124 Chapter3
Manual Adjustment Procedures
3. DC Log Amplifier Adjustments
4. Set up an 3335A as follows:
Frequency ..................................................................... 15MHz
Amplitude ................................................................... −18dBm
5. Press
CAL, ADJ CURR IF STATE, wait for the analyzer to complete
adjustments then press
MKR.
6. Adjust A4R445 for maximum on-screen amplitude. Refer to Figure
3-10 on page 123 for the location of A4R445.
A4 Linear Fidelity Adjustment
1. Press LINE to turn the spectrum analyzer off. Remove the spectrum
analyzer cover and place the spectrum analyzer in the service
position as illustrated in Figure 3-9 on page 122. See Figure 3-10 on
page 123 for adjustment location.
2. Connect the 3335A 50Ω output to the spectrum analyzer 50Ω input.
Press
LINE to turn the spectrum analyzer on.
3. Press
PRESET AMPLITUDE, LINEAR, MORE 1 of 3, AMPTD UNITS, dBm,
CAL, IF ADJ ON OFF (OFF).
4. Press
PEAK SEARCH, MARKER DELTA.
5. Reduce the 3335A input power to −58 dBm.
6. If the delta marker amplitude reads −40 dB ±2 dB, no adjustment is
necessary.
7. If the signal is lower on the screen than expected ( delta marker
amplitude reads less than −42dB) then adjust A4R544 (see Figure
3-10 on page 123) for an even lower level and press CAL, ADJ CURR
IF STATE. Allow sufficient time for the analyzer to complete the
adjustment.
8. If the signal is higher on the screen than expected ( delta marker
amplitude reads greater than −38 dB) then adjust A4R544 for an
even higher level signal and press
CAL, ADJ CURR IF STATE. Allow
sufficient time for the analyzer to complete the adjustment.
9. Repeat steps 5 through 10.
A4 LOG Fidelity Adjustment
1. Press LINE to turn the spectrum analyzer off. Remove the spectrum
analyzer cover and place the spectrum analyzer in the service
position as illustrated in Figure 3-9 on page 122. See Figure 3-10,
“DC Log Adjustment Locations,” for adjustment location.
2. Connect the 3335 50Ω output to the spectrum analyzer 50Ω input.
Press
LINE to turn the spectrum analyzer on.
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