78 Chapter2
Adjustment Procedures
4. IF Amplitude Adjustments
A5 Reference Attenuator Adjustment
1. Set the HP 3335A AMPLITUDE to −60 dBm.
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
CAL and REF LEVEL ADJUST. Use 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 HP 8560E/EC, press
PEAK SEARCH and MARKER DELTA. Set
the spectrum analyzer reference level to −10 dBm.
5. Change the HP 3335A AMPLITUDE to −10 dBm.
6. On the HP 8560E/EC, press
CAL.
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
ADJ CURR IF STATE. Note the ∆MKR
amplitude reading.
10.Set the HP 8560E/EC reference level to −60 dBm and press MKR and
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
AMPLITUDE to −5 dBm.
4. On the HP 8560E/EC press
MKR and MARKER NORMAL.
5. The MARKER amplitude should read −10 dBm ±0.13 dB. If the
reading is outside of this range, repeat steps 3 through 21.
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