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March 1968 Radio-Electronics
 [Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Electronics,
published 1930-1988. All copyrights hereby acknowledged.
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The Non-Linear Systems,
Inc. (NLS) X-3 Multipurpose Digital Voltmeter is a rugged, early solid-state DMM
from the mid-to-late 20th century, developed by NLS - founded by Andrew Kay,
inventor of the digital voltmeter. Known for high precision and a Nixie tube or
LED display, it measured DC/AC voltage, resistance, and sometimes current, with
a high input impedance (1 MΩ+) to minimize circuit interference. Designed for
industrial and lab use, it was among the first digital meters to replace analog
counterparts, reflecting NLS's role in pioneering digital instrumentation. Some
models saw military/aerospace applications, underscoring their reliability.
Though obsolete, the X-3 remains collectible, especially among vintage
electronics enthusiasts, with functional units prized for their retro appeal.
NLS's legacy extends beyond test equipment - Kay later founded Kaypro, a key
early PC manufacturer.
Non-Linear Systems, Inc. NLS X-3 Multipurpose Digital Voltmeter
 Solid State Multipurpose Digital Voltmeter
with VTVM Capabilities
Value Through Innovation
Features:
DC Volts: 10 Microvolts to 10,000 volts @ 100 Meg Ω Input Impedance
AC Volts: 10 Millivolts to 300 Volts 20 Hz to 500 MHz
Ohms: 10 Milliohms to 2000 Megohms
Current: 10 Pico amps to 200 Milliamps
Accuracy: .1 % ±1 digit
100% Over-range
3 Readings per second most ranges
Floating Input
Unique Low, Medium, High Range Selector
Overload Indicator
Analog Output
Auxiliary Power Supply Output
Dual Ohms Protection
Automatic Polarity
Polarity Indication
Display Storage
Optional Adjustable 30 volts, 150 ma regulated plug-in supply
$695 (including probes)
Originator of the Digital Voltmeter
Non-Linear Systems, Inc.
Del Mar, California 92014
[714] 755-1134/TWX: 910-322-1132
The NLS X-3 is the first digitally indicating multifunction instrument designed
to fill those requirements where .005 % and .01 % accuracies are not required. The
X-3 eliminates the operator training required by inaccurate, difficult-to-read moving
pointer meter displays.
Parallax is completely eliminated; the unique Hi-Lo-Medium range switch makes
the X-3 a pleasure to use; especially in production line testing.
All the features in the X-3 are standard, including the probes. A unique and
long awaited innovation in the X-3 is PS-1 Power Supply Option. The Standard X-3
provides a filtered 40 volt, 200 ma power supply. When the PS-1 is used, it directly
plugs into the front panel terminals on the X-3. Now, besides having the measuring
capabilities provided by the X-3, you have an adjustable, regulated 0-30 volt, 150
milliampere supply. By simply turning a switch on the supply, you can monitor both
supply voltage and supply current and still use all the measuring capability of
the X-3.
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