A/D converters for CTA systems

A/D converters for CTA systems
Acquisition of output voltages from CTA anemometers
Applications
Features
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Data acquisition from MiniCTA
Data acquisition from Multichannel CTA
Data acquisition from StreamLine
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Sampling frequencies up to 250 kS/s
Simultaneous sampling of 8 channels at 250kS/s
Up to 16 input channels
Complete solutions including A/D board, connector
box and flat cable.
Combinations of CTA anemometers and A/D boards.
Introduction
A/D boards and accessories
Acquisition of data from CTA anemometers requires an
A/D converter board either in a PCI slot, or connected to
a USB port.
Dantec Dynamics offers complete solutions consisting of
selected A/D boards, connector box and cables. The
recommended boards cover most CTA applications with
respect to number of channels, resolution and sampling
frequency.
Dantec Dynamics offers a number of A/D converters for
use with desktop and laptop PC’s. The PCI boards have
consecutive sampling rates up to 250 kS/s or
simultaneous sampling up to 250 kS/s. This covers most
subsonic CTA applications in gases. A USB board
samples 4 to 16 channels simultaneously at 100 kS/s.
The input resolution is 12 or 16-bit, which is sufficient for
even fine scale turbulence measurements.
As the accuracy of a hotwire measurement depends on
the measured voltage, correct grounding precautions of
the AD converter must be performed, avoiding ground
loops. Dantec Dynamics ensures the accuracy and
stability of the CTA system through system tests before
delivery. This applies for AD boards supported by the
application software, and delivered by Dantec Dynamics.
The PCI boards in combination with the connector box
have inputs for external triggering and an output
handshake signal. This allows the data acquisition to be
started by an external event. The handshake signal,
which defines the acquisition status, can be used to
determine when it is safe to move a traverse system not
controlled by the CTA application software.
A/D Converters for CTA systems
Product information
Ordering information and technical specifications
Dantec
order no.
Description
Analog
1
inputs
Sample rate
Resolution
(bits)
Input
ranges
(Volts)
Digital
output
Ext. trigger
38A0261
USB A/D Unit with
BNC connectors
4 DI
100 kS/s
simultaneous
16
±10
None
None
91N262
USB A/D Unit with
BNC connectors
8 DI
100 kS/s
simultaneous
16
±10
None
None
91N263
USB A/D Unit with
BNC connectors
12 DI
100 kS/s
simultaneous
16
±10
None
None
91N264
USB A/D Unit with
BNC connectors
16 DI
100 kS/s
simultaneous
16
±10
None
None
38A0262
PCI A/D Converter
16 SE
1 channel: 250 kS/s
16 channels: 15 kS/s
16
±10
None
2
None
38A0263
PCI A/D Converter
8 DI
250 kS/s
simultaneous
16
±5
2
Digital
38A0265
BNC Connector
Box
8 DI
2
Digital trigger input
38A0266
Flat Cable, 2m
2
1
DI: Differential Input, SE: Single Ended
Trigger input and digital outputs are not available, when the Multichannel CTA is connected to the A/D board input with the
shielded cable directly. Trigger input and digital outputs are accessible if the Connector box is used.
2
Recommended combinations of CTA anemometers and A/D converter
CTA system
Desktop PC
Laptop PC
Configuration
MiniCTA or 4 Ch
Multichannel CTA
38A0261
38A0261
Max. 4 channels
6 Ch or 8Ch
Multichannel CTA
38A0262 + 38A0266
91N262
Max. 8 channels
2x 6Ch or 2x 8Ch
Multichannel CTA
38A0262 + 38A0266 +
9054N0891
91N264
Max. 16 channels
StreamLine
38A0263 + 38A0265+ 38A0266
One of the above according to
the number of channels
Max. 16 channels
Max. 6 ch/frame
Note that the above combinations of anemometers and A/D converters are recommendations in order to match anemometer
bandwidths and board sampling rates. Other combinations are possible; please contact your local representative for advice.
Additional information
For additional information and ordering please contact
your Dantec Dynamics representative. Dantec Dynamics
undertakes a continuous and intensive product
development programme to ensure that its instruments
perform to the highest technical standards. As a result
the specifications in this document are subject to change
without notice.
Publication No.: PI120v13
www.dantecdynamics.com

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