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Used for Test and Measurement/Automation Systems +5, +10, +/-5, +/-10V output ranges 4-20mA current loop capability 12-bit Resolution Voltage Source The DAC-02 is ideal for controlling setpoints. It provides two independent double-buffered, 12-bit multiplying D/A channels plus interface circuitry. The D/A converters can be used with a fixed DC reference as conventional D/A. Onboard references of –5V and –10V provide output ranges of 0–5V, 0–10V, ±5V, ±10V and 4–20mA for process control current loops. Alternatively, the D/A may be operated with a variable or AC reference signal as multiplying D/A; where the output is the product of reference and digital inputs. With an AC reference, the unipolar outputs provide 2-quadrant multiplication and the bipolar outputs provide 4-quadrant operation. Twelve-bit accuracy is maintained up to 1kHz. Since data is represented in 12 bits, it is written to each D/A in 2 consecutive bytes. The first byte contains the 4 least significant bits of data. The second byte contains the most significant 8 bits of data. The least signifi- cant byte is written first and is stored in an intermediate register in the D/A (having no effect on the output). When the most significant byte is written, its data is combined with the stored least significant data and presented to the D/A converter, thus assuring a single-step update. This process is known as double buffering. The DAC-02 is a 5-inch-long half-slot board suitable for use in IBM PC/XT/AT and all compatibles. The DAC-02 is addressed as an I/O device using eight I/O locations and may have its I/O address set to any 8-bit boundary in the 255–1023 (decimal) I/O address space. The board uses the internal +5V, +12V, and –12V computer supplies. (New keithley dac-02 2-ch 12-bit analog output board was posted and is owned by: Angel Lynn) |
alynn@chicagopartsnetwork.com (Angel Lynn) for more information.
