Model
8754A
Power Level Measurements
S-Parameter Measurements
POWER LEVEL MEASUREMENTS
The
8754A
can
measure the absolute power in dBm
at
the R, A,
and
B
input
ports. Some applications
of
this capability
are
measuring
and
setting actual signal levels
into
the R, A,
and
B inputs
prior
to
calibration; verifying signal levels
at
various points in the test setup including actual incident
and
tran-
smitted power;
and
direct measurement
of
losses in the test set, cables,
and
fixtures.
MEASUREMENT
Press
to
release
OFFSET
buttons.
·Set
CRT
and
frequency sweep.
Select measurement:
R
(Channell
with
both
CHI
and
CH2
OFF),
A
(Channell),
or
B (Channel 2).
Set REFERENCE
to
move trace
to
reference position line.
Power (dBm)
= REFERENCE switch setting +trace displacement from reference line.
S-PARAMETER MEASUREMENTS
S-parameters define
the
transmission and reflection magnitude and phase characteristics
of
the
test device.
Using
the
8748A
S-Parameter Test Set with the 8754A allows measurement
of
both
forward and reverse
S-Parameters
without
disconnecting
the
test device. The reflection S-parameters
(S1
1,
input
reflection
coefficient, and
S2
2,
output
reflection coefficient) are measured using a sequence similar
to
that
described
for Reflection Coefficient, Page 23. Transmission S-Parameters (S12' forward transmission coefficient
and
S2
1, reverse transmission coefficient) are measured using
the
rectangular magnitude and phase displays.
The
8748A
front
panel
S1
1
/S2
1 (forward) and
S22
/S1"2
(reverse)
buttons
switch the incident
RF
to
Port 1
in forward
or
Port 2 in reverse. These illustrations show
the
signal paths for forward and reverse selections.
RF
-6
dB
Reference
Plane
Extension
~
L
Inc~ent
A
Reflected
FORWARD
B
Transmitted
RF
-6
dB
Reference
Plane
Extension
A
Reflected
REVERSE
B
Transmitted
Bridge Bias
1
Bridge Bias
2
25
-6dB
6 dB 6 dB
I 1
:::;n
g
)
>-i
o::~
~
>
cOU::
B
1
1
1
PORT
2
PORT
1
B~geB~
B~geB~
1 2
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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