Wahl DST400, Руководство пользователя

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Wahl DSTCAL Software User Manual
7
Build Time : Identifies time firmware was compiled.
Hardware Revision : Identifies Hardware revision level. This parameter is hard coded
into firmware.
Serial number : Identifies serial number of PCB, programmable on DSTCAL-Pro only.
LCD Refresh : Sets update period for the LCD. 1 period = 250 mS, thus, LCD Refresh:
2 = 500 mS or 0.5 second update rate for LCD. Default value is 8. LCD Refresh is not
available for model DST550, which is hard programmed for sample intervals.
Low Battery Check : Sets update period for checking of low battery. 1 period = 250
mS, thus Low Battery Check: 1200 = 300,000 mS or 5 minute interval for battery
checking.
Calibration Information
Module Calibration Data
– RTD Models
Active Rref
– Resistance of nominal 248 ohm reference resistor as calculated by
measurements during the Ohm Meter Calibration process.
Active Roffset
– Offset value for reference resistor as calculated by measurements
during the Ohm Meter Calibration process.
R0
– Resistance at 0.0

C. R0 value is used for calculating temperature from the
measured resistance. For the highest accuracy of measurements, it should be set to
match the R0 value of the probe being used. It may be manually entered or may be
automaticall
y calculated and updated by performing “Probe (system) Calibration”. Box
will turn “red” if value is out of acceptable range of 100

10 ohms.
Select Calibration to Perform : The Drop down box allows the user to select one of two
calibration routines. To select, simply highlight the desired routine and click the
“Calibrate” button. A calibration routine with step by step instructions will take you
through the calibration process. See DSX section for DSX current loop calibration
instructions.
1) Ohm Meter Calibration
– Performs the calibration of the Electronics to ensure
it accurately measures resistance. This routine requires the use of known
precision resistances. A precision resistor decade box or precision fixed
resistors may be used. Some electronic RTD simulators may also work, but we
recommend validating their use with the Digistem prior to using them for
calibration. R0 will automatically be set to 100.00 ohms for this calibration and
upon completion, the user will be given the option to return to the initial R0 or
leave it at 100.00 ohms.