RadiMation Application Note 114
How to measure data from the EUT using the Configurable AD Convertor device driver[edit]
This Application Note explains how a configurable AD convertor can be used to monitor an EUT. With the AD convertor, any type of signal can be monitored and plotted within RadiMation during a test.
- First the AD convertor must be configured so values can be read within RadiMation.
- Second the value must be plotted during a test using the correct unit types.
1 Configuring the AD convertor[edit]
1.1 Specify the communication type [edit]
First the communication type must be configured. Multiple communication types can be selected.
1.2 Configure the initialization of the device [edit]
 Reset
|
The reset code that needs to be send to device. When left blank no command will be send. |
| Init
|
The command that is send to initialize the configured device. When left blank no command will be send. |
| Get Id
|
The command that is send to retrieve the ID of the device. This is used to check if the device is connected. A common used SCPI command is *IDN?. When left blank no command will be send. |
| Returned ID
|
The identifier is used to check if the correct device driver is selected and the device is connected. Leaving this blank will skip the device check. |
| Deinit
|
Specifies the command that is send when the device is no longer in use. Leaving this blank will keep the device in its last state after controlling it. |
A checkmark can be enabled so RadiMation will wait for all the commands to complete. This is done by sending SCPI command *OPC? to the device.
1.3 Configure the data readout of the device [edit]
AD convertors can have multiple channels on which AD values could be read. For each AD channel, individual commands can be set.
Trigger and Reading[edit]
| Trigger
|
A trigger command can be specified to request a measurement from the device. A common used SCPI is *TRG. When left blank no command will be send. |
| Read Back
|
Different devices return different messages with measurement values. The configurable AD convertor only need the numeric value of the measurement message. There for, a regular expressions can be set in the Read Back.
A good regular expression for finding the first number in scientific notation in a text is: ([+-]?[0-9]*\.?[0-9]+([eE][+-]?[0-9]+)?) For more possibilities see the example section. |
Minimum and maximum value[edit]
Minimum and maximum can be set to limit the measured value. And to calculate the measured value to a specific unit.
| Minimum value
|
The lowest value that can be measured with this device. The value must be the same as filled in the EUT window. |
| Maximum value
|
The highest value that can be measured with this device. The value must be the same as filled in the EUT window. |
1.4 Examples [edit]
Received information
|
Regex
|
RadiMation Readout
|
Note
|
|---|---|---|---|
| U_L_N 325 | (-?[0-9.,Ee-]+)
|
325
|
Takes the first number.
|
| I_L1;12.34 | ;(-?[0-9.,Ee-]+)
|
12.34
|
Takes the first number after ";".
|
| THD_U_L1;;14,5 | ;;(-?[0-9.,Ee-]+)
|
14.5
|
Takes the first number after ";;".
|
| AC_FREQ;Channel1;1.23E3 | ;*;(-?[0-9.,Ee-]+)
|
1230
|
Takes the first number after the appearance of a second ";".
|
Read backs can always be tested trough the "Validate Expression tool"
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2 Plotting the AD Convertor data with the correct unit type[edit]
- The monitoring functionality is applied to the EUT. Therefor we first need to have an EUT file opened.
- In the opened EUT file, we can select the Monitoring Input Devices tab.
- At the device menu, the newly configured AD convertor can be selected.
- The selected AD channel must be selected.
- The Unit type can be specified as text.
- With Calculation, the raw value from the AD convertor can be modified to match the preferred unit. If none is selected, the raw value is used.
- The Monitoring Input channel description will be shown in the graph title.