Signalling; Meter - METREL Power Master MI 2892 Instruction Manual

MI 2892 Power Master

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).
Description of symbols and abbreviations used in METER screen is shown in table below.
Table 3.48: Instrument screen symbols and abbreviations
Sig1 True effective value signal voltage (U
specified carrier frequency (316.0 Hz in shown example) expressed in Volts or
316.0 Hz
percent of fundamental voltage
Sig2 True effective value signal voltage (U
specified carrier frequency (1060.0 Hz in shown example) expressed in Volts or
1060.0 Hz
percent of fundamental voltage
RMS True effective value of phase or phase to phase voltage U
U
31
Table 3.49: Keys in Signalling (METER) screen
HOLD
F1
RUN
METER
TREND
F4
TABLE
Figure 3.43: Signalling meter screen
)
Holds measurement on display. Hold clock time will be displayed in the
right top corner.
Runs held measurement.
Switches to METER view.
Switches to TREND view (available only during recording).
Switches to TABLE view (available only during recording).
, U , U , U
Sig1 Sig2 Sig3 Sig12
, U , U , U
Sig1 Sig2 Sig3 Sig12
61
Operating the instrument
, U , U ) for a user-
Sig23 Sig31
, U , U ) for a user-
Sig23 Sig31
(U , U , U , U , U
Rms 1 2 3 12 23
,