HP 436A - DC Offset and Auto Zero Adjustments

,
•
. 1
'
Model 436A
Adjustments
ADJUSTMENTS
5-16.
DC
OFFSET ADJUSTMENT
REFERENCE:
DESCRIPTION:
EQUIPMENT:
PROCEDURE:
Service
Sheet
8.
DC
OFF
potentiometer
A3R2
is adjusted
to
remove any de voltage introduced by
the
de amplifier
RANGE
CALIBRATOR
POWER
METER
ooo@lwa
l
POWER METE-A
SENSOR
-
Figure
5-1.
DC
Offset
Adjustment
Setup
Range Calibrator . . . . . . . HP 11683A
1.
2.
Set
the
Power Meter Switches
as
follows:
CAL FACTOR
% .
POWERREF
:
MODE
....
RANGE
HOLD
LINE
....
100
off
(out)
WATT
off
(out)
ON
(in)
Set
the
Range Calibrator switches
as
follows:
FUNCTION
. CALIBRATE
POLARITY
.
NORMAL
RANGE
100
mW
LINE . . .
ON
(in)
3. Connect
the
equipment as shown in Figure 5-1.
4. Verify
that
the
Power Meter autoranges
to
the
100
mW
range,
then
set
the
RANGE
HOLD
switch
to
ON
(in).
5.
Set
the
Range Calibrator
FUNCTION switch
to
ST
AND BY.
6. Remove
the
Power Meter
top
cover and adjust
DC
OFF
potentiometer A3R2 so
that
the
digital
readout
indicates
00.0
with a blinking minus sign.
5-17.
AUTO ZERO OFFSET ADJUSTMENT
REFERENCE:
DESCRIPTION:
Service
Sheet
8.
ZERO
OFF
potentiometer
A3R47
is
adjusted
to
remove any de offset
that
is
intro-
duced when the
SENSOR ZERO switch
is
pressed.
5-3