Technical data

85108L System Manual
Operation
Pulsed-RF Measurements Overview
3-18
Pulse Profile Domain
Calibration
After selection of the pulse profile frequency, measurement calibration for pulse profile
measurements is accomplished in exactly the same way as for the standard 8510. Following are two
measurement calibration methods, one for calibration in the Pulse Profile domain, and the second
for calibration using the Frequency List feature. Select the best one for your application.
The pulse profile domain calibration procedure is an easy way to familiarize yourself with the pulse
profile domain and for general-purpose measurements using response-only correction. Use the
frequency list technique when more than one pulse profile frequency and 1-Port or 2-Port correction
is required. Given adequate signal levels, accurate timing, and frequency stability, there is no
difference in the accuracy of the pulse profile measured data whether the calibration is performed
in the pulse profile domain as described in the Pulse Profile Domain procedure or in the frequency
domain as described in the Frequency List procedure. The main advantage of calibration in the
frequency domain is that you can calibrate at all frequencies in the list while only connecting the
standards once.
Measurement Calibration Procedure
Perform measurement calibration in the pulse profile domain as follows:
1. Turn correction off by pressing
CAL, [CORRECTION OFF].
2. Press
DOMAIN, then [FREQUENCY] to select the frequency domain. Press STIMULUS MENU, then
[STEP] to select the sweep mode.
3. Press
START, then set the start frequency to the desired pulse profile frequency. This will be the
frequency measured when the pulse profile domain is selected.
4. Press
[PULSE PROFILE] on the Domain menu. Press MARKER and notice that the active function
readout shows both the time value at the marker position and the current measurement
frequency.
5. Select the maximum number of points required for the measurement, then perform the
appropriate measurement calibration.
Note that the 8510 pulse output is set to the active state (RF always On) during measurement of the
calibration standards. For external triggering, the pulse modulation is operating during the
calibration, so the pulse width or time span cannot be changed after calibration.
Repeat this sequence for the next pulse profile frequency. With several cal sets created in this way,
you can select each pulse profile frequency in turn by recalling the corresponding cal set.