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Text excerpt from page 28 (click to view)
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Standard -hp- instrziments shown here are adaptable f o r making nearly every electronic measurement in the electronic field. Following is a brief description of a few of these instrzcments. Complete technical information will be sent- without obligation -on request. In addition, -hp- engineers are at your service to help solve special problems.
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V A C U U M TUBE VOLTMETER
-hp- Model 400A Vacuum Tube Voltmeter sets a new standard of performance for voltaKe measurements in the audio. supersonic. and lower radio frequency region. Measurements u p to I megacycle with this instrument are as simple as measurements with the usual multi-range meter a t d-c. Nine ranges give full-scale Sensitivities from .030 to 300 volta. Ordinarily no p r e cautions whatsoever are required: turn-over effect and waveform errors are minimized; there are no adjustments to make during operation: a large overload will not damage the instrument. The input impedance is I megohm so that most circuits will not be disturbed when their voltage is measured.
WIDE-BAND AMPLIFIER
- h p 450A Amplifier is a new. vrrsatile. wide-band
amplifier designed f o r general laboratory or production use. I t provides exceptional stability a t 40 o r 20 d b gain. and gives new freedom from spurious responses. Low phase shift is assured by a straight-forward. resistance-coupled amplifier design. together with inverse feed back. Frequency response is flat within z d b ,' between 10 and 1.oOO.OOO cps. Varying tube voltages o r aging tubes have no appreciable effect o n the gain or other characteristics. When used in conjunction with -hp- 400A Vacuum Tube Voltmeter. it increases voltmeter scnnitiviiy 100 times.
A U D I O S I G N A L GENERATORS
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H-F V A C U U M TUBE VOLTMETER
combines in one instrument a n ac voltmeter covering frequencies from 20 cps to 700 mc. a dc voltmeter with 100 megohms input impedance. and a n ohmeter capable of nieasuring resistances from .2 ohms to 500 megohms. The special probe places a capacity of 1.3 uufd across the circuit under test. Input resistance for ac measuremerts is 6 megohms. Six voltage ranges provide fullscale sensitivities from I to 300 volts.
-hpy Audio Signal Generators are designed for timesaving performance. They are excellent f o r laboratory applications because they supply a voltage as well as a known frequency a t the commonly used impedance levels. They are particularly suitable for gain measurements because no auxiliary apparatus is re uired. They provide an excellent source of voltage for listortion measurements because their waveform distortion i very small. s
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-hp- 410A High Frequency Vacuum Tube Voltmeter
H A R M O N I C W A V E ANALYZER
-hp- Model 300A Harmonic Wave Analyzer is a n excel'
DISTORTION ANALYZER
This Model 3308 Distortion Analyzer IS -hp'n nmest. finest distortion measuring instrument. I t is c a p ble o f mrasurinp distortton a t any frequency between 20 cps and 2O.OOO cps. It will make n o m measurements of voltages as .mall a s 100 microvolts. A linear r-f detector makes i t possible to measure these characteristics directly from a modulated r-f carrier. T h e hi h senaitivit stable accuracy and compactness of tffe 330B m a l e i t extremely valuable for broadcast. Iaboratory and productton measurements.
RESISTANCE-TUNED A U D I O OSCILLATORS
-hp- Resistance-Tuned Oscillators are suitable for almost every type of work. Their low distortion makes them particularly valuable in making distortion measurements on audio amplifiers. broadcast transmitters and other equipment. They rovide an excellent aource of volta e for accurate brilge measurements. The output is sutfcient to drive signal generators and other e q u i p ment requiring considerable power. Their wide frequency range also makes them suitable for work in the supersonic region.
vidual components of a complex wave IS required. The maximum selectivity i s sufficient for measurement o f harmonics of frequencies as low as 30 c d e s and i t can be varied over a wide range. With t l i s variable selectivity feature. measurements a t hisher frequencies can be made more rapidly. yet with no sacrifice In accuracy.
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lent instrument for both rapid measurement work where accurate and laboratory and production indiof
