New Link Unit For The Graphic Level Recorder

The Type 1521-A Graphic Level Recorder with the new Type 1521 -P14 Link Unit is shown driving (below) the Type 1304-B Beat-Frequency Audio Generator and (right) the Type 1554-A Sound and Vibration Analyzer. A new Link Unit, Type 1521-P14, is now available to couple the Type 1521-A Graphic Level Recorder to the Type 1304-B Beat-Frequency Audio Generator or to the Type 1551-A Sound and Vibration Analyzer for the automatic recording of frequency response char acteristics. With this link unit, the...

New Pzt Ceramic Vibration Pickup And Control Box For Vibration Measurements

A new lead-zirconate-titanate acceler-ometer replaces the barium-titanate ceramic accelerometer as the general-purpose vibration pickup supplied with the General Radio Company's vibration-measuring instruments. This new transducer increases the upper frequency limit of the Type 1553-A1 Vibration Meter from 1200 cps to 2000 cps. A newly designed control box provides a like increase in the frequency response plus an increase in over-all measuring sensitivity when the pickup is used with a Type...

Rosecolored Glasses For White Noise

Slope upward with increasing frequency. The bandwidth of the analyzer increases in direct proportion to the frequency to which the analyzer is tuned. Since noise voltage increases as the square root of the bandwidth, it can be seen that the voltage output of the generator increases by a factor of 1.4 3 db when the analyzer frequency is doubled, thus giving the amplitude-frequency characteristic a slope of 3 db per octave. If the random-noise generator is used as a source for a system .under...

Experimental Results Of Four Methods Of Using Vlf Transmissions

Deterrent to any attempts to claim greater accuracy of calibration. The various possible methods of frequency comparison using vlf transmissions have been described by J. A. Pierce.1 The methods used by the present author were either taken directly from this publication, or derived from it indirectly. Several methods have been tried, with the results indicated below. In order to use vlf transmissions for frequency-standard calibration, it is necessary to make use of the phase of the carrier...

Decade Capacitor

Following the successful introduction of the Type 1424-A Standard Polystyrene Decade Capacitor in June 1961,1 it appeared that many users of a 10-microfarad-total decade might not need its sophisticated performance specifications. Accordingly, another version of this decade capacitor, the Type 1424-M, is being introduced, having less rigorous performance specifications and being appreciably lower in price. It is made from twenty -microfarad sealed foil- 'P. K. McElroy, A New 10-Microfarad...

Test Oscillator For Sband Measurements

With the Type 1360-A Microwave Oscillator, the frequency range of General Radio continuously tunable oscillators is extended to 4 Gc. Although not itself one of the Unit Instruments, it supplements this popular line of test equipment that provides the user with versatility and quality at a reasonable price. Every effort has been made to give this new oscillator, within the design limitations dictated by tube choice and price, maximum usefulness as a driver for slotted lines, as the local...

The Type A Adjustable Ac Power Source

The Type 1633-A Incremental-Inductance Bridge requires relatively large amounts of alternating and direct-current power and the bridge and power sources must tolerate alternating and direct currents, simultaneously. The Type 1266-A Adjustable AC Power Source has been designed to meet these specific requirements. Six voltage ranges and five current ranges are selected by rotary panel switches, mechanically interlocked to interdict any combination that might exceed the 200-volt,ampere capacity of...

Operates Directly From Piezoelectric Microphone

General Radio 1560

An octave-band analysis has become the most widely used method of determining the frequency distribution of acoustical noise, because it yields, with minimum effort, sufficient information to solve most noise problems. Most octave-band filter sets are fairly cumbersome and operate from the output of a sound-level meter, which serves as an acoustic pickup and high-impedance preamplifier. In field applications this arrangement is often inconvenient, owing to the necessity of handling two...

The Type C An Improved Unit Oscillator

View of the Type 1211-C Unit Oscillator. Figure 1. View of the Type 1211-C Unit Oscillator. The Type 1211 Unit Oscillator,1 0.5 to O Me, which was first, announced in September, 19-53, has now been modified as a first step in a program of Unit-Oscillator redesign which should make t hese popular rf power sources even more useful in the future. The characteristic I -shaped mounting panel of the Unit Oscillators and their open construction, which give excellent shielding and heat...

General Radio Company

Telephone Concord EMerson 9-4400 Boston Mission 6-7400 Area Code Number 617 Broad Avenue at Linden, Ridgefield, New Jersey Telephone N. Y., WOrth 4-2722 N. J., WHitney 3-3140 Pickard Building, East Molloy Road, Syracuse 11, N. Y. 6605 West North Avenue, Oak Park, Illinois 1150 York Road, Abington, Pennsylvania Telephone Philo., HAncock 4-74 19 Abington, TUrner 7-8486 8055 13th St., Silver Spring, Maryland 113 East Colonial Drive, Orlando, Florida 1000 North Seward St., Los Angeles 38, Calif....

Capacitance Bridge Transformer

Transformer Ratio Arm Bridge

Capacitance Bridge Audio Oscillator Coaxial Cable Connectors 1962 EIME Schedule Capacitance Bridge Audio Oscillator Coaxial Cable Connectors 1962 EIME Schedule The General Radio EXPERIMENTER is mailed w it h ou t charge each month to engineers, scientists, technicians, and others interested in electronic techniques in measurement. W hen sending requests for subscriptions and address-change notices, please supply the following information name, company address, type of business company is...

New Variac Autotransformer With Builtin Voltmeter

This new variac autotransformer consists of a Type W5 variac Autotransformer and a voltmeter, mounted in a metal case, finished in hammertone gray, with switch, cord, plug, and convenient carrying handle. Line cord and output receptacle are 3-wire types. A double-pole on-off switch disconnects both sides of the input-line. The load circuit is protected by a circuit breaker. Input Volts 120. Frequency 50 to 00 cps. No-Load Loss 9 watts. Output Volts 0 to 140. Maximum Load Current 5 amperes....

High Performance Lowcost Audio Oscillator With Solidstate Circuitry

Modern solid-state circuitry is used in the new Type 1311-A Audio Oscillator to produce a self-contained, compact, inexpensive instrument with many desirable features. Among these are high-power output into a wide range of load impedances, low-distortion even when the load impedance is short-circuited, excellent stability, low noise, and very small size. The Type 1311-A Audio Oscillator supplies power at eleven commonly used Figure 1. Panel View of the Type 1311-A Audio Oscillator. Figure 1....

The Type A Capacitance Bridge

The new Type 1615-A Capacitance Bridge is a transformer-ratio bridge of the type that uses a single decade of transformer voltage division and multiple, fixed, standard capacitors to provide six decades of resolution in capacitance. As shown in the elementary diagram of Figure 4, one side of the secondary of the ratio transformer is tapped at intervals of one-tenth, and to these taps can be connected six standard capacitors in any combination required to balance the bridge. If, for example, the...

More Talents New Dress For The Output Power Meter

In the nearly thirty years since its first announcement, the General Radio Type 583-A Output Power Meter has served as a work-horse of the audiofrequency industry. During this time, significant advances in material and techniques have made possible its replacement by a new instrument, based on the same general theory, but improved in all respects. Both instruments are basically multi-tapped audio-frequency transformers that, by transformation ratio, reflect an essentially fixed secondary load...

A Fivedigit Solidstate Counter For Frequency Measurements To kc

The Type 1150-A Digital Frequency Meter is the first of a line of inexpensive, basic counters for laboratory and industrial applications. Like the Type 1130-A Digital Time and Frequency Meter announced a year ago, it is accurate, reliable and easy to operate. Unlike the Type 1130-A, which has memory circuits and a neon-tube columnar readout, the Type 1150-A uses transistors instead of tubes and an in-line readout with alternate counting and display periods. The counting circuits used are...

New Wire Power Cord

The Type CAP-22 Power Cord 3-wire is now supplied with all General Radio instruments that use a detachable power cord, replacing the Type CAP-15 formerly supplied. This new design has a hammerhead connector at its power-line end, with both male and female connectors, thus permitting two or more cords to be attached in parallel. Two No. 18 conductors are used. The covering is rubber, and the connector bodies are molded integrally with the cord. This power cord is also available separately, as...

Coaxial Equipment With Lockingtype Connectors

General Radio 874 Lk20l

Can be plugged directly into the other. Electrically, the voltage-standing-wave ratio is essentially unchanged from the low value that is characteristic of Type 874 Connectors. Typical figures for a pair of locking connectors are lt 1.02 up to 3 Gc and lt 1.06 up to 7 Gc. The shielding qualities of the locking connector produce an outstanding gain for measurement systems. Leakage is down approximately 50 db below that of the non-locking type. Coaxial instruments now equipped with locking-type...

More And Better Pulses From The Unit Pulse Generator

Type Pulse Generator

The Type 1217-A Unit Pulser1 was, like its companion instruments in the unit line, designed for maximum utility, minimum complexity, and low cost. The thousands of these compact, high performance devices that are now in use have shown that the design was indeed iR. W. Frank, Pulses in a Small Package A Pulse Cienerator for the lnit Line, General Radio Experimenter, 28, 10, March, 1954. a successful blend of these often conflicting factors. Time has made available new circuits and components,...