Fluke 2180A - Manual (Page 56)

602-26. After transfer to the printer lines is complete,
the microcomputer checks the DATA SET READY and
CLEAR TO SEND lines from the RS232C Interface. If
both lines are high, the same message as was output on the
print lines is output on the RS232C and current loop lines
in a bit-serial format. Since the thermometer cycle rate of
333 ms is shorter than the time required to output data at
BAUD rate of 1200 and less, a message is not transmitted
during every instrument cycle.
602-27. CALIBRATION
602-28. Analog circuitry in the option should be
calibrated every 90 days or after any repair of the unit.
The procedure following assumes that power is supplied
to the unit and that a Digital Voltmeter capable of reading
10 m V on the 1 volt, or equivalent range, i.e., a Fluke
Model 8800A, is available.
1. Remove power from the instrument.
2. Remove the top cover from the thermometer.
21X0A-002
7. Set the FUNCTION switch (S2) to position I
(CAL 1).
8. Adjust R26 for an output of 0 ± O.I mV dc.
9. Set the FUNCTION switch to position 2 (CAL
2).
10. Adjust R15 for an output of 0 ± 0.1 mV dc.
11. Set FUNCTION switch to position 3 (CAL 3).
12. Adjust R11 for an output of -lOV ± 1 mV dc.
13. Set FUNCTION switch to position 4 (CAL 4).
14. Adjust RI9 for an output of+I0V ± I mV dc.
15. Remove power and the test DMM, then
reinstall the option pcb on the Main PCB and the
top cover on the instrument.
3. Remove the screws attaching the option pcb to
the Main PCB.
4. Leaving the interconnect cables connected,
turn the option pcb to the right, while facing the
instrument, exposing the component side and
making the switches and adjustment accessible.
602-29. TROUBLESHOOTING
602-30. Troubleshooting for the 2180A Option -002,
Output Unit, consists of the tabular flow chart in Table
602-4. When a step on the flow chart is completed, check
for a decision transfer. If no decision is required, perform
the next step of the table in sequence.
5. Connect the DMM to the Analog Output
Connector.
6. Apply power to the instrument and allow if to
warm-up for a minimum of 5 minutes.
602-31. LIST OF REPLACEABLE PARTS
602-32. Table 602-5 is a list of replaceable parts for the
Output Option. Refer to Section 5 for an explanation of
the columnar entries.
602-4