 2892 Power Master
Operating the instrument
99
SIGN. 2 FREQUENCY
2
nd
observed signalling frequency.
DURATION
Duration of RMS record, which will be captured after treshold
value is reached.
THRESHOLD
Threshold value expressed in % of nominal voltage, which will
trigger recording of signalling event.
Table 3.93: Keys in Signalling setup screen
Enters or exits a submenu to set signalling frequency.
Toggles between given parameters.
Changes selected parameter.
Returns to the “MEASUREMENT SETUP” submenu.
3.21.5
Rapid voltage changes (RVC) setup
RVC is a quick transition in RMS voltage occurring between two steady-state conditions, and during
which the RMS voltage does not exceed the dip/swell thresholds.
An voltage is in a steady-state condition if all the immediately preceding 100/120 U
Rms(½)
values remain
within an set RVC threshold from the arithmetic mean of those 100/120 U
Rms(½)
(100 values for 50 Hz
nominal and 120 values for 60 Hz). The RVC threshold is set by the user according to the application, as a
percentage of U
Nom
, within 1 ÷ 6 %. See section 5.1.15 for details regarding RVC measurement. See
section 3.14 for instructions how to start recording.
Figure 3.69: RVC setup screen
Table 3.94: Description of RVC setup
Nominal voltage
Indication of type (L-N or L-L) and value of nominal voltage.
RVC THRESHOLD
RVC threshold value expressed in % of nominal voltage for steady
state voltage detection.
RVC HYSTERESIS
RVC hysteresis value expressed in % of RVC threshold.
Table 3.95: Keys in RVC setup screen
Toggles between given parameters.
ENTER
