Omega Engineering OMB-NETSCAN, User Manual

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NetScan User’s Manual Calibration 6-7
1. Ensure the main unit is powered “OFF,” and has no power sources connected to it.
2. If a signal conditioning card is in slot #1 of the chassis, remove the card.
3. Install Calibration Card into Slot #1 (bottom slot) of the main unit.
&$87,21
Do not perform calibration until after the main unit and calibration equipment
have been powered on for at least one hour.
4. With all covers in place, allow the main unit and calibration equipment to warm up (powered on) for at
least 1 hour.
5. Place the Calibration Enable/Disable Pushbutton (on main unit rear-panel) in the “enable” (indent)
position to enable writing to RAM.
Note to
ChartScan users: Early production ChartScan units do not have a Calibration Enable/Disable Pushbutton.
For these units the calibration mode is enabled by positioning the DIP switch right-most micro-switch (#9) to the “1”
(up) position. Note that ChartScan units with the pushbutton have it located on the rear panel, as indicated in the
NetScan figure (page 6-2).
6. If the calibration password has not been changed, enter
K12345
. If the password has been changed,
enter the K command and new password. This enables the calibration mode.
7. Type
U2X
to verify calibration mode.
U128
should appear, indicating the unit is in calibration mode.
8. Insert banana plugs of shorting option (shorting bar or 3 linked plugs) into -V, +V, and GND binding
posts of calibration card. This short circuits the analog backplane HI and LO voltage inputs and GND
(see previous figure, Calibration Card and Two Shorting Options).
9. Type
H0X
. The Trigger LED will flash, indicating that offset calibration is in progress. When flashing
stops, the chassis offset calibration is complete.
10. Type
U2X
.
U128
should appear, indicating the unit is in calibration mode and that no error has
occurred.
Response codes and meanings applicable to calibration are as follows:
Response to U2X Indication for Calibration Mode
U128 No error
U129 Read Failure (EEPROM Error)
U130 Write Failure (EEPROM Error)
U132 Chksum Err (EEPROM Error)
U136 Cal Err (offset, gain, or temperature
sensor out of range)
U144 Invalid password
U160 Invalid command