Input A&B Dc Voltage Accuracy Test - Fluke 199B Service Manual

The vertical accuracy test can also be done with dc voltage. This method is
advised for automatic verification using the Fluke Met/Cal Metrology
Software. For each sensitivity range you must proceed as follows:
1. Apply a +3 divisions voltage, and adjust the voltage until the trace is at
+3 divisions. Write down the applied voltage V1
2. Apply a -3 divisions voltage, and adjust the voltage until the trace is at
-3 divisions. Write down the applied voltage V2
3. Verify that V1-V2 = 6 x range
Example for range 10 mV/div. (range/div figure doubles because 2
measurements V1 and V2 are done for one accuracy check):
The allowed V1 - V2
4.6.2 Input A&B DC Voltage Accuracy Test
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 verify the automatic dc voltage scope measurement:
1. Connect the test tool to the 5500A as for the previous test (see Figure 4-3).
2. Select the following test tool setup:
•
Recall the created SETUP 1 (see section 4.4.3): press
select
SCREEN+SETUP
•
Press
•
Select
Polarity:
•
Press
•
Select
Polarity:
•
Press
3. Using
time base on 10 ms/div.
4. Using and
margin) approximately to the center grid line.
5. Using
sensitivity range to the first test point in Table 4-2.
The sensitivity ranges are indicated in the left and right lower display edge.
6. Set the 5500A to source the appropriate dc voltage.
7. Observe the readings (
under the appropriate column.
Due to calibrator noise, occasionally OL (overload) can be shown.
8. Continue through the test points.
9. When you are finished, set the 5500A to 0 (zero) Volt, and to Standby.
±
= 60 mV
= 60 mV
WARNING
1
, then press
INPUT A OPTIONS ...
Normal | Bandwidth:
, then press
INPUT B OPTIONS ...
Normal | Bandwidth:
to clear the softkey menu, and to see the full 8 divisions screen.
change the time base to select manual time base ranging, and lock the
move the Input A and B ground level (zero icon
and select manual vertical ranging and set the Input A and B
and
1.A 2.B
Note
(1.5% + 0.04 x range).:
±
(0.015 x 60 + 0.08 x 10)
±
(0.9 + 0.8) = 60 mV
, press
RECALL SETUP
10 kHz (HF Reject)
10 kHz (HF Reject)
) and check to see if it is within the range shown
Performance Verification
4.6 Scope Input A&B Tests
±
1.7 mV
, ,
RECALL
.
in the left
4
4-9