Flashdelay Unit Simplifies Motion Analysis In Highspeed Machines

For many years the Strobotac electronic stroboscope has been a valuable tool in the development and maintenance of all kinds of rotating and recip rocating equipment. Two accessories greatly expand the usefulness of this stroboscope in the study of high-speed motion, the new Type 1531-P2 Flash Delay and the Type 1536-A Photoelectric Pickoff.1 'I'sinii a Photocell Where it Counts, General Radio Experimenter, 36, 10, October, 1962. Figure 1. The Flash Delay and Photoelectric Pickoff in...

New Sound And Vibration Analyzer

The Type 15G4-A Sound and Vibration Analyzer is designed primarily for the frequency analysis of acoustic spectra having components in the frequency range between 2.5 c-ps and 25 kc. It incorporates many important improve- 1 J. J. Faran, Jr A Now Analyzer for Sound and Vibration, General Radio Experimenter, 33, 12, December, 1959. ments over its predecessor, the Type 1554-A,1 which make it more useful and easier to operate. Two band widths are provided, each a fixed percentage of the frequency...

Standard Sweepingfrequency Signal Generator

The General Radio Company has for many years manufactured standard-sig-nal generators, the word standard denoting that certain characteristics (usually the frequency, amplitude, and modulation) of the output signal provided are accurately indicated, or standardized. With the introduction of the Type 1025-A Standard Sweep-Frequency Generator, the standard concept has been extended to the sweeping-frequency signal generator. to be as universally applicable as possible, but is particularly useful...

With Fivedigit Accuracy

The new Type 1151-A Digital Time and Frequency Meter is a more sophisticated brother of the Type 1 lnO-A Digital Frequency Meter previously announced.1 It does not replace the Type 1150-A, but it does extend the range of precision frequency measurement to low frequencies, where a simple counting frequency meter is inefficient. Low frequencies are determined rapidly and accurately by measurement of their periods or decimal multiples of the period. Measurement of higher frequencies is...

Instrumentation In Israel

The First International Electronics, Nucleonics, Control and Scientific Instrumentation Exhibit in Israel was held at Tel Aviv, November 7 through 16, 1962. Some 5000 representatives of science, engineering, and industry in Israel came to see the latest equipment displayed by 10 manufacturers, including General Radio, whose booth is shown in the photographs below. (Left) Mr. R. Danziger of Eastronics, Ltd., General Radio representatives in Israel, demonstrates GR instruments to Mr. I. Ben...

Preci

The recent introduction of the Type 900-BT Precision Coaxial Connector1 2 marks the beginning of a new era in coaxial precision measurement. Prior to the development of this connector, precise impedance-measuring instruments and standards were not commercially A. E. Sanderson, A Radically New Coaxial Connector, General Radio Experimenter, 37, 2 & 3, February-March, 1963. 2 A. P. Lagon, A New Precision Coaxial Connector (Type 900), NBS Report, No. 7277, June 29, 1962, pp 54-82. available for...

Oscillators

The General Radio high-frequency oscillators have found widespread use as simple signal sources. They cover a very wide frequency range, and, with accessory equipment, which includes rhodulators, mechanical sweeps, attenuators, coaxial fittings, and a variety of power supplies, they can be assembled into more sophisticated systems to meet specific needs. Some of these possibilities are indicated in figure 2. To enhance further the adaptability and convenience of these oscillators, a redesign of...

Description

Figure 2 is a simplified schematic of the Type 1806-A Electronic Voltmeter. The instrument is basically a high-quality dc amplifier, which is used directly for dc voltage measurements. There is included, for measurement of ac voltage, a diode probe, which rectifies the ac signal and whose output is measured by the same dc amplifier. The dc amplifier is also used in ohmmeter operation to measure the voltage drop across the unknown resistor in a voltage-divider-type ohmmeter. The dc amplifier is...

Output Stage

Functional block diagram of the Flash Delay. Figure 4. The action of cam followers can be easily examined with the Strobotac-Flash Delay combination. These photographs show the bounce of a cam follower at high speeds. The cam is rotating counterclockwise. Figure 4. The action of cam followers can be easily examined with the Strobotac-Flash Delay combination. These photographs show the bounce of a cam follower at high speeds. The cam is rotating counterclockwise. low-power devices such...

New Reference Standard

Hermetically Sealed Containers

A new capacitor has been designed to obtain a standard in which capacitance changes remain small compared to 20 ppm without the use of unusual care in handling, in environmental control, or in measurement. This is the new Type 1404 Reference Standard Capacitor, a three-terminal, sealed, dry-nitrogen-di-eleetric capacitor with direct capacitance of 1000 pf or 100 pf. Stability in this capacitor has been obtained not by unusual design but by the use of a simple, solid, homogeneous structure of a...

Vibration Meter With Metric Calibration

To meet the requirements of those who prefer to use the metric system, the Type 1553 Vibration Meter1 can now be supplied with a metric calibration. The Type 1553-A Vibration Meter which is calibrated in mils displacement, in sec velocity, in sec2 acceleration, and in sec3 jerk, is still available. A new model, the Type 1553-AK is direct reading in mm displacement, m sec velocity, m sec2 acceleration, and m sec3 jerk. Both instruments will be supplied with the new Type 1560-P52 PZT Ceramic...

Specifications

Characteristic Impedance 50.0 ohms 0.1 . Probe Travel 50 cm. Scale calibrated in centimeters from the reference plane. Attached vernier scale can be read to 0.1 mm. Scale Accuracy 0.1 mm 0.05 . Frequency Range 300 Mc to 9 Gc. At 300 Mc, covers a half wavelength. Operates below 300 Mc with Type 900 Precision Air Line. Constancy of Probe Pickup 0.5 . Residual VSWR Less than 1.001 0.001 X foe e.g., 1.002 at 1 Gc . Accessories Supplied Type 874-R22A Patch 900-LB I Precision Slotted Line Cord Type...

New Cleveland Office

September 1 marks the official opening of our 12th Sales-Engineering Office, in Cleveland. Manager of the new office will be L. C. Tom Fricke BSEE, U. of Illinois, '57 , who for the past few years has been at our Chicago Office. He will be assisted by Danny Woodward BSEE, U. of Illinois, '62 , who goes to Cleveland after an intensive training course at Concord. Customers in Ohio, Kentucky, and western Pennsylvania will find this new office a convenient source of technical and commercial...

Toronto

Oetlinger was recently appointed Service Supervisor at General Radio's Service Laboratory in Toronto. Located adjacent to the General Radio Canadian Office at 99 Floral Parkway, Toronto 15, Ontario, the laboratory provides complete repair and calibration facilities, as well as a stock of replacement parts, for GR products. Mr. Oetlinger, formerly Supervisor, Electronic Laboratory, Bayly Engineering Ltd., Ajax, Ontario, has had over ten years' experience in this field, and is well...

Slip Clutch

3 A standard capacitor is used to measure the driving current of the reciprocal transducer.9 4 The necessary calculations are performed by a simple dial-type analog computer coupled to the switch see Figure 3 . The voltages that result from the acoustical transfers are duplicated with an electrical network that includes a logarithmic potentiometer. The angular positions of the potentiometer shaft are proportional to the logarithms of the voltages to be measured, and these shaft positions are...

The Strobolume

One of the major problems of modern cloud physics is the description of the growth of precipitation particles raindrops, graupels and hailstones . Theoretical computations show that the gas-phase contributes negligibly to the growth of the mass, as long as the growing particles show diameters of more than 2 mm. The determining factor for the growth of precipitation particles is, therefore, the accretion, the capture of cloud particles, either water droplets or ice particles with diameters from...

Info

We look forward with pleasure to welcoming Experimenter readers to the General Radio exhibit at Weseon. Many new instruments will be on display. Several of these have been described in recent issues of the Experimenter. Others are shown for the first time and will be described in forthcoming issues. new narrow-band analyzer, 20 to 50,000 cps, with 3 bund widths 3, 10, and 50 cps. Type 1 564-A Sound and Vibration Analyzer - 2.5 to 25,000 cps, 1 3- and 1 10-octave bands, all-solid-state...

The Aeronautical Instruments Laboratory

Old Aircraft Instrument

To a pilot, it is a matter of some importance that the fuel gage in his aircraft be accurate. The degree of accuracy required and the various types of fuels used by modern aircraft led to the demise of the float-type gage and to the development of a fuel-quantity gage that operates by sensing the electrical capacitance of the fuel-tank probes. This parameter is directly proportional to mass, which in turn is closely related to the energy content of the fuel. To check the accuracy of such a...

Reference Standard Capacitor

The transfer of the high accuracy of measurements at the National Bureau of Standards to other laboratories requires standards of correspondingly high stability. For example, XBS now calibrates capacitance standards of 1000 pf at 1000 eps with an accuracy better than 0.002 or 20 ppm parts per million . But, whenever a capacitor calibrated at NBS is moved to another laboratory, the uncertainty of the calibration is increased by the possible changes in capacitance when the capacitor is...