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•
'
t
Signal Generator
1042
Power Amplifier
2707
1~1i
:
il
~
lt------u
:
®
• • •
(i
)
•
:
Power Amp I ifier
2707
I~
1:
:
:1
~_
1
.,.__----i
l
:
®
-
;
_
e
:
·
-@
~:
Exciter
4801/4813
Exciter
4801/4813
Exciter
4801/4813
Test
Specimen
271026
Fig.3. 10.
Multiple Amplifier-Exciter Operation. Single signal source
If any Amplifier-Exciter pair trips, the input and DC centring signals wi II
be gated off from all amplifiers, but the only failure lamps lit will be the
relevant lamp on the amplifier that initiates the trip. Thus the offending pair
can be easily recognized and corrective action taken before continuing the
test.
Only the tripped amplifier requires to be reset before the test can
continue,
but
ensure that the drive signal is re-applied gradually to the
whole test set-up.
The OUTPUT IMPEDANCE can be chosen as detailed in section 3.3.1
for normal operation.
3.6.
VERY HIGH OUTPUT IMPEDANCE
In the "High" impedance mode an even higher output impedance (for
frequencies greater than 10 Hz) can be obtained by soldering a link across
23
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