GENERAL RADIO COMPANY 732-B Operating Instructions Manual Download Page 7 | Manualshive

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Summary of Contents for 732-B

Page 1: ...ON KCBS 140 Je 3 Street San Francisco 5 Calif _ I _ FOR TYPE 732 DISTORTION AND NOISE METER 11 i TYPE 733 A OSCILLATOR AND TYPE 732 PI RANGE EXTENSION j_ FILTERS t FORM 518 C Jt 9 l GENERAL RADIO COMPANY C A M BRf DG A MA S sA CH u ET l sX ...

Page 2: ...lation and Operation Circuit Diagram TYPE 732 Pl RANGE EXTENSION FILTERS Description Block Diagram Installation Operation Suggestions for Use PHOTOGRAPHS PATENT NOTICE l 1 1 2 4 5 6 6 7 8 9 11 11 11 12 12 12 13 These instruments are manufactured and sold under patents of the American Telephone arld Telegraph Company solely for utili zation in re search investigation measurement testing instruction...

Page 3: ...s of 3 1 3 and 1 are provided andare selected by a multiplier switch The range for carrier noise measure ment is from 30 to 70 db below 100 modulation or 65 db below an audio frequency signal of zero level 1 22 Audio Frequency Range 380 420 cycles for distortion meas urements 30 24 000 cycles for noise or hum measurements For extend ing the distortion measurements range use Type 732 Pl Range Exten...

Page 4: ...f the harmonic voltage is then indicated by the attenuator and the output meter The attenuator dial is provided with a calibra ting position vhich is used to standardize the meter scale in terms of the original 400 cycle amplitude before making the measurement This setting is made by adjusting the amplifier gain for a full scale deflec tion on the meter when a fraction of the envelope amplitude is...

Page 5: ... Extension Filters are Distortion and Noise Meter 2 5 POWER SUPPLY the Type 732 B Distortion and of the instrument unless the used in conjunction with the Connect the instrument to the power line by means of the cord and plug assembly supplied The power line frequency can be from 40 to 60 cycles The power line voltage must be a s indi cated on the name plate near the power receptacle at the rear o...

Page 6: ...ning on and off the a c supply to the transmission monitoring assembly If the difference in level is large the locati on of the assembly or its orientation with respect to the s eech input equipment should be changed 3 0 OPERATION 3 1 RADIO FREQUENCY MEASUREMENTS With the power on and the carrier connected to the radio frequen cy terminals throw switch to TUNE CARRIER and t1 1ne for an exact maxi ...

Page 7: ...at the sendi ng end for refer ence at the CAL position Remove tone and read directly residual noise in db be low tone level Noise as l ow as 65 db down from a 6 milliwatt ref erence can be accurately measured 3 5 LINE VOLTAGE VARIATIONS Fluctuations 1n a c power line supply will cause slight fluctua tions of the indicating meters This is normal and is not an indica tion of trouble 3 6 CAUTION When...

Page 8: ... instrument if the Type 732 Pl Range Extension Fi lters are used the auxiliary connectors are replaced by two cabl es to the filters 5 SWITCH CONTACTS If trouble occur s at the switch contacts cl ean the contact s with carbon tetrachloride then apply a thin film of hi gh quality vaseline 5 5 SPARE PARTS The f ollowing spare parts are shipped wlth the instrument 2 Pllot Lampe 6 volt Mazda No 40 G R...

Page 9: ... MQ R 16 500 KQ R 17 30 KQ R 18 1 KQ R 19 20 KQ R 20 15 KQ R 21 100 KQ R 22 250 KQ R 23 2 MQ R 24 l KQ R 25 2 MQ R 26 3 K Q R 27 20 KQ R 28 2 MQ R 29 6 KQ R 30 6 KQ R 31 25 KQ R 32 50 KQ R 33 50 KQ R 34 15 81 KQ R 35 5 KQ R 36 2 239 Q R 37 73 lQ R 38 5 KQ R 39 10 KQ R 40 3 5 KQ R 41 100 KQ 7 C 1 139 1207 C 2 100 µµf C 3 10 µµf C 5 100 µµf c 6 0 02 µr C 7 0 5 µf C 8 0 02 µf C 9 0 02 µf C 10 0 1 µf ...

Page 10: ...www SteamPoweredRadio Com GENERAL RADIO COMPANY 0 0 i cs 0 0 TVHI CAl _ U O fl 11 Tt y Z FIGURE 2 Circuit diagram of Type 732 B Distortion and Noise Meter _ 8 ...

Page 11: ...ur e 1 The oscillator ls of the Hartley type A filter is used in t he output to eliminate harmonic voltages Output terminals for load impedances of 50 500 and 5000 ohms are provided Negligible distortion and mismatch occur vben a 600 ohm load is connected to the 500 ohm tap 1 2 OUTPUT The output ls available at jacks on the panel and at binding posts at rear Ll A potentiometer is provided for cont...

Page 12: ... plugged as desired into the speech input portion of the transmitter The maximum level obtain able from the Type 733 A Oscillator is about 7 5 db above a 6 milli watt reference and an output control is provided The output can therefor e be applied to the speech amplifier at the point where lines from the studios normally terminate The output transformer has a tapped secondary and the output impeda...

Page 13: ...he 400 cycle filter is in the Type 732 B Distor tion and Noise Meter At the other audio frequencies 50 100 1000 5000 and 7500 cy cles and at distortions greater than 0 5 the error is less than 1 of the true value _0 15 distort ion 1 4 PRINCIPLE OF OPERATION The block diagram of Figure 1 indicates how the Type 732 Pl Range Extension Filters operate 1n con junction with the Type 732 B Dis tortion an...

Page 14: ...less than 0 5 db for modulating frequencies and their harmonics below 25 kc it is advantageous to se lect the r f coil position in the Type 732 B Distortion and Noise Meter for the lover frequency range when there is a choice due to overlap of frequency ranges since the t uning capacitance will then be l over For example if the carrier frequency ls 1 Mc set the 732 P5 coil for the 0 5 l Mc positio...

Page 15: ...www SteamPoweredRadio Com GENERAL RADIO COMPANY FIGURE 1 Type 732 B Distortion and Noise Meter FIGURE 2 Type 732 Pl Range Extention Filters FIGURE 3 Type 733 A Oscillator 13 ...

Page 16: ...www SteamPoweredRadio Com t rJ P lf4 0tOi b ...

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