Non-Linear Systems, Inc. NLS X-3 Multifunction Instrument
March 1968 Radio-Electronics

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.

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.