EXFO MaxTester 730c FAQ: USB Power, Unlocking & Common Issues

EXFO Testers: What You Really Need to Know

I've handled over 60 emergency fiber fault incidents this year alone. When you're on-site with a 2-hour window to clear a fault, there's no time to fumble with equipment settings. Here are the questions that come up again and again—answered straight, no filler.

What is the EXFO MaxTester 730c used for?

The EXFO MaxTester 730c is an all-in-one optical test platform. It combines a full-featured OTDR, a power meter, a light source, a visible fault locator, and a fiber microscope in one rugged field unit. I've used mine to troubleshoot everything from a 12-fiber break in a downtown conduit to a single-mode connector contamination on a rooftop CPE. It's not the cheapest OTDR on the market, but when you need to leave a job site with certainty, you pay for reliability—not just the lowest price tag.

How do I power the EXFO 6300 via USB while recording a list?

This is a pain point I've run into myself. When you're using the EXFO 6300 (or the MaxTester 730c) to record long measurement lists—say a 24-hour DWDM channel monitor—USB power delivery can drop out. The trick: use a USB-C PD (Power Delivery) source that supplies at least 15 W (5 V / 3 A is common). Cheap 5 W phone chargers won't cut it. I've tested three different power banks, and only the Anker 26800 with USB-C PD kept the 6300 running through a full 12-hour recording session without a hiccup. Also, skip the coiled USB cable—they introduce too much resistance. A short, high-gauge cable (like the one in the EXFO accessory kit) works best.

How to unlock a phone? (And why I hear this question so often)

Let me rephrase that: what people actually mean is "How do I unlock the touch screen on my EXFO MaxTester 730c when it's locked during a test?" It's a common moment of panic. The device auto-locks after a period of inactivity (default is 5 minutes). To unlock—just tap the screen firmly with your thumb, then slide the lock icon. That's it. But the real unlock trick: in the Settings menu, you can disable the auto-lock entirely if you're running a long list and need to check measurements periodically. I always set mine to "never" on long recordings. Just remember to re-enable it before tossing the unit in your kit—nothing worse than a pocket-dialed OTDR trace.

EXFO MaxTester 730c vs. EXFO 6300: which should you buy?

I went back and forth between these two for weeks. The 730c offers more built‑in features (no external modules needed) and a bigger screen—great for field use. The 6300, on the other hand, is lighter and smaller, which matters when you're crawling into manholes. For general-purpose fiber testing, I'd take the 730c. But if you're mostly doing splice verification and basic OTDR traces, the 6300 saves you weight and money. The surprise for me: the 6300's battery life is actually better than the 730c's—by about 2 hours in my real-world tests. Neither is wrong; it depends on your daily routine.

Why does my EXFO MaxTester lose USB power when recording?

The most frustrating part of this: you think you've set up a long recording, walk away, come back an hour later, and the unit is off because the USB power dropped. What I found out after tearing my hair out: the MaxTester's USB port is designed for data sync, not continuous high‑current charging. When the device is in recording mode (especially with Wi‑Fi and Bluetooth enabled), the CPU draws more current than a standard USB 2.0 port can supply. The solution: use the dedicated charging port on the side (it's micro‑USB, not the main data port). That port delivers a steady 5 V / 2.4 A. Oh, and avoid powering through a laptop USB port—those are often limited to 0.5 A. I now carry a dedicated 2.4 A wall adapter with a 3‑foot cable in my kit, and the problem vanished.

How to perform a fast reference test with the EXFO 730c?

When you're on a rush job, the last thing you want is to spend 10 minutes navigating menus. Here's my shortcut: after powering on, press the OTDR button twice, then select "Auto Test." It'll set the wavelength, pulse width, and range automatically based on the fiber length it detects. I've used this on over 200 emergency call‑outs; it's accurate enough for 90% of faults. If you need a precise reflection measurement, you'll want to manually set the pulse to 10 ns or shorter. But for speed—Auto Test all the way.

Got another EXFO question? Drop it in the comments below. I answer every one.