Specifications

Next, let us look at a complex circuit. A resistive impedance change
R<Z
0
and a shunt capacitance and series inductance. These impedance
changes are shown in the time domain for the lowpass-impulse
response, lowpass-step response, and bandpass-impulse response
(Figure 8-7).
The MS462XX processes bandpass-impulse-response data to obtain
phasor-impulse response. This becomes most advantageous where
both a reactive reflection and an impedance change occur at the same
location. The real part of the time-domain response shows the location
of impedance level changes, while the imaginary part shows the type
of reactive discontinuity. Phasor-impulse response displays one
discontinuity at a time (Figure 8-9).
TIME TIME DOMAIN
DOMAIN MEASUREMENTS
MS462XX OM 8-7
BANDPASS
RESPONSE
LOWPASS
IMPULSE
RESPONSE
LOWPASS
STEP
RESPONSE
REAL S
11
MAGNITUDE S
11
REAL S
11
5 cm10 cm 10 cm
50
Ω
20
Ω
50
Ω
Figure 8-7. Complex Impedances
CIRCUIT ELEMENTS
Bandpass-Phasor Impulse Response
R>Z
O
SHUNT C
SERIES L
IMPEDANCE
11
REAL S IMAGINARY S
11
O
R<Z
Figure 8-8. Bandpass Phasor
Response
MAGNITUDE
REAL
IMAGINARY
SPAN
BANDPASS
C
PHASOR
IMPULSE
5 cm 10 cm
20
Ω
50
Ω
Figure 8-9. Phasor-Impulse Response Data