Pressure Systems 9022 Instrukcja Użytkownika Pobierz pdf (Strona 131)

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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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sensors. If a digitally compensated 9400 sensor is attached, its parameters are uploaded to the

module and used for calibrating the sensor. If a non-digitally compensated 9400 sensor is

attached but is equipped with non-volatile memory (EEPROM) and responds properly to the

9021/9022 module query, it’s parameters are uploaded and used for calibrating the sensor. If a

9400 sensor is not detected, the module will look to see if the module has been configured to

utilize the user-provided parameters out of scanner non-volatile memory. If configured to do so,

the module will use the parameters stored for the channel in scanner non-volatile memory.

Otherwise factory default parameters will be used, resulting in the 9021/9022 modules returning

EU (engineering units) in terms of measured volts.

The following procedures describe methods for storing various parameters into both volatile and

non-volatile memories of 9021/9022 Intelligent Pressure Scanners.

4.7.2 Download calibration parameters into volatile memory

4.7.2.1 For Non-digitally Compensated 9400 Sensors without Non-volatile

Memory or Non-9400 Sensors

Sensor offset and gain terms are downloaded into volatile memory using

the ‘v’ command with coefficient index numbers 00 and 01 respectively

for the selected channel. c0 through c3 coefficients are downloaded into

volatile memory using the ‘v’ command with coefficient index numbers 02

through 05 respectively.

Front-end gain select is downloaded into volatile memory using the ‘v’

command with coefficient index (cc) 4D. (See NetScanner_ System

(9016, 9021, & 9022) User’s Manual, Chapter 3, Download Internal

Coefficients (Command ‘v’)). Data for this index selects the front-end

gain for the module as follows: 0=unity, 1=20, 2=45, 3=90. Example:

‘v0014d 2’ sets front-end gain for the first transducer to 45. This

parameter can be retrieved from the module using the ‘u’ command with

coefficient index 4D.

4.7.2.2 For Non-digitally Compensated 9400 Sensors With Non-volatile Memory

For non-digitally compensated 9400 sensors with non-volatile memory,

the same commands as for non-9400 “generic” (third party sensors) apply.

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