Operation
Publication 21555, Rev. E, September 2002
2-27
2.5.17
Cal Factor Correction
■
SENS#:CORR:FREQ
■
MEMory:FREQuency
■
MEMory:SELect
■
MEMory:SLOPe
Power Sensors have a measurable frequency response. During manufacture, this response is calibrated at
1 GHz intervals. Instead of printing the data on the sensor label, each Giga-tronics power sensor
includes a built-in EEPROM which has been programmed with the frequency calibration factor data for
that particular power sensor.
The following SCPI commands tell the 58542 the operating frequency of the measured microwave or
RF signal. Thus, the meter automatically interpolates the correct Cal Factor and applies that value to
the measurement data. By performing this automatically, there is no need to read Cal Factor data from
the side of sensor housings and program the data into tables within the ATE programming. Except for
advanced measurement techniques using Burst Mode, there is no need to write cal factor interpolation
routines; this is all done by the power meter. As shown below, sensor Cal Factor data can be read into
the computer. Also see the Sensor EEPROM Commands in Section 2.5.32 for Cal Factor programming.
SENS#:CORRection:FREQ
Syntax:
SENSe<sensor 1 or 2>:CORRection:FREQuency[:CW-FIXed] 5e7
Example:
OUTPUT @PWR_MTR;SENS2:CORR:FREQ 5E7
! SETS SENSOR 2 FREQUENCY TO 50 MHZ
Response:
0 = off, 1 = on
Description:
This command allows correcting for sensor frequency response characteristics. The power
meter uses this frequency to automatically interpolate and apply the Cal Factor for that sensor
(computed from Cal Factor data points stored within each sensor’s EEPROM). Unless the
EEPROM has been modified subsequent to shipment, the Cal Factor is always 0.0 dB at
50 MHz, 5e7. Be sure to correct for sensor cal factor by using this command, using
automated V
PROP
F correction, sending cal factor REFerence value, or correcting for Cal
Factor in the ATE system by downloading Cal Factor points for the 58542.
Syntax:
SENSe<sensor 1 or 2>:CORRection:FREQ?
Example:
OUTPUT @PWR_MTR;SENS2:CORR:FREQ?
! QUERIES SENSOR 2 FREQUENCY VALUE FOR 50 MHZ
Response:
+5.0000E+07
Description:
This command reports the current operating frequency setting for a particular sensor.
Syntax:
SENSe<sensor 1 or 2>:CORRection:VPROpf[:STATe]
space
<ON-OFF>
Example:
OUTPUT @PWR_MTR;SENS1:CORR:VPRO ON
! ENABLES SENSOR 1 V
PROP
F FUNCTION
Description:
Setting this control to ON activates V
PROP
F and deactivates SENS#:CORR:FREQ.
Syntax:
SENSe<sensor 1 or 2>:CORRection:VPROpf[:STATe]?
Example:
OUTPUT @PWR_MTR;SENS1:CORR:VPRO?
! QUERIES V
PROP
F FUNCTION STATUS
Description:
This command reports the ON or OFF status of the V
PROP
F correction for the sensor.
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