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The screen is updated constantly, so the
tester will display the state of the circuit
(Normal, Open, Short) without any further
menu commands. This makes it easy to test
multiple IDC by moving the wires from one
circuit to another.
Connect the Red Lead to the IDC+ wire, and
the Black Lead to the IDC- wire. Connect the Green Lead to earth. The TSIT
should display "Normal".
Possible causes for open circuit faults are missing smoke or heat detectors,
or a missing end-of-line resistor.
Possible causes for short circuits are activated pull-stations, detectors in
alarm or shorted wiring.
Test NAC/Signal
Test conventional Notification Appliance Circuits with this menu selection. At
the top level menu, navigate to [Test NAC/signal] with the up/down arrow
keys and press ENT to select the NAC test.
As with the IDC test, the NAC test updates in real-time once the test has
been selected.
Because of the reverse-polarity activation of Notification Appliances, the
NACs must be tested in the Standby condition.
Connect the Red Lead to the -NAC Alarm wire. Connect the Black Lead to
the +NAC Alarm wire. Connect the Green Lead to earth.
The TSIT will detect two 10k EOLRs on the circuit as a Short condition.
For Short circuits, also check that devices are not wired backwards.
For Open circuits, check to make sure the EOLR is intact.
ENT
IDC Test Result
Open
Press MENU to exit
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