5-12 Automating Measurements
Automated Measurement Setup and Control
Using Single Sweep to Measure and View All Four S-Parameters
Using Single Sweep to Measure and
View All Four S-Parameters
You can save sweep time when measuring S-parameters on an
HP 8712ES or HP 8714ES by using the single sweep feature. As long as
a full two-port calibration has been performed, you can measure all four
S-parameters with a single sweep cycle, and then individually view each
S-parameter by then pressing the desired S-parameter softkey under the
or menu.
From the front panel, set up your measurement parameters, perform (or
recall) a valid full two-port calibration, and then connect the DUT. Press
. The analyzer takes a forward and reverse
sweep to capture all four S-parameters, and then goes into “hold sweep”
mode. Press or , and then any of the S-parameter
measurement keys to view the desired parameter.
The SCPI command to perform a single sweep and then hold is
ABOR;:INIT[1|2]:CONT OFF;:INIT[1|2]; *WAI
For an automated example, see the example program listed below. This
program is also available titled “FOURPARM” on your Example
Programs Disk.
1000 !Filename: FOURPARM
1010 !
1020 ! Demonstrates that all four S-parameters can be computed by
1030 ! the instrument after a single sweep.
1040 !
1050 ! Outline:
1060 ! 1. Select Default 2-Port Cal
1070 ! 2. Select S11 on MEAS 1. S21 on MEAS 2.
1080 ! These are Port 1 Reflection and forward transmission.
1090 ! Take a sweep.
1100 ! 3. Do Data->Mem on MEAS 1 and on MEAS 2.
1110 ! 4. Without taking another sweep, select
1120 ! S22 on MEAS 1 and S12 on MEAS 2.
1130 ! These are Port 2 Reflection and reverse transmission.
1140 !
1150 ! The display will show:
1160 !
1170 ! MEAS 1 : Port 1 and Port 2 REFLECTION (S11 and S22)
1180 ! MEAS 2 : forward and reverse TRANSMISSION (S21 and S12)
1190 !
1200 ! Note that a single MEAS channel could be used to gather all
four
1210 ! S-parameters after a single sweep. For display convenience
1220 ! however, this program uses both MEAS channels.
MEAS 1 MEAS 2
MENU
MEAS 1 MEAS 2
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