GR 1650-A Operating Instructions Manual Download Page 10 | Manualshive

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Summary of Contents for 1650-A

Page 1: ...GENERAL RADIO COMPAN Y OPERATING INSTRUCTIQ S TYPE 1650 A IMPEDANCE BRIDGE 3005 C...

Page 2: ...Q PERATING INSTRUCTIONS TYPE 1650 A IMPEDANCE BRIDGE Form 300S C April 1960 G E N E R A L R A D I 0 COM PAN Y WEST CONCORD MASSACHUSETTS USA...

Page 3: ...L AC GENERATOR 6 1 Procedure 6 2 Connection of External Generator 6 3 Maximum AC Voltage 6 4 Allowable D and Q Ranges vs Frequency 6 5 Corrections for Residual and Lead Impedances 6 6 Extending the D...

Page 4: ...ance measure ments Accessories Supplied One Type 274 MB Double Plug Other Accessories Available Type 1650 P1 Test Jig Other Accessories Required None Earphones may be used for high precision at extrem...

Page 5: ...Figure 1 Type 1650 A Impedance Bridge...

Page 6: ...l of the Type 1650 A Impedance Bridge TABLE OF CONTROLS Name No Type Function CRL MULTIPLIER Sl 8 po ition selector switch Selects impedance range CRL SELECTOR S2 5 position selector switch Selects br...

Page 7: ...tor c Izl lR2 X2 GENERAL RADIO COMPANY Lp R Rs Rp X z Q 1 2 SYMBOLS ABBREVIATIONS AND DEFINITIONS The following symbols abbreviations and defini tions are used on the panel of the Type 1650 A and this...

Page 8: ...Both ac and dc measurements may be made with the bridge which has no internal phase balance The variable bridge components are General Radio precision wire wound rheostats The CRL rheostat uses a mech...

Page 9: ...several compensating schemes are used The com ponents used for this purpose are listed below with brief description of their functions SENS SENS C2 and LI These components are used to make the standar...

Page 10: ...al ac null indication and the output from the amplifier is supplied to the panel DET OUTPUT terminals The ac oscillator and detector combined draw less than 10 rna from the internal 6 volt battery 2 5...

Page 11: ...Figure 8 which is a plot of the numbers of adjust ments necessary for a balance Not only does the Orthonull reduce the number of balances but it per mits 1 measurements that would otherwise be im poss...

Page 12: ...ost fully counterclockwise c Set the CRL SELECTOR to R d Connect the resistor to be measured to the UNKNOWN terminals e Turn the function switch to INT 6 V NOTE As the function switchis rotatedfrom OF...

Page 13: ...from damage It is also ad visable to limit the current to 5 rna or less to pro tect the operator from injury The maximum volt age limit and standard EIA test voltages are de scribed below Unless the...

Page 14: ...esired and D is between 0 1 and SO Note Cs Cp within 1 if D 0 1 d Set the function switch to INT 1 KC e Connect the unknown capacitor to the UN KNOWN terminals f If the proper range setting of the CRL...

Page 15: ...ntrol to give an upscale meter reading and adjust the CRL MUL TIPLIER switch for a minimum deflection g Adjust the CRL control and the DQ control for the best minimum meter reading The SENSI TIVITY co...

Page 16: ...ect but Cb shunts the CRL rheostat Capacitance across this rheostat 5 3 2 ACCURACY OF AC RESISTANCE MEAS UREMENTS The accuracy of the R reading is 1 if the balance is made between 1 and 11 on the CRL...

Page 17: ...used as a reference as is done on GR Type 1481 Stand ard Inductors To obtain this value plot Lvs volt age applied and extrapolate to zero voltage The OSC LEVEL control permits such measurements and i...

Page 18: ...fier and Null Detector with appropriate filter can be used 6 2 CONNECTION OF EXTERNAL GENERATOR The external generator may be connected to the bridge by anyone of several methods The choice depends on...

Page 19: ...e maximum voltage is limited to Emax f volts rms f in cps or 60 volts rms whichever is smaller With 60 volts inputthe maximum power to the bridge 14 is 1 2 watt and the open circuit secondary voltage...

Page 20: ...0 and high Q scales are inversely proportional to frequency and the effects of the in temal and xterna1 resistors are therefore not ad ditive The DQ rheostat should be set to a minimum high Q 0 or hi...

Page 21: ...ns for their use C measured The same precautions mentioned in Method 1 apply here and a blocking capacitor should be added between the internal terminals 16 and 17 which are directly behind the BIAS t...

Page 22: ...dc to zero before disconnecting the dc supply or unknown inductor 7 2 APPLICATION OF DIRECT CURRENT IN IN DUCTORS Direct current may be supplied to in ductors during measurement by any of several dif...

Page 23: ...ods of applying dc are shown in Figure 17 Method 1 See Figure 17a In this method all of the current supplied flows through the unknown The current is limited to the amount given in Table 7 The dc sour...

Page 24: ...ith Reactance Note that R series R parallel within 1 as long as Q is less than 0 1 The formulas are 1 where Rb 10 kn except on the 10Mn range wh re it is 1 kn If the unknown is inductive the external...

Page 25: ...ground connection to the jig and also holds the connector in place The leads of the test jig may be brought around in back of and underneath the bridge so that the jig 20 may be located directly in f...

Page 26: ...included here but should be used only when the operator is positive that the component in question requires re adjustment C5 This capacitor is set to give a zero 0 reading when a 1000 1l 3 terminal ai...

Page 27: ...oltages are listed in Table 8 This information should enable one skilled in the art to locate any faulty components in these circuits For access to the printed circuit shown in Figure 20 unfasten the...

Page 28: ...TYPE 1650 A IMPEDANCE BRIDGE a J en et m Figure 21 Rear Interior View 23...

Page 29: ...63 Ul R104 150 5 1 2 w REC 20BF C1l6 5 50 dcwv COE 57 Ul R105 gO k 5 1 2 w REC 20BF R106 120 k 5 1 2 w REC 20BF lU07 20 k 5 1 2 w REC 20BF R108 4 7 k 5 1 2 w REC 20BF R109 18 k 1 1 8 w REF 60 RllO 18...

Page 30: ...aD R6 R7 R8 R5 9 0 90 900 RIO 982 10K RI2 R 3 UNKNOWN 30K 9701 5 IM IL CRL MULTI PLIER DETECTOR IKC T __ cr 47 Figure 22 Schematic Diagram 51 CRL 52 J5 DET OUTPUT t J6 OFF INTI KC INT 6V A C DC 53 EX...

Page 31: ...NS OCI IT S2 209RrR J 1J3 018 J 1t d 4 ID II 1 1 7 N I 1 It liDR 0 1 1 I RD IL __ I lF I r I iI T f D e JYE I XT EN k I I ltD u I oI fC I I I S J 1 S2 It I I I I 1 I 1 40llt 410 o V I I I 2 5K I r I I...

Page 32: ...elNT 6V DC eEXT cRL MULTIPLIER OfF e AC EXT INTI KC e I I I I I If t I j J5 DET bUTPUT l fJ6 18K 54 DETECTOR IKC FLAT CII4 a II o RI6 50K SEN5rAC SENS rAC I z CIOIA PAOI i11IIf 1T _R D D R F V II I II...

Page 33: ...WEST WEST COAST EAST COAST NEW YORK General Radio Company Service Department 1000 N Seward St Los Angeles 38 Calif Telephone HOllywood 9 6201 CANADA REPAIR 10 RA GENERAL EM e on 9 4400 PHILADELPHIA 11...

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