Standard -hp- instrziments shown here are adaptable for
making nearly every electronic measurement in the electronic
field. Following is a brief description of a few of these instrzc- .
1
ments. Complete technical information will be sent- without
obligation - on request. In addition, -hp- engineers are
at your service to help solve special problems.
VACUUM 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 re-
gion. Measurements up to I megacycle with this instru-
ment are as simple as measurements with the usual
multi-range meter at d-c. Nine ranges give full-scale
Sensitivities from .030 to 300 volta. Ordinarily no pre
cautions whatsoever are required: turn-over effect and
waveform errors are minimized; there are no adjust-
ments 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
I when their voltage is measured.
WIDE-BAND AMPLIFIER
-hp 450A Amplifier is a new. vrrsatile. wide-band
amplifier designed for general laboratory or production
use. It provides exceptional stability at 40 or 20 db
gain. and gives new freedom from spurious responses.
Low phase shift is assured by a straight-forward. re-
sistance-coupled amplifier design. together with inverse
feed back. Frequency response is flat within ',z db
between 10 and 1.oOO.OOO cps. Varying tube voltages or
aging tubes have no appreciable effect on the gain or
other characteristics. When used in conjunction with
-hp- 400A Vacuum Tube Voltmeter. it increases volt-
meter scnnitiviiy 100 times.
AUDIO SIGNAL GENERATORS
i -hpy Audio Signal Generators are designed for time-
H-F VACUUM TUBE VOLTMETER saving performance. They are excellent for
laboratory applications because they supply a r:",":=I
-hp- 410A High Frequency Vacuum Tube Voltmeter voltage as well as a known frequency at the commonly
combines in one instrument an ac voltmeter covering used impedance levels. They are particularly suitable
frequencies from 20 cps to 700 mc. a dc voltmeter with for gain measurements because no auxiliary apparatus
100 megohms input impedance. and an ohmeter capable is re uired. They provide an excellent source of voltage
of nieasuring resistances from .2 ohms to 500 megohms. for listortion measurements because their waveform
The special probe places a capacity of 1.3 uufd across distortion is very small.
the circuit under test. Input resistance for ac measure-
merts is 6 megohms. Six voltage ranges provide full-
scale sensitivities from I to 300 volts.
HARMONIC WAVE ANALYZER DISTORTION ANALYZER
-hp- Model 300A Harmonic Wave Analyzer is an excel- This Model 3308 Distortion Analyzer IS -hp'n nm-
lent instrument for both laboratory and production
' RESISTANCE-TUNED AUDIO est. finest distortion measuring instrument. It is cap-
work where accurate and rapid measurement of indi- ble of mrasurinp distortton at any frequency between
OSCILLATORS vidual components of a complex wave IS required. 20 cps and 2O.OOO cps. It will make nom measurements
The maximum selectivity is sufficient for measurement of voltages as .mall as 100 microvolts. A linear r-f
-hp- Resistance-Tuned Oscillators are suitable for al- of harmonics of frequencies as low as 30 c des and it detector makes it possible to measure these character-
most every type of work. Their low distortion makes can be varied over a wide range. With tlis variable istics directly from a modulated r-f carrier. The hi h
them particularly valuable in making distortion measure- selectivity feature. measurements at hisher frequencies senaitivit . stable accuracy and compactness of tffe
ments on audio amplifiers. broadcast transmitters and can be made more rapidly. yet with no sacrifice In 330B male it extremely valuable for broadcast. Iabora-
other equipment. They rovide an excellent aource of accuracy. tory and productton measurements.
volta e for accurate brilge measurements. The output
is sutfcient to drive signal generators and other equip _I r, ---- x ..
a
ment requiring considerable power. Their wide fre-
quency range also makes them suitable for work in the
supersonic region. |
ACEC
