On Saturday 29 November 2008, Kirk Wallace wrote:
>On Sat, 2008-11-29 at 11:46 -0800, Olusegun A. wrote:
>> I'm actually trying to read an analogue signal (High Voltage - say
>> 1000VAC) being applied to my heavy motor. Do I need an ADC converter
>> or what is the procedure?
>>
>> Olusegun Abode
>> +234 8037045535
>> Email:[EMAIL PROTECTED]
>
>EMC2 only has single bit and encoder inputs. Through the bit input you
>can see if a bit is on or off, or you can count the bits, or measure
>their frequency or PWM. The encoder input is just two bit inputs that
>count quadrature encoder pulses. So if you want EMC2 to measure your
>voltage, you need to convert it to a bit form. For my voltage input, I
>used a serial ADC which converts a low DC voltage to a data bit stream.
>This bit stream goes into one parallel port pin, where an EMC2 module I
>created decodes the bit stream into a value that EMC can use wherever I
>need it.
>
>I suspect that you will need to do the same, except measuring AC at high
>voltage will be a little more complicated. You could try to use my
>setup, but you would need to convert your high voltage AC to a 0 to 10
>Volt DC signal. I am not familiar with how to do that. You might be able
>to use a multimeter that has a serial data port.
I haven't seen a modern digital multimeter rated for more than 750 volts in,
and knowing the size of the scaling resistors used in such an under $200
beast, I would not apply it for more than just long enough to take a reading,
2, 3 seconds maximum. Certainly it would not survive a steady application
for 5 minutes, of much over 150 volts.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The horizon of many people is a circle with a radius of zero. They call
this their point of view.
-- Albert Einstein
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