Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 247)

100

101

12. 10

MEtz

Standard Adjustment (SN 2637A and Below)

14. Remove the two adjustment cover screws from the A22 10 MHz

Frequency Standard. Refer to Figure 3-53 for the location of the

A22 10 MHz Frequency Standard.

Note

Do not use a

metal

adjustment tool to tune an oven-controlled

crystal oscillator (OCXO). The metal will conduct heat away from the

oscillator circuit, shifting the operating conditions.

A22

10 MHz

/Standard

TOP

VIEW

Figure 3-53. Location of 10 MHz Standard Adjustments

15. Use a nonconductive adjustment tool to adjust the

16-turn

FINE

frequency adjustment on the A22 10 MHz Frequency Standard for

a Frequency Counter indication of 0.00 Hz. If the FINE frequency

adjustment has insufficient range, center the adjustment and

then adjust the COARSE frequency adjustment for a Frequency

Counter indication of 0.00 Hz.

16. On the Frequency Counter, select a 10 second gate time by

pressing

(GATE)

C-1.

The Frequency Counter

should now display the difference between the frequency of the

INPUT A signal and 10.0 MHz with a resolution of 0.001 Hz (1

mHz).

17. Wait at least 2 gate periods for the Frequency Counter to settle,

and then adjust the 16-turn FINE adjustment on the A22 10 MHz

Frequency Standard for a stable Frequency Counter indication of

(0.000 + Frequency Correction Factor)

f0.010

Hz.

18. Replace the two adjustment cover screws on the A22 10 MHz

Frequency Standard.

19. Replace the RF Section bottom cover and reconnect the short

jumper cable between the FREQ REFERENCE INT and EXT

connectors.

Adjustments 3-107

1 2 ... 242 243 244 245 246 247 248 249 250 251 252 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 247

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