Anritsu ML2430A operation manual User CAL Factors, 14USER CAL Factors, Eeprom

PROCEDURES USER CAL FACTORS

5-14USER CAL FACTORS

NOTE

This feature is also available when using Anritsu MA4700A/ MA4600A sensors with the Anritsu MA2499B Sensor Adapter. Since

the MA4700A/ MA4600A sensors do not contain an EEPROM, the user cal factors are stored in the MA2499B adapter

EEPROM.

NOTE

A * in the displayed sta- tus box by the Cal Fac- tor indicator, signifies User Cal Factors are active.

User Cal Factors are maintained in the sen- sor.

The data can be displayed as a maximum value only, a minimum value only, max- imum and minimum values, the average of all the readings during the time slot period, or the latest measured value. These display modes are selected in the SYSTEMPwrVsTime menu, DATA HOLD representation. Measurement setup, i.e., trigger, etc., is selected the same way as in Readout mode. The minimum sweep time is 1 minute, and the maximum sweep time is 24 hours.

All MA24XXA Power Sensors have an internal EEPROM containing correction and calibration factors programmed into the sensor at the factory. This “cal factor” data is used when the power meter is set up to use frequency or volts per GHz calibration factors. The correction is in linearity (across the dynamic range) and sensitivity (across frequency).

The ML2430A Series has the capability to define sets of calibration factor data and store them in the sensor. A user-defined cal factor table can be used on its own, or in conjunction with the factory-defined cal factor table. Linearity correction is not affected provided the meter cal factor frequency is set correctly.

Depending on the amount of factory calibration data stored in the sensor, there can be up to 10 user-defined cal factor tables. A “user” cal factor table consists of up to 90 frequency/cal factor data pairs for sensors up to 40 GHz or 110 fre- quency/cal factor data pairs for sensors up to 50 GHz, plus a 7-character identity text string. User cal factor tables are fully interpolated, and can be used to apply correction for attenuators placed in front of the sensor. In this situation, determine the attenuation factors and use them in addition to the Factory cal factors. The number of frequency/cal factor data pairs in the factory defined table depends on the sensor being used.

The cal factor tables for a particular sensor are not maintained by the meter, but are held in the sensor. This means that when moving a sensor (perhaps with an associated attenuator or calibration record) from one meter to another, the cali- bration stays valid. It is not necessary to re-setup the new meter.

The first time a sensor is used with the ML2430A Series, a slight delay may be experienced when the sensor is first plugged in. This is caused by the firmware preparing the sensor to accept user cal factor tables. After first initialization, user cal factor tables will have only a single entry at 50 MHz, 100%.

ML2430A OM 5-19