Digital I/O

cancel
Showing results for 
Search instead for 
Did you mean: 

NI-9425 Clock Rate

I am currently attempting to change the clock rate on a NI-9425.  The module manual states that the rate should be 7us, but when I am testing it the rates seems to be locked down to 1kHz that is a far cry from the 140kHz that is defined on the speciifcation sheet.  Is there any method to change clock rate without using the FPGA module.

0 Kudos
Message 1 of 12
(2,849 Views)

What are you using as the clock? The 9425 should be capable of a sampling rate of 140kHz as you're saying, if it's using a clock set to said rate, and if it's not limited by any attached hardware. What hardware do you have attached to the module?

 

Andrew B.

Andrew B.
Application Engineer
National Instruments.
http://www.ni.com/support
0 Kudos
Message 2 of 12
(2,828 Views)

I have checked the clock on the associated hardware and it is correct.  When I attempt to set the clock using the clock icon I get an error about the device not being capable of operating in a buffered mode.

0 Kudos
Message 3 of 12
(2,820 Views)

Could you send a screenshot of how you're attempting to implement this in your code.

 

Andrew B.

Andrew B.
Application Engineer
National Instruments.
http://www.ni.com/support
0 Kudos
Message 4 of 12
(2,816 Views)

I have attempted both methods shown below.  The first gives me the buffer failure.  The second does not give an error but maintains the 1kHz sample rate.

Download All
0 Kudos
Message 5 of 12
(2,813 Views)

Have you tried explicitly wiring in a source to the sample clock timing function?

Andrew B.
Application Engineer
National Instruments.
http://www.ni.com/support
0 Kudos
Message 6 of 12
(2,787 Views)

How would I go about performing that?

0 Kudos
Message 7 of 12
(2,785 Views)

As shown in this VI snippet. Create a control or constant from the source. Then select which clock source you're looking to reference.

Andrew B.
Application Engineer
National Instruments.
http://www.ni.com/support
0 Kudos
Message 8 of 12
(2,780 Views)

Sorry it took so long to reply got called off onto something else.  Using sample clock gives the same you cannot use buffered device error.

0 Kudos
Message 9 of 12
(2,730 Views)

Could you attach your code, so I can try to replicate the issue on my end and debug from there.

Andrew B.
Application Engineer
National Instruments.
http://www.ni.com/support
0 Kudos
Message 10 of 12
(2,670 Views)