HP 8568B manual Time Base Adjustment SN 2848A to 3217A05567

12. Time Base Adjustment (SN 2848A to 3217A05567)

12.Time Base Adjustment (SN 2848A to 3217A05567)

Reference

Related Performance Test

Description

RF Section:

A27Al Frequency Standard Regulator

A27A2 10 MHz Quartz Crystal Oscillator

Center Frequency Readout Accuracy Test

The frequency of the internal 10 MHz Frequency Standard is compared to a known frequency standard and adjusted for minimum frequency error. This procedure does not adjust the short-term stability or long-term stability of the 10 MHz Quartz Crystal Oscillator, which are determined by characteristics of the particular oscillator and the environmental and warmup conditions to which it has been recently exposed. The spectrum analyzer must be ON continuously (not in STANDBY) for at least 72 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the oscillator to stabilize.

14FREPUENCY STANDARD

Figure 3-54. Time Base Adjustment Setup

Equipment Frequency Standard . . . . . . . . . . . . . . . . . . . . . . . . HP 5061A/B Frequency Counter . . . . . . . . . . . . . . . . . . . . . . . . . HP 5334A/B

Cables:

BNC cable, 122 cm (48 in) (2 required) . . . . . . . . HP 10503A

Procedure

Note The spectrum analyzer must be ON continuously (not in STANDBY) for at least 72 hours immediately prior to oscillator adjustment. This allows both the temperature and frequency of the oscillator to stabilize. Adjustment should not be attempted before the oscillator is allowed to reach its specified aging rate. Failure to allow sufficient stabilization time could result in oscillator misadjustment.

Adjustments 3-99