HP 85108, Системное руководство, Страница: 52 / 136

Figure 3-13. Amplifier Gain, Frequency Domain P oint-in-Pulse
The dynamic range can b e increased using IF a v eraging, but, given the system noise o or with
the wide IF bandwidth, an a v eraging factor of ab out 256 a v erages is the maximum v alue that
should b e used. In general, using an a v eraging factor greater than 256 will not result in an y
increase in visible dynamic range.
Pulse Profile Domain
Calibration
After selection of the pulse prole frequency , measuremen t calibration for pulse prole
measuremen ts is accomplished in exactly the same w a y as for the standard HP 8510.
F ollo wing are t w o measuremen t calibration metho ds, one for calibration in the Pulse Prole
domain, and the second for calibration using the F requency List feature. Select the b est one
for y our application.
The pulse prole domain calibration pro cedure is an easy w a y to familiarize y ourself with
the pulse prole domain and for general-purp ose measuremen ts using simple resp onse-only
correction.
Use the frequency list tec hnique when more than one pulse prole frequency and 1-P ort or
2-P ort correction is required. Given adequate signal lev els, accurate timing, and frequency
stability , there is essen tially no dierence in the accuracy of the pulse prole measured data
whether the calibration is p erformed in the pulse prole domain as describ ed in the rst
pro cedure or in the frequency domain as describ ed in the second pro cedure. The main
adv an tage of calibration in the frequency domain is that y ou can calibrate at all frequencies in
the list while only connecting the standards once.
3-16 Operation