Fluke 123B/S Service Manual - Page 72

Input A and B DC Voltage Accuracy Test, WARNING

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123/124 Service Manual 20. Verify that no trace is shown on the test tool display, and that the status line at the display bottom shows Wait:B . If the display shows the traces and status Hold:B , then press to re-arm the test tool for a trigger. 21. Increase the 5500A voltage slowly in 0.1V steps, using the 5500A EDIT FIELD function, until the test tool is triggered, and the traces are shown. 22. Verify that the 5500A voltage is between +1.5V and +2.5V when the test tool is triggered. To repeat the test, start at step 19. 23. Set the 5500A to Standby. 24. Press to clear the display. 25. Press to enable the arrow keys for Trigger Level and Slope adjustment. 26. Using select negative slope triggering ( ). 27. Using set the trigger level to +2 divisions from the screen center. For negative slope triggering, the trigger level is the bottom of the trigger icon ( ). 28. Set the 5500A to source +3V DC. 29. Verify that no trace is shown on the test tool display, and that the status line at the display bottom shows Wait:B . If the display shows the traces and status Hold:B , then press to re-arm the test tool for a trigger. 30. Decrease the 5500A voltage in 0.1V steps, using the 5500A EDIT FIELD function, until the test tool is triggered, and the traces are shown. 31. Verify that the 5500A voltage is between +1.5V and +2.5V when the test tool is triggered. To repeat the test, start at step 28. 32. When you are finished, set the 5500A to Standby. 4.5.9 Input A and B DC Voltage Accuracy Test WARNING Dangerous voltages will be present on the calibration source and connecting cables during the following steps. Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool. Proceed as follows: 1. Connect the test tool to the 5500A as for the previous test (see Figure 4-5). 2. Select the following test tool setup: • Press select auto ranging (AUTO in top of display). • Press to open the INPUT A MEASUREMENTS menu, and choose: MEASURE on A: I VDC • Press to open the INPUT B MEASUREMENTS menu, and choose: INPUT B: I ON | MEASURE on B: I VDC 4-14

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123/124
Service Manual
4-14
20.
Verify that no trace is shown on the test tool display, and that the status line at the
display bottom shows
Wait:B
.
If the display shows the traces and status
Hold:B
,
then press
to re-arm the test tool for a trigger.
21.
Increase the 5500A voltage slowly in 0.1V steps, using the 5500A EDIT FIELD
function, until the test tool is triggered, and the traces are shown.
22.
Verify that the 5500A voltage is between
+1.5V and +2.5V
when the test tool is
triggered.
To repeat the test, start at step 19.
23.
Set the 5500A to Standby.
24.
Press
to clear the display.
25.
Press
to enable the arrow keys for Trigger Level and Slope adjustment.
26.
Using
select negative slope triggering (
).
27.
Using
set the trigger level to +2 divisions from the screen center.
For
negative slope
triggering, the trigger level is the
bottom
of the trigger icon (
).
28.
Set the 5500A to source +3V DC.
29.
Verify that no trace is shown on the test tool display, and that the status line at the
display bottom shows
Wait:B
.
If the display shows the traces and status
Hold:B
,
then press
to re-arm the test tool for a trigger.
30.
Decrease the 5500A voltage in 0.1V steps, using the 5500A EDIT FIELD function,
until the test tool is triggered, and the traces are shown.
31.
Verify that the 5500A voltage is between
+1.5V and +2.5V
when the test tool is
triggered.
To repeat the test, start at step 28.
32.
When you are finished, set the 5500A to Standby.
4.5.9 Input A and B DC Voltage Accuracy Test
WARNING
Dangerous voltages will be present on the calibration source
and connecting cables during the following steps.
Ensure that
the calibrator is in standby mode before making any connection
between the calibrator and the test tool.
Proceed as follows:
1.
Connect the test tool to the 5500A as for the previous test (see Figure 4-5).
2.
Select the following test tool setup:
•
Press
select auto ranging (
AUTO
in top of display).
•
Press
to open the INPUT A MEASUREMENTS menu, and choose:
MEASURE on A:
■
VDC
•
Press
to open the INPUT B MEASUREMENTS menu, and choose:
INPUT B:
■
ON | MEASURE on B:
■
VDC