
The general-purpose OPM/VFL for installation and maintenance teams
The NT371 series OPM and VFL all-in-one is controlled by a single-chip microprocessor with complete functions. An embedded detector and laser give good protection. It offers ten st…
The NT371 series OPM and VFL all-in-one is controlled by a single-chip microprocessor with complete functions. An embedded detector and laser give good protection. It offers ten standard wavelengths including 1270 nm and 1577 nm, frequency identification, automatic shutdown, CW/1 Hz/2 Hz red-light modes, wavelength memory, user calibration and RJ45 cable sequence and tracking test. It is mainly used for continuous and modulated optical signal power measurement, fibre link loss test and line on-off test, in cable construction, fibre communication, fibre sensing and optical CATV.
| Wave range | 800 – 1700 nm |
|---|---|
| Standard wavelengths | 850/980/1270/1300/1310/1490/1550/1577/1625/1650 nm |
| Power range | −70 to +6 dBm / −50 to +26 dBm |
| Connector | Universal FC/SC/ST |
| Identified frequency | CW / 270 Hz / 330 Hz / 1 k / 2 kHz |
| Display resolution | Linear 0.1 % · logarithmic 0.01 dBm |
| Wavelength | 650 nm ± 20 nm |
|---|---|
| Output power | 1 mW |
| Mode | CW / 1 Hz / 2 Hz |
| Laser safety class | Class II |
| RJ45 test | Cable sequence and tracking, ≤ 300 m |
|---|---|
| Interface | USB Type-C |
| Operating temperature | −10 °C to +50 °C |
| Weight | About 120 g / 130 g |
Host, lithium battery, Type-C data cable, user's manual, qualification certificate / service guarantee card, sling.

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