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525A
Users Manual
6-12
Testing Ohms Input
Before measuring ohms input, you need to “characterize” the ohms output of a
5520A. To achieve the needed accuracy, the Wavetek 1281 will be used as a
transfer standard and the 742A will be used as the reference standard. To find the
true value of the 5520A output, the ratio input function of the Wavetek 1281 will
be used. The ratio function of the 1281 is located on the rear panel and is
designated as Channel A and Channel B. Connect Channel A to the 742A and
connect the 5520A to Channel B, both using four-wire measure. See Figure 6-7 for
a connection diagram.
1281
5520 A
Rear inputs
742
Hi
I
I
Lo
+
-
Hi
I
I
Lo
+
-
Chan A
Chan B
ajr28f.eps
Figure 6-7. 1281 Connection Diagram
Summary of Contents for 525A
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