Verifying Ac Current - Fluke 5520A Service Manual

3-25. Verifying AC Current

Verify that the 5520A performance is within the limits in Table 3-27. Use the previously
verified UUT dc current function as the dc current source for making ac/dc current
transfers with the 5790A. Use the shunt values listed in Table 3-26. See Figure 3-17 for
proper equipment connections. For ranges 19 mA to 2 A, refer to Figure 3-7 and above
2 A, refer to Figure 3-8 for proper setup connections.
Range of Verification Points (rms values)
0 to 329.000 A
1.9 mA to 3.29990 mA
19 mA to 3.3 mA
30.0000 mA to 190 mA
300.000 mA to 2 A
2.99000 A to 20.0000 A
5790A
5790A AC MEASUREMENT
STANDARD
INPUT 1 INPUT 2
1000V RMS MAX 1000V RMS MAX
SHELL FLOATING
HI
SHUNT
3V RMS MAX
LO
WIDEBAND
7V RMS MAX
10V PEAK
SHELL FLOATING
MAX
GROUND GUARD
10V PK
MAX
Set 5790A to
external guard
Figure 3-17. Connections for Verifying AC Current with a Metal Film Resistor (3.2999 mA and Below)
Table 3-26. Shunt Values for AC Current Verification
Metal film
resistor
in enclosure
Calibration and Verification
Performance Verification Tests
Shunt
1 k metal film resistor in a shielded box
200 metal film resistor in a shielded box
Fluke A40 20 mA Shunt
Fluke A40 200 mA Shunt
Fluke A40 2A Shunt
Fluke A40A 20A Shunt
UUT
5520A CALIBRATOR
NORMAL AUX SCOPE
V, , ,RTD A, -SENSE, AUX V
OUT
HI
1000V 20V
1V PK
RMS RMS
MAX
MAX MAX
150V
LO
PK
MAX
TRIG
20V
RMS
MAX
20V
PK
SHELLS
20A
GUARD
NOT MAX
GROUNDED
20V PK MAX TC 20V PK MAX
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