HP 8568B ms, MHz, l-1, 0 dB, 0 Hz, [-BW), 1 kHz, Key in, - 1 0 dBm, 100 Hz, and, IF Gain Adjustment, 8.Press LIN pushbutton and MARKER (-1

10. Step Gain and 18.4 MHz Local Oscillator Adjustments

Equipment Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..HP436 A Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8481A 10 dB Step Attenuator . . . . . . . . . . . . . . HP 355D, Option H89 1 dB Step Attenuator . . . . . . . . . . . . . . . HP 355C, Option H25

Procedure 1. Position instrument upright as shown in Figure 3-46 and remove top cover.

2.The validity of the results of this adjustment procedure is based in part on the performance of the Log Amplifiers, the Video Processor, and the Track and Hold. These adjustments must be done before proceeding with the adjustment procedure of the Step Gain and 18.4 MHz Local Oscillator.

3.Set instrument LINE switch to ON and press ~NSTR PRESET). Connect CAL OUTPUT to RF INPUT.

4.Key in [CENTER FREQUENCY] 20 MHz, [ R E F E R E N C E L E V E L ] - 1 0 dBm, (ATTEN) 0 dB, [FREQUENCY SPAN) 0 Hz, [-BW) 1 kHz, l-1 100 Hz, and [SWEEP TIME) 20 ms.

IF Gain Adjustment

5.Disconnect cable 97 (white/violet) from A4A8Jl and connect cable to power meter/power sensor. Refer to Figure 3-47 for location of cable 97 and A4A8Jl.

6.Adjust front-panel AMPTD CAL adjustment for a power meter indication of -5 dBm.7.Disconnect power meter and reconnect cable 97 to A4A8Jl.8.Press LIN pushbutton and MARKER (-1.9.Note MARKER amplitude in mV and adjust A45A5R33 CAL to70.7mV (top CRT graticule line). See Figure 3-47 for location of adjustment.

	A4A7
3	MHz BANDWI D T H	A4A5
A4A8J 1	F I L T E R	S T E P G A I N

R33

C A L

\-w

A4A5

Figure 3-47. Location of IF Gain Adjustment

3-88 Adjustments