Power
Meter Measurement
Calibration
Y
ou
can
use
the power
meter to
monitor and
correct the
analyzer source
power to
achieve
calibrated
absolute
power
at
the
test
port. Y
ou can
also use
this calibration
to set
a reference
power
for
receiver
power
calibration,
and
mixer measurement
calibration. The
power meter
can
measure
and
correct
power
in
two ways:
continuous
correction
|
each
sweep mode
sample-and-sweep
correction
|
single
sweep
mode
The
time
required
to
perform
a
power meter
calibration depends
on the
source
power
,
number
of
points
tested,
and
number
of readings
taken. The
parameters used
to
derive
the
characteristic
values
in T
able 5-4
are as
follows:
number
of
points: 51,
100 kHz
to 3
GHz
test
port
power: equal
to calibration
power
T
able
5-4.
Characteristic
P
ower
Meter
Calibration
Sweep
Speed and
A
ccuracy
P
ower
Desired
at T
est P
ort
(dBm)
Number
of
Readings
Sweep
Time
(seconds)
1
Characteristic
Accuracy
(dB)
2
1 33
6
0.7
+5 2 64
6
0.2
3 95
6
0.1
1 48
6
0.7
0
15
2 92
6
0.2
3 123
6
0.1
1 194
6
0.7
0
30
2 360
6
0.2
3 447
6
0.1
1
Sweep
speed
applies
to
every
sweep
in
continuous
correction
mode
,
and
to
the
rst
sweep
in sample-and-sweep
mode.
Subsequent sweeps
in
sample-and-sweep
mode
will
be
much
faster
.
2
The
accuracy
values
were
derived
by
combining
the
accuracy
of
the
power meter
and linearity
of the
analyzer's internal
source,
as well
as
the mismatch
uncertainty
associated
with
the
power
sensor
.
Note
Loss of P
ower Calibration Data
If your instrument state has not been saved after a power meter calibration,
the power correction data will be lost if any of the following circumstances
exists:
if you switch o the
analyzer ac power and you haven't saved the correction
in an internal register
if you press
4
PRESET
5
and you haven't saved the correction in an internal
register
if you change the sweep type (linear, log, list, CW, power) when the power
meter correction is activated
if you change the frequency when the sweep type is in log or list mode
Optimizing Measurement Results 5-33
To Next Page
Loading...
