HER-408 - Luxmeter Steren - Free user manual and instructions
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| Brand | Steren |
| Model | HER-408 |
| Product Type | Luxmeter (Digital Illuminance Meter) |
| Measurement Range | 0 – 50,000 Lux |
| Resolution | 1 Lux |
| Accuracy | ±5% of reading |
| Sampling Rate | 2 times per second |
| Display | LCD, 3½ digits |
| Power Supply | 9V battery (6F22 type) |
| Battery Life | Approx. 200 hours |
| Dimensions (L x W x H) | 150 x 70 x 30 mm |
| Weight | 200 g (including battery) |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -10°C to 50°C |
| Data Hold Function | Yes |
| Low Battery Indication | Yes |
| Auto Power Off | After 15 minutes of inactivity |
| Sensor Type | Silicon photodiode |
| Accessories Included | Carrying case, 9V battery, user manual |
| Certifications | CE, RoHS |
| Warranty | 1 year |
Frequently Asked Questions - HER-408 Steren
How do I measure illuminance with the Steren HER-408?
Point the light sensor (white dome) directly at the light source. Press the POWER button to turn on the meter. The reading in lux will appear on the LCD. Avoid blocking the sensor or casting shadows.
How do I replace the battery?
Turn off the meter and remove the battery compartment cover on the back. Replace the old 9V battery with a new one, ensuring correct polarity. Close the cover securely. The low battery indicator appears when replacement is needed.
What is the measurement range of the HER-408?
The meter measures illuminance from 0 to 50,000 Lux with a resolution of 1 Lux. For very bright sources, use the range button if available (not specified for this model).
What does the 'Data Hold' button do?
Press the DATA HOLD button to freeze the current reading on the display. Press again to release. This is useful for recording measurements in hard-to-read positions.
What does the low battery indicator mean?
A battery icon or 'BAT' on the LCD means the battery voltage is low. Replace the battery promptly to avoid inaccurate readings.
Can the HER-408 measure foot-candles?
No, this meter displays values in Lux only. To convert to foot-candles, divide the lux reading by 10.764.
How should I clean and maintain the light sensor?
Gently wipe the sensor dome with a soft, dry cloth. Avoid solvents or abrasives. Keep the sensor clean for accurate measurements.
Why is my reading fluctuating or unstable?
Fluctuations can be caused by flickering light sources (e.g., fluorescent or LED), shadows, or movement. For stable readings, use the Data Hold function or average multiple readings.
Does the meter have auto power off?
Yes, the meter automatically turns off after 15 minutes of inactivity to conserve battery. Press the POWER button to restart.
What accessories are included with the HER-408?
The package includes the meter, a 9V battery, a carrying case, and the user manual. Additional accessories may be available separately.
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USER MANUAL HER-408 Steren
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Product information
Brand : Steren
Model : HER-408
Category : Luxmeter