CAUTION

The digital voltmeter (or digital multimeter) used to verify calibration voltage accuracy must meet the following criteria:

1)Minimum Resolution: 6-1/2 digits

2)Minimum DC Accuracy: 0.005% full scale

Failure to comply with this requirement can result in faulty equipment performance and necessitate additional services of an authorized metrology lab.

CAUTION

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.

The main main unit and each signal conditioning card are calibrated separately.

Note that the main unit and its signal conditioning cards contain components for saving calibration constants, allowing for card swapping within a system, card swapping between systems, and system expansion. Calibration relates to the main unit and cards as follows:

Main Unit: NetScan or ChartScan main chassis, calibrated for offset and gain only.

Signal Conditioning Cards: Calibrated for offset, gain, and cold junction sensor offset (if thermocouples are used).

Non-Volatile Storage of Calibration Constants

To preserve calibration constants, main unit constants are stored in an on-board battery backed up RAM and the constants for each signal conditioning card are stored on the card’s EEPROM.

Hardware Protected RAM

Your scanning device contains a security circuit. This circuit disables writing to the portion of battery backed up RAM which holds the main unit’s calibration constants and calibration password. You must enable the calibration mode prior to calibrating the main unit or changing the password.

NetScan, Rear Panel

To enable calibration, locate the Calibration Enable/Disable Pushbutton. (ChartScan User’s see notes 1 and 2, below). Push the button so it is in the indent position. This enables writing to RAM.

Note 1: ChartScan users only. Early production ChartScan units do not have a Calibration Enable/Disable Pushbutton.

 

For units with no calibration pushbutton, a DIP Switch is used instead of the pushbutton, as described in

 

note 2. ChartScan units that do have the pushbutton will have it located on the rear panel, as in the above

 

NetScan figure.

 

Note 2: ChartScan users only (for units with no Calibration Enable/Disable Pushbutton). If you are using an early

 

production ChartScan unit, with no calibration pushbutton, then you will enable the calibration mode by

 

positioning the DIP switch right-most micro-switch (#9) to the “1” (up) position.

 

 

6-2 Calibration

ChartScan User’s Manual

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Omega Vehicle Security 1400 manual Non-Volatile Storage of Calibration Constants, Hardware Protected RAM

1400 specifications

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