Last March we went over the basics of how a pulse functions. Although this seems like a complex topic, the pulse is actually quite simple. This month we are getting into the somewhat confusing topic of 2-Wire vs. 3-Wire pulse values, also known as Form A and Form C. What’s the difference, which one to use, how to calculate, and specialty situations will all be covered in the article below.

But let’s not forget our newest little members to the SSI family are also featured in this month’s Product Spotlight. The LCR-3A and LCR-4 are small relays that can handle a lot! Read on to see what they can do for you…

Feel free to send us an email at if there is a pulse related topic you would like to know more about, and we’ll work on getting it into one of our upcoming newsletters.

2-Wire or 3-Wire... That is the Question

Probably the most confusing part of Pulse Metering is the misunderstanding of 2-wire and 3-wire pulse values. Almost universally, pulse metering revolves around 3-wire pulse values given that historically it took 3-wires for pulse metering to work. Over time, pulse metering has become mostly a...

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Product Spotlight:
Little Relays
that Pack a Punch!

Our new LCR-3A and LCR-4 Auxiliary Load Control Relays have arrived! These little relays do the big job that many small KYZ switches can't handle. Housed in a 1" epoxy cube with 18" leads for input and output terminals, the LCR-3A can accomplish the task of switching loads that are heavier than many meter devices are able to switch. The LCR-4 is slightly larger, 2" x 1.5" x .75, and allows either AC or DC loads to be controlled. Although small in stature, don't be fooled…

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Contact the KYZ Pulse experts at Solid State Instruments for help on any pulse metering applications. We have the most extensive line of Pulse Isolation Relays, Pulse Totalizers, Pulse Links and Specialty Pulse Products on the market.

We're all about K, Y and Z!