Detcon FP Transmitter Test Fixture - Manual (Page 5)

Detcon Model FP Transmitter Test Fixture
Page 5 of 5
3 - Check the bridge voltage. Insert DVM probes into the bridge “+” and “–“ test points.
Adjust the VOLT potentiometer on the transmitter until you achieve a reading of 2.70V.
Verify that the bridge voltage LED meter on the test fixture tracks closely with a reading
of 2.7V (±0.1V). Verify adjustability to either side of 2.70V.
4 - Perform zero cal. Verify SW1 is in the “0” position. Insert DVM probes into the
signal “+” and “–“ test points. Adjust the ZERO potentiometer on the transmitter until
you achieve a reading of 40mV. Verify that the mA output LED meter tracks closely with
a reading of 4.0mA. Verify adjustability to either side of 40mV.
5 - Perform span cal. Turn SW1 to the “50” position. With the DVM probes in the signal
“+” and “–“ test points, adjust the SPAN potentiometer on the transmitter until you
achieve a reading of 120mV. Verify that the mA output LED meter tracks closely with a
reading of 12.0mA. Verify adjustability to either side of 120mV. Do the same with the
FINE potentiometer to check adjustability.
6 - Check different ranges. Turn SW1 to the 10 position and verify a signal of
56mV/5.6mA (±5%). Turn SW1 to the 20 position and verify a signal of 72mV/7.2mA
(±5%). Turn SW1 to the 100 position and verify a signal of 200mV/20.0mA (±5%).
7 - Check signal fault (open active). Toggle SW3 to the OPEN position and note the
“DET FLT” LED on the transmitter illuminates. Return SW3 to the NORMAL position.
NOTE: The test fixture does not check for bridge fault on the FP-424C transmitter.
4.2 FP-524x Transmitters
Require tools:
Detcon PN 327-000000-000 MicroSafe™ Programming Magnet
NOTE: These instructions cover testing of the main features of the FP-524x transmitter.
See the applicable FP-524x instruction manual for a complete list of program features
and detailed operating procedures.
1 - Turn the power switch on. Both digital LED meters should illuminate.
2 - Plug the FP-524x transmitter into P1.
3 - Set the bridge voltage.
a) At the transmitter, enter the programming menu by holding the programming
magnet stationary over “PGM 2” for 30 seconds until the display reads “VIEW
PROG STATUS”, then withdraw the magnet.