Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 302)

18. RF Module Phase Lock Adjustments

6. Connect the DVM to

A6A9AlE5,

and connect the DVM ground to

the metal case/shield of the

A6A9

Phase Lock Assembly. Refer to

Figure 3-82 for the location of

A6A9AlE5

and

A6A9AlE6.

7. Note the DVM indication at

A6A9AlE5.

Voltage at A6A9AlE5:

Vdc

8. Connect the DVM to A6A9AlE6, and note the DVM indication.

Voltage at A6A9AlE6:

Vdc

9. Add the voltage measured in step 7 to the voltage measured

in step 8. The absolute value of the resulting sum should be

less than 0.20 Vdc. If the resulting sum is greater than 0.20

Vdc, suspect a failure of

A6A9Ul

Sampler or related circuit

components.

Note

The voltage at

A6A9AlE5

should fall in the range of -0.55 Vdc and

-0.85 Vdc, and the voltage at

A6A9AlE6

should fall in the range

of 0.55 Vdc to 0.85 Vdc. If either of the voltages at

A6A9AlE5

and

A6A9AlE6

do not fall within these ranges, change the value

of factory-select component

A6A9AlR5.

Decreasing the value

A6A9AlR5

decreases the magnitude of the voltages at both

A6A9AlE5

and

A6A9AlE6.

Conversely, an increasing the value

A6A9AlR5

increases the magnitude of the voltages at both

A6A9AlE5

and

A6A9AlE6.

Refer to

Table

3-3 for the acceptable

range of values for

A6A9AlR5,

and to

Table

3-4 for HP part numbers.

Refer to Figure 3-82 for the location of

A6A9AlR5.

For example, if the voltage measured at

A6A9AlE5

is -0.87 Vdc and

the voltage measured at

A6A9AlE6

is 0.86 Vdc, then the absolute

value of the resulting sum is -0.87 + 0.86 = 0.01 Vdc. Since the

resulting sum is less than 0.20 Vdc, the

A6A9Ul

Sampler is probably

not faulty. For this example, the value of

A6A9AlR5

should be

reduced to decrease the magnitude of both measured voltages to

within the recommended ranges. The magnitudes of the voltages

measured at

A6A9AlE5

and

A6A9AlE6

are:

Voltage at

A6A9AlE5

= -0.87 = 0.87 Vdc

Voltage at

A6A9AlE6

= 0.86 = 0.86 Vdc

10. Verify that the loaded value of factory-select resistor

A6A9AlR27

56.2K

ohms. Refer to Figure 3-82 for the location of

A6A9AlR27.

Note

Factory-select resistor

A6A9AlR27

must be loaded with a value of

56.2K

ohms for proper operation of the HET UNLOCK Detector circuit

in HP 85660B RF Sections

(A6A9

Phase Lock Assembly HP Part

Number 85660-60226 and 85660-60256). A6A9AlR27 must be loaded

with a value of

10K

ohms for use in HP 85660A RF Sections.

11. Set the spectrum analyzer LINE switch to STANDBY.

3-162 Adjustments

1 2 ... 297 298 299 300 301 302 303 304 305 306 307 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 302

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