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

Adjustment Procedures
4. IF Amplitude Adjustments

A5 Reference Attenuator Adjustment

1. Set the HP 3335A
2. Connect a BNC cable between the 50 Ω output of the HP 3335A and
the HP 8560E/EC INPUT 50 Ω.
3. On the HP 8560E/EC, press
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 HP 8560E/EC, press
the spectrum analyzer reference level to −10 dBm.
5. Change the HP 3335A
6. On the HP 8560E/EC, 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 HP 8560E/EC, press
amplitude reading.
10.Set the HP 8560E/EC reference level to −60 dBm and press
.
MARKERS OFF
11.Repeat steps 12 through 21 until the ∆MKR amplitude reading is
50.00 dB ±0.1 dB.
A5 Adjustment Verification
1. On the HP 8560E/EC, disconnect W29 from A5J3. Connect the test
cable between A5J3 and the 50 Ω output of the HP 3335A.
2. Set the HP 8560E/EC reference level to −10 dBm.
3. Set the HP 3335A
4. On the HP 8560E/EC press
5. The MARKER amplitude should read −10 dBm ±0.13 dB. If the
reading is outside of this range, repeat steps 3 through 21.
78
to −60 dBm.
AMPLITUDE
and
CAL REF LEVEL ADJUST
PEAK SEARCH
to −10 dBm.
AMPLITUDE
.
CAL
ADJ CURR IF STATE
to −5 dBm.
AMPLITUDE
and
MKR MARKER NORMAL
. Use the
and . Set
MARKER DELTA
. Note the ∆MKR
MKR
.
Chapter 2
and