Pulsar TCF-10B, System Manual, Page: 71 / 249

To test the Phase Comparison Units (Only), complete the five steps depicted in Table 5-8 below.
Rcvr Logic CLI/Discrim. Solid State Outputs Low
LEDs LEDs Signal
Trip – Trip + Noise Low Level Noise Trip – Trip + Contact
1) Check initial LED, output, and contact states:
OFF OFF ON OFF + V* + V* 0 V 0 V OPEN
2) Remove input signal from chassis; observe states as follows:
ON ON ON ON + V* 0 V + V* + V* CLOSED
3) Open SW1-3 on Receiver Logic Module; observe states as follows:
OFF OFF ON ON + V* 0 V 0 V 0 V CLOSED
4) Close SW1-3 (SKBU) and re-connect input signal to chassis. Set input frequency to 250.500
kHz (EWB), or 250.250 kHz (WBWS); or required fre 500 Hz (EWB), or required
fre 250 Hz (WBWS). Observe states as follows:
ON OFF OFF OFF 0 V + V* + V* 0 V OPEN
5) Set input frequency to 249.500 kHz (EWB), or 249.750 kHz (WBWS); or required frequency -
500 Hz (EWB), or required frequency -250 Hz (WBWS). Observe states as follows:
OFF ON OFF OFF 0 V + V* 0 V + V* OPEN
April 1997 Page 5–9
Chapter 5. Acceptance Tests
5
Table 5–8. Phase Comparison Units (Only) Testing.
* + V (Nominal) outputs equals the voltage applied to the TB1-1, usually station battery.
Good
Channel
OFF
OFF
OFF
ON
ON