HP 8340B Manual page 196

8-7.
Low Output Power Accuracy Test and
RF
Attenuator Calibration
Description
This test:
•
Adjusts the instrument's attenuator calibration constants to compensate for errors
in
the
90 dB
step attenuator
(for
those instruments
equipped with
a
90 dB
step attenuator).
• Verifies
power accuracy
at each attenuator step.
• Sums
the attenuator performance data with output power accuracy data and compares the
results with the instrument's performance specifications.
NOTE: This test will not run unless the
IF
attenuator has been characterized (see section 6) and the
output
power
accuracy test has been run.
The
data
file
generated
for the IF
attenuator must be on disc
1,
and the data file for the output power accuracy test must be on the data disc you are
using.
Test Equipment
Local Oscillator
.....................................
HP 8340B Option H01
Spectrum Analyzer
........... ...............................
HP 3585A
Amplifier
.....................................................
HP 8447F
Step Attenuator
(Calibrated at 1
MHz)
..............................
HP 355D
Attenuators:
10 dB
..........................................
HP 8493C Option 010
20 dB
............................................
HP 8493C Option 020
Mixer
.............................................
HP Part No. 0955-0307
Low Pass Filter
.........
........................
HP Part No. 9135-0260
Adapters:
3.5
mm (f)-(f)1
...........
.........................
HP Part No. 5061-5311
3.5 mm
(0
-
Type-N
(m)2
...........................
HP Part No. 1250-1744
SMA (m)
-
BNC (f)
...............................
HP Part No. 1250-1200
Cables:
SMA
(m)-(m)
....................................
HP Part
No.
08340-20125
BNC (m)-(m) (7 Required)
............................
HP Part No. 8120-1840
1 Required for an HP 8340A/B
2
Required
for
an HP 8341A/B or 8340A H02
NOTE:
For
maximum
drive into
the mixer LO port, connect the mixer directly to the LO (local
oscillator) RF output.
NOTE:
The
test setup for the adjust and measure portions of the RF attenuator calibration
is
critical.
The
tests and adjustments are performed at low RF output power levels (to —90 dBm).
A
defective
cable or
adapter, or
a
loose cable connection
in
the test setup can cause
a
misadjustment of the
instrument or failure of the low output power accuracy test.
If
the
test results indicate that the instrument
failed low output
power accuracy, check
the test setup and re-run the selected test (either adjust or
measure).
Attenuator Calibration and Operation Verification Test Software
Tests/Utilities 8-9