Measurement-computing DAQFlex Bedienungsanleitung PDF herunterladen (Seite 11)

Chapter 5

Calibrating a device

The message-based firmware provides messages that let you calibrate the analog inputs or outputs on a

device.

Calibrating analog inputs

To modify the analog input calibration settings, complete the following steps:

1. Send the "AICAL:UNLOCK" message to unlock the AICAL component and put the device into

Calibrate Mode.

When the AICAL component is unlocked, sending a message to any component other than AICAL

will lock the AICAL component.

2. Send the "AICAL:REF=value" message to set the calibration voltage.

Refer to the device-specific information to determine the calibration voltages supported by the

device.

The calibration voltage value is stored in EEPROM and can be retrieved with the "?AICAL:REFVAL"

query.

3. Send the "AICAL{ch}:RANGE=value" message to set the channel and range value to calibrate.

4. Send the "AICAL{ch}:SLOPE=value" message to set the slope for the current range setting.

5. Send the "AICAL{ch}:OFFSET=value" message to set the offset for the current range setting.

6. Send the message "AICAL:LOCK" to lock the AICAl component and exit Calibration Mode.

The device returns INVALID if any AICAL property message is sent while the AICAL component is

locked.

Note: The channel {ch} message variable is ignored on devices with channels that are not individually

configurable.

Refer to the Analog input calibration messages on page 12 for details about the AI calibration messages .

Calibrating analog outputs

To modify the analog output calibration settings, complete the following steps:

1. Send the "AOCAL:UNLOCK" message to lock the AOCAL component and put the device into

Calibrate Mode.

When the AOCAL component is unlocked, sending a message to any component other than AOCAL

will lock the AOCAL component.

2. Send the "AOCAL{ch}:SLOPE=value" message to set the slope for the current range setting.

3. Send the "AOCAL{ch}:OFFSET=value" message to set the offset for the current range setting.

4. Send the "AOCAL{ch}:VALUE=value" message to set the value of the AO channel being calibrated.

5. Send the message "AOCAL:LOCK" to lock the AOCAl component and exit Calibration Mode.

6. The device returns INVALID if any AOCAL property message is sent while the AOCAL component is

locked.

Note: The channel {ch} message variable is ignored on devices with channels that are not individually

configurable.

Refer to the Analog output calibration messages on page 16 for details about the AO calibration messages.

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Measurement-computing DAQFlex Bedienungsanleitung Seite 11