To 110 Mf Capacitance Verification; Capacitance Measurement - Fluke 5520A Service Manual

Range Output
1.09999 F 0.70000 F
1.09999 F 1.09000 F
3.29999 F 2.00000 F
3.29999 F 3.00000 F
10.9999 F 7.0000 F
10.9999 F 10.9000 F
32.9999 F 20.0000 F
32.9999 F 30.0000 F
109.999 F 70.000 F
109.999 F 109.000 F
329.999 F 200.000 F
329.999 F 300.000 F
1.09999 mF 0.33000 mF
1.09999 mF 0.70000 mF
1.09999 mF 1.09000 mF
3.2999 mF 1.1000 mF
3.2999 mF 2.0000 mF
3.2999 mF 3.0000 mF
10.9999 mF 3.3000 mF
10.9999 mF 10.9000 mF
32.9999 mF 20.0000 mF
32.9999 mF 30.0000 mF
110.000 mF 33.000 mF
110.000 mF 110.000 mF
3-27. 200 F to 110 mF Capacitance Verification
The 5520A calibrator can source capacitance values much larger than what most RCL
meters can measure. The method described below uses a dc current from a precision
current source and a high speed sampling digital multimeter to verify the 5520A
capacitance outputs from 200 F to 110 mF.

3-28. Capacitance Measurement

By definition, capacitance is the product of an applied current and the ratio of the
charging time to the charging voltage:
t
C I *
v
Table 3-28. Verification Tests for Capacitance (cont)
Test Frequency or
Current
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
50 Hz
50 Hz
54
80
90
180
270
270
540
800
900
2.7 mA dc
5.4 mA dc
8.0 mA dc
9.0 mA dc
27.0 mA dc
Lower Limit
0.69767 F
1.08693 F
1.99320 F
2.99130 F
6.9767 F
10.8693 F
19.9100 F
29.8800 F
69.662 F
108.529 F
dc 199.020 F
dc 298.680 F
dc 0.32788 mF
dc 0.69662 mF
dc 1.08529 mF
dc 1.0933 mF
dc 1.9902 mF
dc 2.9868 mF
dc 3.2788 mF
10.8529 mF
19.8300 mF
29.7600 mF
32.570 mF
108.800 mF
Calibration and Verification
Performance Verification Tests
Upper Limit
0.70233 F
1.09307 F
2.00680 F
3.00870 F
7.0233 F
10.9307 F
20.0900 F
30.1200 F
70.338 F
109.471 F
200.980 F
301.320 F
0.33212 mF
0.70338 mF
1.09471 mF
1.1067 mF
2.0098 mF
3.0132 mF
3.3212 mF
10.9471 mF
20.1700 mF
30.2400 mF
33.430 mF
111.200 mF
3
3-47