IOtech MultiScan 1200, Руководство пользователя

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TempScan / MultiScan User's Manual Chapter 14: System Calibration 229
To Calibrate the Master Chassis for Offset
1. For offset calibration, locate the calibration jumpers located in one corner of an appropriate
scanning card, remove the two calibration jumper caps and short the calibration jumpers using one
of those jumper caps, as shown in the figure. Slide the scanning card into the master chassis.
2. Power up the unit and wait at least one hour before continuing.
3. Send the Calibrate Channel Offset (
H
) command
H0
– where channel
0
refers to the chassis – to
the unit, 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
).
5. To monitor the chassis calibration voltage, configure a normal acquisition with Channel 3 set as
channel type 90. The input will be returned in Counts.
To Calibrate the Master Chassis for Gain
CAUTION
CAUTION CAUTION
CAUTION
Ensure that the master chassis has first been calibrated for offset. If not, follow
the master chassis offset calibration procedure as described in the previous text.
1. For gain calibration, slide the scanning card out from the chassis, locate the calibration jumpers,
remove any calibration jumper caps, and connect clip leads from the precision voltage calibration
source, as shown in the figure. Use standard copper hookup wire.
Do not use thermocouple wire.
Slide the scanning card into the master chassis.
2. Power up the unit and wait at least one hour before continuing.
3. Set the precision voltage source to -4.4 (negative) Volts DC.
4. Send the Calibrate Channel Gain (
G
) command
G0,91
to the unit – where channel
0
refers to the
chassis, and channel type
91
refers to a reserved calibration type – and wait for the command to
complete. The TRIGGER LED indicator will flash for a few seconds.
5. 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
).
6. To monitor the chassis calibration voltage, configure a normal acquisition with Channel 1 set as
channel type 90. The input will be returned in Counts.
7. Next, set the precision voltage source to +4.4 (positive) Volts DC.
8. Repeat Steps 4, 5, and 6.