Category Archives: Computer Support & gadget

What is a invisible IR camera?

Invisible IR cameras are typically being referred to when speaking about CCTV security cameras that use 940nm IR LEDs instead of the more traditional 850nm IR LEDs.

So, what do these numbers mean? The 940nm and 850nm reference refers to the frequency of light emitted (measured in nano-meters) by the LED lights of the camera. 940nm LEDs are invisible to the human eye. 850nm LEDs are almost invisible, except that a red glow can be seen at the location of the LED itself.

For night-time covert surveillance, this is not ideal because the red glow gives away the location of the camera. There are both indoor and outdoor camera models available on the market that use 940nm infrared.

Li-Ion battery care

Proper maintenance of your battery is critical.

Your meter uses a Li-Ion (Lithium-Ion) battery. Li-Ion batteries are light and the most powerful battery available. They have no ‘memory’ and with proper care can last a long time. Li-Ion batteries require chargers with circuitry to protect the battery from over charging or dis-charging.
Use the charger that came with your meter. The chargers have a micro-processor that matches the battery. Use of any other charger voids your warranty and may damage your battery and/or your meter.
Before you use your new meter, charge the battery until it is full. For best results, batteries should be charged at room temperature for no more than 8 hours.
DO NOT charge the battery for over 12 hours.
DO NOT over charge your battery. Over charging can damage your battery.
DO NOT leave your meter in a vehicle where the temperatures reach extreme highs or lows.
DO NOT short the battery leads.
DO NOT disassemble or deform the battery in any way.
Avoid excessive physical shock or vibration.
If you are not using your meter on a regular basis, remember to charge your battery at least 1 time per month.
If you store your meter, store it in a cool dry place with a 30% to 60% charge. It is a good idea to unplug the battery from the meter.
Never let your battery go completely dead as it may damage the circuitry in the battery and keep the battery from charging.
If you plan to air ship your meter with the battery, the battery should be charged 30% to no more than 60%. You should not air ship a fully charged battery. You are required to notify the carrier that you are shipping a Lithium Ion battery or a device containing a Lithium Ion battery.
copied from http://firststrikemeters.com/