Measurement Computing TempScan/1100 - Manual (Page 231)

TempScan / MultiScan User’s Manual 889897 API Command Reference A-35
G
- Calibrate Channel Gain
TYPE Calibration
EXECUTION Immediate
SYNTAX Gchan,
type
Calibrate the correction gain constants for given option card where chan is
the channel number such that 1 < chan < max , where max = 992 for the
TempScan/1100 and max = 744 for the MultiScan/1200. The chassis is
chan = 0 .
type is the channel type.
DESCRIPTION
Note: This command is only for advanced users who perform their own calibration. It is not necessary
for normal, everyday operation.
Active only in Calibration Mode, the Calibrate Channel Gain ( G ) command is used to calibrate the correction gain
constants for a given scanning card. The channel gain value is necessary in order for the internal firmware to
accurately interpret readings coming from the input channels. This command will take the parameters
chan and
type and will calculate the gain based on the present channel input voltage.
For more information on manual calibration, see chapter System Calibration.
Note: To achieve correct results, this command must be issued twice. First, with a negative input voltage and
next, with a positive input voltage. Each time the command has been issued, the precision voltage source
must remain at its value until the TRIGGER LED indicator stops flashing.
EXAMPLE
PRINT#1, “OUTPUT07;K12345X” ‘ Enter Calibration Mode
‘ Apply negative precision voltage
PRINT#1, “OUTPUT07;G524,1" ‘ Calculate negative gain for thermocouple card on slave
card 16 (TempScan/1100)
‘ Wait for command to complete
‘ Apply positive precision voltage
PRINT#1, “OUTPUT07;G524,1" ‘ Calculate positive gain for thermocouple card on slave
card 16 (TempScan/1100)
‘ Wait for command to complete
‘ Remove precision voltage
PRINT#1, “OUTPUT07;EX” ‘ End Calibration Mode