DBK46 4-Channel Analog Output Card
Daq
Overview
Overview ...... 1
Hardware Setup ...... 3
Software Setup ...... 3
For use with: DaqBook/2000A
DaqBook/2000E
DaqBook/2000X
DBK46 – Specifications ......4
Reference Notes:
o Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to your
system, as needed.
o The P3 connector’s DAC related pins [31, 32, 33, and 34] apply to the DaqBook/2000 Series
Device only when a DBK46 is installed. For WBK41, DAC related connections are made via
a front panel screw terminal block.
The DBK46 is a factory-installed option currently available for DaqBook/2000A, DaqBook/2000E,
DaqBook/2000X, and WBK41. JP1 plugs into a 40-pin header on the primary acquisition device.
Analog DAC Output is then available, as follows:
•
For DaqBook/2000 Series devices, from the device’s P3 connector.
•
For WBK41, from a front panel terminal block.
WBK41
The 37-pin P3 connector is
on the DaqBook/2000
Internal Acquisition Pacer Clock
External Acquisition Pacer Clock
Pin 20 on P1; Pin B26 on P4
Internal DAC Pacer Clock
External DAC Pacer Clock
Pin 21 on P3; Pin A26 on P4
Series device front panel.
DBK46 Block Diagram,
Book/2000 Series Applications
DBK Option Cards and Modules 967194 DBK46, pg. 1
WBK41 Front Panel,
Right-Edge Terminal Block
Internal DAC Pacer Clock
Internal Acquisition Pacer Clock
External DAC Pacer Clock (DPCR)
DBK46 Block Diagram,
WBK41 Application
The DBK46 has a 256K sample buffer that can be used for one to four DACs. If only one DAC is enabled
for waveform output, then the entire 256K sample memory can be used to store a waveform for that DAC.
If two DACs are enabled for waveform output, then 128K of sample memory is available for each of the
two DACs. Use of all four DACs drops the available memory down to 64K per DAC.
Software loads the waveform(s) into all, or a portion of, the 256K sample buffer. The waveform data
drives the DACs at the rate of the specified DAC Pacer Clock. The waveforms will repeat until the DACs
are disabled by software.
The DBK46 provides an output range of -10V to +10V. The card’s 256 Kbyte of sample buffer memory
can store waveforms from the PC.
When used to generate waveforms for a
DaqBook/2000 Series device, each DAC can be independently
clocked in one of four modes. These are:
Internal DAC Pacer Clock - The on-board programmable clock can generate updates ranging
•
from 1.5 Hz to 100 kHz, independent of any acquisition rate.
•
Internal Acquisition Pacer Clock - Using the on-board programmable clock, the analog
output rate of update can be synchronized to the acquisition rate derived from 100 kHz to once
every 5.96 hours.
•
External DAC Pacer Clock - A user-supplied external input clock can be used to pace the
DAC, entirely independent of other analog inputs.
•
External Acquisition Pacer Clock - A user-supplied external input clock can simultaneously
pace the DAC and the analog input.
When used to generate waveforms in a
WBK41, the DACs can be clocked in one of three modes.
These are:
Internal DAC Pacer Clock - The WBK41 programmable clock can generate updates ranging
•
from 1.5 Hz to 100 kHz, independent of any acquisition rate.
DBK46, pg. 2
• • Internal Acquisition Pacer Clock – By using the WBK41 programmable clock, the analog
output rate of update can be synchronized to the acquisition rate derived from 100 kHz to once
every 5.96 hours.
External DAC Pacer Clock (DPCR) - A user-supplied external input clock can be used to
pace the DAC, entirely independent of other analog inputs. This external clock input connects
to the DPCR connector, located on the Counter/Timer Terminal Block.
967194 DBK Option Cards and Modules
Hardware Setup
DBK46 is installed at the factory. To verify that a DBK46 is installed, simply check the acquisition
software’s Analog Output Window for the presence of DAC0, DAC1, DAC2, and DAC3.
Software Setup
DBK46 does not require setup in software.
Reference Notes:
o DaqView Users: In regard to the out-of-the-box software and analog output channels, refer to the
DaqView and DaqViewXL Document Module, especially the following two sections: Analog Output
Window, and Waveform and Digital Pattern Output Window.
o WaveView Users: In regard to the out-of-the-box software, refer to the WaveView Document
Module.
o PDF versions of the documents are included on the data acquisition CD and can be accessed via the
<View PDFs> button, which is located on the CD’s intro-screen.
DBK Option Cards and Modules 967194 DBK46, pg. 3
DBK46 – Specifications
The four analog output channels are updated synchronously relative to scanned inputs, and are clocked
from either an internal clock on the primary acquisition device, such as a DaqBook/2000A; or from a usersupplied external clock source. Analog outputs can also be updated asynchronously, independent of any
other scanning in the system.
Channels: 4
Resolution: 16 bits
Data Buffer: 256 K sample FIFO
Output Voltage Range: ±10V
Output Current: ±10 mA
Offset Error: ±0.0045V max
Gain Error: ±0.01%
Update Rate: 100 kHz max, 1.5 Hz min (no minimum with external clock)
Settling Time: 10 µsec max to 1 LSB for full-scale step
Digital Feed-thru: a spike of up to 50 mV may occur on the DAC output
each time the DAC output is updated
Clock Sources: 4 programmable clock sources:
•
The primary acquisition device’s onboard D/A input clock, independent of the scanning input clock
•
The primary acquisition device’s onboard scanning input clock
An external D/A input clock, independent of an external scanning input clock
•
An external scanning input clock
•
Note: Specifications are subject to change without notice.
DBK46, pg. 4
967194 DBK Option Cards and Modules
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