Urgent problem! Help, please. digitizer high-speed, too long channel switching time!

Dear all experts of digitizer high-speed OR:

I have a question about the two channel configuration using NI5154 digitizer (see need help to set up an acquisition of two channels using NI5154).

As we need to make a measurement with NI5154 purchase very soon so a suggested by Efrain such DAQ card is not an option for our next experience. So, I'm trying to configure the NI5154 acquisition of two channels. I have set up the NI5154 to count impulses to both channels. Our experimental set-up will send impulses to channel 0 to 400 ms, then stop. 100 ms later pulses from another source will be sent on the channel 1 to 2 s.  I thought that the dead time of 100ms in our configuration would be long enough for the digitizer switch between channel 0 channel 1. But after some testing, I found that the digitizer takes longer to switch between channels.

I did a test vi (NISCOPE - Timing.vi) just for the ms count how much it takes to the digitizer switch between channels. In the vi attached, if you run only one channel for a loop takes about 20 ms in my pc. If you run for the two channels, there are about 130 ms for a single loop. If you run a dual channel from the time of the loop is about 40 ms (I mean stop a channel and then re-run the channel).

I don't understand why it takes so long to switch from channel 0 channel 1.  As I have tested the niScope Commit.vi consumes a lot of time for the second string. Is it possible to avoid this? We cannot extend the time-out for a long time of 100ms of series up so I have to get rid of this problem.


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