Problems with USB ADC-11/12 and too big values

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Harald Weber

Problems with USB ADC-11/12 and too big values

Post by Harald Weber » Fri Oct 28, 2005 11:06 am

I write a software to measure 10 channels with USB ADC-11/12. If I measure, I get some values which are too big. The values are 0xFFFF (65535). What does this mean. My code seems to be ok.

Code: Select all

no_of_channels = 10;
channels[0] = 1;
channels[1] = 2;
channels[2] = 3;
channels[3] = 4;
channels[4] = 5;
channels[5] = 6;
channels[6] = 7;
channels[7] = 8;
channels[8] = 9;
channels[9] = 10;
adc11_open_unit(101, 111);
max_adc_value = adc11_max_value();
if (!adc11_is_streaming()){
adc11_set_trigger(false, true, 1000, 0, false, 80, -10);
actual = adc11_set_interval (1000000, 1000, channels, no_of_channels);
adc11_run (10000, BM_STREAM);
while (!adc11_ready ()){
    Sleep (100);
while (!Terminated){
     no_of_values = adc11_get_times_and_values (times, values, 100000);
adc11_stop ();
Best Regards
Harald Weber

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Posts: 656
Joined: Thu Jul 07, 2005 12:41 pm
Location: St Neots, Cambridgeshire

Post by Michael » Tue Nov 01, 2005 4:19 pm


The drivers for the USB ADC11 have been recently updated.

Try downloading the dirvers from our website and let me know how you get on.

Best regards,
Michael - Tech Support
Pico Technology
Web Support Forum

Harald Weber

Post by Harald Weber » Wed Nov 02, 2005 8:18 am

Hello Michael,

I loaded the new Driver from your website, but the result is the same as before.

Best regards,

Harald Weber


Post by Sarah » Tue Nov 08, 2005 9:49 am

Hi Harald

Thank you for your post.

If you use Picolog do you still get these high readings?
At what point do the readings occur? Is it all the time or just at the beginning or a certain time?

If you can let me know some more information then this will help us find the root of this issue.

Best Regards


Me Too!

Post by AndyC » Thu Nov 10, 2005 4:52 pm

I get this too!
I downloaded the new drivers this afternoon.
It looks like the first 6 values returned from adc11_get_times_and_values are often 65535.

When I use the demo program to stream the data, I get loads of discontinuities in the log file. I thought streaming was supposed to get round this?

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