1140-MS-B Hammond

Hammond Mfg. Co. Ltd., Electronics Division www.hammondmfg.com 1140-MS-B MICROPHONE ISOLATION TRANSFORMER 1:1:1 TURNS RATIO WITH DUAL SHIELDS This transformer provides isolation for a standard 150 microphone source into a 1000 microphone pre amp. This can be used as a straight isolation transformer or in a typical 3 way splitter application. It also has a wind bandwidth, and excellent shielding from the mu metal can. ELECTRICAL SPECIFICATIONS Characteristic Conditions Typical Input Impedance 150 Output Impedance 150/150 Primary Input 1kHz -20dbu 1140-MS-B 560K Test Circuit 3 Impedance PRI:ORG - BRN:150 GRY: SHIELD Secondary Output 1kHz -20dbu SEC:GRN - GRN/YEL:150 GRY/WHT: SHIELD 220 Test Circuit 4 Impedance SEC:RED - RED/YEL:150 GRY/YEL: SHIELD VIO: CAN GROUND 20Hz Maximum output Level +2.0db DATE Test Circuit 1 MADE IN CANADA DCR Primary 20 C 48.0 20 C Secondary 48.0/48.0 20 Hz, -20 dbu, 1140 - MS - B Frequency Response -0.20db Test Circuit 3 20 kHz, -20 dbu, PRIMARY SECONDARY 0.02db Test Circuit 3 ORG GRN Turns ratio 1:1:1 Common Mode 60 Hz 150 120db Test Circuit 2 Rejection Level 3kHz 90db GRN/YEL Test Circuit 2 1kHz -20 dbu GRY/WHT 150 THD 0.002% Test Circuit 1 RED 20Hz -20 dbu 0.10% Test Circuit 1 20 Hz 150 Phase Shift 2.5 Test Circuit 1 20 kHz BRN -5.0 RED/YEL Test Circuit 1 VIO Primary to Shield and Capacitance 500pf GRY GRY/YEL Case Secondary to Shield 500pf and Case Dielectric Strength 500 Vrms TYPICAL TEST CIRCUIT PRIMARY SECONDARY PRIMARY SECONDARY PRIMARY PRIMARY SECONDARY SECONDARY ORG GRN ORG GRN ORG ORG GRN GRN R R S R Z S / L O 1 2 / R 2 L V RL V R L V GRN/YEL GRN/YEL GRN/YEL GRN/YEL R S GRY/WHT Z i GRY/WHT GRY/WHT GRY/WHT RED RED RED Z R O 2 RED L R V R V L L V RL BRN RED/YEL BRN BRN RED/YEL RED/YEL GRY GRY/YEL BRN R S RED/YEL / R 2 S GRY GRY/YEL / GRY GRY/YEL 2 GRY/YEL GRY TEST CIRCUIT 2 TEST CIRCUIT 4 TEST CIRCUIT 1 Load Resistor Removed for Impedance measurement TEST CIRCUIT 3 Measurement instruments: Hp4192a Impedance Analyzer Hp3456a DVM Keithley 2002 DVM D scope series iii audio analyzer This drawing and the information in it is the property of Hammond Manufacturing. It may not be reproduced, transmitted or used in any manner whatsoever without the written permission of Hammond Manufacturing. Data subject to change without notice.