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Output En a ble and Protectio n
This section is on schematic 6Κ .
HP 811 OA Service Guide
U
600C detects the upper output
p
eak voltage
l
evel
a
nd U601B
detects the
l
ower output
p
eak voltage
l
evel from
t
he signals
p
rovided
by
C
R400 and
C
R401 (6Ι ).
The Microprocessor sends the Adjust DAC (6C)
p
ower limits relative
to the upper and
l
ower output
l
evels . These 4 signals are applied
to
U
602A, Β , C and
D,
pulling
d
own R620 if
t
he output
w
aveform
exceeds
i
ts
p
ermissible output
v
oltage range . This switches
U
605A
a
nd FETs
U
606A
a
nd Β ,
o
perates relay Κ 403, switching the output
to an internal 50 Ω
l
oad,
R
412, representing the external load.
Fun ctio nal Description 7-33
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