TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.36. VPN 98 - 024 TESTS AND TEST CONDITIONS
The source and load resistors (and the fixture transformer for the IEEE and FCC
methods) are assumed to be on the fixture, but are not shown on the Editor schematic.
They are switched in circuit using an OUT test that must be inserted in the program
before the GBAL test. (The relay patterns associated with inserting and removing
fixture resistors have deliberately not been included in the GBAL test dialogue for
two reasons: a) it would make the dialogue too complicated, and b) it is not always
necessary - e.g. in the case of a fixture where the resistors are permanently fitted in
circuit).
After the two measurements have been taken, the longitudinal balance is calculated
from the ratio of the two outputs:
GBAL = 20 log | V
M1
/ V
M2
|
+ (optionally) compensation for test fixture scaling
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