20-1
Chapter 20
Mains Signaling
Introduction
Mains Signaling is a function available in
Fluke 435-II and 437-II
. Power distribution
systems often carry control signals to switch appliances on and off remotely (also known
as ripple control). These control signals have a frequency that is higher than the normal
50 or 60 Hz line frequency and range up to about 3 kHz. Amplitude is significantly lower
than that of the nominal line voltage. The control signals are present only at the moments
that a remote appliance has to be controlled.
In Mains Signaling mode the 435-II and 437-II can capture the occurrence (signal level)
of control signals with 2 different frequencies. The frequency range is 70.0 – 3000.0 Hz
for 60 Hz systems and 60.0 – 2500.0 Hz for 50 Hz systems.
Selection of Frequency 1 and frequency 2 is attainable via key sequence SETUP, F4 –
MANUAL SETUP, select Limits with the up/down arrow keys, ENTER, F3 – EDIT,
select Mains Signaling with the up/down arrow keys, and press ENTER. Next use the
arrow keys to adjust Frequency 1 and 2.
The Duration of the measurement and Immediate or Timed start are selectable after a
measurement is set from HOLD to RUN.
Measuring results are presented in a Trend screen and in an Events Table.
Note: Mains Signaling is not available for measurements in 400 Hz power systems such
as offered in Fluke 437-II.
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