In an EDN post titled When wires become components, you can see the care that goes into making calibration-grade resistors and inductors. Today, we'll get a look at test equipment that remains in products after many years.
At IET Labs, as at most companies in the calibration and metrology business, you won't find the latest, coolest electronic equipment. You will find equipment that has been manufactured the same way for decades. That because new isn't always better. Calibration people are a skeptical group for whom "new" equates to "unproven." A proven history of measurement quality overshadows the latest digital technology.
In addition to seeing many decade boxes, I saw a megohmmeter that's still made with a vacuum tube (see the first video after the sideshow), reference capacitors used as capacitance transfer standards, and reference inductors. The second video below shows how to perform a comparison of a reference inductor to an unknown inductor.
The last few slides in our slideshow tour of IET Labs were taken in the front lobby. There are all kinds of equipment there, some dating back to before you were born.
Click the image below to open our slideshow.
A megohmmeter manufactured by IET labs still uses a vacuum tube. "We'll manufacture these meters for as long as we can get the tubes," said electrical engineer Joel Goldberg.