MODEL 8559A

ADJUSTMENTS

ADJUSTMENTS

5-27. THIRD CONVERTER ADJUSTMENTS(Cont'd)

PROCEDURE:

1.Allow one-'lalf hour warmup time of equipment with analyzer connected to mainframe with extender cable.

Third LO Adjustment

2.Connect frequency counter to AlOJl 300 MHz output using the BNC t o SMB test cable.

3.Adjust AlOL12 LO ADJ for frequency counter indication of 300.00 MHz +0.1 MHz.Second IF BandpassFilter Alignment4.Disconnect blue cable AlOWl at second converter output connector A5J2.

5.Set sweep oscillator controls for an output of 321.4 MHz at 0 dBm (measured directly at output of sweep oscillator). Use the frequency counter and spectrum analyzer to set the output frequency and amplitude.

6.

7.

Connect output through 10 and 20 dB attenuators t o cable disconnected in step 4, using the BNC to SMB test cable and SMB male to SMB male adapter.

Place analyzer on right side and connect test cable to Third Converter 21.4 MHz output connector. If connector is not present (some early instruments were not so supplied), it is necessary to solder a coaxial cable to XAlOPl pin 18and ground (center conductor of coaxial cable to XAlOPl and shield to ground).

8.Connect test cable or soldered cable to 8569B spectrum analyzer input.9.Set 8569B spectrum analyzer controls as follows:

TUNING ...............................................................

21.4 MHz
RESBW .................................................................300kHz

FREQ SPAN/DIV .....................................................

1 MHz/DIV

INPUTATTEN .............................................................

10dB

REF LEVEL dBm ........................................................

- 10 dBm

Amplitudescale ........................................................

10dBLOG

TIME/DIV ..........................................................

1 mSEC/DIV
10.Set H P 8559A RES BW to 1 kHz and TRIGGER to FREE RUN.

11.Center the 21.4 MHz signal on the 8569B spectrum analyzer, adjust reference level to place signal within top division on CRT, then change scale to 1 dB/DIV. Adjust REF LEVEL FINE to place signal peak in upper half of display.

12.Set function generator controls for a 200 Hz triangle wave output and connect to sweep oscillator RF Plug- In rear-panel FM input. Set FM/NORM/PL switch to FM.