Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 245)

12. 10 MHz Standard Adjustment (SN 2637A and Below)

message should typically appear on the spectrum analyzer display for

10 minutes or less after line power is first applied to the RF Section.

Note

The rear-panel FREQ REFERENCE switch enables or disables the RF

Section +20 Vdc switched supply, which powers the oscillator circuits

in the A22 10 MHz Frequency Standard. This switch must be set to

INT and the spectrum analyzer must be switched ON continuously

(not in STANDBY) for at least 72 hours before adjusting the frequency

of the A22 10 MHz Frequency Standard.

2. Set the LINE switch to ON. Leave the spectrum analyzer ON

(not in STANDBY) and undisturbed for at least 48 hours to allow

the temperature and frequency of the A22 10 MHz Frequency

Standard to stabilize.

Note

‘lb prolong CRT life, press

ISHIFT) [CLEAR-WRITES

to turn off the CRT

display while the spectrum analyzer is unattended, and

(m’

[my

to turn the CRT back on.

3. Connect the (Cesium Beam) Frequency Standard to the Frequency

Counter rear-panel

TIMEBASE

IN/OUT connector as shown in

Figure 3-52.

IMBASE

FREQUENCY

COUNTER

IN/OUT

FREQUENCY

STANDARD

Figure 3-52. 10 MHz Frequency Standard Adjustments Setup

4. Disconnect the short jumper cable on the RF Section rear panel

from the FREQ REFERENCE INT connector. Connect this output

(FREQ REFERENCE INT) to INPUT A on the Frequency Counter.

A REF UNLOCK message should appear on the CRT display.

5. Set the Frequency Counter controls as follows:

FUNCTION/DATA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FREQ A

INPUT A:

x10ATTN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

..OFF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF (DC coupled)

500

Z . . . . . . . . . . . . . . . . . .

.OFF

input impedance)

AUTO TRIG

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ON

100

kHz

FILTER A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF

INT/EXT switch (rear panel) . . . . . . . . . . . . . . . . . . . . EXT

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

pressing

C-TIME)

10 [GATE).Offset the displayed

frequency by -10.0 MHz by pressing MATH (SELECT/ENTER

(CHS/EEX)

C-1

6 @ELECT/ENTER) (SELECT/ENTER).

T!te

Adjustments

3.105

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 245

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