OPERATION

MODEL 8559A

3-17.The frequency group enables the operator to control how the Spectrum Analyzer displays the frequency domain. The RESOLUTION BW and FREQ SPAN/DIV controls, when pushed in, are coupled together, and moving either control moves the other. When the SWEEP TIME/DIV control is in the AUTO position, varying the RESOLUTION BW or the FREQ SPAN/DIV (coupled or uncoupled) will change the sweep time to maintain calibration. With the two controls coupled together in the optimum position, RESOLUTION BW's of 3 MHz to 1 kHz will be automatically selected as the FREQ SPAN/ DIV is narrowed from F (Full) to 0 (Zero). TUNING controls coarse and fine (coarse is larger knob) set the center frequency of the displayed spectrum. RESOLUTION BW control determines the resolution of the signals on the CRT.

3-18. Amplitude. The amplitude group consists of:REFERENCE LEVEL dBmINPUT ATTEN REF LEVEL FINE REF LEVEL CAL10 dB/DIV - 1 dB/DIV - LIN (Amplitude Scale)

3-19. The amplitude group enables the operator to measure signal amplitude in units of either voltage or dBm.

3-20. OPERATING PRECAUTIONS3-21. Signal lnput

3-22. The HP 8559A Spectrum Analyzer plug-in is a sensitive measuring instrument. Overloading the input with too much power, peak voltage, or dc voltage will permaner:tly damage the input circuits. Do not exceed the input levels specified below:

Maximum lnput (Damage) LevelsHP 8559ATotal Power:+20 dBm (0.1W, 2.2 Vrms) with 0 dB input attenuation+30 dBm (1W, 7.1 Vrms) with 110 dB input attenuationdcorac(<100 Hz): k7.1V

Peak Pulse Power: +50 dBm (100W, >lOpsec pulse width, 0.01% duty cycle) with L30 dB input attenuation

NOTE

When you are measuring input signals of unknown power levels, a preliminary instrument setting of 1 3 0 dB INPUT AlTEN is recommended.

Although the spectrum analyzer'sref- erence level can be set for power levels up to +60 dBm, the total input power must not exceed the absolute maximum limits listed above.

3-23. Line Power On

3-24. Before connecting the line power cord, make sure the proper line voltage and line fuse have been selected for the display mainframe. Failure to set the ac power input selector on the display mainframe to correspond with the level of the ac source voltage could cause damage to the instrument when the power cord is plugged in.

The spectrum analyzer and any device connected to it must be connected to power line ground. Failure to ensure proper grounding could result in a shock hazard to personnel or damage to the instrument.

3-25.LINE power is switched at the display mainframe front panel. A safety indicator lights when the ac power is on. NEVER remove a spectrum analyzer plug-in from the display mainframe without first switching the ac LINE power switch to OFF

3-26. For optimum performance, you should allow the spectrum analyzer to warm up for at least 30 minutes before using it to make measurements.

3-27. FRONT-PANEL ADJUSTMENT PROCE-DURE

3-28. The front-panel adjustment procedure adapts the H P 8559A Spectrum Analyzer plug-in to a particular display mainframe, and should be performed daily after instrument warm-up. The step-by-step adjustment is also an excellent way for new users to become acquainted with the various spectrum analyzer controls. Once the procedure is completed, the