Delta Electronics OIB-3 Page 1 Instruction Book Download | Manualshive

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Summary of Contents for OIB-3

Page 1: ...RATING IMPEDANCE BRIDGE ARNI NG Dangerous radio frequency voLtages may be encountered vhen mea8uring high power 093 233 active circuits Exercise care i n grounding the instrument before applying power...

Page 2: ...2 In Line Impedance Measurement Under Power 6 2 3 Increased Detector Sensitivitv with TUNE Cir cuit 8 2 4 Operating With External Detector 8 2 5 Improving Precis i on by Substitu tion Method 9 2 6 Me...

Page 3: ...ont panel An internal detect or circuit is provided eo that when the bridge i s oper ating in a power circuit no other instruments are required An input adaptor and an external detector connector are...

Page 4: ...ower level A dummy load for example may have an operating impedance which varies with applied power levels Meaningful impe dance measurements must therefore be made at nor mal power level 1 3 Differen...

Page 5: ...OUT OPERATING IMPEDANCE BRIDGE 0 18 3 FIGURE 01B 3 OPERATING IMPEDANCE BRIDGE IN 4 www americanradiohistory com...

Page 6: ...itches When the adder switches are in the 0 position they are inactive When the switches are in other pos itions the values indicated are added to the reading of the R dial to obtain the resistance of...

Page 7: ...integrated circuit RF Amplifier is inserted before the detector circuit This amplifier increases the internal detector sensitivity for measurements in low power circuits Immediately to the left of th...

Page 8: ...The R and X dials are then adjusted for a minimum reading on the meter If t he reading on the meter i s decreased when the X di al i s advanced from zero the load i s inductTve and a null can be obt...

Page 9: ...ensitivity Additional s ensitivity can be obtained by switching the AMP IN OUT switch to the AMP IN position 2 4 Operating With External Detector At very low power levels the meter sensitivity may not...

Page 10: ...nitude of the R dial deviation is then a good esti mate of the error caused by the leakage The Delta Electronics RG l and RG 3 receiver generator sets are specifically designed for such use There is o...

Page 11: ...e the reactance of the cpapcitor after the null is re established will equal the inductive reactance of the load 2 6 Measuring Negative Impedances Quite often in complex antenna systems it is found th...

Page 12: ...al of the OIB 3 is calibrated below zero to about 5 ohms This facilitates measu rement of operating resistance Yalues near zero without the reversing technique described above 11 www americanradiohist...

Page 13: ...dard reactance The combination of these standards is identified as Z5 There will be two waves on the main transmission line one direct wave carrying energy from the gener ator to the load identified a...

Page 14: ..._w rlow Zoo p r J Z AI Z BI Figure 2 Simplified Schematic A 13 www americanradiohistory com...

Page 15: ...ns and solving for ZL Or ZOI Z02 Zs ZOI Z02 Y5 C 4 5 The load impedance is directly proportional to the shunt admittance of the standard circuit The constant of proportionality C is the product of the...

Page 16: ...e res i stance standard no longer exists When ZL is zero it is only nec essary that Ys and Yb be equal Neither is re quired to be zero It is not necessary to have a variable inductor for ca pacitive l...

Page 17: ...ted for both their RF characteristics and long term stability The variable R dial resistor Rl is a special precision low noise ceramet potentiometer The resistance adder resistor R4 and RS are high st...

Page 18: ...ODER 600 O 0 0 300 R9 RIO R RS 25 50 82 ISO J R 500 J SW 2 J Ll _ CI SW I R ADDER 0 100 C3 5 1600 lte X ZERO f SE T C 4 5 100 C3 1 00 500 r e e CI 532 It _ X _ 01 Al FMC SW3 X A DDER 9 100 C2 100 500...

Page 19: ...100 A 0 01 1 AI pA pF MI CP 6800 1 L 1 0pF _______D 3 1 4 _J NOTES I UNLESS OTHERWIS E SPECIFIEO A ALL RESISTORS ARE IN OHMS I FIXEDI B ALL CAPACITORS ARE IN PICOFARADS 2 INDICATES FR ONT PANEL CONTRO...

Page 20: ...c teristic of precision potentiometers For this reason the user may notice an apparent noise when obtaining a deep null with an external detector This is normal and does not affect the rated ac curacy...

Page 21: ...lOOf 009 00014 lO J lOaf 009 00014J lOaf 0076J 76 f eorrecting for frequency 76 68 52 True Resistance 10 52 9 48 Note that the correction is negative for capacitor loads and positive for inductor loa...

Page 22: ...RRE CTI ON FACTOR II I I f I b t7 1 iii IT It fyi il 21 1 x I I c 0 II i t II I 1 r Ii it I I II tt k f 0 I I j iii I 1 V f t l tV 1 1 I ttt I tt lt f S HO NOI l J31H IO 21 www americanradiohistory c...

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