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Overcoming Single-Channel D/A Limitations

Control applications often require multiple analog outputs. Dedicating a separate D/A converter for each output line can become expensive, especially when having to buy multiple cards. The PD-SCXU-AOMUX takes the signal from one analog output line on a standard I/O card and, with the aid of sample/holds and programmable-gain amplifiers, expands the number of outputs to eight.

The control logic on this multiplexer outboard accepts trigger signals from a digital output line on the data-acquisition card, thus allowing you to run all eight multiplexed channels at an aggregate speed equal to the peak update rate of the analog output. So, you can control the unit from virtually any standard I/O card that supplies one analog output and seven digital outputs.

It is supplied with configured cables and connectors. The number of analog outputs on a conventional I/O plug can be extended to 128 channels by daisy chaining eight boards on one cable. You also can set the range for each of the eight channels and set the lines for standard current output (0 to 20 mA or 4 to 20 mA). Voltage outputs include 0 to 5 V, 5 V, 0 to 10 V, and ý10 V with current capabilities of 35 mA per channel with short-circuit protection.

The output accuracy for voltage and current outputs is ý0.05% of span. Gain error is 0.002%, offset calibrated to 1 mV. Onboard DC/DC or an 18- to 32-V external source can supply loop power for current outputs. The unit measures 8.25ý ý 6.8ý ý 1.97ý and its operating range is 0 to 70ý C.

The PD-SCXU-AOMUX costs $695.

United Electronic Industries, Inc.
(617) 924-1155
Fax: (617) 924-1441
www.ueidaq.com

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