OPERATING INSTRUCTIONS AND
Contents
1. Manufactured in Australia by ION PRODU NORTH SYDNEY OPERATING INSTRUCTIONS AND DESCRIPTION for VOLUME LNDICATOR Schedule C 7188 Contract 19396 Item Nos 5 Serial No HANDBOOK VOLUME CRED LG ATUR P M Ge Specification No 7224 GENERAL DESCRIPTION This instrument is a two stage amplifier employing two 6 AU 6 Valves with the output terminated with a 7500 ohm Vo Us Meter which conforms to the requirements set out in P M G Schedule C 7248 with an A type scale It has been designed to fully meet the requirements set out in P M G Specification 722A INPUT The input impedance is greater than 25 000 ohms over a frequency range from 30 cycles to 15 kilocycles The instrument can satisfactorily bridge levels from 40 V U to 33 Vo Access to the input of the instrument is available at both the terminal strip and the jacks on the front panel VeU METER The meter is calibrated from 20 V U to 3 VeUs in accordance with Schedule C 7248 and the input level is controlled by two attenuatops so that the measured output level will lie between 20 V U and 3 V U ATTENUATORS The first attenuator is a three step pu type attenuator calibrated 10 O 20 V U The second attenuator is a ten step potentiometer calibrated from 10 to 10 VeU in 2 V U steps the combined accuracy of these two attenuate is better than s 0 2 VeU at any setting when measured at 1 Ke se FREQUENCY RESPONSE The2. variation in gain for frequencies ranging from 30 cycles to 15 Ke s is less than 0 5 db from the gain measured at 1 Kc s CALIBRATION A potentiometer marked Calibrate is included in the circuit so that aging of the tubes can be compensated for and an exact adjustment can be made POWER SUPPLY This instrument is designed to operate from 132V D C Anode supply and a 24V D C A C Filament supply A filament on off switch is provided so that the imstrument may be switched off when not in use The off position of this switch provides a protective shunt across the V U Meter 1 ORIGINAL ISSUE CHANGE CHANGES OPERATIONS haf 20 Oka BIA JO o y qe Qu Pod Z 25Ka V V2 4 Watine i 3 d LAUG o O O 7 ti IMa RE R DN B75 C 0 O YE SI INPUT Cl 3 se 2 e HF o o y y 6804 RIO oe EI 45 Z 3900a v2 a 409 Rn een 6 So ie rend o LIO o a 2 2 14d 400 Ora 132 Our tin 50 ILI 7 v 14 INPUT IMPEDANCE FIL gn E ALSO The Lou imoederce shal be Froh greater Par L5000n of F 456 3 4 af le E A FREQUENCY RESPONSE V2 V a The reguercy Zesponse shell nof Aer Ly mora Shar OS db rem Me PIM 40a DG SE Lav of 1000 os over de Sreguereg range extending from HO GE do IS Kos o as 5 O RANGE RI cas S Ta qpersting range shal be ZI va and shall DRAWN _ TRANSMISSION PRODUCTS PTY LTD range trom SO vu Le ATT vd QUALITY TRACED COMMUNICATION ENCIN
3. EERS ACCURACY T SEE va CHECKED aa DENISON STREET NORTH SYDNEY aS Jaa PIIAXITIWSITI Error A Ed any setirig of Me LENGTH 1 000 DA Si de HE NA ed de hon UME INDICATOR A aberwator Shall nof exceed TO db where SHEETS 1 000 A ERR Rea measure gt VOOO ys ITEM FINISH Too S DATE USED ON AYYSYCAL PROGRAMME EQUIP A THIRD ANGLE PROJECTION DO NOT SCALE DRAWING REPORT ERRORS DRAWING NUMBER SCALE gt Riess sein PREPARE OU AAA A N09 MAL
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