Key Digital ES381 사용자 설명서
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
This means that there is no DC path through the USBcount50
from the counters input to the PC’s ground
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
• 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
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
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
• Host powered from USB (200mA typ)
• Stacked configurations of 2,3 and 4 channels are supported
• Power/activity LED
1
A stacking connector kit is required
2
In stacked configurations the channels share a common ground at the BNC terminals
Elan Digital Systems Ltd.
5
USBcount50 USER’S GUIDE Iss1