Chapter 2 137
Adjustment Procedures: HP 3335A Source not Available
4a. IF Amplitude Adjustments
10.Repeat step 7 through step 9 until the marker reads −60 dBm
±0.1 dB.
11.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.
A5 Reference Attenuator Adjustment
1. Set the HP E4421B AMPLITUDE to −60 dBm.
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
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 spectrum analyzer, press
PEAK SEARCH and MARKER DELTA.
Set the spectrum analyzer reference level to −10 dBm.
5. Change the HP E4421B Amplitude to −10 dBm.
6. On the spectrum analyzer, 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 spectrum analyzer, press
ADJ CURR IF STATE. Note the ∆MKR
amplitude reading.
10.Set the spectrum analyzer reference level to −60 dBm and press MKR
and MARKERS OFF.
11.Repeat step 1 through step 10 until the ∆MKR amplitude reading is
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
Amplitude to −5 dBm.
4. On the spectrum analyzer 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 step 3, on page 2a-136
through step 10, on page 2a-137.
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