Model 436A
Adjustments
ADJUSTMENTS
5-20. A-D CONVERTER
AND
LINEAR METER ADJUSTMENT
REFERENCE:
DESCRIPTION:
Service Sheets 7 and 8.
The
A-D
converter circuit
is
adjusted
to
obtain
the
specified digital readout accuracy
and
the
meter circuit
is
adjusted for a corresponding indication.
RANGE
CALIBRATOR
POWER
METER
DIGITAL
VOLTMETER
EQUIPMENT:
PROCEDURE:
iRECOROE;i
0000
cw
~
L OUTPUT
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Cl
POWER
METER
SENSOR
.._
-
-
-
Figure
5-5.
A-D
Converter
and
Linear
Meter
Adjustment
Setup
Range Calibrator . . . .
Digital Voltmeter (DVM) .
HP
11683A
HP
3456A
1. Set
the
Power Meter switches
as
follows:
CAL FACTOR
% .
POWERREF .
MODE
....
RANGE HOLD
LINE
...
100
off
(out)
WATT
off
(out)
ON (in)
2.
Set
the
Range Calibrator switches
as
follows:
FUNCTION.
RANGE
..
POLARITY.
LINE
...
STANDBY
lmW
NORMAL
ON (in)
3. Connect the equipment
as shown in Figure 5-5.
4. Remove the Power Meter
top
cover
and
set
the
DVM
to
the
1000
mV range.
5.
Press
the
Power Meter SENSOR ZERO switch and wait for
the
display readout
to
stabilize. Then release the SENSOR ZERO switch
and
wait for ZERO led
to
go
out
before proceeding
to
the
next
step.
6. Set
the
Range Calibrator FUNCTION switch
to
CALIBRATE
and
adjust the
Power Meter front-panel CAL ADJ
control
to
obtain a
1.000
Vdc indication on
the
DVM.
7.
Adjust the Power Meter LIN
potentiometer
A3R37 so
that
the
digital readout in-
dicates
1.000
mW.
5-7
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