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RCA VoltOhmyst WV-77C, Specifications, Operation, Applications, Maintenance

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RCA VoltOhmyst WV-77C Specifications, Operation, Applications, Maintenance Download Page 10

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Summary of Contents for VoltOhmyst WV-77C

Page 1: ... ELECTRONIC METER r SpecifkatioriS Operation Applications Maintenance ZfRO AUI s AOJ WV_77C i V 6QV 12 V R fOOQ JOD v At VDtTS R 1D R 1001 VOLTS VOlTS IZOOV Off 0 liS 1 NEG H y RADIO CORPORATION 0 AMEN rCA TEST AND MEASURING EOUIPMENT ARRISON_ N J ...

Page 2: ... insulation provide the additional hazard of high voltages appear ing at exposed points along the leads Check test leads for frayed or broken insulation before working with them 4 To lessen the danger of accidental shock discon nect test leads immediately after test is completed 5 Remember that the risk of severe shock is only one of the possible hazards Even a minor shock can place the operator i...

Page 3: ...cement Parts List 0 1 MILl1WATTS IN 600 0HM RESISTIVE LOAD AT 1000 CPS 10 100 2 4 4 5 5 8 8 9 10 11 10 4 Q U 0 3 I a 2 z w 1 W W U Z W 0 W W 0 w D U w I a D a 0 0 1 _ D 0 1 6 7 8 g 10 ACROSS 600 0HM RESISTIVE LOAD AT 1000 CPS 6 7 6 g 100 4 7 8 g I 0 0 775 A C VOLTS RMS MEASURED 92CS 7130 Note For loads other than 600 ohms sec lable on page 10 Figure 1 Chart for conversion of rms voltage to dbm val...

Page 4: ... grid to cathode potential of V2B a condition which modifies the cathode current of V2B When for ex ample the current flow through V2A increases the flow of current through V2B decrea ses The meter reading is proportional to the difference between the plate currents of the triodes AdditlOnal features of the VV 77C include provi sion for zero center indication useful in descriminator and bias measu...

Page 5: ...nt Power Supply Voltage Rating Frequency Rating Consumption _ 1 R ll 12ALS 1 RCA 12AU7 105 to 125 volts 50 to 60 cps 5 watts approx Battery 1 5 volt cell RCA Type VS036 Mechanical Over all I leight Width Depth Weight Dimensions 8 inches 5 inches 4 inches 4 pounds The frequency response shown is for only the 12 and 60 volt range The in tnllnent is accurate at pnwer line frequencies for all ranges A...

Page 6: ...e measurements are made the power should be removed from the equipment under test so that no voltages are present in the equipment 1 Set the function selector to OHMS position 2_ Set the range selector to the position nearest to the value under measurement 3 Connect the probe tip to the ground clip and adjust the ZERO ADJ control to position the pointer at the left hand 0 if necessary 4 Disconnect...

Page 7: ...deflection 6 Read the ac voltage from the scale corresponding to the range selector setting NOTE Jj the 2 1 111egohm de input of the WV 77C loads the test circuit appreciably when making ac measurements in the presence of dc a suitable blocking capacitor should be used ahead of the WG 299B probe to prevent this loading effect For this purpose a high quality 10 leakage paper capacitor of 0 5 uf or ...

Page 8: ...n oscillator tube is always proportional to the amplitude of oscilla tion The WV 77C has high input impedance and can be used to measure this bias voltage_ Comparative read ings should be taken on each band of a multi band receiver The ganged tuning capacitor should be ro tated through each band while the bias is measured AGe AVe Voltage Mca8urements Since the VV 77C has a high input resistance it...

Page 9: ...ependent upon the quality and tolerances of its circuit components If it becomes necessary to replace a component part the stock number can be found in the Replaeemcnt Parts List page 11 Only RCA replacement parts or parts which have equivalent specifications should be used Zero Setting of Pointer Mechanical Adjustment The pointer should rest at 0 when the power is off If the pointer should come t...

Page 10: ... ci 0 g 0 0 N INn_ VIc CD N n T 1 g l h cO N n i6 cO Ji 0 1013 0 a wa n Iv N f _ I I 1 w uV w W I I a 01 E0l J I I J o I I o0a u I L I _ N A L u 0 wu1 wIZ II 0 E rl Q 0 I Z 1 I 0 m gzo 0 Ow w 1 E nVl3 6 w w a v w oJ I O I d 20 Na wn If W w cl v Z z ou t 0 v u 208 w w w w a W 11 wzx J Jo j r Zw a w Z 10 a Z y ...

Page 11: ...ohms 5 Yz watt 502347 Fixed composition 130 ohms 5 Yz watt 33571 Fixed composition 68 000 ohms 5 Yz watt 502368 Fixed composition 470 ohms 5 Yz watt 502147 Variable carbon 12 500 ohms 20 74 watt 213744 R 24 R 25 R 26 11 28 R 29 R 30 J ML PI S I 82 T I 11 WG 299B Dcl AC Ohms Probe and Cable Bushing tip for fl Ont housing 212161 Connector internal brass for cable 210190 A Connector cable female viLb...

Page 12: ... the meter pointer is at zero 4 Turn range switch to 1200V 5 If the meter pointer deviates from zero by more than one division 011 the 0 to 12 metcr scale replace thc 12AU7 see section on Tu be Replacement AC Zero Check J Set the range selector on 3V and the function selector on VOLTS 2 Rotate ZERO ADJ control until meter reads 10 volts on the 60V meter scale 3 Turn the function selector to AC VOL...

Page 13: ...I ...

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