Front Panel Operation Sensor Menu
ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-7
SOURCE [CFSRC, CFVAL]
Three selections are available, Frequency, Manual, and V/GHz.
FREQ [CFFRQ]
When the Cal Factor source is set to Frequency or manual, enter the input signal
frequency in GHz or MHz. The correct sensor calibration factor is automatically
interpolated and applied to the displayed power reading.
Frequency: In this mode, correction data is read from the EEPROM in the sensor
and applied automatically to the measurement based on the user’s
input frequency. The EEPROM correction data value nearest to the
entered frequency is used to calculate the correction applied to the
signal. For greater accuracy, calibration factors are interpolated for
settings that are between the calibration factor data provided in the
sensor EEPROM. For example, if calibration factors exist for 1 and 2
GHz, then the calibration factor applied for 1.5 GHz will be a value
midway between the two.
Sensor linearity adjustments for temperature are also interpolated; If
the correction factor for 1.5 GHz at 25°C is 1 dB, and for 35 ° C is 1.1
dB, then at 30 °C a value of 1.05 dB will be used.
Note
Frequency or V/GHz are preferred methods as the sensors have internal linearity
correction which varies with frequency.
Manual Set: Allows manual correction of sensor data either as a percentage or a
fixed dB value. An input frequency is also required to allow the correct
linearity correction factors to be applied.
V/GHz: Most modern synthesized sources have a rear panel BNC connector
which outputs a voltage proportional to the synthesized frequency. The
V/GHz is supplied to the rear panel input connector of the ML243xA.
The SETUP submenu has controls for customizing the voltage and
frequency relationship.
Note
When the MA2499B Anritsu Sensor Adapter or the MA2497A HP Sensor Adapter
are used, the input frequency should be set to 50 MHz irrespective of the
measurement frequency. Linearity correction factors are not applied when the
adapters are being used.
Note
You will see a live update of the Current Cal Factor only if that sensor is being used
on a channel. For example: If you are editing the Cal Factor Frequency on Sensor
B, but you only have channel 1 set to A and channel 2 off, you will not see the
"Current Cal Factor" being updated.
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