Precision Process Calibrator
Performance Tests
19
Ohms Input
The ohms input performance test verifies the ohms input on the front of the Product.
Before an ohms input is measured, the ohms output of a 5522A must be “characterized”.
To get the necessary accuracy, the 8508A is used as a transfer standard and the 742A is
used as the reference standard. To find the true value of the 5522A output, use the ratio
input function of the 8508A. This is located on the front and rear panels. Connect the
742A to the front terminal and connect the 5522A to the rear terminals. Use four-wire
measure for both. See Figure 7 for connections.
TRIG
5V PK MAX
REAR INPUT
CURRENT
FUSE.
F 1.6AH
5x20mm
IEC127
INPUT (2 WIRE)
HI
LO
GU
3A PK MAX
920V
PK MAX
1420V
PK MAX
LO
HI
CALIBRATION
SENSE (4 WIRE )
ENABLE
DISABLE
A
CAT I @ 1000V
742A
8508A Front 8508A Rear
Sense Hi
Hi
Lo
Sense Lo
5520A
Sense Hi
Hi
Lo
Sense Lo
gxm015.eps
Figure 7. Ohms Input Performance Test Connections
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