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Electronic Test Equipment

Electronic test equipment is the heart of the electronics industry, the bleeding edge of electronic innovation and quality. No manufacturer demonstrates that better than Hewlett-Packard, whose test equipment is generally considered the benchmark of engineering quality, a standard which has never been met by another company.

Analogic Panel Meter Module
 Analogic Panel Meter Module

No mere decoder circuit, this compact module is an entire voltmeter. 3.5 digit B5750 display, TTL drivers.

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Hewlett-Packard 1640A Serial Data Analyzer
 Hewlett-Packard 1640A Serial Data Analyzer

The 1640A Serial Data Analyzer is a specialized computer, designed to be inserted inline between two serial devices, where it can be used to display and monitor the data being transmitted across the serial line. The unit can also transmit serial data, and has limited simulation functions that allow it to send and record data in response to strings of characters sent down the serial line by other devices.

1640A Datasheet (PDF)

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Hewlett-Packard 4955A Protocol Analyzer
 Hewlett-Packard 4955A Protocol Analyzer

The Hewlett-Packard 4955A is an obscure cousin of the HP 9825 desktop calculator, a minicomputer-class system used extensively in scientific and engineering fields. Instead of being built for arithmetic and programming, the 4955A is optimized for network analysis. The 4955A is based on the HP 5061-3011 16-bit hybrid microprocessor, equivalent to an enhanced HP 2100-series minicomputer on three NMOS dies.

4955A Datasheet (PDF)
Protocol Analyzer Comparison Sheet (PDF)

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Fluke 887AB Differential Voltmeter
 Fluke 887AB Differential Voltmeter

The Fluke 887AB AC/DC differential voltmeter functions like a comparator. Instead of displaying the voltage of the object being tested, the user selects a voltage on the large numeric and the meter tells the user how close it is to the actual voltage of the tested device. Though unwieldly, the 887AB can measure voltage increments as small as 0.01mV. This is far more precise than most of its contemporaries, perhaps making it worth dealing with the comparator-style operation.

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Heathkit 10-12 Oscilloscope
 Heathkit 10-12 Oscilloscope

The Heathkit 10-12 is a single-trace vacuum tube oscilloscope. The 10-12 has horizontal and vertical inputs on the front panel, as well as a place to connect an external trigger. The 10-12 also has a z-axis input, though it is well concealed. The user must unscrew a small metal hatch from the back of the unit to gain access to the z-axis connector. All connecters are the banana plug style common on older scopes, instead of more modern BNC connectors. The screen diameter is an ample five inches, and rotary knobs are used for all front panel operations. The horizontal frequency scale has two user presets, which can be set by inserting a screwdriver into a pair of holes on the right of the timebase control.

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Hewlett-Packard 130C Oscilloscope
 Hewlett-Packard 130C Oscilloscope

The 130C is a single-trace vacuum tube oscilloscope with identical X and Y circuits for true XY performance. The 130C contains 17 tubes, not counting the CRT and a half dozen neon glow lamps. Among the tubes are two RCA 7586 Nuvistor triodes and a host of specially aged, high performance Amperex and Telefunken diodes, triodes and pentodes.

Unfortunately, 130C has been called "the last good scope HP ever made". Despite HP's total dominance in every other kind of test equipment, their line of oscilloscopes has not shown such a flawless track record. Most oscilloscopes manufactured by HP from the mid-1960s through the mid-1980s have been inferior at best, leaving room for Tektronix and other manufacturers.

130C Oscilloscope Operating & Service Manual (PDF)
130C Oscilloscope Calibration Procedure (PDF)

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Hewlett-Packard 410B Vacuum Tube Voltmeter
 Hewlett-Packard 410B Vacuum Tube Voltmeter

The Hewlett-Packard 410B has been called the Caddilac of vacuum tube voltmeters, and is universally hailed as the finest ever made.

410B Operating & Servicing Manual (PDF)

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Hewlett-Packard 8010A Pulse Generator
 Hewlett-Packard 8010A Pulse Generator

Serial Number 0994G00384.

8010A Pulse Generator 1970 Catalog Excerpt (PDF)

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Hewlett-Packard 8016A Word Generator
 Hewlett-Packard 8016A Word Generator

Serial number 1903G00811. Unit has been fully tested and works perfectly. Includes HP-IB interface (Option 001). This unit was originally owned by NCR; last calibrated 6/1990.

8016A Datasheet (PDF)
8016A Operating and Service Manual (PDF)

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Hewlett-Packard 43114A Digital Delay Generator
 Hewlett-Packard 43114A Digital Delay Generator

According to the available documentation, the Hewlett-Packard 43114A digital delay generator does not exist. Like most HP equipment, the unit is built to survive a land war in Asia. A machined aluminum frame and a complex tongue-and-groove enclosure protect the internals. The primary point of interface is a five-digit BCD encoder, which is used to set the amount of delay applied to the source signal in units of microseconds. At its maximum setting, the unit can delay a signal by 99,999 microseconds. The unit also has a knob to set the threshold for triggering; a value between zero and 90 volts can be selected. There are two outputs: a TTL output located on the front panel, and a +90V output on the rear of the unit. An interior inspection reveals that most of the internals of the device are powered by generic TTL chips.

Unfortunately, the output of the 43114A is highly specialized. The unit does offset the input by the amount of delay selected on the BCD switch, but it does not preserve the data of the input. All of the output pulses are of the same length, regardless of the input signal, which makes it near useless for offsetting most serial signals. RZ (return to zero) signals could probably still be offset, though it would depend heavily on the width of the RZ pulses required by the destination device. This 43114A also has a more serious failing. With a +5V logic signal as the input, the maximium speed the device can handle before it no longer triggers accurately is 20Hz. Whatever the original purpose of this device, it was highly specialized.

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Serfass RCM 15B1 Conductivity Bridge
 Serfass RCM 15B1 Conductivity Bridge

The Serfass RCM 15B1 conductivity bridge functions as a comparator. The component to be tested is attached to the device, and the user manipulates the controls to match the internal configuration of the device to that of the tested component. The eye tube provides visual feedback to this process: as the device is brought closer to matching the value of the tested component, the illuminated wedge on the tube becomes narrower. When the wedge of light in the eye tube is at its minimum width, the comparator has been successfully tuned to the component and the component's value can be read from the state of the controls. Comparators of are little use to the modern electronics engineer, as modern equipment can provide much faster and more accurate measurements.

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Supreme 546 Oscilloscope
 Supreme 546 Oscilloscope

The Supreme 546 is a military-issue vacuum tube oscilloscope built in the 1930s and 1940s. The 546 is notable for its 3" display, three times the diamater of many scopes from the same era. Internally, the 546 is exactly what one would expect from a piece of equipment of this age. The underside is a mass of tar and wax paper capacitors; topside there is nothing but tubes.

Supreme 546 Wiring Diagram (PDF)

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