Fluke ScopeMeter 123, Service Manual, Page: 48 / 96

Fluke 123/124/125
Service Manual
3-18
3.5.10 Input A and B AC 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 to test the Input A and B AC Voltage accuracy:
1. Connect the test tool to the 5500A as for the previous test (see Figure 3-5).
2. Select the following test tool setup:
•
Press to select auto ranging (
AUTO
in top of display).
Do not press anymore!
•
Press to open the INPUT A MEASUREMENTS menu, and choose:
MEASURE on A: Vac
•
Press to open the INPUT B MEASUREMENTS menu, and choose:
INPUT B: ON | MEASURE on B: Vac
•
Move the Input A and Input B ground level (indicated by zero icon ) to the center
grid line. Proceed as follows:
⇒
Press to enable the arrow keys for moving the Input A ground level.
⇒
Press to enable the arrow keys for moving the Input B ground level.
⇒
Using the keys move the ground level.
3. Using set the Input A and B sensitivity to the first test point in Table 3-3.
The corresponding range is shown in the second column of the table.
4. Set the 5500A to source the required AC voltage (NORMAL output, WAVE sine). Set
the 5500A to Operate (OPR).
5. Observe the Input A and Input B main reading and check to see if it is within the range
shown under the appropriate column.
6. Continue through the test points.
7. When you are finished, set the 5500A to Standby.