Wavetek 3000 - Output Meter Accuracy Test

4 .5 .1 Output Meter Accuracy Test
EQUIPMENT
Power Meter
and Sensor
PROCEDURE
Note that no step attenuatorpads are active in the +10dBm
and 0 dBm positions . A leveled pin-diode attenuator reduces
the
output level
by
10 dB
in
all positions
of the
output
step attenuator below +10 dBm .

The output levelover the
entire range of +13 dBm to -137 dBm including a 10 dB vernier
is
controlled
by the pin
leveler
system
.
The output step attenuator
error
is measured by an
RF
sub-
stitution method . Each of the fivepads in the output step
attenuator is measuredat 520 MHz . The second 30 dB pad
and the 40 dB padare measured in combination with other
pads .

A reference output level is set with a power meter .
A reference trace is obtainedwith a spectrum analyzerand a
standard attenuator pad .

The standardpad is removed and
the output step attenuatorposition to be measured is sub-
stituted .

The spectrum analyzer trace is returned to the
reference level by resetting the Signal Generator output
level .

The resulting Signal Generator output level is
measured and compared to theoriginal powermeter reference
level
.

A
26 dB
RF amplifier
is
required to boost signal
levels
below
the
-60dBm level .
HP435A/8481A
1 . Setthe Signal Generator controls
FREQUENCY selector
MODULATION MODE
MODULATION FREQ
MODULATION FM/AM
OUTPUT VERNIER
OUTPUT step attenuator
power
cates
NOTE :
PERFORMANCE TESTS
as follows :
050 .000 MHz
CW
(Inactive in CW
MODE)
(Inactive in CW
MODE)
Fully Clockwise
+10 dBm
Set the
sensor
2 .
Calibrate the powermeter
and power
sensor
.
power meter to the+15dBm range .

Connect the power
to the Signal Generator
RF
out connector .

(When reading the
meter, set the range switch so that
the meterindi-
between 0 and -5
dBm) .
The Signal Generator indicated output level is equal
to thesum of the OUTPUT meter reading and the step attenuator
setting .

The difference between the actual power meter
reading andthe indicated output level is the OUTPUT meter
error . For example, the indicated output level is +13dBm
for an OUTPUT meter reading of +3 dBmand an OUTPUT step
attenuator setting of +10 dBm .

If the power meter reading
is +13 .15 dBm, the OUTPUT meter error is +0 .15 dB .
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