[time-nuts] Very slow freq. counter / event counter
albertson.chris at gmail.com
Fri Apr 18 17:48:09 EDT 2014
On Fri, Apr 18, 2014 at 2:27 PM, Tom Van Baak <tvb at leapsecond.com> wrote:
> This chip does what you want: http://leapsecond.com/pic/picpet.htm
> Input frequency is 0.01 Hz to 100 Hz. Output is microsecond time-stamp and
> event-count over RS232.
> You use a PC to log and process the data (into frequency, period, counts,
PCs can do that without the chip. Connect the pulse to the DCD line of an
RS232 port and it will get logged with a uSec timestamp. It works for any
frequency from maybe 1kHz to 0Hz.
The port tolerates volts from -12 to +12. I don't think you need any add
chip to log pulses.
Redondo Beach, California
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