Fluke 190-062, -102, -104, -202, -204, -502, -504
Service Manual
4-16
Input A, B, C, D AC-Coupled Lower Frequency Test
Note
The test steps for channel C and D are only for the models
190-104, 190-204, and 190-504.
To test the ac-coupled input low-frequency accuracy:
1. Connect the Test Tool to the 5502A as for the previous test (see Figure 4-4).
2. Select the Test Tool setup:
a) Recall the setup (
Standard Test Tool Setup
). Press
SAVE
,
F2
(
RECALL) and
select
SETUP
, press
ENTER
, select the setup name, and
press
ENTER
to recall the setup.
b) Press
SCOPE
.
c)
Press
F2
(–
READING
…) and select with
F1
(–
READINGS)
and
:
Reading 1, on A, V ac
Reading 2, on B, V ac
Reading 3, on C, V ac
Reading 4, on D, V ac
d) Press
A
and use
F2
to select
COUPLING AC.
e) Press
B
and use
F2
to select
COUPLING AC.
f) Press
C
and use
F2
to select
COUPLING AC.
g) Press
D
and use
F2
to select
COUPLING AC.
h) Press
CLEAR
to clear the softkey menu and see the full display.
3. Use
TIME
s
ns
to change the time base to lock the time base on 40 ms/div.
4. Use
mV
RANGE
and
V
RANGE
to set the Input A, B, C and D sensitivity range to
500 mV.
5. Set the 5502A to source the appropriate ac voltage and frequency listed in
Table 4-5.
6. Observe the reading
A, B, C,
and
D
and check that they are within the range
shown under the appropriate column.
7. Continue through the test points.
8. When you are finished, set the 5502A to 0 (zero) Volt and Standby.
Table 4-5. Input A, B AC Input Coupling Verification Points
5502A output, V rms
5502A Frequency
2 Ch Reading
4 Ch Reading
900 mV
60 Hz
873 mV to 920 mV
859 mV to 933 mV
900 mV
5 Hz
>630 mV
>630 mV
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