How We Made Insulation Testing Faster — And Why It Had to Change
It’s 35 °C in the shade — you’re on site, low on water, and the pressure’s on. You’re testing insulation resistance at 15 kV in tough conditions. But the job doesn’t stop just because the weather’s against you. You still have to wait for the reabsorption currents to dissipate before running the next test — and according to IEEE guidelines, that could mean another 40 minutes on standby.
That’s how it’s always been.
Until now.
Retesting Slows Everyone Down
Whether you’re working for a utility, an industrial site, or a service contractor, one problem keeps coming up: testing delays cost time, money, and momentum.
We spoke to technicians across sectors, and the feedback was consistent:
- “I waste an hour just waiting to retest.”
- “The readings get noisy — I don’t trust them.”
- “I want to know earlier if something’s wrong.”
- “We need gear that keeps up with the crew, not the other way round.”
Why Retest Time Matters to Everyone
For field engineers, slow retests mean lost hours, broken workflows, and longer reports.
For operations managers and buyers, it means missed deadlines, overtime bills, and underused teams. If you run a service business, it can cost you jobs. If you’re managing maintenance, it stretches your repair window.
“Faster and reliable insulation testing isn’t just a technician’s dream — it’s an operational advantage that keeps teams moving and businesses on track.”
A New Approach to Insulation Testing
We didn’t just improve the spec sheet. We rebuilt around what the field needed most: speed, safety, and trust in the result.
Re>Act Mode — Retest in 10 Minutes
You’re often forced to wait up to four times longer than the test itself — not because the job’s done, but because there’s no way to monitor when the charge has fully dissipated. And since insulation discharge time varies by application, you have to assume the worst-case scenario. That’s why IEEE Std 43 recommends a discharge time equal to four times the test duration — which could mean waiting 40 minutes or more before running the next test.
Re>Act Mode changes that. This patent-applied-for feature actively monitors the reabsorption current and safely discharges the unit, so you can test again in as little as 10 minutes — without compromising safety.
It also gives you live feedback on the insulation’s behaviour, as it happens. So you don’t just see the final number. You understand the trend.
PI Predictor™ — Know Sooner
PI Predictor ™ gives you an early estimate of your PI value before the full test is done. That means less waiting, better decisions, and more control.
Both features are exclusive to Megger and patent-applied, because no one else has built their insulation testers this way.
Designed for the Field — Not the Lab
We all know how rough the job gets. That’s why we made the new generation of testers with:
- Bright colour screens with sunlight readability
- Noise filtering for accurate results in tough environments
- Category-rated terminals and remote operation for safety
Faster insulation testing for smarter workflow
This isn’t a minor upgrade — it’s a rethink that cuts wait times, adds insight, and brings insulation testing in line with real-world demands.
Whether you’re chasing a deadline, stuck in bad weather, or managing a team across sites, these testers are built to work the way you do.
Because real conditions need real solutions — not just better specs.
Ready to find the right fit?
Three performance levels for one smart choice
Choose from:
Essential — For straightforward, no-fuss testing
Advanced — For tough environments and smarter filtering
Expert — For high-noise sites, full diagnostics, and maximum performance
Frequently Asked Questions
The standards recommend waiting four times longer than the test itself to allow for discharge — because there’s no way to know when it’s safe to retest. Megger’s patent-applied-for Re>Act Mode changes that. It lets you monitor the reabsorption current in real time, so you can safely retest as soon as the charge has dissipated.
Yes. PI Predictor™ from Megger gives you an early PI estimate, saving time and helping you make faster decisions.
Both Re>Act Mode is patent applied for, and PI Predictor™ innovations developed by Megger, based on real field feedback.
