Product Focus - Pulse Conditioner

MODEL JH2376

PULSE CONDITIONER

Full-featured Model JH2376 is the "big brother" to our low-cost JH376/JH377 pulse amplifier & converter (blog posting Oct 10, 2009). Fully isolated and capable of handling voltages from 20mV to 250Vrms (700V peak-to-peak) it serves applications ranging from tachometers and flow turbines to power and VFD (variable frequency drive) frequency monitoring. The input is safely isolated and converted to a 5V logic pulse output.

Adjustable sensitivity and optional filtering allow the user to tailor the unit for each application, optimizing sensitivity and frequency response versus noise rejection. DIN-rail mounted, the JH2376 is available with 115 and 230Vac power options.

Here's a link to the spec sheet: JH2376 Pulse Conditioner

Our previously-announced pulse conditioners are:

• Model JH376 Pulse Amplifier. Millivolt inputs, dual channel, low cost, nonisolated.
• Model JH377 Pulse Converter. Converts 5V logic to open-collector and vice versa. Dual channel, low cost, nonisolated.

We also make:

• DC to Frequency Converters (Integrators: Models JH7500 & JH7501. JH7500, 5V logic pulse or open-collector output. JH7501, relay contact output, low pulse rates only. Plug-in style.
• Model JH7010I Frequency to DC Converter (Frequency Input Transmitter). Plug-in style, fixed range.
• Model JH7580 Frequency to DC Converter (Frequency Input Transmitter). Plug-in style, user-rangeable.
• Model JH5700 Frequency to DC Converter (Frequency Input Transmitter). DIN-rail mount, fixed range.
• Model JH1700 & JH1720 Frequency Input Alarm Trips. Plug-in style, fixed range. JH1700, single trip. JH1720, dual trip.

Signal Conditioners (our web site): http://www.jhtechnology.com/

Simple Special: Y = 1/X

Our customer needed a simple mathematical inverter: Output = (Constant) x (1/Input). Our standard product line includes analog division.

We simply disconnected input A and tied it internally to full scale.

The key requirement was that the user properly specify the input/output relationship. (Note that at 0% input the output would be 1/0 = infinity.) This application required:

Input = 1 volt, Output = 5 volts

Input = 2 volts, Output = 2.5 volts

Input = 5 volts, Output = 1 volt

Mathematically this is: Output = 5 / Input.

We tied input A to a fixed internal voltage and set the instrument's gain appropriately.

JH Technology offers add, subtract, multiply, divide, square and square root functions in plug-in modules, DIN-rail transmitters and field mount transmitter/displays.

http://www.jhtechnology.com/

Product Focus - Math Functions

• Add
• Subtract
• Multiply
• Divide
• Square Root
• Square Function

Special Modifications:

• Sum with unequal input weightings (for example, add flows from two different-size flowmeters or power from two different transducers).
• Unequal input & output ranges (for example, input = 0-10Vdc, output = 4-20mAdc)
• Output = A x B / C
• Alarms with math functions
• Others - let us know what you need

Available in plug-in, field mount and DIN rail styles.

 

Links:

Add/Subtract Plug-In Transmitters

Add/Subtract Field Mount Transmitters

Add/Subtract DIN Rail Transmitters

Multiply/Divide Plug-In Transmitters

Multiply/Divide Field Mount Transmitters

Multiply/Divide DIN Rail Transmitters

Square/Square Root Plug-In Transmitters

Square/Square Root DIN Rail Transmitters

Our signal conditioner web site: http://www.jhtechnology.com/

E-mail: jhtek@jhtechnology.com

Phone: US toll free 800-808-0300, or 941-927-0300

True RMS Measurement Includes DC

Simple Modifications meet Customer's Needs

When measuring AC voltages, DC components or offsets usually should be ignored. Examples include measuring AC ripple from a DC power supply, and data or audio signals superimposed on DC power lines. As shown in the figure, a blocking capacitor removes any DC component.

Therm-O-Link, a wire manufacturer in El Paso, uses rectified but triac-modulated power in their annealing operation. To monitor and control the annealing process they need to know the total voltage, DC plus AC. They also need true-RMS measurement for accurate power monitoring regardless of the waveform.

A simple modification to our true-RMS process transmitter, Model JH6010IR, removed the blocking capacitor for full DC response. Additional changes speeded the transmitter's response time for proper operation in their control system.

For the complete application note, True RMS: AC or DC Response?, click here.

True RMS Measurement Basics

RMS measurements express the power capability of an AC source. Low-cost meters and transmitters often make a simpler average measurement rather than true RMS. The two are not the same, and the relationship between average and RMS measurements varies for different waveform shapes. The figure shows a pure sine wave, a chopped and rectified sine wave and a square wave pulse.

True RMS measurements require more complex and expensive circuitry, generally available in slightly higher priced instruments.

To learn the fundamentals of RMS measurement click for our application note, What is True RMS - and When do I Need It?


JH Technology manufactures:
Plug-In True RMS AC Process Transmitter
DIN Rail Mount True RMS AC Process Transmitter
Field Mound True RMS AC Transmitter with Display
Plug-In AC Alarm Trips with True RMS Response

Our web site: http://www.jhtechnology.com/

Why We Like "Small" Customers

You've probably heard the old "80 -20" rule - 80% of (xxxxx) come from 20% of (yyyyy). As applied to marketing, 80% of your sales come from 20% of your customers; therefore, you should focus the bulk of your efforts on the 20%.

Well, of course, we do pay attention to our larger customers, but we work just as hard to meet the needs of new and small users. Why? First, it's in our nature, but its also good for business. Here's our favorite success story.

In 2001 an engineer named Mike Sanders found us and asked if we could meet a special need - a 2-input load cell (strain gauge) transmitter. That's not one of our standard products, and he only needed a couple, but we found a way to modify our standard strain gauge transmitter (Model JH4051) to meet his needs. Small order, but we did it.

Jump forward to December 2002. Mike called us. He'd joined another company, Wave Biotech, who made mixing and packaging equipment for the pharmaceutical industry. Their product included four load cells and he had ideas which could improve it. His needs included the ability to accurately sum either three or four load cells, to choose either of two output ranges, adjustability/rangeability per specific requirements, and filtering - just enough to smooth the signal while maintaining a reasonably high response speed.

We built a quick prototype. He tested and liked it. We finished the design and laid it out on a circuit board to fit a cavity in their machine.

The result? They became our biggest single customer (in dollars). GE bought the company and moved the operation to Sweden in 2008. During the move we worked with them to improve EMI/RFI specs. They're still our customer and their orders remain as strong as ever.

Here's a link to their "how it works" page.

The US operation closed, unfortunately, but we still hear from Mike.

Here's a link to our Customs and Specials page. What can we do for you?

Our main web site (signal conditioners): http://www.jhtechnology.com/

2010 - A good year after all

Happy New Year -

But for us, the old one turned out well, too.

2009 had been slow - no surprise - down 31% from our 2008 peak. The first 3 months of 2010 were equally bad - actually, worse - but then things turned around. Bookings (orders received) were our best year ever, 6% above our 2008 record. Shipment fell a bit short, but only because two customers asked that their large orders be held until January.

A few OEM customers whose orders had slowed significantly in 2009 came back strong. A couple new product offerings also helped: our fast-response transmitter line and our new tachometer pulse amplifier. Also, we added 46 first-time customers. (Some probably will be one-time-only, such as distributors ordering specific items at the request of their customers.) Our thanks to all, new and old.

One caution - some of the months were strong only because of one or two large orders. Without them we would have remained slow. Any predictions for 2011?????

Hope your 2011 goes well!

http://www.jhtechnology.com/

Happy Winter Solstice!

Yes, today (Dec. 21, 2010) is the first day of winter. We can tell. Here in Sarasota we've had bone-chilling temperatures in the 40s and 50s (Fahrenheit, of course) and on a couple evenings it even dipped into the 30s. But, your writer (Harry) grew up near Buffalo, so I guess I can handle it.

Holiday Greetings.

It's a wonderful time of the year, whatever your beliefs. I was raised in the Christian tradition. So (and without any commercial benefit whatever, since I don't believe many people give signal conditioners as Christmas presents), I'm not ashamed to say:

Merry Christmas.

Christian beliefs include the Old Testament. Hannukah celebrates religious freedom. Judas Maccabeus led the revolt which restored the right of the Jews to practice their religion at the temple in Jerusalem. Hanukkah celebrates the miracle that one day's worth of lamp oil lasted 8 days. So, to our Jewish friends includng Bea next door and Myra and Stan down the steet, I wish you (belatedly):

Happy Hanukkah.

Kwanzaa, while not a religious holiday, celebrates the 7 principles of Unity, Self Determination, Collective Work and Responsibility, Cooperative Economics, Purpose, Creativity and Faith, wonderful guiding principles for communities of any  belief or nationality. To our friends who celebrate it:

Joyous Kwanzaa, and Habari Gani?


I once worked with a fellow who claimed to be a Pagan. Of course, the timing of the Christmas celebration and some of its traditions (such as the Christmas tree) evolved from pagan winter solstice traditions (which is part of the reason the early Puritans forbade its celebration), So to all of you who may be pagans, non-religious or perhaps just tired of the excesses of the season:

Happy Winter Solstice.

(My apologies to those of other beliefs that I am not familiar with.)

And - an early Happy New Year from Harry and all of us at JH Technology.