[sdiy] Harris Data Memory?

[Michael Ruberto]

Larry,



>
>Harris is currently owned by GE.  They supply mostly electric utility
>monitoring and control equipment.

after opening the device I found a label inside saying it was manufactured 
in England so it's possible this Harris isn't the one we are thinking of.

  I have seen a fair amount of the modern
>Harris equipment.  I have not seen anything like this.  My guess is the
>sampling interval can be measured in seconds or minutes as opposed to
>something that would support audio frequencies.  I say that because of the
>output nomenclature.

the unit isn't modern from the look of it. it's constructed of the same 
plastic material as an EDP Wasp. you are correct about it not being useful 
for audio frequencies. the intervals are from 1000/second all the way to 
3/week. even at 1000/sec rate sampling audio would not produce a useful 
output.

I think they do make some "high speed" sampling
>devices classified as digital fault recorders.  But, they typically have a
>serial port dump.  So, this sounds like something designed to monitor slow
>changing events.  But, it might be cool for some kind of weird sample and
>hold or sampling sequencer. :)

It definately would be interesting to try using it for such an application. 
one limitation will be it's output level which is marked as being 0-1V. I 
did notice something very interesting though, an input for an external clock 
and the clock range switch has a position for that input as well as a manual 
mode where it can be clocked from a pushbutton on the panel. I am curious 
about just how much memory the thing has. on the front panel the memory 
indicator goes up to 512. but is that bytes or kilobytes? considering the 
apparent age of this unit I'm afraid it may be bytes.
I found a problem with the unit too. the power transformer is mounted to the 
plastic chassis with some rivets which have come loose and the transformer 
wobbles around. this has cause all the thin wires on it's secondary side to 
break off the terminals. I'm going to have to figure how they were 
originally connected.

~M

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