Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 176)

100

101

2. High-Voltage Adjustment (SN 3001A and Below)

then set the LINE switch to ON (the INSTR CHECK I LED will

light.)

30. Wait approximately 30 seconds for the dc regulator circuits to

stabilize again.

31. With the front-panel INTENSITY control fully counter clockwise,

adjust AlA2R35 INT LIMIT (clockwise) until a spot is just visible

in the lower left corner of the CRT. See Figure 3-8 for the location

of the adjustment.

Note

The AlA2R35 INT LIMIT adjustment compensates for the variation

in beam cut-off voltage of different

CR’&

and indirectly sets the

maximum beam intensity. AlA2R35 INT LIMIT should have enough

range to turn the CRT spot on and off. If the spot is always on,

decrease the value of

AlA2R9.

If the spot is

always

off, increase

the value of

AlA2R9.

Refer to

%ble

3-3 for the acceptable range of

values, and to

Table

3-4 for HP part numbers. Refer to Figure 3-8 for

the location of

AlA2R9.

R35 R5

R36

INT I NT

ASTIG

LIMIT GAIN

-I

Figure 3-8. Location of

AlA

Components

32. Using a non-metallic alignment tool, center the front panel FOCUS

control and adjust AlA2R36 ASTIG and AlA3R14 FOCUS LIMIT

for a sharp, focused dot on the CRT display.

33. Adjust AlA2R35 INT LIMIT until the dot just disappears.

34. On the oscilloscope, adjust the channel 1 offset voltage as

necessary to measure the peak-to-peak CRT cut-off voltage, V,,,

AlA3TP5.

See Figure 3-9. This peak-to-peak voltage should be

between 45-75 V,-,. Note this voltage for use in step 39.

CO:

3-36 Adjustments

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 176

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