Fluke 190-104 - Input A, B, C, D AC Voltage Accuracy Test (LF)

Fluke 190-104/190-204
Service Information
4-12
4.6.3 Input A, B, C, D AC Voltage Accuracy Test (LF)
This procedure tests the Volts ac accuracy with dc coupled inputs up to 50 kHz. The
high frequencies are tested in sections 4.6.10, 4.6.12, 4.6.14 and 4.6.16.
Warning
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.
Proceed as follows to test the Input A, B, C and D automatic scope ac Voltage
measurement accuracy:
1. Connect the Test Tool to the 5500A as for the previous test (see Figure 4-4).
2. Select the following Test Tool setup:
• Recall the created setup (e.g. SETUP 1, see section 4.4.3): press
SAVE
,
F2
RECALL , select SCREEN+SETUP 1 , press
ENTER
to recall the setup .
• Press
A
, then press
F4
INPUT A OPTIONS ...
• Select
Polarity: Normal | Bandwidth: 20 MHz (HF Reject) | Offset Range:
Normal .
• Press
B
, then press
F4
INPUT B OPTIONS ...
• Select
Polarity: Normal | Bandwidth: 20 MHz (HF Reject) | Offset Range:
Normal .
• Press
C
, then press
F4
INPUT C OPTIONS ...
• Select
Polarity: Normal | Bandwidth: 20 MHz (HF Reject) | Offset Range:
Normal .
• Press
D
, then press
F4
INPUT D OPTIONS ...
• Select
Polarity: Normal | Bandwidth: 20 MHz (HF Reject) | Offset Range:
Normal .
• Press
CLEAR
to clear the softkey menu, and to see the full 8 divisions screen.
3. Using
TIMEsns
change the time base to select manual time base ranging. Lock the
time base on 20 μs/div for the 20 kHz signals, and on 10 ms/div for the 60 Hz signal.
4. Press
A
: using
MOVE
and
MOVE
move the Input A ground level (indicated by the
zero icon
in the left margin) to the center grid line.
5. Using
mV
RANGE
and
V
RANGE
select manual vertical ranging, and set the Input A sensitivity
range to the first test point in Table 4-3.
The sensitivity ranges is indicated in the lower display edge.
6. Set the 5500A to source the appropriate ac voltage.
7. Observe reading
A and check to see if it is within the range shown under the
appropriate column.
8. Continue through the test points.