LRF1831C 1535 nm Laser Rangefinder | ER300 - GST inc

austarsmodel@yahoo.com (Austars Model Pty Ltd) — Fri, 06 Nov 2026 17:19:36 +0800

Detailed LRF1831C Specifications

The technical material below is retained for this model only. Do not transfer a range, pulse, interface, mechanical or safety value from another 1535 nm product.

Specifications

LRF1831C is a 1535 nm pulsed distance-measurement module. Its assigned laser source is ER300; receiver-component data below come from the supplied APD-A13B001 R01 document. The three specification levels describe different assemblies and measurement conditions.

1. LRF1831C module specifications

Source clarifications

The source J30J interface table labels two supply contacts “VCC 5V” but describes their function as “12V Input Positive”. The conflicting source labels are retained for traceability, not as wiring instructions. Use the confirmed connector record supplied with the ordered unit.

The dimension table states 113 × 76 × 90 mm and the drawing axes correspond to that envelope; the PDF has an inconsistent 125 × 100 × 70 mm caption below the drawing. The unrelated caption is not adopted as this model’s dimensions.

LRF1831C � TECHNICAL SPECIFICATIONS
Project	Performance Indicators
Model	LRF1831C
Laser Wavelength	1535 ±5 nm
Module laser-safety statement	Class I stated in the module document. Final accessible-emission classification applies to the complete configuration.
Divergence Angle	≤1.3 mrad
Laser Energy	≥350 μJ
Main Functions of the Laser Rangefinder:	a) Single-shot and continuous ranging; b) Three-target ranging with near/far target indication; c) Self-test function (including current APD temperature, high-voltage value, internal voltage, and blind-zone value); d) Standby wake-up function.
Receiver Lens Diameter	Φ60 mm
Measuring Range	a) Under line-of-sight conditions, with visibility not less than 15 km and humidity not greater than 80% (at 30 �C), the ranging distance for Target 1 (5 m × 15 m) is ≥ 6,500 m. b) Under line-of-sight conditions, with visibility not less than 15 km and humidity not greater than 80% (at 30 �C), the ranging distance for a target with diffuse reflectance not less than 30% (20 m × 20 m) is ≥ 12,000 m.
Minimum Range	≤50 m
Ranging Frequency	0.5Hz ~10Hz
Communication interface	RS422
Ranging Accuracy	±2 m
Range Resolution	≤0.1 m
Precision Rate	≥98%
False Alarm Rate	≤1%
Pin-in-lead package model	J30J
Supply Voltage	DC12 V
Standby power consumption	≤1.2W
Average power consumption	≤2 W
Peak Power Consumption	≤3W
Weight	≤410g
Dimension (L×W×H)	113×76×90mm
Operating Temperature	-40～+70 ℃
Storage Temperature	-55～+75 ℃
Impact Resistance	Meet the MIL-STD-810G testing standard
Vibration Resistance	Meet the MIL-STD-810G testing standard

LRF1831C � PIN INTERFACE
External plug-in XS3	Model：Molex51021-0500	Remark
1	TTL RX	3.3V
2	TTL TX	3.3V
3	CTRL	3.3V-5V power on, 0V power off
4	+12V	Power supply+
5	GND	Power supply-

LRF1831C � PIN INTERFACE
Pin	Definition	Function	Remarks
1	GND	Serial Port Ground
2	GND	12V Input Negative
3	GND	12V Input Negative
4	VCC 5V	12V Input Positive
5	VCC 5V	12V Input Positive
6	RS422 RX+	Serial Port Receive +	From the upper computer to the rangefinder
7	RS422 RX-	Serial Port Receive -	From the upper computer to the rangefinder
8	RS422 TX-	Serial Port Transmit -	From the rangefinder to the upper computer
9	RS422 TX+	Serial Port Transmit +	From the rangefinder to the upper computer

Model-specific mechanical and interface drawings

LRF1831C: OUTLINE DIMENSION(mm). Original model-bound drawing.

2. ER300 source-laser specifications

ER300 standalone laser component
Parameter	Value
Optical wavelength	1535 nm
Pulse energy	≥300 µJ
Optical pulse width	5 ns
Drive pulse width	≤2.4 ms
Repetition rate	1–10 Hz
Pulse stability	10% (definition/statistical method not stated)
Raw beam diameter	0.3 mm
Initial beam divergence	≤7 mrad
Transverse mode	TEM00
Operating / storage temperature	−40 to +65 �C / −55 to +75 �C
Package dimensions / mass	25 × 8 × 6.8 mm / 8.5 g
Component electrical entry	2 V, 12 A
Shock / vibration entries	1500 G, 0.5 ms / 20–2000 Hz, 20 G
Stated service life	>1 million shots; test conditions not supplied

The electrical entries describe the component drive, not the module supply input. Drive conditions and pulse-width definitions must follow the component document and the individual factory record. An optical pulse-width value is not a pump-drive duration.

3. APD-A13B001 receiver-component specifications

Small screens: swipe the table horizontally to read all measurement conditions.

Supplied APD200 document � component values and conditions
Parameter	Value	Measurement condition / scope
Device / active diameter	APD-A13B001 R01 / 200 µm	Supplied APD200 document, p1
Detector spectral response interval	800–1700 nm	Detector response; not the filter passband
Responsivity	0.9 A/W minimum; 1.0 A/W typical	λ = 1550 nm; incident power = 1 µW; M = 1
Dark current	8 nA typical; 50 nA maximum	VR = VBR − 3 V; incident power = 0
Multiplication factor	M ≥10 / M ≥30	λ = 1550 nm; 1 µW; respectively VBR − 3 V / VBR − 1 V
−3 dB bandwidth	0.6 GHz minimum; 1.25 GHz typical	M = 10; RL = 50 Ω
Breakdown voltage	35–50 V	Reverse current = 10 µA; incident power = 0
Capacitance	1.8 pF typical; 2.0 pF maximum	VR = VBR − 3 V; f = 1 MHz
Breakdown temperature coefficient	0.05 minimum / 0.11 typical / 0.15 maximum V/�C	Reverse current = 10 µA; dark; −55 to +85 �C
Operating / storage temperature	−40 to +85 �C / −55 to +125 �C	Component absolute-maximum table; not module environmental ratings
Maximum bias	VBR	Absolute maximum, not a recommended operating setpoint
Maximum forward / reverse current	5 mA / 3 mA	Absolute maximum ratings, not continuous design targets
Filter centre wavelength	1535 ±5 nm	Supplied filter table, p3
Filter FWHM	<37 nm	Full width at half maximum
Transmission at centre wavelength	>90%	Filter specification, not total receiver throughput
Blocking specification	T <1%; source lists 400–1750 nm	Stop-band/transition edges are not numerically defined; the stated blocking span is not a guarantee at every wavelength.
Optical surface quality	60/40	Source label: surface quality; not a transmission value

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