Specifications

For limits of 0.10 For limits of 0.05 For limits of 0 .04 For limits of 0 .03 For limits of 0 .02 For limits of 0 .01 1500- 3000 kc 1500- 6000 kc 1500- 7500 kc 1700-10,000 kc 2500-15,000 kc 5000-30,000 kc The absolute accuracy is 0.003 when using Type 376-M Quartz Plate. The frequency stability is 0.001 over long periods of time. Quartz Plate Type 376-M Quartz Plates are to be used with this instrument and must be ordered separately. Accuracy of Frequency Discriminating Network When operated at...

Practical Application Of Symmetrical Feed To Condenser

Change-over from the usual end-feed system to a center-feed system lowers both the metallic resistance and residual inductance by a factor of 4. In practice, it is seldom advantageous to go further than this because the resistance and inductance of the leads to the binding posts quickly become predominant. In the Type 722-N Precision Condenser center-feed has been adopted with a consequent reduction of resistance and inductance in the stack. In addition a heavy strip connector is used to feed...

Cycle Measurements

Intended for industrial use, the new Type 740-B Capacitance Test Bridge was of necessity designed for 60-cycle operation. To the cable, transformer, and electrolytic condenser manufacturer 1000-cycle measurements have been of little value, since much of the equipment manufactured in these industries is intended for low-frequency operation. Neither of the UNKNOWN terminals is actually connected to ground, although at balance the 1owt terminal of the bridge is effectively at ground potential....

The Amplifier And Null Indicator

The problems involved in obtaining a satisfactory visual null indicator are considerably more exacting than those in obtaining a suitable acoustical indicator. For the acoustical method of balance, the ear can tolerate the presence of considerable harmonic distortion and extraneous electrical noise without materially reducing the accuracy to which the balance can be obtained. In this bridge, an electron-ray tube (the so-called magic eye) is used as a detector. W ith this type of visual...

A V C Characteristic

The wide range of voltage measurement is also an advantage in AVC measurements. A typical inexpensive receiver may have an AVC ratio of 20 1 for an input range of 1000 1, and it may overload at voice coil inputs above one This article is based in part upon data suppl the liadio Receiver Engineering Department, gratefully acknowledged. watt. With a 3-olim voice coil resistance, the AVC measurement must be taken at an output level belowr the overload point of 1.73 volts. If the volume control is...

Frequency In Megacycles

Direct Reading Impedance Bridge

Left Resistance characteristic of the east antenna at WEEI. Right Reactance quencv, both resistive and reactive components looking into the east antenna changing about 1 U when the west antenna was opened and grounded at the base. All measurements on one antenna and its feeding system were made with the other antenna connected back through its feeding system to the transmitter. To determine the characteristic impedance of the concentric lines, the system is broken at B B and C C....