A5 Reference Attenuator Adjustment; A5 Adjustment Verification - HP 8560E Service Manual

10.Repeat step 7 through
±0.1 dB.
11.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.

A5 Reference Attenuator Adjustment

1. Set the HP E4421B
2. Connect a BNC cable between the RF output of the HP E4421B and
the spectrum analyzer INPUT 50Ω.
3. On the spectrum analyzer, press
the front panel knob or step keys to place the peak of the displayed
signal 3 dB to 5 dB below the reference level.
4. On the spectrum analyzer, press
Set the spectrum analyzer reference level to −10 dBm.
5. Change the HP E4421B
6. On the spectrum analyzer, press
7. Note the ∆MKR amplitude. Ideally, it should read 50.00 dB ±0.1 dB.
8. If the ∆MKR amplitude is less than 49.9 dB, rotate A5R343 (15 dB
ATTEN) one-half turn counterclockwise for each 0.1 dB less than
50.00 dB. If the ∆MKR amplitude is greater than 50.1 dB, rotate
A5R343 one-half turn clockwise for each 0.1 dB greater than
50.00 dB. Do not adjust A5R343 more than five turns before
continuing with the next step.
9. On the spectrum analyzer, press
amplitude reading.
10.Set the spectrum analyzer reference level to −60 dBm and press
and
MARKERS OFF
11.Repeat step 1 through
50.00 dB ±0.1 dB.
A5 Adjustment Verification
1. On the spectrum analyzer, disconnect W29 from A5J3. Connect the
test cable between A5J3 and the RF output of the HP E4421B.
2. Set the spectrum analyzer reference level to −10 dBm.
3. Set the HP E4421B
4. On the spectrum analyzer press
5. The MARKER amplitude should read −10 dBm ±0.13 dB. If the
reading is outside of this range, repeat
through step 10, on page
Chapter 2
Adjustment Procedures: HP 3335A Source not Available
until the marker reads −60 dBm
step 9
to −60 dBm.
AMPLITUDE
and
CAL
PEAK SEARCH
to −10 dBm.
Amplitude
.
CAL
ADJ CURR IF STATE
.
until the ∆MKR amplitude reading is
step 10
to −5 dBm.
Amplitude
and
MKR
step 3, on page 2a-136
2a-137.
4a. IF Amplitude Adjustments
. Use
REF LEVEL ADJUST
and
MARKER DELTA
. Note the ∆MKR
.
MARKER NORMAL
.
MKR
137