ACCURATE ELECTRONICS 104001C, Manual, Page: 9 / 10

ACCURATE ELECTRONICS INC Practice Section 104001C Rev B January 2014
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FIGURE 1. CIRCUIT DESCRIPTION.
TABLE 5 . Test Guide Checklist.
TEST TEST PROCEDURE NORMAL RESULTS IF NORMAL CONDITIONS ARE NOT
MET, VERIFY:
Receive Level Arrange transmit portion of transmission measuring set
(TMS) for 1004Hz tone output at –20dBm if module’s
RCV channel is optioned for gain or at 0dBm if
module’s RCV channel is optioned for loss. Also set
transmit portion of TMS for facility-side interface
impedance selected on module. Connect 1004Hz signal
to RCV in jack. Arrange receive portion of TMS for
terminated measurement at terminal-side inter-face
impedance selected on module, and connect it to RCV
out jack. Signal level indicated on TMS
corresponds to receive gain or
loss setting on module. - Power
- Wiring
- Proper impedance termination
(check for double termination)
- Impedance switches (S1 and S3) properly set
- Level switches (RCV gain/loss and RCV level)
properly set
- Replace module and re-test
Receive
Equalization Maintain connections as above. Adjust RCV EQL
switches for no equalization (all switches set to out).
Adjust module’s receive output level for 0dBm at
1004hz. Change input frequency to 2804Hz and add
equalization (up to maximum) by setting RCV EQL
switches to in one by one. Receive output level at 2804 Hz
increases to +7.5 dBm as
equalization is added. - Input level at 2804Hz same as at 1004Hz
- Terminating impedance correct
Transmit Level Arrange transmit portion of TMS for 1004Hz tone
output at –20 dBm if module’s XMT channel is optioned
for gain or at 0dBm if module’s XMT channel is
optioned for loss. Also set transmit portion of TMS for
terminal-side interface impedance selected on module.
Connect 1004Hz signal to XMT in jack. Arrange
receive portion of TMS for terminating measurement at
facility-side interface impedance selected on module,
and connected it to XMT out jack. Signal level indicated on TMS
corresponds to transmit gain or
loss setting on module. - Power
- Wiring
- Proper impedance terminations (check for double
terminations)
- Impedance switches (S1 and S3) properly set.
- Level switches (XMT gain/loss and XMT level)
properly set
- Replace module and re-test
Transmit
Equalization Maintain connection as above. Adjust XMT EQL
switches for no equalization (all switches set to out.
Adjust module’s transmit output level for 0dBm at
1004Hz. Change input frequency to 2804Hz and add
equalization (up to maximum) by setting XMT EQL
switches to in one by one. Transmit output level at 2804
Hz increases to +7.5 dBm as
equalization is added. - Input level at 2804Hz same as at 1004Hz
- Terminating Impedance correct
FIGURE 1. CIRCUIT DESCRIPTION.