NEW PRODUCTS
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Research accelerator, Activatron 211M, is a variation of the Activatron 211 neutron generator. In addition to producing 14 m.e.v. neutrons at a rate of 2.5 χ 10 11 per second, the 211M produces 15 m.e.v. protons at a rate of 5 χ 108 per second. Heavy gases may be ac celerated to energies of 200 k.e.v. Beam currents of 2.0 ma. have been obtained for He, N, 0, Ne, and Ar. The Activatron 211M consists of an accelerator unit, associated high volt age power supplies, and a desk-type control console. Technical Measure ment Corp., 441 Washington Ave., North Haven, Conn. 06473. 413
Surface Area Measurements The Area-meter is based on the standard B E T method. An adsorption vessel with the sample and a compari son vessel are filled with nitrogen. The vessels are brought to the temperature of liquid nitrogen. The pressure differ ence resulting from the adsorbed nitro gen is measured on a differential ma nometer filled with oil. The surface area is calculated from the BET theory without empirical calibration coeffi cients, using a single-point evaluation. Measuring range is 0.3 to 1000 m. 2 /gram. Error of individual adsorption measurements is less than ± 1 % . Com mercial nitrogen may be used. Up to 16 samples can be measured in an 8hour day. Dimensions are 8 inches wide, 10 inches deep, and 32 inches high. Strohlein & Co., Postfach 7829, Adersstrasse 91-94, 4 Diisseldorf 1, Germany. 414
Mass Spectrometer Model MS10-C-2 is a console mass spectrometer based on an analyzer with a resolution up to mass 400 and a pow erful electromagnet. The magnetic field can be set at any value up to 9k gauss and can be swept at six speeds (from 100 to 3000 seconds for a full scan). A reverse scan is also pro vided. Picker X-Ray Corp., White Plains, Ν. Υ. 415
POTENTIOMETRIC ELECTROMETER
measures dc voltages with source resistances up to 1010 ohms simply... and to 0.01% With 0 . 0 1 % limit of error per year, the Keithley 630 measures dc from 300 millivolts to 500 volts from source resistances as high as 1010 ohms! No other commercially available instru ment offers anything like its minimum off-null input resistance of 10' 3 ohms. Because of its ultra-high input resistance the instrument draws an absolute minimum of current—avoids load ing and polarizing the source. Here's an instrument that combines a poten tiometer, a voltage reference and a guarded vibrating-reed null detector into a single pack age. Itfreesyou from tedious multiple instrument connections. It saves the time lost in fighting ground-loop and pick-up problems. And—it's also a 3% accurate vibrating-reed electrometer. The 630 fills the need for precision dc mea surements from high resistance sources in electrochemical and materials research. It lends itself especially to measuring potentials from piezo-electric crystals, electrochemical cells, organic semi-conductors, biological cells and pH electrodes. Other typical applications in clude making Hall Effect and fuel-cell studies, silicon and capacitor charge measurements and for measuring FET gate potentials. Write today for technical engineering note giving complete Model 630 details. OTHER KEITHLEY ELECTROMETERS Model Model Model Model Model
610B —complete dc laboratory 610BR —rack mounted 610B 621 —37 ranges, li ne operated 600A — 54 ranges, battery operated 603 —50 kc bandwidth amplifier
$565 $585 $390 $395 $850
POTENTIOMETRIC ELECTROMETER • ± 0 . 0 1 % accuracy or 30 μν, whichever is greater. • 1 mv fs null sensitivity on vibrating-reed electrometer. • 30 microvolt resolution. • 10 ,s ohms input resistance at 1 % off null (i nfinite at null) 0-500 v. • 500 ν floating operation off chassis gnd.
VIBRATING-REED ELECTROMETER • 1 mv fs to 500 ν in 10 voltage ranges. • 1013 or 1010 ohms i nput resistance, 1 mv to 1 v. • accuracy ± 3 % of full scale. • less than 2 mv per • 60 db line freq. rejection on 1 mv range. 1v, ima recorder output.
PRICE: S1575
KEITHLEY INSTRUMENTS
12415 Euclid Ave. . C l e v e l a n d , Ohio 44106 dc m i c r o v o l t m e t e r s
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differential voltmeters
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high voltage supplies
Circle No. 260 on Readers' Service Card VOL 38, NO. 2, FEBRUARY 1966
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