Input A And B Ac Input Coupling Test - Fluke ScopeMeter 123 Service Manual

123
Service Manual
2. Select the following test tool setup:
3. Using
4. Set the 5500A to source the required AC voltage (NORMAL output, WAVE sine).
5. Observe the Input A and Input B main reading and check to see if it is within the
6. Continue through the test points.
7. When you are finished, set the 5500A to Standby.
Sensitivity
(Oscilloscope)
200 mV/div
2V/div
20V/div
1)
The 500V and 1250V range will be tested in Section 4.5.14

4.5.11 Input A and B AC Input Coupling Test

Proceed as follows to test the Input A and B AC coupled input lower transition point:
1. Connect the test tool to the 5500A as for the previous test (see Figure 4-5).
2. Select the following test tool setup:
4-16
•
Press to select auto ranging (
Do not press
•
Press to open the INPUT A MEASUREMENTS menu, and choose:
I
MEASURE on A:
•
Press to open the INPUT B MEASUREMENTS menu, and choose:
I
INPUT B: ON | MEASURE on B:
•
Move the Input A and Input B ground level (indicated by zero icon
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
set the Input A and B sensitivity to the first test point in Table 4-3.
The corresponding range is shown in the second column of the table.
range shown under the appropriate column.
Table 4-3. Volts AC Measurement Verification Points
1)
Range
(Meter)
500 mV
5V
50V
•
Use the setup of the previous step (AUTO time base, traces at vertical center).
•
Using select 200 mV/div for Input A and B (500 mV range).
in top of display).
AUTO
anymore!
VAC
I
VAC
keys move the ground level.
5500A output
Volts rms
500 mV
500 mV
5V
5V
50V
50V
5500A Reading A-B
Frequency
60 Hz 494.0 to 506.0
20 kHz 486.0 to 514.0
20 kHz 4.860 to 5.140
60 Hz 4.940 to 5.060
60 Hz 49.40 to 50.60
20 kHz 48.60 to 51.40
) to the