Agilent Technologies 85037A, Operating And Service Manual

Page: 40 / 74

Dynamic P o w er
Accuracy
Description
The dynamic p o w er accuracy of the 85037A/B is dep endent up on the
raw (uncorrected) resp onse of the detector, the correction routine
of the 8757D analyzer, and the accuracy of the 8757D Option 002
calibrator. The accuracy of the calibrator is assumed to b e within
sp ecications. This can b e c hec k ed b y follo wing the p erformance test
pro cedure in the 8757D man ual. The correction routine is xed and
cannot v ary , so it is also assumed to b e accurate. The high accuracy
of the 85037A/B is only guaranteed after p erforming the built-in
c haracterization routine (a p o w er cal) in the 8757D. Once this is
done, p erforming an y dynamic accuracy tests using the same 8757D
calibrator is ineectual b ecause the only error that will b e seen will
b e due to measuremen t rep eatability and an y p ossible temp erature
drift. Therefore, to v erify the dynamic accuracy of the 85037A/B,
only the raw, uncorrected p erformance is measured. Once this has
b een v eried, the corrected dynamic accuracy , b y design, m ust b e
within sp ecication. Indep enden t v erication of b oth corrected and
uncorrected sp ecications can b e p erformed b y using either of the
t w o alternativ e setups sho wn in Figure 4-5 or Figure 4-6 . T esting of
the raw dynamic accuracy p erformance is the only test required. The
man ual test pro cedure follo ws.
Procedure
1. Connect the equipmen t as sho wn in Figure 4-4 . If the sw eep er is
on, turn it o.
2. Allow equipmen t to w arm up for 30 min utes.
3. Disconnect the detector.
4. Press 4 PRESET 5.
5. Reconnect the detector to input A, this forces default correction.
6. Press Channel 4
2
5 4
2
5 (Pressing t wice turns Channel 2 o ).
7. Press 4 SYSTEM 5.
8.
Select
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SWEEP MODE
NNNNNNNNNNNNNNNNN
CW ON .
9.
Press 4
CAL
5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DET OFFSET
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MEASURE DET OFS
NNNNNNNNNNNNNNNNN
DET A
4 0 5 4 dBm 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
START MEAS . Read the oset v alue. Note this n um b er
as the reference v alue.
10. Press 4 CAL 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PRIOR MENU 4 19 5 4 dBm 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
START MEAS .
11. Read the oset v alue sho wn on the 8757D and subtract from
this the reference v alue in step 9. Record the results on the test
record card under Dynamic Accuracy A C Mo de.
12. Repeat steps 10 and 11 at the p o w er lev els sho wn on the test
record.
4-10 P erformance T ests