Input A, B, C, D Dc Voltage Accuracy Test - Fluke 190-104 Service Manual

Fluke 190-104/190-204
Service Information
Range
2 mV/div
5 mV/div
10 mV/div
20 mV/div
50 mV/div
100 mV/div
200 mV/div
500 mV/div
1 V/div
2 V/div
5 V/div
10 V/div
20 V/div
50 V/div
100 V/div

4.6.2 Input A, B, C, D DC Voltage Accuracy Test

Proceed as follows to verify the automatic dc voltage scope measurement:
4-8
Table 4-1. Vertical Accuracy Verification Points
Initial 5500A Setting,
V ac, sine, 50 Hz
4.243 mV
10.606 mV
21.213 mV
42.426 mV
106.06 mV
212.13 mV
424.26 mV
1.0607 V
2.1213 V
4.2426 V
10.606 V
21.213 V
42.426 V
106.06 V
212.13 V
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
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.
Allowable 5500A output for trace amplitude of
10.183 to 11.028
20.368 to 22.058
40.735 to 44.117
101.83 to 110.28
203.67 to 220.58
407.35 to 441.16
1.0184 to 1.1030
2.0367 to 2.2058
4.0735 to 4.4117
10.183 to 11.028
20.368 to 22.058
40.735 to 44.117
101.83 to 110.29
203.67 to 220.58
Note
±
(2.1% + 0.04 x range).:
±
= 60 mV (0.021 x 60 + 0.08 x 10)
±
= 60 mV (1.26 + 0.8) = 60 mV
WARNING
6 divisions
3.951 to 4.517
±
2.06 mV