MI 2892 Power Master
Operating the instrument
61
3.13
Signalling
Mains signalling voltage, called “ripple control signal” in certain applications, is a burst of signals, often
applied at a non-harmonic frequency, that remotely control industrial equipment, revenue meters, and
other devices. Before observing signalling measurements, user should set-up signalling frequencies in
signalling setup menu (see section 3.21.4).
Results can be seen in a tabular (METER) or a graphical form (TREND) - which is active only while
GENERAL RECORDER is active. See section 3.14 for instructions how to start recording. In order to
understand meanings of particular parameter see section 5.1.9.
3.13.1
Meter
By entering SIGNALLING option from MEASUREMENTS submenu the SIGNALLING tabular screen is
shown (see figure below).
Figure 3.43: Signalling meter screen
Description of symbols and abbreviations used in METER screen is shown in table below.
Table 3.48: Instrument screen symbols and abbreviations
Sig1
316.0 Hz
True effective value signal voltage (U
Sig1
, U
Sig2
, U
Sig3
, U
Sig12
, U
Sig23
, U
Sig31
) for a user-
specified carrier frequency (316.0 Hz in shown example) expressed in Volts or
percent of fundamental voltage
Sig2
1060.0 Hz
True effective value signal voltage (U
Sig1
, U
Sig2
, U
Sig3
, U
Sig12
, U
Sig23
, U
Sig31
) for a user-
specified carrier frequency (1060.0 Hz in shown example) expressed in Volts or
percent of fundamental voltage
RMS
True effective value of phase or phase to phase voltage U
Rms
(U
1
, U
2
, U
3
, U
12
, U
23
,
U
31
)
Table 3.49: Keys in Signalling (METER) screen
HOLD
Holds measurement on display. Hold clock time will be displayed in the
right top corner.
RUN
Runs held measurement.
METER
Switches to METER view.
TREND
Switches to TREND view (available only during recording).
TABLE
Switches to TABLE view (available only during recording).
F1
F4
