Digitizer Products from Measurement Computing Corp.
Digitizer products offered by Measurement Computing Corp are also typically
referred to as: data acquisition or DAQ products. Basically a digitizer
converts analog information into a digital output. Historically the word
digitizer has been used to mean a high-speed, low-resolution device, but as
technology has advanced, it has become more and more difficult to say what is
high speed, or low resolution really means.
In data acquisition terms, a digitizer is an A/D (analog-to-digital) converter.
A 12-bit A/D converter will convert and analog input voltage into 4096 parts.
With an input range of 0 to 10 volts, an input of 8.75 volts is converted into
a digital output of [111000000000].
For typical unipolar A/D converters or digitizers, the value assigned to each
digit is predermined by design. The first most significant digit [the first
digit on the left] has an analog weight equivalent to 5 volts; the second most
significant digit has a weight of 2.5 volts; the third has a weight of 1.25
volts. Each successive digit has a weight of one-half the previous digit or
bit. Therefore, the 12th bit of a 12-bit A/D converter has a weight of 2.44
millivolts
The 12-bit A/D converter above has digitized 8.75 volts into a digital output
code of [111000000000]. To see that the code is equal to 8.75 volts, the
weights of each digit are simply added together, 5 volts + 2.5volts +1.25volts
= 8.75 volts. If the code were [111000000001], the input signal would be equal
to: 8.75244 volts.
This will allow a 12-bit A/D converter to convert any analog signal from 0 to
10 volts to a digital output where the least significant bit, the 12-bit, would
have a weight of 2.44 millivolts.
It is the combination of A/D, D/A, multiplexers, digital I/O, and other
specialty functions integrated on to a board, that interfaces with popular
personal computer bus structures, that make a data acquisition board or card.
Measurement Computing Corporation offers the largest selection of low-price PC-based data
acquisition and measurement products. Shop our online catalog by selecting a
category above. From PCI, USB, Ethernet, PC/104, ISA, and PCMCIA bus to RS-232, RS-422,
RS-485, and GPIB interfaces; Measurement Computing has everything you need for
your PC-based data acquisition and control applications.
Key Features
- 16 single-ended analog inputs
- 16-bit resolution
- Simultaneous input sampling (one A/D converter per input)
- 50 kS/s max sample rate (per channel)
- Up to 150 kS/s total module throughput
- 8 bits of DIO
- Rugged aluminum case
- Integrated screw terminals
Key Features
- 8 Single-ended inputs with 11-bit resolution
- Or 4 differential inputs with 12-bit resolution
- 50 kilosample/second sample rate
- 2 analog outputs, 16 bits of DIO
Key Features
- 8 INDEPENDENT 50KHz A/D converters, 1 per analog input
- 16-bit resolution; accuracy guaranteed to ±2.98 mV (±5V range)
- Simultaneous sampling up to 100,000 samples/sec total throughput
- 8 digital I/O bits
- External digital trigger input
Key Features
- 64 channel single-ended / 32 chan diff
- 200 kHz sample rate
- 16-bit A/D resolution
- 8192 sample gain/channel queue
- Bus-master & scatter-gather support
- Burst-Mode SS&H emulation
- 8192 sample A/D FIFO
- 100 kHz D/A update rate (16-k FIFO)
- Provides arbitrary waveform generation
- One 16-bit counter/ 32-bits, digital I/O
Digitizer-Plug-In Boards
Digitizer-USB Devices
Digitizer-Ethernet Devices
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