O.n 23.8757.41 User Manual

The O.n 23.8757.41 is a precision measurement instrument designed for laboratory and industrial applications, featuring high-resolution digital display, multiple measurement modes, data logging capabilities, USB connectivity for PC interface, rechargeable battery operation, auto-calibration function, and robust construction for reliable performance. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Measurement Operation 8. Data Management 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-resolution LCD display, Measurement probe, Control panel, USB port, Battery compartment, Calibration port.

Feature	Description
Measurement probe	Precision sensor for accurate readings
USB port	For data transfer and PC connectivity
Battery compartment	Holds rechargeable lithium-ion battery
Calibration port	For external calibration equipment connection
Power input connector	For charging and AC adapter connection
Control panel buttons	Mode selection, calibration, data logging controls
POWER	Turns instrument on/off
CALIBRATE	Initiates auto-calibration sequence
MODE	Cycles through measurement modes
DATA LOG	Starts/stops data logging function

Installation

Unpack and inspect contents. Place on stable, level surface.

Install battery: Open compartment, insert rechargeable battery.
Connect measurement probe: Attach probe to designated port, secure locking mechanism.
Connect to power: Plug AC adapter into power input connector.
Initial power on: Press POWER button to verify operation.

WARNING! Instrument contains sensitive electronics; handle with care to avoid damage. Ensure all connections are secure before operation.

First-Time Setup

Power on instrument; follow initialization sequence.

Language selection: Use MODE button to select language (default: ENGLISH).
Unit configuration: Set measurement units (metric/imperial) in SETUP menu.
Auto-calibration: Press CALIBRATE to perform initial calibration.
Date/time setup: Configure system clock for accurate data logging.

CAUTION! Perform calibration in stable environmental conditions. Allow instrument to acclimate to room temperature before use.

Specifications

Display: 3.5-inch high-resolution LCD.
Measurement Range: 0-1000 units with 0.01 resolution.
Accuracy: ±0.05% of reading.
Connectivity: USB 2.0, Bluetooth optional.
Memory: 1000 data point storage capacity.
Power Source: Rechargeable lithium-ion battery (8 hours operation).
Operating Temperature: 0°C to 40°C (32°F to 104°F).
Dimensions: 200 x 150 x 50 mm (7.9 x 5.9 x 2.0 inches).

Controls and Settings

Access menu system via MENU button. Front Panel: POWER, CALIBRATE, MODE, DATA LOG, MENU, NAVIGATION arrows.

Display Indicators: Battery level, measurement mode, calibration status, data logging active.

Measurement Modes: CONTINUOUS, SINGLE, AVERAGE, PEAK HOLD. Settings: Display contrast, backlight timeout, auto-off timer, measurement units, date/time format. Calibration: Auto-calibration, manual calibration, calibration history.

Connecting Devices

USB: For data transfer and software updates. External probe: Additional measurement sensors.

Turn off instrument before connecting devices.
Connect USB cable to computer and instrument port.
Install companion software on PC for data management.
Select USB mode in instrument menu (DATA TRANSFER or CHARGE ONLY).

Tip: Use certified USB cables only. Ensure proper driver installation on PC.

Measurement Operation

Supports multiple measurement modes for various applications.

Select mode: Press MODE to cycle through available measurement modes.
Position probe: Place measurement probe on target surface or in medium.
Initiate measurement: Press and hold MEASURE button for continuous reading.
Record data: Press DATA LOG to store current measurement.
Review data: Use NAVIGATION arrows to scroll through stored measurements.
Calibration check: Perform calibration verification every 24 hours of operation.
Data export: Connect via USB to transfer logged data to PC.

WARNING! Do not exceed specified measurement ranges. Keep probe clean and free from debris.

Data Management

Data Logging: Store up to 1000 measurements with timestamp. Data Export: USB transfer to PC software. Data Clear: Option to erase all stored measurements.

Care & Maintenance

Power off before cleaning. Use soft, dry cloth for display and housing. Clean probe with approved cleaning solution only.

CAUTION! Do not immerse instrument in liquids. Avoid abrasive cleaners. Store in protective case when not in use.

Regulatory Information

FCC Part 15: Class A digital device; complies with interference limits for commercial use. CE marked for European compliance. RoHS compliant. Copyright © 2025 O.n Instruments; all rights reserved. For technical support, visit www.on-instruments.com or contact 1-800-555-0234.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No display	Battery/connection	Charge battery; check power connections; ensure POWER button pressed.
Inaccurate readings	Calibration/probe	Perform calibration; clean probe; check for damage.
USB not recognized	Cable/drivers	Use certified cable; install proper drivers; check USB mode setting.
Data logging error	Memory full	Clear stored data; export existing data to PC.
Probe not responding	Connection/damage	Check probe connection; inspect for physical damage; replace if necessary.

Reset: Menu > System > Factory Reset (erases all data and settings).

Service: 1-800-555-0234; www.on-instruments.com/support