GENERAL RADIO COMPANY
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Characteristics of a variable-capacitance diode at 1 kc with forward and reverse biasing. Behavior of an iron-core inductor at various d-c levels. Measurements made with the Bridge in its "Orthonull" position to eliminate sliding balances which occur when making low-Q measurements. Plot of capacitance change vs fre- quency for three types of capacitors. External generator used is a G-R Type 1210-C Unit R-C Oscillator. Variation of capacitance and dissipation factor of an unformed electrolytic a s a function of d-c voltage as it is varied to rated voltage and then returned to zero. D C VOLTAGE These Measurements show why it's called a Universal IMPEDANCE BRIDGE Features Orthonull,* a unique mechanical ganging arrangement of the Bridge's variable elements that eliminates sliding balances when making low-Q measurements. .M. s. Patent 2,872,639 • Completely self contained with built-in 1-kc oscillator and selective null detector... powered by four "D" batteries ... total drain is less than 10 ma, providing 1-year battery life for typical laboratory use. • Useful for measurements from 20c to 20 kc with external generator. • Unique cabinet design allows panel to be tilted to any con- venient angle ... closes and becomes a rugged carrying case for complete protection. • Provision for applying polarization voltages to capacitors, biasing voltages to diodes, and small currents to inductors for measurements at various d-c levels. «WIDE RANGES - R:0.001iitol0Mn L: 1 μΐι to lOOOh C: 1 MM f to 1000 μ\ D: 0.001 to 50 at 1 kc Q: 0.02 to 1000 at 1 kc «ACCURACY - \% for L and C from 20c to 20 kc 1% for R from 20c to 5 kc 5% for D and Q (ranges are a function of frequency) Type 1650-A Universal Impedance Bridge . . . $450 Write for Complete Information GENERAL RADIO COMPANY | Since 1915 —• Manufacturers of Electronic Apparatus for Science and Industry WEST CONCORD, MASSACHUSETTS NEW YORK AREA: Tel. Ν . Υ . WOrth 4-2722, Ν. J . WHitney 3-3140 CHICAGO: Tel. Village 8-9400 PHILADELPHIA: Tel. HAncock 4-7419 WASHINGTON, D. Ci Tel. JUniper 5-1088 SAN FRANCISCO: Tel. WHitecliff 8-8233 LOS ANGELES 38: Tel. Hollywood 9-6201 In CANADA, TORONTO: Tel. CHerry 6-2171 Circle No. 35 on Readers' Service Card The first general purpose R-L-C Bridge was our type 650-A which was introduced in 1933. It or successor designs, including the latest type 1650-A, are in use in almost every electronics laboratory and manufacturing plant today.
Transcript of GENERAL RADIO COMPANY
C h a r a c t e r i s t i c s o f a v a r i a b l e - c a p a c i t a n c e d i o d e a t 1 kc w i t h f o r w a r d a n d r e v e r s e b i a s i n g .
B e h a v i o r o f a n i r o n - c o r e i n d u c t o r a t v a r i o u s d-c l e v e l s . M e a s u r e m e n t s m a d e w i t h t h e B r i d g e in i t s " O r t h o n u l l " p o s i t i o n t o e l i m i n a t e s l i d i n g b a l a n c e s w h i c h o c c u r w h e n m a k i n g l ow-Q m e a s u r e m e n t s .
P l o t o f c a p a c i t a n c e c h a n g e vs f r e q u e n c y f o r t h r e e t y p e s o f c a p a c i t o r s . E x t e r n a l g e n e r a t o r u s e d is a G-R T y p e 1 2 1 0 - C U n i t R-C O s c i l l a t o r .
V a r i a t i o n o f c a p a c i t a n c e a n d d i s s i p a t i o n f a c t o r o f a n u n f o r m e d e l e c t r o l y t i c a s a f u n c t i o n o f d-c v o l t a g e as i t i s v a r i e d t o r a t e d v o l t a g e a n d t h e n r e t u r n e d t o z e r o . D C VOLTAGE
These Measurements show why it's called a Universal IMPEDANCE BRIDGE
Features Orthonull,* a unique mechanical ganging arrangement of the Bridge's variable elements that eliminates sliding balances when making low-Q m e a s u r e m e n t s . .M. s. Patent 2,872,639
• Completely self contained with built-in 1-kc oscillator and selective null detector... powered by four "D" batteries . . . total drain is less than 10 ma, providing 1-year battery life for typical laboratory use.
• Useful for measurements from 20c to 20 kc with external generator.
• Unique cabinet design allows panel to be tilted to any convenient angle . . . closes and becomes a rugged carrying case for complete protection.
• Provision for applying polarization voltages to capacitors, biasing voltages to diodes, and small currents to inductors for measurements at various d-c levels.
« W I D E R A N G E S -R:0.001iitol0Mn L: 1 μΐι to lOOOh C: 1 MMf to 1000 μ\ D: 0.001 to 50 at 1 kc
Q: 0.02 to 1000 at 1 kc « A C C U R A C Y -
\% for L and C from 20c to 20 kc 1% for R from 20c to 5 kc 5% for D and Q (ranges are a function of frequency)
Type 1650-A Universal Impedance Bridge . . . $450 Write for Complete Information
GENERAL RADIO COMPANY | Since 1915 —• Manufacturers of Electronic Apparatus for Science and Industry
W E S T C O N C O R D , M A S S A C H U S E T T S NEW YORK AREA: Tel. Ν . Υ. WOrth 4-2722, Ν . J . WHitney 3-3140 CHICAGO: Tel. Village 8-9400
PHILADELPHIA: Tel. HAncock 4-7419 WASHINGTON, D. C i Tel. JUniper 5-1088 SAN FRANCISCO: Tel. WHitecliff 8-8233 LOS ANGELES 38: Tel. Hollywood 9-6201
In CANADA, TORONTO: Tel. CHerry 6-2171 Circle No. 35 on Readers' Service Card
The first general purpose R-L-C Bridge was our type 650-A which was introduced in 1933. It o r successor designs, including the latest type 1650-A, are in use in almost every electronics labora to ry and manufacturing plant t oday .
