Scope Input A, B, C, D Tests; Input A, B, C, D Vertical Accuracy Test - Fluke 190-104 Service Manual

Fluke 190-104/190-204
Service Information
10. Press
11. Press
12. Press
13. Turn the Test Tool OFF and ON to exit the calibration menu and to return to the
If the maximum, minimum, or default display contrast is not OK, then you can adjust
these items without performing a complete calibration adjustment; refer to Section 5 for
detailed information.

4.6 Scope Input A, B, C, D Tests

4.6.1 Input A, B, C, D Vertical Accuracy Test

Proceed as follows:
1. Connect the Test Tool to the 5500A as shown in Figure 4-3. The vertical channels A,
A
2. Select the following Test Tool setup:
4-6
Observe the display closely, and verify that the display shows no abnormalities. Also
verify that the contrast of the upper left and upper right square of the test pattern is
equal.
F2
.
The test pattern is removed; the Test Tool shows
F2
again to do the next step
F3
CALIBRATE
The Test Tool shows a light display; the test pattern as shown in Figure 4-2 may not
be visible or hardly visible.
Observe the display closely, and verify that the display shows no abnormalities.
normal operating mode.
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.
B, C and D are checked in succession so that there is one waveform on the screen at a
time. This assures the highest possible readout accuracy.
PM9091
B C D
PM9081
Figure 4-3. Test Tool Inputs A, B, C, D to 5500A Normal Output
Contrast (CL 0110):
Contrast (CL 0120):
WARNING
CONNECT TO CHANNEL A, B, C, D IN SUCCESSION
NO 50 OHM TERMINATION
NORMAL SCOPE
FLUKE 5500A CALIBRATOR