Checkpoint LAB USB-RS232 Bedienungsanleitung PDF herunterladen (Seite 7)

RFID –

RADIO FREQUENCY IDENTIFICATION

Wireless Short Range Locator

How it works: RF unit transmits to listening

devices (RFIDs) within its range. Once within

range, this listening device will chirp back its ID.

Popular frequencies: 13 MHz, 2.4 Ghz. FCC

compliant: < 80dBuA @ 13 MHz; 4W @ 2.4 GHz.

Uses: In pets, people, cards, badges, cloths,

marathon runner shoe, UPS tracking, voter ID.

Readily available and inexpensive. SOC makes

it reasonably simple.

STRAIN GAUGE, LOAD CELLS

As the gauge bends or flexes,

resistance changes. That simple!

Output voltage range is typically in

millivolts. Supply voltage is typically in

Vcc range. Good linear response.

Metallic – shown to the right. Range

from 30 to 3000 Ω.

Wheatstone bridge circuit may be

used for better precision and

calibration.

Semiconductor – more reliable, more

predictable

Piezoresistive – alternative.

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Checkpoint LAB USB-RS232 Bedienungsanleitung Seite 7