HT-Instruments Multi LED Lux Meter HT309 User Manual

1. Introduction

The HT309 is a digital light meter designed for precise measurement of illuminance. It utilizes a silicon photodiode sensor to measure light levels up to 400,000 Lux. This device is specifically capable of measuring illuminance from LED sources of various colors by applying relevant correction factors, and it can also measure luminous intensity, expressed in Candela.

This manual provides comprehensive instructions for the safe and effective use, setup, operation, and maintenance of your HT-Instruments HT309 Lux Meter.

2. Safety Information

Please read all safety warnings and instructions carefully before operating the device to prevent injury or damage. Keep this manual for future reference.

• Do not expose the device to extreme temperatures, humidity, or direct sunlight.
• Avoid dropping or subjecting the device to strong impacts.
• Do not attempt to open or modify the device. Refer all servicing to qualified personnel.
• Ensure batteries are inserted correctly according to polarity markings.
• Remove batteries if the device will not be used for an extended period to prevent leakage.
• Keep the sensor clean and free from obstructions for accurate readings.

3. Package Contents

Verify that all items listed below are included in your package:

• HT309 Multi LED Lux Meter Unit
• Carry Case
• Batteries (Product Specific, included)
• User Manual (this document)

4. Product Overview

Familiarize yourself with the components of your HT309 Lux Meter:

Figure 4.1: The HT-Instruments HT309 Multi LED Lux Meter. The main unit features a digital display and control buttons, connected by a cable to the external silicon photodiode sensor. The sensor is shown with its protective cap removed, revealing the light-sensitive dome.

Main Unit: Contains the display, control buttons, and processing circuitry.

• Display: Shows illuminance readings (Lux/FC), light source settings, battery status, and other indicators.
• Power Button: Turns the device on/off.
• HLD (Hold) Button: Freezes the current reading on the display.
• LUX/FC CD Button: Toggles between Lux, Foot-Candle (FC), and Candela (CD) measurement units.
• MAX/MIN Button: Displays the maximum or minimum recorded reading.
• MEM/READ Button: For memory functions (if applicable, refer to advanced features section).
• SRC (Source) Button: Selects the light source type for LED correction factors.
• ZRO (Zero) Button: Calibrates the sensor to zero in dark conditions.
• Arrow Buttons: For navigation and adjusting settings.

External Sensor: A silicon photodiode sensor connected via a cable, designed to accurately measure light intensity.

• Photodiode Sensor: The light-sensitive component.
• Protective Cap: Covers the sensor when not in use to prevent damage and ensure accurate zeroing.

5. Setup

5.1 Battery Installation

The HT309 requires product-specific batteries, which are included. Locate the battery compartment on the rear of the main unit. Open the compartment cover, insert the batteries according to the polarity markings (+/-), and close the cover securely.

5.2 Initial Power On

Press the Power button to turn on the device. The display will illuminate and perform a self-test. Ensure the sensor's protective cap is removed before taking measurements.

6. Operating Instructions

6.1 Basic Illuminance Measurement (Lux/FC)

1. Turn on the device using the Power button.
2. Ensure the sensor's protective cap is removed.
3. Place the sensor at the location where you wish to measure illuminance. Ensure the sensor is facing the light source directly.
4. The current illuminance reading will be displayed in Lux.
5. To switch to Foot-Candle (FC) units, press the LUX/FC CD button. Press again to cycle back to Lux or Candela.

6.2 Measuring LED Light Sources

The HT309 can measure illuminance from various LED light sources by applying correction factors.

1. With the device on, press the SRC button.
2. Use the Arrow buttons to select the appropriate LED light source type (e.g., red, blue, white LED). Refer to the device's display for available options.
3. Once the correct source is selected, the meter will apply the necessary correction factor for accurate measurement.

6.3 Measuring Luminous Intensity (Candela)

To measure luminous intensity, the device requires specific setup and distance from the light source. Refer to advanced measurement techniques for detailed instructions on Candela measurement.

1. Press the LUX/FC CD button until "CD" is displayed as the unit.
2. Follow specific instructions in the full manual (if available) regarding distance and light source characteristics for accurate Candela readings.

6.4 Using Hold, Max/Min, and Zero Functions

• HLD (Hold): Press this button to freeze the current reading on the display. Press again to release.
• MAX/MIN: Press to display the maximum reading recorded since the device was turned on or reset. Press again to display the minimum reading. Press a third time to return to live measurement.
• ZRO (Zero): In a completely dark environment (e.g., with the sensor cap on), press this button to zero the sensor, ensuring accurate low-light measurements.

7. Maintenance

7.1 Cleaning

Wipe the device and sensor with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure the sensor surface is clean and free of dust or smudges for accurate readings.

7.2 Storage

When not in use, store the HT309 in its carry case in a cool, dry place, away from direct sunlight and extreme temperatures. Always place the protective cap on the sensor before storage.

7.3 Battery Replacement

When the low battery indicator appears on the display, replace the batteries promptly to ensure continued accurate operation. Refer to section 5.1 for battery installation instructions.

8. Troubleshooting

If the problem persists after attempting these solutions, please contact customer support.

9. Specifications

10. Warranty and Support

10.1 Manufacturer Warranty

This product comes with a 1-year manufacturer warranty. Please retain your proof of purchase for warranty claims. The warranty covers defects in materials and workmanship under normal use.

10.2 Customer Support

For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact HT-Instruments customer support. Refer to the product packaging or the manufacturer's official website for the most current contact information.