Agilent Technologies 856290216 service manual Supplied with HP 8481D

15. External Mixer Amplitude Adjustment (Non-Option 327)

Equipment

Synthesized sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8340A/B Measuring receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8902A Power sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8481D 50 MHz reference attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11708A

(supplied with HP 8481D)

Adapters

Type N (f) to SMA (f) . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1772 Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476 Type APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5061-5311

Cables

BNC,122cm (48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A SMA,61cm(24in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...8120-1578

Procedure

1.Press LuNE) to turn the spectrum analyzer off and disconnect the power cord. Remove the spectrum analyzer cover and reconnect the power cord.

2.Set up the equipment as illustrated in Figure 2-24. Do not connect the SMA cable to the spectrum analyzer.

3.Move the WR PROT/WR ENA jumper on the A2 controller assembly to the WR ENA position. The jumper is on the edge of the A2 board assembly and can be moved without folding the board down.

4.Press [LINE) to turn the spectrum analyzer on. On the spectrum analyzer, press c-1, EXT MXR PRE UEFR , (UNPR), (mCTRL), EXTERNAL MIXER , BMPTD CORRECT , then CNV LDSS VS FREq .

5.Press @ or a to display the conversion loss value for each frequency listed in Table 2-12. Record any conversion loss reading not equal to 30 dB in Table 2-12 at the appropriate frequency.

6.If all conversion loss values equal 30 dB, skip to step 7, otherwise continue to step a.

a.Refer to Table 2-12 and press m or a to select a frequency at which the conversion loss value does not equal 30 dB.

b.Use the spectrum analyzer front-panel keys to set the conversion loss value to 30 dB.

c.Repeat steps a and b for all frequencies having a conversion loss value other than 30 dB.

7.Press (INSTR PRESET) on the HP 8340A/B and set the controls as follows:

CWfrequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310.7MHz Power level . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 dBm

2-58 Adjustment Procedures