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the instrument will sound an urgent “warble” tone and be
accompanied by the symbols
G
.
The instrument should be immediately disconnected from the
supply after discharging the dc test voltage taking care to ensure
Safe Working Practices. (NB very high induced voltages may be
present)
To assist user safety, the instruments will not permit a test to be
started if the induced voltage exceeds 8 mA.
It is possible to adjust the test voltage using the up and down
arrow buttons, either before or during an IR and IR(t) test. Once
a test has begun, it is advisable to only adjust the voltage in the
first 10s of the test to prevent interference with the capacitive and
absorptive currents in the insulator.
A test can be started by pressing the ‘TEST‘ button for
approximately 3 seconds from either the test screen
or voltmeter screen. A timer will be displayed to
indicate elapsed time during the test. The test is
stopped by pressing the TEST button. As soon as the
test is stopped a discharge of the insulator is automatically
initiated and the display indicates a voltage if present on the
insulator.
Do not disconnect instrument leads or clamps until the LED
and display warnings are switched off indicating that the unit
under test is discharged! Significant current can be stored in
reactive loads which act as capacitors or inductors, which
can be lethal.
The display shows the final resistance result, capacitance, test
current and time constant (TC) in addition to test duration.
On all S1 models the result can be saved by pressing the
dedicated save (
) button after a resistance test is complete.
The save icon will appear momentarily to confirm the data is saved.
If a full test curve is required the user must select logging by
pressing the save button
before starting the test
. In this case, data
will be logged every 5 seconds for the duration of a resistance test. It
is not possible to log voltages in voltmeter mode.
If temperature entry has been activated a prompt will appear for the
user to enter a temperature reading after IR and IR(t) insulation
tests. If relative humidity has been activated the user should enter a
humidity reading. DAR, PI, SV, Ramp and DD tests will
not
prompt
for temperature or humidity input.
Display backlight is activated by pressing the (
J
) button. The
backlight button can be pressed a second time to deactivate the
backlight. Automatic deactivation will occur after a pre-set timeout
period if not deactivated manually.
Filter button and settings
All S1 models have a dedicated filter button which
can
be set before or after starting an IR test .
The filter has four settings; 10 s, 30 s, 100s, 200s. It is also possible
to turn off the hardware filter to speed up the response when there is
no noise present. If a one minute spot test is to be performed a
suitable filter would be 10 s or possibly 30 s activated towards the
end of the test. Setting a longer filter would be meaningless because
the test only lasts 60 s. The S1 range memorises all results in the
current test to be able to give an instantaneous meaningful filtered
reading of results as long as the duration of test is longer than the
filter length.
Memory functions, downloading and remote control
All S1 models have advanced storage, recall and download
functions to facilitate documentation of insulation tests. Download is
enabled via a USB cable or Bluetooth
®
connection.
