PaulGruet

Hi John, Thank you for coming back to me. We have found this issue on many examples of the DT9805 old and new. Running a long data acquisition. Stopping it, then starting another one is the most likely scenario to cause the problem, but it does equally just occur mid data acquisition at random times. Temperature is not an issue, we see the issue at normal room temperature i.e. around 20 degrees c. There are no covers on the instrument which is well ventilated, Although it is a fire test instrument I am running dummy tests so no heating is involved. In any case all electronics are well separated from heated areas. After the USB has dropped, the calling application (our software or QuickDaq) cannot be closed from task manager. A soft reboot does not cure the problem and the application is still shown in task manager as running Only a hard reboot (press and hold the PC power button) closes the application. This to me is consistent with a driver crash/hang where the driver is waiting for a hardware action to complete. My tests this time around were on a brand new unit after a customer reported this issue with a different (brand new) unit in the field. It was me that reported the issue in 2019 and it has never been resolved since then, only now we are again getting high level complaints from customers who have been experiencing this issue for a while.

Hi , We use the DT9805 as the data acquisition module of a fire testing instrument. The tests carried out by this instrument are destructive and often at considerable material cost to our end users. We are experiencing a number for customer complaints due to the fact that the DT9805 USB connection drops on average once an hour for our end users causing them considerable problems. This is on a newly supplied instrument.. Tests carried out at the factory with other new, out of the box DT9805 units confirm this problem. We are testing with a direct connection to the PC (i.e. no hub) and have had similar results for both USB 2 and 3 ports. The problem is observed using both our own software and also Measurement Computing's Quick Daq software. In both cases the failure mode is the same. The application freezes and cannot be killed from Task Manager (Access denied). In device manager the DT9805 device disappears and is replaced by an unknown device which Windows marks as a bad device. Driver version is 7.0.0.8 15/1/2019 which appears to be the latest on your site. Open Layers version is 7.8.9 This is a problem which has been experienced many times in the past and for which we have never been given a satisfactory solution. However this customer has now escalated to director level and a fix is now imperative for us. The difference is now that we have the problem being reqularly observed with QuickDaq software on several examples of the unit. I have attached some screenshots illustrating the failure mode Please advise how this matter may be resolved quickly Best regards Paul Gruet DeviceError.txt