Key Digital ES381 Bedienungsanleitung PDF herunterladen (Seite 5)

1 OVERVIEW

The USBcount50 is an isolated digital pulse counter that has the

following features:

• Single channel pulse counter with BNC input and USB PC

interface

• Each USBcount50 can be stacked to increase channel count (each

requires its own USB connection)

• 300V Cat II isolation between BNC ground and USB ground

This means that there is no DC path through the USBcount50

from the counters input to the PC’s ground

• Up to 50MHz input counting, 100MHz with suitable input signal

• 10ns timing resolution

• Single shot or continuous update

• 28-bit counter gives 268 million : 1 dynamic range

• Two modes of operation: Frequency mode or Period mode

• Frequency mode can use 0.1s, 1s or 10s integration times. Large

dynamic range of counter means 1s integration setting can be

used from 1KHz up to 100MHz i.e. no auto-ranging required

• Period mode can use internal 1MHz, 10MHz or 100MHz

reference clocks coupled with edge detection logic for

rising→rising, falling→falling, falling→rising, rising→falling.

Large dynamic range of counter means 100MHz clock setting can

be used from 10us up to 26.8s i.e. no auto-ranging required

• Period mode (aka reciprocal counting mode) is able to measure

frequencies down to below 4mHz.

• Programmable input stage voltage level from 1.5V to 5.0V in 256

steps

• Input protected to 30V DC

• Host powered from USB (200mA typ)

• Stacked configurations of 2,3 and 4 channels are supported

• Power/activity LED

A stacking connector kit is required

In stacked configurations the channels share a common ground at the BNC terminals

Elan Digital Systems Ltd. 5 USBcount50 USER’S GUIDE Iss1

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Key Digital ES381 Bedienungsanleitung Seite 5