ACCURATE ELECTRONICS 104003C, Руководство пользователя, Страница: 10 / 10

ACCURATE ELECTRONICS INC Practice Section 104003C Rev A January 2014
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FIGURE 1. CIRCUIT DESCRIPTION.
TABLE 5. Test Procedure.
Test Test Procedure Normal
results
If Normal Conditions
Are Not Met, Verify:
Receive
Level
Connect properly terminated
TMS (receive) to
RX OUT jack.
Insert 1000Hz test tone at
specified level into
RX IN jack.
Signal level
corresponds to gain
or loss setting. -Power
-Wiring
-Proper impedance termination
(check for double termination)
-Impedance switches (S2 and S4) properly set
-Level/Equalizer switches (front-panel RX LEVEL and RX EQL) properly set
-Replace module and re-test
Transmit
Level
Connect properly terminated
TMS (receive) to
TX OUT jack.
Insert 1000Hz test tone at
specified level into
TX IN jack.
Signal level
corresponds to gain
or loss setting. -Power
-Wiring
-Proper impedance terminations (check for double terminations)
-Impedance switches (S2 and S4) properly set.
-Level/Equalizer switches (front-panel TX Level and TX EQL ) properly set
-Replace module and re-test
Tone
loopback
Connect selected loopback tone
at level indicated in CLR to
RX
IN jack; after 2 seconds change
frequency to 1kHz; measure
output at
TX OUT jack.
LPBK LED lights.
Measured transmit
level 1dB of
transmit level
indicated on CLR.
-Transmit and receive levels properly aligned.
-Correct looopback tone selected at S3.
-Lower loopback tone level 10dB and retest.
-Replace module and retest
Tone
loopback
release
Change test signal to selected
loopback tone. LPBK LED off after
approximately
1Second.
-Momentarily operate manual loopback (ground pin 1).
-Check transmit pair for shorted pairs.
-Replace module and retest.