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Messages - Jinghao

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DAQ Software/Firmware / Re: DAQ PCB data link led flickering
« on: April 21, 2017, 04:42:41 PM »
Hi Daniel,

Thanks for the reply and the advice.

I have another cmos, and that also makes the led flicker, so in addition to the other pairing (second DAQ with first cmos), it is most likely the DAQ pcb is not properly functioning.

2nd DAQ + 1st cmos, and shaking the coax cable does not render flickering.

All switches are in position.

I always test coax cable with a multimeter before connecting to the DAQ pcb, and it was good before this problem or after. But probably the connection of the coax was not stable, which caused the sudden huge current in the chips.

I read through the circuit diagram, and checked the 914A chip on the DAQ pcb. I have several guesses: 1. The v3p3 might be unstable; 2. the LOCK on 914A might oscillate between H and L. I will find some time to test whether the voltage is stable. If stable, does it mean that somewhere of the chip is malfunctioning?

Thanks for the help.

DAQ Software/Firmware / DAQ PCB data link led flickering
« on: April 20, 2017, 04:42:18 PM »
I come across an issue of flickering data link LED on the DAQ board, which keeps the miniscope from connected (same mscam retrieve error as expected). The board was OK before yesterday but it ran into this flickering problem today.

I tried connecting with the same coax cable&connector, same miniscope, same USB3.0 cable, and just a different DAQ board, the LED stays solid on and everything was fine, so it seems some issue with the pure DAQ PCB.

I am wondering if I can get some advice from you about the potential solution to this issue.

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