Fluke 52120A, Руководство пользователя

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52120A
Users Manual
5-10
verification points.
17. Set the DMM ‘-c’ and ‘÷z’ stores to -0.8 for the -2 volt measurement.
18. Record the measured errors.
19. Set the 5720A output to the values in Table 5-4 for all the ac voltage verification
points and record the measured error. Use the transfer method for all ac
measurements.
For each ac measurement in Table 5-4:
•
Set the 5720A output voltage and frequency to the reference level shown in
Table 5-4.
•
Push
M
on the Product.
Note
For currents larger than 50 % of Product range, let the shunt become
stable for a minimum of five minutes.
•
Set the DMM to rear input.
•
Turn off the ‘*m’, ‘-c’ and ‘÷z’, and % math functions on the DMM.
•
Let the measurement become stable for a minimum of one minute. Longer when
the 10 Hz and 40 Hz filter is on.
•
Use Last Reading and Enter to store the last measurement in the ‘÷z’ and ‘-c’
stores of the DMM.
•
Turn on the ‘-c’ and ‘÷z’ math functions on the DMM.
Note
The DMM measurement must be 0.000000 V plus a few digits of noise.
•
Turn on the ‘*m’ and ‘%’ math functions to apply the correction factor and show
the measurement in percent.
•
Set the 5720A to the values in the row below the reference level row.
•
Set the DMM to front input.
•
Let the measurement become stable and then write in the measured error in
Table 5-4.
Table 5-4. 20 Amp Range Verification Points
5720A
Output
8508A
ACV
filter
8508A
Input
A40B
Measured
Error (%)
Product
Specification
(99 %)
Measurement
uncertainty
(99 %)
TUR
1 V dc - Front 20 A
±
0.0200 %
±
0.0069 % 2.9:1
-1 V dc - Front 20 A
±
0.0200 %
±
0.0069 % 2.9:1
2 V dc - Front 20 A
±
0.0150 %
±
0.0036 % 4.1:1
-2 V dc - Front 20 A
±
0.0150 %
±
0.0036 % 4.1:1
0.56 V, 10 Hz 10 Rear 20 A - Reference level
1.4 V, 10 Hz 10 Front 20 A
±
0.1007 %
±
0.0076 % 13:1
0.8 V, 57 Hz 40 Rear 20 A - Reference level
2 V, 57 Hz 40 Front 20 A
±
0.0750 %
±
0.0057 % 13:1