Omega Engineering OMB-NETSCAN, Руководство пользователя

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NetScan User’s Manual,
11-16-98
Calibration 6-1
Calibration 6
Introduction ……6-1
Calibration Setup ……6-1
Non-Volatile Storage of Calibration Constants
……6-2
Hardware Protected RAM ……6-2
ScanCal Software Application ……6-3
ScanCal’s Main Window ……6-3
Using ScanCal ……6-4
Interface Parameters
System Inventory
Calibration
Calibration Without ScanCal ……6-5
Password ……6-5
Calibration Mode Indicator ……6-5
Command Active Indicators ……6-5
Manual Calibration of Main Unit ……6-6
Offset Calibration of Main Unit ……6-6
Gain Calibration of Main Unit ……6-8
Manual Calibration of
Signal Conditioning Cards ……6-10
Offset Calibration of Cards ……6-10
Gain Calibration of Low Volts Cards ……6-12
Gain Calibration of High Volts Card ……6-15
Cold Junction Calibration ……6-17
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Use approved ESD precautions, including static-free work area and grounded wrist strap,
when handling circuit boards and electronic components. Failure to do so could cause
equipment damage due to electrostatic discharge.
Introduction
ScanCal is a Window’s based software program that provides step-by-step calibration instructions. If you
do not wish to use ScanCal, you can manually calibrate the system according to instructions presented later
in this chapter. Note that this chapter has been written for both ChartScan and NetScan devices.
Note: The main unit (ChartScan or NetScan) and signal conditioning cards are calibrated prior to shipment; however,
these items require periodic calibration to ensure accuracy is maintained. The industry standard for this
calibration is once every year.
Note: Main unit calibration is supported only when operating in the Calibration Mode. A specific set of commands is
provided for performing manual calibration.
Calibration Setup
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To ensure accurate measurements, calibration must only be performed by authorized
personnel.
Failure to comply with this requirement can result in faulty equipment performance and
necessitate additional services of an authorized metrology lab.
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The VDC Calibrator used must meet the following criteria:
1)
Range: 0 - 100 mV Resolution: 0.1 µV
2)
Range: 0 - 10 V Resolution: 10 µV
3)
Range: 0 - 1000 V Resolution: 1 mV (for CSN14/HV/S card calibration)
4)
Remote sensing terminals. Note that stabilizing capacitors will typically be required at the
point of connection to the main unit due to the relatively low bandwidth of high resolution VDC
calibrators.
Failure to comply with this requirement can result in faulty equipment performance and
necessitate additional services of an authorized metrology lab.