IOtech MultiScan 1200, User Manual

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236 Chapter 14: System Calibration TempScan / MultiScan User's Manual
Calibration of Voltage Scanning Cards
Note:
Prior to each calibration session, disable calibration protection by setting the rear panel DIP
microswitch 9 to the up (
1 ) position. Then enable Calibration Mode via the Enter Calibration
Mode (
K
) command with a valid password. If the default calibration password has not been
changed, enter
K12345
.
Note: At the end of each calibration session, disable Calibration Mode with the End Calibration
Mode (
E
) command. Then re-enable calibration protection by resetting DIP microswitch 9 to
the down ( 0 ) position.
To Calibrate a Voltage Card for Offset
1. Connect a Copper Short to Channel 1 on the scanning card being calibrated. Use standard copper
hookup wire.
Do not use thermocouple wire. Slide the scanning card into the previously-
calibrated master chassis.
2. Power up the unit and wait at least one hour before continuing.
3. Send the Calibrate Channel Offset (
H
) command
Hchan
– where
chan
refers to the first channel
number on the scanning card being calibrated (refer to the previous table for valid offset channel
numbers) – and wait for the command to complete. The
TRIGGER LED indicator will flash for a
few seconds.
4. Monitor the Calibration Status Register (
CSR
) to ensure that the Calibrate Channel Offset (
H
)
command completed without error. Refer to the User Status (
U
) command
U2
to monitor and
decode the Calibration Status Register (
CSR
).
To Calibrate a Voltage Card for Gain
CAUTION CAUTION CAUTION CAUTION
Ensure that the voltage scanning card has been calibrated for offset. If not, follow
the volts card offset calibration procedure as described in the previous text.
1. Connect a precision voltage source to Channel 1 on the scanning card being calibrated. Use
standard copper hookup wire.
Do not use thermocouple wire . Slide the scanning card into the
previously-calibrated master chassis.
2. Power up the unit and wait at least one hour before continuing.
3. Set the Part A precision voltage source and send its corresponding Calibrate Channel Gain (
G
)
command
Gchan,type
– where
chan
refers to the first channel number on the scanning card
being calibrated (refer to the previous table for valid gain channel numbers) – from the following
list:
•
Part A: -100.0 mV DC
Gchan,11
•
Part E: -5.00 V DC
Gchan,13
•
Part B: +100.0 mV DC
Gchan,11
•
Part F: +5.00 V DC
Gchan,13
•
Part C: -1.00 V DC
Gchan,12
•
Part G: -10.00 V DC
Gchan,14
• Part D: +1.00 V DC
Gchan,12
• Part H: +10.00 V DC
Gchan,14
Wait for the Part A command to complete. The TRIGGER LED indicator will flash for a few
seconds.
4. Monitor the Calibration Status Register (
CSR
) to ensure that the Calibrate Channel Gain (
G
)
command completed without error. Refer to the User Status (
U
) command
U2
to monitor and
decode the Calibration Status Register (
CSR
).
5. Repeat Steps 3 and 4 for each of the next seven parts: Part B through Part H .