Snap-In module HSC frequency measurement

[Flex727]

Can someone verify for me that the frequency measurement performed by a V200-18-E1B HSC reads out directly in Hz, with no implied decimal, such as obtained from a thermocouple?

[Gabriel Franco]

Long time ago I used frequency measurement using V200-18-E3XB and it gives Hz directly with no decimals. Had to wire both I0 and I1 to the same encoder output to achieve it

[kratmel]

It is in Hz for High Speed Counter

As far as I remember, with Shaft encoder, it is 2 or 4 times larger, depending on the selected encoder.

[Flex727]

Thank you both.

[John_R]

Flex, you're reading frequency with a thermocouple?

I've never tried that...😁

[Ausman]

Yeah John,

you hold the cable and swing it in circles in your hand, and it senses the changes in the earth's magnetism each time it goes round and gives you Hz.

That is....it gives you hurts if you mistime the swing and it hits your head. 

[John_R]

Well, I'm using type T thermocouples out in my home workshop for climate control, as well as one outside so I can check the outdoor temp from in the house (via Remote Access).

I seem to have a problem with accuracy on the outdoor T/C though, mostly because at times it is influenced by the position of the sun.

Perhaps if I mount the T/C on the blade of a little windmill, that drives an encoder, then I can synchronize the read of the T/C with  the point of rotation that the T/C is blocked from direct sun by the other blades.

Now, do I put the T/C on the HSC inputs and the Encoder on the T/C input, or vice-versa?   🌞

[Joe Tauser]

The question has already been answered as "yes, the frequency on the basic HSC configuration is in Hz."  Integer hertz.

Little known Visilogic trivia- if you need frequency resolution greater than 1 Hz you can use the "Frequency Measurement based on HSC" function block cleverly located in the Utils->Immediate menu.  It returns frequency in 0.01 Hz resolution.  Very handy for speed control applications where you don't have the luxury of an encoder; i.e. a prox on a bolt sensing speed.

 

On 11/17/2022 at 3:14 PM, Ausman said:

That is....it gives you hurts if you mistime the swing and it hits your head. 

That's actually pretty clever.   😄

Joe T.

[Flex727]

Thanks, Joe.