HP 8559A -30 dB potentiometer A14R69 for DVM reading ( t 1 mV), -10 dB potentiometer A14R39 for DVM reading ( t 1 mV)

MODEL 8559A ADJUSTMENTS

ADJUSTMENTS

5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd)

Disconnect signal generator output from step attenuator. Adjust spectrum analyzer VERTICAL POSN control to position signal trace at bottom CRT graticule line. Measure dc offset voltage at Al5TP1 and record.

Connect signal generator to step attenuator and adjust signal generator FINE TUNE control t o peak signal on CRT display.

Adjust signal generator OUTPUT LEVEL for digital voltmeter (DVM) reading ( t 1 mV) of 800 mV plus offset recorded in step 4, as measured at AlSTPl. Adjust spectrum analyzer VERTICAL GAIN control to position signal trace at top graticule line.

Set spectrum analyzer Amplitude Scale control to 10 dB/DIV.

Set 10-dB step attenuator to 0 dB and adjust SLOPE potentiometer A14R23 for DVM reading (k1 mV) of 800 mV plus offset recorded in step 4, as measured at Al5TPl.

Set 10-dB step attenuator to 60 dB and adjust OFFSET potentiometer A14R10 for DVM reading (+1 mV) of 200 mV plus offset recorded in step 4, as measured at A15TP1.

Repeat steps 8 and 9 until no further adjustment is necessary.

Set 10-dB step attenuator to 30 dB and adjust SLOPE potentiometer A14R23 for DVM reading (k1 mV) of 500 mV plus offset recorded in step 4, as measured at Al5TPl.

Set 10-dB step attenuator to 60 dB and adjust OFFSET potentiometer A14R10 for DVM reading (+1 mV) of 200 mV plus offset recorded in step 4.

Repeat steps 11 and 12 until no further adjustment is necessary.

Set 10-dB step attenuator to 10 dB and adjust of 700 mV plus offset recorded in step 4.

Set 10-dB step attenuator to 0 dB and adjust of 800 mV plus offset recorded in step 4.

-30 dB potentiometer A14R69 for DVM reading ( t 1 mV)-10 dB potentiometer A14R39 for DVM reading ( t 1 mV)

Set 10-dB step attenuator to 60 dB and adjust OFFSET potentiometer A14RlO for DVM reading ( t 1 mV) of 200 mV plus offset recorded in step 4.

Set 10-dB step attenuator to 0 dB and adjust SLOPE potentiometer A14R23 for DVM reading ( t 1 mV) of 800 mV plus offset recorded in step 4.

Repeat steps 16 and 17 until no further adjustment is necessary.

Check log fidelity per Table 5-6. If test limits are not met, repeat steps 8 through 18.