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time measurement using pci 6602

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Hi,
I m using pci 6602 for time measurement of a pulse coming from some time programmed device. The measurement order is in seconds and the accuracy will be 0.1s.
the pulse is an output of some relay which is being operated by this device. this relay output is being given to GATE0 (PFI38) input of PCI 6602, but the time measurement is not being possible, whereas once if we provide a TTL pulse from some DIO line (i.e. turming on/off a DO line) to the same input of GATE0, the time is being measured accurately.
 
can u plz. look into the problem and suggest some solutions.
 
Regards
 
GNS
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See my reply here.
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Michael P
National Instruments
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