Fluke 123B/S Service Manual - Page 75

Input A and B AC Input Coupling Test

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4 Performance Verification 4.5 Input A and Input B Tests 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: I VAC • Press to open the INPUT B MEASUREMENTS menu, and choose: INPUT B: I ON | MEASURE on B: I 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 4-3. 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). 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. Table 4-3. Volts AC Measurement Verification Points Sensitivity (Oscilloscope) Range 1) (Meter) 5500A output Volts rms 5500A Frequency 200 mV/div 500 mV 500 mV 60 Hz 2V/div 500 mV 20 kHz 5V 5V 20 kHz 5V 60 Hz 20V/div 50V 50V 60 Hz 50V 20 kHz 1) The 500V and 1250V range will be tested in Section 4.5.14 Reading A-B 494.0 to 506.0 486.0 to 514.0 4.860 to 5.140 4.940 to 5.060 49.40 to 50.60 48.60 to 51.40 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: • 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). 4-17

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Performance Verification
4.5 Input A and Input B Tests
4
4-17
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 4-3.
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).
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.
Table 4-3. Volts AC Measurement Verification Points
Sensitivity
(Oscilloscope)
Range
1)
(Meter)
5500A output
Volts rms
5500A
Frequency
Reading A-B
200 mV/div
500 mV
500 mV
60 Hz
494.0 to 506.0
500 mV
20 kHz
486.0 to 514.0
2V/div
5V
5V
20 kHz
4.860 to 5.140
5V
60 Hz
4.940 to 5.060
20V/div
50V
50V
60 Hz
49.40 to 50.60
50V
20 kHz
48.60 to 51.40
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:
•
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).