303
PCMTec Edition Required: Any Editions.
To log up to 8 analog inputs (or 16 with a different cable) you can use the following analog input cable from DigiKey. It is approximately $45 + delivery. Free delivery if you spend over $60.
The driver is already included in the PCMTEC Editor installer so no extra software is needed. They do have a package on their website to test the cable separately to our software if you want which can be downloaded here.
To wire up your DLP cable you can read the datasheet here or follow our test pictures below.
Wiring
If you have 1 wideband, simply wire the ground to the ground pin, wire the positive input to pin 1, and next loop the rest of the input pins (2,3,4,5,6,7,8) to the ground to stop the signals from floating. You don't have to do this, but the inputs will likely read 5v if you don't.
If you have 2 widebands, simply do the same and wire the second sensor to pin 2 and remove the ground loop from pin 2.
Here we have looped the ground pins on input 5-6-7-8-GND to stop the signals from floating.
Ensure drivers are correctly installed. If not then use this direct link.
It should look like this inside Device Manager:
In PCMTec Datalogger, press the DLP button in the Data Logger screen to connect to the cable. Next select which of the 8 analog inputs you would like to log here:
To change the description/units press F2 to enter Edit mode, then click in the Units field and type the new Units.
To modify the voltage lookup table right click and pick "Equation".
You can enter a new voltage lookup table here to suit your wideband etc. 5v = 5120 and 1v = 1024. E.g. 1024 * voltage = A/D count.
If you have data from your wideband documentation that for example specified 1.2 lambdas at 4.5v and 0.55 lambda at 1v you would enter the data as follows:
1v *1024 = 1024 A/D
4.5v * 1024 = 4608 A/D
So your table will be:
| 0 | 0.55 |
| 1024 | 0.55 |
| 4608 | 1.2 |
| 5120 | 1.2 |
| repeat | |
| 5120 | 1.2 |
This will clamp your lambda reading between 0.55 and 1.2 lambdas.
Display Range
To adjust the display range, right-click on the scalar and Adjust Range (or right-click on the chart scales).
You can then see the adjusted range in the chart.
