HP 85108, System Manual

Page: 48 / 136

Figure 3-10. Instrument State 8
Chec k these items:
Domain: F requency
Display Mo de: Single parameter
Wide BW Detectors: On, indicated b y the W to the left of the graticule.
Channel 1: log mag, S
11
Channel 2: phase, S
11
Pulse Measurements Ov erview
Tw o t yp es of measuremen ts are a v ailable with the pulse conguration. Eac h t yp e of
measuremen t is describ ed b elow.
1. Pulsed-RF S-parameters v ersus F requency . Making pulsed-RF measuremen ts in the
frequency domain is accomplished b y sync hronizing the measuremen t pro cess with the
pulse so that the measuremen t is made at a single, user-sp ecied time during the pulse.
A t eac h frequency , the sources are tuned, the RF is turned on, then the measuremen t
is made after a certain dela y . Figure 3-11 sho ws an example of this \frequency domain
p oint-in-pulse" measuremen t using the in ternal pulse output and the in ternal measuremen t
trigger. Eac h data p oint of the trace represen ts the resp onse of the device to the pulsed
stimulus at the same in terv al after the pulse is turned on.
3-12 Operation