MODEL8559A

OPERATION

 

spectrum analyzer is calibrated for absolute amplitude and frequency measurements. Set the controls as shown in Table 1 before you start the adjustment procedure.

TABLE 1. ADJUSTMENT SElllNGS

Press and release the PLOT GRAT push button four times to step to digital test routine #4, as indicated by the "#4" displayed on the left side of the CRT.

With an adjustment tool, adjust the FOCUS

Function

Spectrum Analyzer Plug-In

INPUT ATTEN (dB)*

REFERENCE LEVEL Option 002

REF LEVEL FINE Amplitude Scale

FREQ SPANIDIV

RESOLUTION BW

SWEEP TIMEIDIV

SWEEP TRIGGER

START-CENTER

(8558B, 8557A) FREQUENCY BAND GHz

(8559A) TUNING BASELINE CLIPPER VIDEO FILTER

*On older plug-ins, set

OPTIMUM INPUT to

-30 dBm.

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HP 853A Spectrum Analyzer Display

TRACE A

TRACE B

DGTL AVG

INPUT-B+ A

HP 180-Series Display

Mainframe

DISPLAY MAGNIFIER SCALE (1 80TR, l82T) PERSISTENCE(1 81T/TR) Display Mode (1 81 TITR)

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Setting

10dB 0 dBm

+50 dBmV

0 dBm

LIN

10 MHz (uncoupled)

1 MHz (uncoupled)

AUTO

FREE RUN

CENTER

>60 MHz

OFF

OFF

WRITE

STORE BLANK

OFF

OFF

INT

X1 OFF MIN

WRITE

control as necessary to make the characters on the CRT as clear as possible.

Adjust the X POSN and Y POSN controls the align the square trace pattern with the outermost CRT graticule lines.

Momentarily press the PLOT GRAT and PLOT TRACE push buttons simultaneously to exit the digital test routines.

3-30. Display Adjustments - HP 180-SeriesDisplay Mainframe

1.With an adjustment tool, adjust the VERTI- CAL POSN control to place the CRT trace on a horizontal graticule line near the CRT center.

2.Reduce the INTENSITY and set the SWEEP TIME/DIV control to MAN. Use the MAN SWEEP knob to center the CRT dot.

Leaving a dot on the CRT for pro- longed periods at high intensity can burn the phosphor.

3.Adjust FOCUS and ASTIG controls for the smallest round dot possible.

4.Reset the SWEEP TIME/DIV control to AUTO and increase the INTENSITY for an optimum CRT trace. Adjust the HORIZON- TAL POSITION control to center the CRT trace. If the horizontal deflection is not exactly 10 divisions, adjust the HORIZ GAIN control located on the rear panel of the spectrum ana- lyzer plug-in.

NOTE

3-29. Display Adjustments- HP 853A Spectrum Analyzer Display

1.Switch LINE power OFF then ON while hold- ing PLOT GRAT push button depressed to activate the digital test routines. The "#O" that appears on the left side of the CRT means digi- tal test routine #O is now activated.

To adjust the HORIZ GAIN, you must switch the LINE power OFF, then remove the spectrum analyzer plug-in from the mainframe.

5.Adjust TRACE ALIGN so that the CRT traceis parallel to the horizontal graticule line.