CALI BRATION
The power meter contains 690 correction factors, stored in PROM.
The 150 "power vs power" correction factors compensate for variations from square law in the detector
and power meter circuits. They are divided into three tables. The first table corrects variations below
10
GHz. The second corrects variations between 10 and 20 GHz. The third corrects variations above
20
GHz.
The 540 "power vs frequency" correction factors compensate for variations in the detector output at
different frequencies. "Power vs frequency" corrections cover 0-27
GHz every 50 MHz.
The power meter
is
calibrated at the factory using specialized automatic test equipment. Because of the
accuracy required, recalibration in the field is not recommended. If, however, recalibration
is
required,
use the procedures given herein.
The test equipment required for calibration
is:
CAUTION
MFG
H.
P.
Wavetek
Wiltron
Be sure all connections are clean
and tight. Loose or dirty connections
will cause calibration errors.
1. Duplicate the power meter PROM, zeroing all corrections (address 0000-0282 in the PROM). Install
the uncorrected PROM in the counter.
MODEL
435A
2002
6100
2.
Set the Wavetek to 2
GHz
+I
MHz. Connect the Wavetek to band 3 of the counter. Adjust the output
until the counter reads -35
d8m.
on 6100
3.
Connect Wavetek to the power meter. Subtract the counter reading from the power meter reading.
Round the result
(R1) to 0.1 dBm.
DESCRIPTION
Power Meter
Sweeper
Microwave Sweeper
4.
Using the following formulas, justify the correction to a number between 10 and 20.
CRITICAL PARAMETERS
Measures -30 to +15
dBm
950 MHz
-
2
GHz
2GHz- 18GHz
Microwave Sweeper
PROM Programmer
int
(R1) -1
=
N
;
(int (R 1)
=
Whole number portion of R1)
18 GHz
-
26.5 GHz
Programs TI 2516 PROMS
10 (R
1
-N)
=
CORR
i
o
Convert CORR
lo
(decimal)
-+
CORR
16
(hexidecimal)
(R
1
is
the result of step 3.)
Scans by ArtekMedia © 2007
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