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Functions and Measurements
Making a Reflection Calibration Measurement
Making a Reflection Calibration Measurement
The following procedure makes a reflection measurement
using a coupler or directional bridge to measure the return
loss of a filter. This example uses a 370 MHz low pass filter
as the DUT.
The calibration standard for reflection measurements is
usually a short circuit connected at the reference plane (the
point at which the device under test (DUT) is connected.)
See Figure 3-22, a short circuit has a reflection coefficient of
1 (0 dB return loss). It reflects all incident power and
provides a convenient 0 dB reference.
1 Connect the DUT to the directional bridge or coupler as
shown in Figure 3-22. Terminate the unconnected port of the
DUT.
Figure 3-22 Reflection Measurement Short Calibration Test Setup
Remote
Standby
On
TG SOURCE CAL OU T
50MHz 10dBm
7
·
4
1
0
2
5
89
6
3
Back
Ent er
Marker
Peak
Search
Marker
Auto
Tune
Det/
Display
File/
Print
BW/
Avg
View/
Trace
MeasMODE
Sweep/
Trig
Local
Save
N9320A SPECTRUM ANALYZER 9 kHz - 3.0 GHz
PROBE PO WER
RF IN 50
50VDC MAX
30dBm 1W MAX
CAT Ⅱ
Short
Circuit
DUT
Reference Plane
or
Coupled Port
Directional
Bridge/Coupler
Test P ort
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