HP 85662A Troubleshooting And Repair Manual page 56

Spectrum analyzer if-display section

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Focus Grid Charge Level Shift @

The focus voltage is set by a resistive divider string from the cathode, with an intensity-focus

correction bias developed in a manner similar to that of the control grid bias voltage described

above. FOCUS LIMIT potentiometer R14 sets the focus grid to approximately -2500 V dc,

and the focus bias is generated by a clipped sine wave at the junction of C9 and ClO. This

upper clipping level is set by VR2 (+82.5 V),

and the lower clipping level is set by the

FOCUS GATE voltage from AlA2.

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