Orthonull

Those who have tried to balance low-Q components 011 a conventional bridge have experienced the frustrating sliding balance, which is the slow balance convergence resulting from the interdependence between the two balance adjustments. This phenomenon makes balances tedious when Q is less than 2 and virtually impossible when Q is less than Sliding balance occurs in any bridge that measures impedance in a nonorthog-onal coordinate system. Balances made with controls that balance inductance on one...

With Orthonull

Is that it is possible to get a bridge balance that is in error by approximately v 4Q but which is as good as lhe best possible balance. This occurs when the unknown is in the worst possible location, in the complex plane, i.e., where it is farthest from any balance point. Other, less important, limits on the accuracy are backlash, which is small, and reduced sensitivity, both of which cause errors proportional to 1 Q. Many experimental balances were made to see what sort of accuracy could be...

Increased Accuracy For The Type A And Ah Decade Voltage Dividers

Decade Voltage Divider Input Woltmeter

A new model of the Decade Voltage Divider, with an input resistance of 100,000 ohms, has been made available. In addition, the accuracy specification for these dividers has been improved by a factor of 2.5. The factors affecting the accuracy are discussed in this article. The Type 1454-A Decade Voltage Divider was introduced in 1955' with accuracy specifications of 0.1 in voltage ratio 0.000001. The intent was to take advantage of the inherently good characteristics of the Type 510 Decade...

New And Improved Version Of The Vacuumtube Bridge

General Radio 1661

Panel view of the new Type 1661-A Vacuum-Tube Bridge. The Type 501 Vacuum-Tube Bridge has for many years been the industry standard for determining to a high degree of accuracy the low-frequency coefficients of vacuum tubes. It meets the requirements of the IRE Standards on Electron Tubes' and has also proved useful for transistor measurements.2 Its ruggedness is more than adequate for many production-testing applications. The basic circuitry, devised by Dr. W. N. Tuttle,3 replaces the usual...

Fixed Capacitors

This new series of fixed air capacitors is designed and calibrated for use in three-terminal measuring systems. These standards are available in powers of 10 from 0.01 pf to 1000 pf, supplementing the Type 1409 Standard Capacitors which are offered in the range from 1000 pf to 1 juf. Since the latter are arranged for either two-terminal or three-terminal use, the total range of GR fixed, three-terminal capacitance standards is now 0.01 pf to 1 juf, a total span of 100 million to 1. Figure 1....

S

Forms are essentially rectangular, and the amplitudes are fairly constant over the entire range owing to the on-off nature of the oscillations. With a small value of coupling capacitor, the oscillations are more nearly sinusoidal and smaller in amplitude. The circuit shown, utilizing a General Radio Type 314-S86 Variable Delay Line 0 to 0.5-ptsec , oscillates readily up to about 30 Ale. The grid voltage waveforms at frequencies of 1, 5, and 20 Mc are shown in Figure 3. The upper end of the...

Specifications

Output Voltage 0-135 0-150 voltmeter . Output Current W5MT3A Two ranges 0-1, Output Watts W5MT3W Two ranges 0-150, 0-750 watts. Meter Accuracies 3 of full Scale. Switching OFF-ON, two-pole switch disconnects assembly from line in OFF position. Meter RANGE, HIGH-LOW, make-before-hreak to permit switching under load. Terminals.- Line 3-wire cord and plug. I-ioad 3-wire outlet receptacle will accept parallel 2-wire plug . Fusing W5MT3A 1 ampere, low range. 5 amperes, high range. W5MT3W 2 amperes,...

Type A Inductance Bridge

Maxwell Inductance Bridge

The instrument manufacturer who makes resistors, capacitors, and inductors of high accuracy and low residual impedance has both the need and the opportunity to build the impedance bridges required for high-accuracy measurements of these components. The General Radio Company has for many years been building, and continually improving in accuracy and stability, the Type 510 Decade-Resistance Units1 which are used in the Type 1432 Decade Resistors. The materials and winding Ivan G. Easton, The New...

Repair Services

EAST COAST General Radio Co., Service Dept., 22 Baker Avenue, West Concord, Mass. Telephone Concord, EMerson 9-4400 Lincoln, CLearwater 9-8900 NEW YORK General Radio Co., Service Dept., Broad Ave. at Linden, Ridgefield, New Jersey Telephone N. Y WOrth 4-2722 N. J., W Hitney 3-3140 MIDWEST General Radio Co., Service Dept., 6605 West North Ave., Oak Park, Illinois Telephone Village 8-9400 WEST COAST Western Instrument Co., 826 North Victory Boulevard, Burbank, Calif. Telephone Victoria 9-3013...

New Connectors For The Laboratory

PATCH CORDS, SHIELDED PLUGS, ADAPTORS, INSULATORS Connectors for interconnecting instruments are an important part of any measurement system. These connectors are properly a concern of the instrument designer, because the proper functioning of his product may depend upon the type and quality of the means used to connect it to other devices and circuits. Poor-quality terminal insulators, high-loss or noisy cables, and loose plug-and-jack combinations that make erratic contact can ruin many a...

Graphic Level Recorder With High Sensitivity And Wide Ranges

A graphic level recorder has a wide variety of uses in electronics, acoustics, and other branches of physical science and engineering. It records oil a logarithmic scale the rms magnitude of an ac voltage, rather than the instantaneous value and can plot the output of an ac device as a function either of time or of some other parameter that can be made time dependent, such as frequency. The Type 1521-A Graphic Level Recorder, an accurate and versatile instrument for recording from 20 c to 200...

Immittance Bridge

NEW FUNCTIONS, NEW NAME, AND NEW TEST MOUNTS An unusual new instrument, identified as the Type 1607-A Transfer-Function Meter, was described in this publication a little over one year ago.1 It could measure all the complex transfer functions of three- and four-terminal devices and networks, such as transistors, vacuum tubes, amplifiers, filters, and attenuators, over the 60 1 frequency range from 25 Mc to 1500 Mc. Stimulated by comments of people seeing the instrument for the first time, e.g.,...

General Radio Company

Telephone Concord fMerson 9-4400-, Boston CLearwater 9-8900 NEW YORK Broad Avenue at Linden, Ridgofield, New Jersey Telephone N. Y., WOrth 4 2722 N. J., WHitney 3-3140 CHICAGO 6605 West North Avenue, Oak Park, Illinois PHILADELPHIA 1150 York Road, Abington, Pennsylvania Telephone HAncock 4-7419 WASHINGTON 8055 13th St., Silver Spring, Maryland Telephone JUniper 5-1088 LOS ANGELES 1OOO North Seward St., Los Angeles 38, Calif. Telephone HOIIywood 9-6201 SAN FRANCISCO 1186 Los Altos Ave., Los...

Get

Plot of total number of balances required to achieve final balance, with and without Orthonull, as a function of O. j L is a component in a Cartesian coordinate system while Q is a measure of angle in a polar coordinate system, and they are consequently non-orthogonal.3 To eliminate this difficulty, the Type 1650-A Impedance Bridge is equipped with an exclusive, patented feature, known as Orthonull This name was chosen because the null is obtained by balances which are essentially...