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Adjustment Procedures
5-34
2715 Spectrum Analyzer Service Manual
Use the following procedure to adjust R160 and R172 on the Log board.
H Test equipment required:
Sweep Generator
N male to N male coaxial cable
HP11852 or equivalent 50 – 75Ω min loss pad
1. Recall factory default power up settings by pressing UTIL 1 1.
2. Connect the Sweep Generator output to the RF INPUT as follows:
H Option 50 instruments - Connect the Sweep Generator to the RF INPUT.
H All instruments except Option 50 - Connect the Sweep Generator to the
RF INPUT using the HP11852 or equivalent 50 - 75 Ω min loss pad.
Refer to Figure 5--10.
To 2715
N Female to
BNC
75Ω-Male
HP11852 or Equivalent
50 -- 75 Ω Min loss Pad
Signal Generator
RF Output
Figure 5- 10: Flatness adjustment test setup (all instruments except Option 50)
3. Select the following settings on the Spectrum Analyzer:
FREQUENCY 100 MHz
REF LEVEL --20 dBm
4. Press SWEEP ↑ three times. Check that R160 and R172 on the Log board
(Figure 5--11) are set fully counterclockwise.
5. Preset R160 and R172 on the Log board as shown in Figure 5--11.
Flatness Adjustment