NT381 Series — Optical Power Meter & VFL

Product Overview

The NT381 series OPM and OPM&VFL products use single-chip microprocessor control with complete functions, and an embedded detector and laser for protection. The instrument has ten standard wavelengths including 1270 nm and 1577 nm, plus frequency recognition, wavelength recognition, automatic shutdown, CW/1 Hz/2 Hz red-light modes, backlight display, wavelength memory, user calibration and lighting; it also supports RJ45 cable sequence and cable tracking test, with a wide test range and high accuracy. It is mainly used for continuous optical signal power measurement, fibre link loss test and fibre line on-off test, and is widely used in cable construction and maintenance, fibre communication, fibre sensing and optical CATV.

Product Features

Supports CW / 1 Hz / 2 Hz three modes
Ten-wave power measurement
Recognises CW/270/330 Hz/1 k/2 kHz modulated optical signals
Wavelength recognition and wavelength memory
Backlight display and automatic shutdown
High-definition broken-code screen
LED / VFL / RJ45 sequence / length integration
Type-C interface with power-bank charging
RJ45 cable sequence (standard) and cable tracking (optional)
Portable and robust

Technical Specification

Ordering code NT381-A-B-C-D — A: OPM range (5: −50 to +30 dBm, 7: −70 to +10 dBm); B: VFL (0: none, 1: 1 mW red light); C: cable tracker (0: none, 1: fitted); D: battery (D: dry, L: lithium).

Optical power meter

Wave range	850/980/1270/1300/1310/1490/1550/1577/1625/1650 nm
Power range	−70 to +10 dBm / −50 to +30 dBm
Identified frequency	CW / 270 Hz / 330 Hz / 1 k / 2 kHz
Display resolution	Linear 0.1 % · logarithmic 0.01 dBm
Connector	Universal FC/SC/ST

Visual fault locator (optional)

Wavelength	650 nm ± 20 nm
Output power	1 mW
Mode	CW / 1 Hz / 2 Hz
Laser safety class	Class II

General

RJ45 test	Cable sequence (standard) and tracking (optional), ≤ 300 m
Power supply	2 × AAA batteries or 3.7 V 700 mAh lithium (optional)
Automatic shutdown	10 / 30 / 60 min
Battery duration	≥ 120 h (OPM)
Operating temperature	−10 °C to +50 °C
Storage temperature	−40 °C to +70 °C
Relative humidity	0 – 95 % non-condensing
Size	127 × 78 × 30 mm
Weight	About 200 g

Standard Configuration

Host, user's manual, qualification certificate / service guarantee card, AAA batteries or lithium battery, line finder, sling.

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