A Portable , Low - Gost , High - Performance
نویسنده
چکیده
New design and manufacturing approaches reduce this DMM's costlperformance ratia and allow it to be calibrated electronically. Low-Cost and Portability Gome to Data Acquisition/Gontrol Products, by JamesJ. Ress-meyer You can take this inexpensive, battery-powered instrument into the f ield to monitor f low rates, wind velocities, bridge sfresses, soil temperatures, or whatever. Data Acquisition and Control Software for the 3421A Using the HP-85 Computer, by David F. Leonard lhrs system provides easy-fo-use data logging capability at low cost. Low-Cost Instrument Control: A New ROM for the HP41 Handheld Computers, by David L. Wolpert Now HP-41 users can control instruments to measure and anaNze a variety of physical parameters on the bench or in the field. Electronic Mail for the Interactive Office, by lan J. Fuller Ihis sysfem lets you exchange messages by computer within your organization, even if you're not a pragrammer. fntegrated Tools lmprove Programmer Productivity, by Anil K. Shenoy and Carolyn M. Bircher HP 3000 programmers can nolv access several program developmenf fools as if they were a single subsystem. In this Issue: Last month's issue featured the Hewlett-Packard Interface Loop, HP's new two-wire serial interconnection system lor low-cost battery-powered devices. In this month's issue you'llfind articles on the first two HP instruments designed to operate on the HP-lL. Model 3468A, the subject of the article on page 3, is a digital multimeter, a basic instrument that measures voltage, current, and electrical resistance. Besides its HP-lL connection, the 3468A is interesting for its production process. The subassemblies that go into it aren't tested and adjusted individually before they're put together. Naturally, this lowers the production cost quite a lot, but by conventional manufacturing wisdom it's risky to the point of foolhardiness. To make the risk acceptable, new approaches were taken in both the design and the rnanufacturing processes. Currently more than 80o/o of the 3468As pass the acceptance tests when they're first turned on at the end of the production line. The long-term goal is 96%. The other new HP-lL instrument is the 3421A Data Acquisition/Control Unit, pictured on this month's cover and described in the article on page 10. With the 3 421Aand an HP-41 Handheld Computer, you can have a portable system that will scan up to 30 channels, make a measurement on each one, and analyze the data for you. You can also set up the 3421A to actuate valves or relays to control the …
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