Performance Tests
Model436A
PERFORMANCE TESTS
4-10. ZERO CARRYOVER TEST
SPECIFICATION: ±0.2%
of
full scale when zeroed
on
the
most sensitive range.
DESCRIPTION:
EQUIPMENT:
PROCEDURE:
4-2
After
the
Power Meter
is
initially zeroed
on
the
most
sensitive range,
the
change in
the
digital readout is
monitored
as
the
Power Meter is stepped through its ranges. Thus,
this
test
also takes noise and
drift
into
account because noise ,
drift,
and zero carry-
over readings
cannot
be separated.
RANGE
CALIBRATOR
POWER
METER
aaa@lwa
l
POWER
METE:
SENSOR
-
Figure
4-1.
Zero
Carryover
Test
Setup
Range Calibrator . . . . . . . HP 11683A
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 . ST
AND
BY
POLARITY . NORMAL
RANGE
lOOµW
LINE . . . ON (in)
NOTE:
After
switching
to
STANDBY, allow
60
seconds for the
Range
Calibrator to settle before zeroing the Power Meter.
3. Connect
the
equipment
as shown in Figure 4-1.
4. Press and
hold
the
Power Meter SENSOR ZERO switch and wait for
the
digital
readout
to
stabilize. Then verify
that
the
Power Meter ZERO lamp is
lit
and
that
the
digital
readout
indicates 0.00 ± 0.02.
NOTE: Power Meter
is
now zeroed on most sensitive range
(10
µ
W).
5.
Release
the
Power Meter SENSOR ZERO switch and wait for
the
ZERO lamp
to
go
out
before proceeding
to
the
next
step.
6. Set
the
Range Calibrator FUNCTION switch
to
CALIBRATE and verify
that
the
Power Meter a.utcranges
to
the
100
µ.W
range.
7. Set
the
Power Meter RANGE HOLD switch
to
on
(in)
and
the
Range Calibrator
FUNCTION switch
to
standby.
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