Trigger below zero

Hi,
I use
NI-6111 (NIDAQmx) since 2 years to start a test, by triggering over a rising
voltage over zero (ca 0.5 V ).
Everything worked fine, until now!
I tried to change this trigger voltage to a value below zero (ca. -0.2 V). It doesn’t
work anymore; I can not find any parameter in DAQmx witch limits the Trigger
Voltage.
use the following functions:
DAQmxCreateAIVoltageChan( hd, 'Dev1/ai0', '', DAQmx_Val_Cfg_Default, -5, 5, DAQmx_Val_Volts, NULL)
DAQmxCfgSampClkTiming( hd, '', SampleRate, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, NrOfSamples)
DAQmxCfgAnlgEdgeRefTrig ( hd, 'Dev1/ai0', DAQmx_Val_Rising, -0.2, NrOfPreTrigger)
DAQmxStartTask( hd )
DAQmxReadAnalogF64( hd, -1, TimeOut, DAQmx_Val_GroupByChannel, @data, NrOfSamples, @count, NULL)
hassan

hello hassan,
according to the specifications (page 9f) of the 6111, it should not be a problem to trigger on voltages below 0V.
(http://digital.ni.com/manuals.nsf/websearch/A9694D34EF10469386256E3000539747)
kind regards,
robert h
NI germany

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Could you please edit your post and use formatting and tags. This is pretty much unreadable and the forum boogered up some of your code.
Instructions are here: http://forums.oracle.com/forums/help.jspa

Trigger below zero

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