Page 1: ...equency range 50 Hz to 20 110 kHz Service Manual BN 9202 Series A Order No BN 9202 00 83 Edition 3341 1 86 replaces 3155 I 9 84 bn sche 0 29 1 86 Wandel Goltermann Subject to change w1 thout not1ce Pn...
Page 2: ...t 9 1 9 1 3 Output stage 9 2 9 2 Filter section circuit diagram 12 9 2 9 3 9 3 1 9 3 2 9 4 9 4 1 9 4 2 9 4 3 9 4 4 9 5 9 5 1 9 5 2 9 5 3 9 5 4 9 6 9 7 FIGURES 6 1 7 1 7 2 7 3 7 4 7 5 7 6 7 7 Automatic...
Page 3: ...o 8 4 8 7 Test configuration 8 4 8 8 Table for level display 8 5 8 9 Test configuration 8 5 8 10 Table for receiver frequency response 8 6 8 11 Test configuration 8 6 8 12 Table for checking the filte...
Page 4: ...ut only during manufacture of an instrument have generally been omitted The Appendix contains all block diagrams circuit diagrams parts lists and component layout plans of the printed circuit boards I...
Page 5: ...has been dis connected from all voltage sources see the circuit diagrams for these capacitors j Fuses Only fuses of the specified ratings may be used Repair replacement of parts Repairs are to be carr...
Page 6: ...insulated handles If work i s carried out on a printed circuit board or other subassemblies of the instrument while these are removed from the instrument and if these are not placed on a conductive D...
Page 7: ...whether these servicing instructions belong to the instrument to be repaired Type designation designation of the special version installed options series index and serial number Figure 7 2 shows where...
Page 8: ...ist I I l W Six Allen screws I li I M 4 X 12 W i I l i I V I j j I Top of _CJ Ill Ui Instrument Power supply H Si des and base of enclosure Compartment for Allen key Versacon key Spare fuse Board extr...
Page 9: ......
Page 10: ......
Page 11: ......
Page 12: ...7 12 TP 7 TP 2 TP 1 Ground c26 p 32 TP 3 Figure 7 6 Synthesizer 15 9202 QJ TP 5 P59 T 4 Power supply unit 17 TP 6 Ground...
Page 13: ...r o go3 V 7 mV Log slope adjustment measure at TP 4 pulse width 10 ms dB Solder on a capacitor with a value for a frequency of 1 MHz 5 Hz at TP 1 Mixer balance 40 kHz signal measure at TP 3 residual s...
Page 14: ...error of the test configuration used is negligible Otherwise the following rule applies If the error of the test configuration used is m and if the guaranteed error limits for the instrument being te...
Page 15: ...on the PMG 3 and PM 6614 are identical Change the frequencies with 51 and 9 Frequency Setting Error limits Test configuration error PMG 3 e m 19999 Hz 9 CONT 420 Hz 5 420 1 Hz Negligible 820 Hz 5 820...
Page 16: ...quency 50 Hz 200 Hz 820 Hz 5 kHz Error 1imi t e 0 5 dB 0 1 dB Ref 0 1 dB Test configuration 0 02 dB error m Figure 8 4 Table for send frequency response 8 4 G E N E R A T 0 R H A R M0 N I C D I S T 0...
Page 17: ...uency 50 Hz 300 Hz 820 Hz 3 kHz 20 kHz 2f 3f 41 dB 62 dB 62 dB 62 dB 62 dB Test con 0 7 1 5 dB 1 5 dB 1 5 dB 1 5 dB figuration error m Figure 8 6 Table for generator harmonic distortion ratio L E V E...
Page 18: ...le for level display 8 6 R E C E I V E R F R E Q U E N C Y R E S P 0 NS E Required test equipment Milliwatt Power Meter Test Probe Test Probe Adapter Calibration Adapter Level Generator r l f EPM 1 W...
Page 19: ...isplay at the various frequencies The difference be tween the results of the two measurements at each frequency must lie within the error limits e Frequency Error 1imi ts Test configuration setting on...
Page 20: ...k the indicated levels Measuring Filter Level Test configuration mode display error 6 8 dBm m Level 0 0 1 Noise Flat 0 0 5 sound programme Noise Weighted 0 1 0 sound programme 0 15 dBm Noise Flat 0 0...
Page 21: ...e functions of sockets A and B If one socket is connected to the in put then the other socket acts as an output socket Switch S 2 permits selection of normal termination or high impedance input The in...
Page 22: ...trument is set to the operating mode Receive thus preventing cross talk via the send receive switch S 4 9 2 F I L T E R S E C T I 0 N circuit diagram 12 The filter section provides 4 separate weightin...
Page 23: ...Hz in the operating modes Level and Sound programme and to 35kHz in the operating mode Noise Two rectifiers are provided a true RMS rectifier for level and noise measurements and a quasi peak rectifie...
Page 24: ...6 which has a gain of approximately 10 dB 0 10 dB attenuator IC 7 IC 8 P 33 IC 7 together with R 26 and R 27 forms the next 0 10 dB attenuator with C 58 for frequency compensation This attenuator dri...
Page 25: ...ier C 40 and C 41 block all DC voltages which may come from the preceding amplifier stages Quasi peak value rectifier IC 13 IC 14 1 3 IC 32 IC 13 IC 14 1 and the related components form a full wave re...
Page 26: ...causes the DC signal to again lie within the window Anal og digital converter IC 20 IC 15 4 IC 21 IC 22 1 IC 15 3 IC 29 2 The level of the signal has a maximum range of 1 8 dB while the DC signal rem...
Page 27: ...essing of the PMG 3 is carried out in the computer section This genera tes the level display information and contains most of the circuits for the frequency display The battery voltage monitoring circ...
Page 28: ...binary counter IC 26 The binary outputs of this counter are processed by gates IC 27 1 and 2 to form the gate times 40 ms and 200 ms Depending on the posi tion of the switch Resolution only one of the...
Page 29: ...e the sum of the attenuator in formation and A D result in the form of 3 1 2 BCD positions 9 4 4 GENERATION OF LEVEL INFORMATION The task of this circuit is to convert the information on the attenuato...
Page 30: ...The 0 1 bit is handled by the connection between the carry input of IC 15 and the complement control Gates IC 12 3 IC 12 4 and inverter IC 11 4 enable the two or eight bit input to IC 13 only in the...
Page 31: ...CKED LOOP PLL The phase locked loop is the heart of the frequency generator It generates a 40 to 60 kHz square signal from which the output frequency is derived The frequency resolution of this out pu...
Page 32: ...ng pulse generator A tachometer DC generator charges the series connected capacitor C 42 C 43 when the tuning knob is turned This charge is amplified by IC 26 and con nected to the two D inputs of the...
Page 33: ...thus reduces audio frequency harmonic distortion 9 6 D I S P L A Y UN I T 16 The display unit includes all display elements and various control circuits Two LCD d isplays are used for display of level...
Page 34: ...mit the charging current to approximately 200 mA The voltage regulators are three pole circuits with 15 V 1 A Capacitors C 3 to C 6 provide de coupling for the regulators Diodes Gl 6 and Gl 8 to Gl 10...
