58542 VXIbus Universal Power Meter
A-44
Publication 21555, Rev. E, September 2002
A.9.2
Relative or Referenced Measurements Example 2
The following program finds the 1 dB compression of an amplifier/transmitter at a single frequency.
300
ASSIGN @Pwr_mtr to 70101
310
CLEAR @Pwr_mtr
320
WAIT 1
330
!
340
OUTPUT @Pwr_mtr;CALC1:MODE NORMAL
! Can ONLY use REFerence commands in NORMal
Mode!!
350
OUTPUT @Pwr_mtr;CALC1:POW 1
! Channel 1 configured to measure sensor 1 power
360
OUTPUT @Pwr_mtr;CALC1:UNIT W
! Transmitter output power in Watts.
370
OUTPUT @Pwr_mtr;CALC2:RAT 1,2
! Transmitter gain stays in default, dBm.
380
OUTPUT @Pwr_mtr;CALC2:UNIT DBM
! Transmitter output power in Watts. Units are channel,
! not sensor, specific
390
!
400
!
410
OUTPUT @Pwr_mtr;TRIG:SOUR IMM ! TRIG:SOUR must be IMM when using READ#?
420
OUTPUT @Pwr_mtr;INIT:CONT OFF
! INITiate:CONTinuous arming must be OFF when using READ#?
430
!
440
OUTPUT @Pwr_mtr;SENS1:AVER:COUN 1! Sets averaging to manual and one sample per measurement
reading.
450
OUTPUT @Pwr_mtr;SENS2:AVER:COUN 4! Sets averaging to manual and 4 samples per measurement
reading.
460
!
470
OUTPUT @Pwr_mtr;SENS1:CORR:FREQ 1.94E9
! Applies Cal Factor for 1.94 GHz, Sensor 1.
480
OUTPUT @Pwr_mtr;SENS2:CORR:FREQ 7.0E7
! Applies Cal Factor for 70 MHz IF input, Sensor 2.
490
!
500
!#################################################
510
!
520
! System Setup
530
! Power Splitter attached to source.
540
! DUT input and sensor 2 on the splitter outputs.
550
! Sensor 1 at DUT output.
560
! Check max power rating on sensor 1 and use an appropriate attenuator if necessary.
570
! Use offset to account for any necessary attenuation when not using Giga-tronics high power sensors.
580
!
590
!#################################################
600
!
610
! Relative measurement setup using CALC#:REF:COLL.
620
!
630
OUTPUT @Pwr_mtr;CALC2:REF:MAG 0.00
! Resets REFerence level from value set with
CALC2:REF:COLL
640
OUTPUT @Pwr_mtr;CALC2:REF:STAT ON
! Enables REFerence operation.
650
!
660
Smal_sig_pwr=-30
670
OUTPUT @Source;OPPL;Smal_sig_pwr
! Set power to small signal region of amp, -30 dBm.
680
OUTPUT @Pwr_mtr;CALC2:REF:COLL
! Takes current measurement and adds inverse to further
! measurements
690
!
700
! STEP POWER FROM SMALL SIGNAL REGION TO ABOVE 1 dB COMPRESSION LEVEL
710
!
720
FOR I=Smal_sig_pwr TO Smal_40 STEP .05
730
OUTPUT @Source;OPPL;I
! Increments power level into amplifier’s input. Add wait statement
! at 735 if source settles too slow.
740
OUTPUT @Pwr_mtr;READ2?
! Measures Sensor 1 over sensor 2, dB relationship
750
ENTER @Pwr_mtr;Rdg
760
PRINT Rdg
770
!
780
Comp_lvl=-1
790
IF Rdg<Comp_lvl THEN
! Finds 1 dB compression level
800
OUTPUT @Pwr_mtr;READ1?
! Measures Output Power at sensor 1.
Содержание 58542
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