STX Signal Transmitter Installation and Operation ... - Kistler-Morse

Appendix E. Trimming the Current Output
Appendix E. Trimming the
Current Output
If the calibration of the device receiving the
current output does not match the calibration
of the Current Output PCB (soldered to the
STX PCB), follow this procedure to ‘trim’ the
STX’s current output:
1. See Figure E-1 and TI-SP.STX-02 (standalone),
TI-SP.STX-03 (standard 19” rack),
or TI-MVS.STX-01 (MVS-STX) in
Appendix H.
• If a current monitoring device is
connected to Iout, connect an ammeter
in series with the device.
• If a monitoring device is not being
used, connect the ammeter positive
(+) lead to +Iout. Connect the negative
(-) lead to -Iout.
2. If the STX is off, apply power and let it
warm up for at least 15 minutes.
3. Place the STX at the 20 mA calibration
point by removing the jumper from JP3
Wdog and placing it on JP2 Factory.
Verify there is a jumper on JP1 Aux.
4. Press and hold SW1 (Up) and/or SW2
(Down) until the ammeter shows 20 mA.
5. Press SW1 and SW2 simultaneously
to place the STX at the 4 mA
calibration point.
6. Press and hold SW2 (Down) until the
ammeter shows 4 mA.
7. Press SW1 and SW2 simultaneously
to place the STX at the 0 mA
calibration point.
8. Press and hold SW2 (Down) until the
ammeter shows 0 mA.
9. Remove the ammeter from TB11.
10. Remove the jumper from JP2 Factory and
place it on JP3 Wdog, pins 1 and 2.
TB11 (STX PCB for stand-alone) or
TB4 (Termination PCB for 19” rack or MVS-STX)
-EXT+
-IOUT+
- +
- +
PLC or other
Current
Monitoring
Device
- +
A
-EXT+
Figure E-1. Two Methods for
Connecting Ammeter
-IOUT+
- +
- +
A
E-1