QiwenSheng

Hi Clement, Thanks for asking. Unfortunately, I'm still trying to solve this issue. For my case, I need to connect with an operational amplifier or switch to a new photodetector with integrated amplifier. Hope this helps. Qiwen

Hi Fausto, Thanks for your response. Yes, I have two signal sources; one is connected to a function generator, and the other one is connected to a photodetector. "Switch to the photodetector" refers that the acquired data from DAQ is correct when "CH0" and "CH1" are both connected to a function generator, but when I connect "CH1" to a photodetector, the acquired data shows incorrect value. I think I may need to get an operational amplifier to make my DAQ work properly. Thanks for you assistance. Qiwen Sheng

Hi Fausto, Thanks for your quick response. 1. The blue signal is from the channel 0, and the red signal is from the channel 1. I agree with you that the channel 0 shows correct data. 2. "Original data" is created by oscilloscope. 3. I connected the +5V terminal to the CH0 and CH1 terminals. The data obtained from these two channels are both around +5V. I think both channels are good. I also connected CH0 and CH1 to a function generator. The obtained data is consistent with the function generator output. The issue may come from the red signal source. The CH1 terminal was directly connected with a photodetector (Thorlabs - DET01CFC 1.2 GHz InGaAs FC/PC-Coupled Photodetector, 800 - 1700 nm, 8-32 Tap) via a sma cable. When I switch to the photodetector, the obtained signal shows unexpected increase. I can't understand why this does happen. Is there possible way to solve this issue? Thanks a lot.

Hi Fausto, I added the short wires. I also tried different channels with SE mode. I still cannot get the right results. It is same with what I got before. Is this DAQ out of order? Thanks. Qiwen

Hi Fausto, Thanks for your help. Should "Add a short wire between the channel high screw terminal (CH#H) and AGND" be connected in the skipped channels or the tested channels? I am using the SE channel mode.

I used DAQami to record data with a sampling rate of 20K. The DAQ is USB-1608GX-2AO. I used two channels CH0 and CH1 with Single-Ended mode. However, I cannot get data correctly. Attached are the original data and the data exported from DAQ. Could you please provide me with any suggestions to get the right data? Thanks

Hi Fausto, I still cannot find the "cb.cfg" file, even reinstalling the InstaCal. Are there other ways to generate "cb.cfg" file? Thanks a lot.

Hi Fausto, Thanks for your information. When I was running my code on Windows 11, a UL error occurred. Code: 126 Message: Cannot find CB.CFG file. I also checked the 'C:\Program Files (x86)\Measurement Computing\DAQ'. I didn't find the CB.CFG file. Is there any method to generate the CB.CFG file? Thanks a lot. Qiwen Sheng

I am reading the Vout01.py Python sample. Does the USB-1208FS-Plus have the D/A converter? Thanks. Qiwen Sheng

Thanks a lot for your help. Qiwen

Hello Fausto, Thanks for your quick response and information. I would like to input the digital signal to the DAQ first, and then obtain the analog signal from the analog output channel. The DAQ functions as a digital-to-analog converter. Could it work for the USB-1208FS-Plus? Thanks a lot. Qiwen

Hello, I am trying to get more details for the USB-1208FS-Plus: 50 kS/s sample rate, 12-bit resolution. In my project, I need to transfer the digital signal to the analog signal. For the two analog output channels, is the analog output from the DAC? I would also like to use python to control the DAQ. Does the DAQ support the remote control with python? Thanks a lot.