HP E42 manual Sensitivity Adjustments

Model 5328A

Maintenance

5 - 22 . ADJUSTMENTS

5-23. Adjustment procedures are provided for the oscillator and for the time interval unit (sensitivity). The adjustments should not be done unless:

a.A trouble has been repaired which would affect these values.

b.The instrument does not meet all specifications while performing the check in Table 5-4(Performance Test), or during periodic calibration.

5-24. OSCILLATOR ADJUSTMENT. Periodically, the oscillator should be checked against a house standard. When adjustment is required, use the oscilloscope method shown in Figure 5–2.Using the appropriate sweep speed, adjust the oscillator until the movement of the pattern is stopped or nearly stopped.

NOTE

When adjusting the 5328A oscillator, adjust FREQ ADJ on the 10544A crystal oscillator unit, and the fine tuning adjustment A3R14.

Figure 5-1.10 MHz Oscillator Frequency Check

5-25.Sensitivity Adjustments

1.Adjust the channels A and B sensitivity as follows:

a.Remove top cover of 5328A to gain access to variable resistors R28 and R26 on the A12 Amplifier Assembly (see location photo in Section VIII),

b. Set 5328A front panel controls as follows:

FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FREQ A

RESOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lIY, 10 Hz

SLOPE (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+

AC/DC (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC

ATTEN (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

LEVEL (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRESET

SEP-COM A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SEP

SAMPLE RATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIDRANGE

5-19