I
a
4
«
410 PRINT @A9:“TUN 5M;SIG;WAI”
420 PRINT @A9:“TUN -5M;SIG;WAI’
430 GO TO 410
500 REM *** ADJUST FINE TUNE RANGE R4040 CEN FRE CON BRD ***
510 PRINT @A9:“TUN 2M;SIG;WAI’
520 PRINT @A9:“TUN -2M;SIG;WAI’
530 GO TO 510
600 REM *** ADJUST FINE TUNE SENSITIVITY R3040 CEN FRE CON BRD ***
610 PRINT @A9:*TUN 2K;SIG;WAI’
620 PRINT @A9:“TUN -2K;SIG;WAI"
630 GO TO 610
700 REM *** START UP PROCEDURE ***
710 PAGE
720 PRINT “ENTER THE 492P’S GPIB PRIMARY ADDRESS’ ;
730 INPUT A9
740 POLL Z8,Z9;A9
750 RETURN
Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Adjustment Procedure
7. Adjust 1 st Converter Bias
NOTE
This adjustment should only be necessary if frequency
response problems are encountered.
a. Switch the FREQUENCY RANGE control to the
3.0—7.1 GHz band. Adjust Bias 1 (R1043) on the 1st LO
Driver (Fig. 3-34) for 0.25 V at TP1011.
b. Switch the FREQUENCY RANGE to the 5.4—18 GHz
band. Adjust Bias 2 (R1022) for 0.25 V at TP1011.
Fig. 3-34. 1 st LO Driver adjustments and test point locations.
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