HP 3562A Operating Manual page 95

USING THE LOG
RESOLUTION MODE
PURPOSE O F THIS CHAPTER
The purpose of this chapter is to show you the details of using the HP 3562A's log resolution
mode. For an introductory discussion of the uses of this mode, please refer to the User's Guide
at the beginning of this manual.
This chapter shows you how to:
1. select measurements and displays
2. set frequency spans
3. set up the source
4. set up averaging
5. view the input signals
To keep track of where you are while setting up measurements, fold out the measurement
setup checklist at the end of this chapter.
GETTING STARTED IN THE LOG RESOLUTION MODE
To put the
HP
appears, press LOG RES. No menu appears after you press this softkey, but the instrument
configures itself to the log resolution mode.
Several differences between this mode and linear FFT measurements should be noted:
Frequency spans are limited to 1, 2, 3, 4 or 5 decades, and the resolution is always
80 lines/decade.
Log resolution uses a predefined windowing function for all measurements, so
windows are not selectable.
Overall measurement time is determined by the time required to measure the lowest
decade.
Triggering and time averaging are not applicable to log resolution. (Delayed trigger­
ing can be used when measuring throughput files from disc: see Chapter 6 for more
information.)
Filtered time and filtered spectrum displays are not available.
The log resolution mode is optimized for wide-band frequency response measurements. The
trade-off required is a loss of accuracy in power spectra of discrete frecuencies.
Chapter 2
3562A in the log resolution mode, press MEAS MODE. When its menu
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