ANATEL A643, Operator'S Manual, Page: 186 / 222

186 of 220 Troubleshooting - Anatel A643a
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Operator Manual
Anatel
2) Use the Up and Down Keys to specify the desired communications test.
3) Press Enter to execute the test. The results are presented on the Controller display
and a corresponding printout is generated. If the instrument fails either of the tests,
check the wiring before contacting Anatel for assistance.
4) Press Esc repeatedly in order to return to previous display screens.
14.4.3.1 DAC Output Test
The analog signal that the Anatel A643a sends to an optional external DAC module can be
verified over the chosen output range. Simply attach a multimeter to the module’s input
terminals to monitor the accuracy of the instrument’s display.
Fig 14-7 : I/O Diagnostics Screen
Fig 14-8 : RS-232 Loopback Wiring
Fig 14-9 : Digital I/O Loopback Wiring
TxD
RxD
SG
PG
RS-232C PORTS 1-3
OUT1*
OUT2*
COM–
BIAS
+12V
COM
OUTPUTS
COM+
IN1*
IN2*
INPUTS