Fluke 5500A, Service Manual

Page: 78 / 296

5500A
Service Manual
3-24
Table 3-16. Resistance Accuracy Test (cont.)
Nominal Value Measured Value (Ohms) Deviation % 90-Day Spec. (m
Ω
or %)
300 k
Ω
0.011%
330 k
Ω
0.028%
1.09 M
Ω
0.016%
1.19 M
Ω
0.016%
1.9 M
Ω
0.014%
3 M
Ω
0.013%
3.3 M
Ω
0.062%
10.9 M
Ω
0.050%
11.9 M
Ω
0.080%
19 M
Ω
0.078%
30 M
Ω
0.077%
33 M
Ω
0.415%
109 M
Ω
0.406%
119 M
Ω
0.413%
290 M
Ω
[1] 0.403%
[1] Perform this test using the HP 3458A in the 10 M
Ω
range and the Fluke 742A-10M in
parallel with the 5500A output. Using exactly 10 M
Ω
, the nominal value is 9.66667 M
Ω
. Figure 3-4
shows the connections and the equation you use to calculate actual resistance.
3-31. Resistance DC Offset Measurement
The Resistance DC Offset Measurement test checks the dc offset of the amplifiers used
in synthesizing resistance. Prior to performing this test, make sure you zero the 5500A
Calibrator following the “Zeroing the Calibrator” procedure described earlier in this
chapter. Set the output to 100 ohms, COMP OFF, and measure the NORMAL terminals
with a dc millivoltmeter. Table 3-17 shows the test point.
Table 3-17. Resistance DC Offset Measurement Test
Range Nominal Value Measured Value (V)
(NORMAL)
Deviation % 8-Hour Spec.
100
Ω
0.000 mV 0.010 mV