patelldp
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- Jan 23, 2009
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I need some help with monitoring a transducer with an RDAS Compact. The transducer is a 0-2500psi Statham unit with 28V excitation that has been proven using my Dataq DI-145. I reconfirmed today that the transducer is working appropriately with my Dataq...0V when open, then 3.75V when the test leads are connected (75% of full 5V) as expected.
The issue arises when I attach to my RDAS. The RDAS has a serial port, but I decided to simplify by connecting to the RDAS with simple jumpers. I attached the positive output from the transducer to the #7 pin (red jumper), and the negative output from the transducer to the #13 pin (brown lead).
After all physical connections were made, I did the following:
1. Stood RDAS vertical
2. Powered RDAS with 9V, allowed to boot
3. Powered the transducer
4. Shorted the test leads on the transducer (per above, should report 3.75V)
5. Flipped RDAS upside down, then twisted the unit in order to trigger the g-switch
6. Allowed unit to sit for a bit after detecting launch while moving it a bit
7. Powered down RDAS, removed connections, then hooked up to computer and downloaded the "flight data"
Within the flight data (which appeared normal, but it's here), the ADC 0-5 selection buttons at the top of the window are grayed out, meaning no data collected. It's my understanding that there should be evidence of when I shorted the test leads and a steady 3.75V throughout the duration of the "flight."
TL;DR: Transducer works with Dataq, RDAS does not record. May be issue with connection to RDAS serial expansion port?
Help!
The issue arises when I attach to my RDAS. The RDAS has a serial port, but I decided to simplify by connecting to the RDAS with simple jumpers. I attached the positive output from the transducer to the #7 pin (red jumper), and the negative output from the transducer to the #13 pin (brown lead).
After all physical connections were made, I did the following:
1. Stood RDAS vertical
2. Powered RDAS with 9V, allowed to boot
3. Powered the transducer
4. Shorted the test leads on the transducer (per above, should report 3.75V)
5. Flipped RDAS upside down, then twisted the unit in order to trigger the g-switch
6. Allowed unit to sit for a bit after detecting launch while moving it a bit
7. Powered down RDAS, removed connections, then hooked up to computer and downloaded the "flight data"
Within the flight data (which appeared normal, but it's here), the ADC 0-5 selection buttons at the top of the window are grayed out, meaning no data collected. It's my understanding that there should be evidence of when I shorted the test leads and a steady 3.75V throughout the duration of the "flight."
TL;DR: Transducer works with Dataq, RDAS does not record. May be issue with connection to RDAS serial expansion port?
Help!