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A5 Reference Attenuator Adjustment
1. Set the spectrum analyzer reference level to −60 dBm. If markers
are displayed, press
2. Set the E4421B
AMPLITUDE
3. Connect a BNC cable between the RF output of the E4421B and the
spectrum analyzer INPUT 50Ω .
4. On the spectrum analyzer, press
panel knob or step keys to place the peak of the displayed signal
3 dB to 5 dB below the reference level.
5. On the spectrum analyzer, press
Set the spectrum analyzer reference level to −10 dBm.
6. Change the 4421B
7. On the spectrum analyzer, press
8. Note the ∆MKR amplitude. Ideally, it should read 50.00 dB ±0.1 dB.
9. 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. Do not adjust A5R343 more than five turns before
continuing with the next step.
10.If the ∆MKR amplitude is greater than 50.1 dB, rotate A5R343
15 dB ATTEN 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.
11.On the spectrum analyzer, press
∆MKR amplitude reading.
12.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 E4421B.
2. Set the spectrum analyzer reference level to −10 dBm.
3. Set the E4421B
Amplitude
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
165
through
"A5 Reference Attenuator Adjustment" step
Chapter 3
Manual Adjustment Procedures: 3335A Source not Available
and
MKR
MARKERS OFF
to −60 dBm.
and
CAL
PEAK SEARCH
to −10 dBm.
Amplitude
.
CAL
ADJ CURR IF STATE
until the ∆MKR amplitude reading is
step 11
to −5 dBm.
and
MKR
step 4
2a . IF Amplitude Adjustments
.
. Use the front
REF LVL ADJ
and
MARKER DELTA
. Note the
.
MARKER NORMAL
of
"Procedure" on page
12.
.
167
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