SERVICE MANUAL R5888B
QUADRAMHO Chapter 5
Addendum 4
Page 2 of 2
The 3 voltages are set up as follows:
Voltage Amp 1 A phase (reference)
Voltage Amp 2 B phase (120° lag)
Voltage Amp 3 C phase (120° lead)
Magnitude of A is full phase voltage.
Magnitude of B and C should be equal and of a convenient value for the reach to
be measured.
V
BC
is now 90° lag from the reference.
One current amplifier should now be connected so as to inject current through the
B and C current circuits as shown.
The current amplifier angle set on the Doble should be (90 + RCA)° lag.
The current is now varied to find the reach point. The reach being given by:
Z
BC
=
3 V
B
I
BC
Live
Doble
current
amplifier
Common
A21 (1Y3)
A22 (1Y4)
A24 (1Y6)
A23 (1Y5)
SHPM
terminals
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