Fluke ScopeMeter 123, Service Manual, Page: 49 / 96

Performance Verification
3.5 Input A and Input B Tests
3
3-19
Table 3-3. 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 3.5.14
3.5.11 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 3-5).
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).
•
Fluke 123/124: press / to open the SCOPE INPUTS menu, and choose:
INPUT A: AC | NORMAL | INPUT B: AC | NORMAL
•
Fluke 123/124: press / to open the SCOPE INPUTS menu.
•
Fluke 123/124: press to open the TRIGGER menu, and choose:
INPUT: A | SCREEN UPDATE: FREE RUN | AUTO RANGE: > 1Hz
•
Fluke 125: press to open the A MEASUREMENTS menu, and choose:
•
Fluke 125: press to open the A INPUT menu, and choose:
INPUT A: AC | NORMAL
•
Fluke 125: press to open the B MEASUREMENTS menu, and choose:
•
Fluke 125: press to open the B INPUT menu, and choose:
INPUT B: AC | NORMAL
•
Fluke 125: press to open MENU.
•
Fluke 125: press to open the TRIGGER menu, and choose:
UPDATE: FREE RUN | AUTO RANGE: > 1Hz
3. Set the 5500A to source an AC voltage, to the first test point in Table 3-4 (NORMAL
output, WAVE sine). Set the 5500A to Operate (OPR).