Calibrate – Sensoray 417 User Manual
Page 27
Instruction Manual
26
Calibrate
This command calibrates one of the coprocessor’s internal standards. You must supply two stable
references, 5V and 500mV, which are applied to external channels during board calibration. Exter-
nal channels used for the calibration must be properly configured and allowed to settle before issu-
ing the calibrate command. A board reset must be invoked after each range is calibrated.
COMMAND: (192 + Chan), (RangeCode), (CalData MSB), (CalData LSB)
RESPONSE:
(IgnoreThisValue)
VB Code Example:
‘*********************************************************************
‘ Calibrate one voltage range on a Model 417 board.
‘*********************************************************************
Sub CalRange(BasePort%, Chan%, RangeCode%, AppliedVolts!)
Dim TypeCode
As Integer
Dim Scalar
As Single
Dim Junk
As Integer
Select Case RangeCode
CASE 0: Scalar = 5000:
TypeCode = &H15
CASE 1: Scalar = 50000:
TypeCode = &H16
End Select
Call SetSensorType(BasePort, Chan, TypeCode)
Call Delay(900)
Call SendByte(192 + Chan)
‘Issue Calibrate command to 417
Call SendByte(RangeCode)
Call SendByte(AppliedVolts * Scalar)
Junk = ReadByte(BasePort)
‘Wait for 417 to calibrate
Call OUT(BasePort + 1, 0)
‘Reset the 417 board
Do: Loop While (INP(BasePort + 1) And FAULT)
End Sub
‘*********************************************************************
‘ Calibrate a Model 417 board. This snippet assumes 5.0000V is
‘ applied to channel 3 and 0.50000V is applied to channel 7.
‘*********************************************************************
Call CalRange(BaseAdrs, 3, 0, 5.0000)
‘Calibrate 5V range
Call CalRange(BaseAdrs, 7, 1, 0.50000)
‘Calibrate 500mV range
Table 10: Range codes for the Calibrate command
RangeCode
Range
0
5 V
1
500 mV