ms8n3 - Jensen Transformers
Contents
1. 1 l r 3 4 i 6 S 8 3 000 3 000 3 000 3 000 t 76 2 G6 2 6 25 T 76 2 4 T t E 1 500 c E tbc uad 38 15 e TE 3 469 i ener 2U LAYOUT 8 CHANNELS 19 000 482 6 x EE EE RES n J 38 1 J i E IE IE IE tb ALL HOLES ARE a E 5 5 a e t 8 32 CLEARANCE S 0 172 DIA 4 37 DIA 3 000 76 2 3 Cs TEL b p 7 IE IE j 4 000 TER 4 I i I i r 35008 7U LAYOUT 56 CHANNELS i ED n M zi 3 000 06 2 i ERE a 1 7197 D 43 75 c z JENSEN TRANSFORMERS INC 4 Jensen eE EEA 2 125 j 2 375 j 2 3757 e 2 83757 A 2 375 j 2 3757 j 2 3757 A 2 625 JT MS SN3 19 EIA RACK PANEL LAYOUTS 54 05 60 35 60 3 60 3 60 3 60 3 60 35 66 7 ENGINEER DPR Jeer SHEET 1 OF 1 COPVRIGHT 2001 JENSEN TRANSFORMERS INC B parE 08714701 1 T 2 7 a T 4 T 5 T D T 8 Figure 4 2 1 Rack Panel Drilling Guides Printed in U S A Copyright 2001 Jensen Transformers Inc 7 Section 3 Specifications 3 1 Electrical Specifications 3 1 1 Frequency Response 150 Ohm source 1500 Ohm preamp load at each isolated output High Frequency 3dB Cutoff Isolated OuipubT 24 2 sooo d tun bal goatee don Nat RUP Dp o ap d 108kHz Isolated Ottplil 2 opas ed pU QUI RE Taxe SOLE PE HOT 130kHz Low Frequency 3dB Cutoff Isolated Otutpild ceu Esta e pr A SCREEN ER P PL2. incidental damages Printed in U S A Copyright O 2001 Jensen Transformers Inc 10
3. or vibration to prevent breakage J2 BI 931 wo J32 JH o 442 die J52 61 J62 J71 o J72 81 J82 J91 oa zo 8 O oo 2 o JT101 0101 REV B JENSEN TRANSFORMERS INC Figure 2 3 Component Layout Printed in U S A Copyright O 2001 Jensen Transformers Inc 6 2 4 Mounting The JT MS 8N3 is equipped with three sets of mounting holes to provide the flexibility required to accommodate many different types of installation requirements It may be mounted either vertically or horizontally on a 19 rack type panel or it may be secured to a wall or bulkhead 2 4 1 Rack Panel Mounting Four 8 32 PEM type fasteners are provided along the bottom mounting flange of the JT MS 8N3 for mounting to standard 19 rack panels A single JT MS 8N3 unit may be mounted horizontally to a 2U rack panel Up to seven JT MS 8N3 units may be mounted vertically to a 7U rack panel See Figure 2 4 1 for 2U and 7U rack panel drilling guides 2 4 2 Bulkhead Panel Mounting Four 0 172 diameter mounting holes are provided along the bottom mounting flange and along the top edge of the JT MS 8N3 for mounting the unit with the printed circuit board either parallel to or perpendicular to a bulkhead or wall If the unit is mounted with the printed circuit board parallel to the bulkhead or wall four right angle mounting brackets may be also used to attach the bottom flange to the wall for additional rigidity
4. 8 Channels 48 Volts 53 milliamps Maximum Phantom Power Current All 8 Channels Shorted 56 Volts 125 milliamps Printed in U S A Copyright 2001 Jensen Transformers Inc 8 3 2 Mechanical and Environmental Specifications 3 2 1 Dimensions Eength x pao Arte cedo Rb dna Desa each b SUE D UR as wee 11 35 Inches 288 3 mm MICH x oo Ed Ub Lise Lc A EIL D LE s 4 75 Inches 120 6 mm Height x4 524 oes ae OR toL ee hee CASAL Md MeL DA faa 2 25 Inches 57 1 mm 3 2 2 Weight Net Weight Including all 34 Plug in Connectors and Mtg Screws 3 75 Ib 1 70 kg Shipping Weight vent eee ert li Sent E 6 wee atl M e des 4 5 Ib 2 1 kg 3 2 3 Temperature Range and Humidity Operation or Storage Temperature 32 to 158 Fahrenheit 0 to 70 Centigrade ele EEN 10 to 90 non condensing 1 S 3 l 4 i i l 6 S 8 JT MS 8N3 MOUNTING DIMENSIONS 1 250 4 1 009 a 0 000 n 31 8 25 4 a B B B B f 0 375 u 9 5 ch m B 1 000 a 25 4 BACK U m 4 750 e 120 6 0 575 13 3 2 250 E 57 1 BOTTOM c A A A A 1 350 A PEM S 832 2 34 3 8 32 THREAD 9 500 12 7 DEPTH MAX 8 500 G 8 B 4 PLACES m 12 7 eae 29 8 B 20 172 4 37 DIA k 1 175 4 106 05 8 PLRCES 4 175 182 2 7 175 258 4 10 175 11 350 s 288 3 DIMENSIONS IN INCHES M
5. Am A a AR ES E A 8 AE 5 aL m wm Ho De Mm sm wm o ww cuam m mwam aw wm en m en ms e Aw E wu E M e HN ww Wy HW HAN A u JT MS 8N3 8 Channel 3 Way Microphone Splitter with Phantom Power Circuitry USER MANUAL Revision 2 0 Table of Contents Section 1 Introduction eh Section 2 Installation 2 1 Circuit Description and Jumper Settings Figure 2 1 Schematic Diagram 2 1 1 Reference Designators 43 gest Chen DLE Vu whe hols HIM Si ENR a A Iob e ded 2 1 2 Input Output Connections s oo c COR pex DOC OR See OD ree 2 1 38 Phantom Power Circuitry and Switches 0 0 0 00 0000 cece eee eee 2 1 4 Ground Lift Circuitry and Switches 4 2 coax ER ESO EU Seeks 2 2 Power and Ground Wiring 2 2 1 Chassis and Groundplane Connections 0 00 e eee eee 2 2 2 Phantom Power Supply Connections 0 2 3 Input and Output Wiring 21 oput Wiring S Set me seated Aat kie e M E EE 29 2 COUIDUD VUNG Sse det ene eoe D Suan CR Erico os AES BUDE ORARE Solos dois Figure 2 3 Component Layout 0000s 2 4 Mounting 2 4 1 Rack Panel Mounting o rS oe OE S SUV Rr oe ER Paw SERS 2 4 2 Bulkhead Panel Mounting llle Figure 2 4 1 Rack Panel Drilling Guides Section 3 Specifications and Physical Dimensions 3 1 Electrical Specifications 3 1 1 Frequency Response A acero CO e ek Chee dA E ip y o e Ser Y EG 3 1 2 Level Handling and Distortion 2223s cee ee
6. ILLIMETERS z JENSEN TRANSFORMERS INC Jensen 22207 amp CH 3 WAY MIC SPLITTER ENGINEER DPR REU A COPYRIGHT 2001 JENSEN TRANSFORMERS INC B SE SE JT MS 8N3 1 2 3 T 4 T 5 6 T 7 8 Figure 3 2 1 Mechanical Dimensions Printed in U S A Copyright O 2001 Jensen Transformers Inc 9 Section 4 Warranty For a period of 1 YEAR after purchase Jensen Transformers Inc will free of charge repair or replace any part of an ISO MAX product that fails due to defective materials or workmanship For a period of 20 YEARS after purchase Jensen Transformers Inc will free of charge repair or replace any Jensen OEM transformer or any Jensen transformer contained in an ISO MAXQG product that fails due to defective materials or workmanship Both limited warranties are subject to the following limitations 1 Defects that are in the sole judgement of Jensen the result of accident misuse abuse neglect mishandling misapplication faulty installation unauthorized repair modification or acts of God will not be covered by this warranty 2 In the absence of proof of date of purchase the date of manufacture as determined from lot numbers of internal parts and the records of Jensen Transformers Inc shall be used in its place 3 There are no express warranties except as listed above 4 JENSEN TRANSFORMERS INC SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF THIS PRODUCT OR ARISI
7. NG OUT OF THE BREACH OF THIS WARRANTY Duration of implied warranties if any is limited to 12 months If a problem develops with this product during the warranty period call or write us before attempting any repair We can help you identify specific problems and possibly solve the problem before the unit is returned to us for repair or replacement In any case DO NOT RETURN THE UNIT WITHOUT AUTHORIZATION and instructions from us Jensen cannot be responsible for damage due to shipping or improper packaging Limitations of Liability The information provided by Jensen about its products been checked and is believed to be accurate however no responsibility is assumed by Jensen for its use nor for any infringements of patents which may result from its use No license is granted by implication or otherwise under any patent or patent right of Jensen Transformers Inc JENSEN PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS OR IN ANY APPLICATION WHERE THEIR FAILURE COULD CAUSE INJURY OR DEATH Jensen reserves the right to make changes without further notice to any of its products Jensen makes no warranty representation or guarantee regarding the suitability of any of its products for any particular purpose nor does Jensen assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation consequential or
8. Output Connections The JT MS 8N3 is based upon the Jensen JT MB DPC microphone splitter transformer which has a Faraday shielded input winding and two Faraday shielded output windings Connections for the input winding and a parallel through connection are provided on connector J11 Connections for the two isolated output windings are provided on J12 A three pin removable plug for each input and output is provided with the JT MS 8N3 unit 2 1 3 Phantom Power Circuitry and Switches Each of the eight channels are provided with the circuitry and switching necessary to provide standard 48 Volt phantom power to the microphone input All eight channels share a common phantom power supply A 3 pin header P1 is provided on each channel for attachment of an SPDT switch if phantom power must be turned on and off frequently Components R18 and C14 provide filtering to prevent on off transients and to remove any residual noise from the Printed in U S A Copyright O 2001 Jensen Transformers Inc phantom power supply before it reaches the microphone input Resistor R15 discharges C14 to ground if the connections to J13 are left open inadvertently Resistors R16 and R17 provide the phantom power to the microphone input and are precision matched to maintain balanced common mode input impedances Dipswitch positions 1 1 S1 2 and S1 3 allow the phantom power connections to be either connected or completely disconnected from the microphone input Under no
9. U VERLA S 0 4Hz Isolated Output ta ee se ea t e e it et teal M vi we 0 4Hz 20Hz 20kHz Response re 1kHz Isolated Output 1 A vo ena m dee boe eR Rt her ed e 0 10dB 0 10dB Isolated Output 2 edu cot tuk oe Gawd d ES MORI ak An das dol Sas 0 10dB 0 04dB 3 1 2 Level Handling and Distortion Maximum 20Hz Input Level at 1 THD 0000 4 2dBu 0 975V Maximum 50Hz Input Level at 1 THD 10dBu 2 449V Total Harmonic Distortion at 20Hz and 20dBu 0 ee 0 05 Total Harmonic Distortion at 1kHz and 20dBu 0 0 0 0 0 001 3 1 3 Input Impedance Input Impedance with no preamp loads 1 52k Ohms Input Impedance with 1 1500 Ohm preamp load 818 Ohms Input Impedance with 2 1500 Ohm preamp loads 569 Ohms 3 1 4 Losses Output with 1500 Ohm preamp load referenced to Input Isolated Output 23 5 coss EE 1 32dB Isolated Output 2 4 nb Ste autos AI EE Ce SE Vm GP NO al ted 1 25dB 3 1 5 Common Mode Rejection Ratio 60Hz CMRR Isolated Output HAs uar but ucl pelas d NU eate aae Er ow Cis sd 120dB Isolated Output 2 jects grag Oe ede Hae a OR OR TR OER FOE ROR RR EROS 110dB 3kHz CMRR Isolated Uti L ou aca tied Vici a hank qe ee b Efi e tka ate Y wed federa 90dB Icolated EE d de un ee A Bara es 80dB 3 1 6 Phantom Power Requirements Nominal Input Voltage 5x 2c an EROR RORIS date K AIRES UD E ERR 48 Volts Maximum Input Voltage ovibus sehe Eure stud Re ENDE RT 56 Volts Nominal Phantom Current Total of
10. e Switchable Phantom Power Circuitry Provided on all Channels Typical Distortion of only 0 001 at 1kHz Extremely Wide 0 5Hz to 100kHz Bandwidth e Compact Form Factor Allows High Packaging Density Rugged Steel Frame and 0 093 PCB Provide Added Durability Printed in U S A Copyright 2001 Jensen Transformers Inc 3 Section 2 Installation 2 1 Circuit Description and Jumper Settings T S1 RIB 4 di La 2958 ee ll mBksei R18 Jii Sl R17 eaa e ole 3 319 6k81 RISS c14 475k wa Sha Jii pis Pi 3 1 ois Wei 3 Ti 48C JT MBDPC 3 x ces T a E 3313 i 3ke1 Jii E E e See ra 4 Tas r kp J11 4 1d i 5 ile 1 gt ce Rig BT Ske1 JIZ ERE ME 3 a S1 Cli R12 Rit Cle i n T ik ik T i n Lg 4 8 o WC iva Figure 2 1 Schematic Diagram Typ of 8 2 1 1 Reference Designators The schematic diagram shown in Figure 1 is representative of each of the eight channels of the JT MS 8N3 Microphone Splitter Reference designators for the other seven channels are determined as follows Switch transformer and plug reference designators correspond to the channel number while resistor capacitor and jack reference designators are formed by adding a digit representing the channel number ahead of the nominal part reference number For example channel 1 resistors are numbered R11 R12 R19 and channel 3 capacitors are numbered C31 C32 C34 2 1 2 Input
11. nnection at P10 If alternate grounding connections are required for some reason this jumper may be moved to its alternate position and the groundplane connection may be hard wired through the GND terminals on J91 Wire sizes between 14 and 26 gauge either stranded or solid may be used to make connections to the JT MS 8N3 Stranded wire should be used if connections will be subjected to repeated movement or vibration to prevent breakage 2 2 2 Phantom Power Supply Connections The JT MS 8N3 is designed to be used with a 48 Volt to 52 Volt phantom power supply Normally a 48 Volt supply will work fine In some cases though when using microphones that require the maximum 48 Volt power to be available for proper operation the phantom power supply may need to be adjusted to 52 Volts to overcome the slight drop in voltage that occurs across the transient filtering network consists of R18 and C14 A power supply with a floating transformer isolated secondary such as a typical linear AC DC supply should be used to prevent creating any inadvertent paths to ground The positive terminal of the power supply should be connected to the 48 terminal of J91 The negative or common terminal of the power supply should be connected to the 48C terminal of J91 Parallel through connections are provided on J91 to facilitate daisy chaining of the phantom power connections when utilizing multiple JT MS 8N3 assemblies Wire sizes between 14 and 26 gauge ei
12. rmal circumstances these three switches should be either all ON or all OFF 2 1 4 Ground Lift Circuitry and Switches Ground switching is provided for each individual input and output to allow maximum flexibility in the grounding and termination of the splitter transformer shield connections Dipswitch S1 4 controls whether the microphone input shield is floating or connected to ground through a low impedance network Resistor R13 provides a low impedance to ground at low frequencies and capacitor C13 provides a low impedance to ground at high frequencies when S1 4 is in the default ON position This low impedance network is used instead of a hard ground connection to limit circulating currents between devices that might potentially create a ground loop problem Dipswitch positions S1 5 and S1 6 connect the isolated output winding shields of the microphone splitter transformer to ground through low impedance networks consisting of R11 C12 R12 and C11 when the switches are in the ON position The default position of S1 5 and S1 6 is OFF to simulate a floating microphone at the isolated output 2 2 Power and Ground Wiring 2 2 1 Chassis and Groundplane Connections The JT MS 8N3 incorporates a groundplane on the top component side of the printed circuit board to provide a very low impedance for the individual input and output ground dipswitch connections This groundplane is normally connected to the steel chassis plate by the default jumper co
13. s Zou eee EE 3 1 3 Tint mpedatice bt Ee a dol Sak hve Ae Ste Ga AEM Side Aes exse 4358 SE Bosses IC 3 1 5 Common Mode Rejection Ratio 2 0 eee 3 1 6 Phantom Power Requirements 20 5 a usse x cs Ge ENN eR 3 2 Mechanical and Environmental Specifications Bie al Dimensions se Sus a a thes e pad de aw Mee RU quM Figure 3 2 1 Mechanical Dimensions 0 000000 00a 2L WUT S a eu x etate tu etui ope dores uh e e dried diuo soo Ure Celle AN 3 2 8 Temperature Range and Humidity 0 0 Section 4 Warranty T TLuuuuss sese es Printed in U S A Copyright O 2001 Jensen Transformers Inc Section 1 Introduction The Jensen JT MS 8N3 provides 8 channels of extremely high quality 3 way microphone splitting with 48 Volt phantom power individually selectable on each channel This functionality is provided in a compact 11 35 W x 4 75 H x 2 25 D package allowing 7 units 56 channels to be mounted vertically on a 7U size rack panel see Figure 2 4 1 Excellent frequency response and extremely low distortion are provided by the Jensen JT MB DPC microphone splitting transformers that are used in the JT MS 8N3 Features 8 Channels of Microphone Splitting Isolation Removable Screw Terminal I O Connectors Input Direct Output and 2 Isolated Outputs per Channel Individual Faraday Shields on All Inputs and Outputs for Maximum Noise Immunity Ground Lift Switches Provided for Input and Each Output
14. ther stranded or solid may be used to make connections to the JT MS 8N3 Stranded wire should be used if connections will be subjected to repeated movement or vibration to prevent Printed in U S A Copyright O 2001 Jensen Transformers Inc 5 breakage Under normal circumstances the low side of the phantom power supply 48C is connected directly to the groundplane GND through the jumper at P9 If this needs to be changed for some reason the jumper may be moved to its alternate position and the phantom power supply common 48C on J91 may connected to some other reference point 2 3 Input and Output Wiring In order to avoid wiring confusion the HI LO and SHIELD connections are arranged in the same order for each of the INPUT THRU OUTPUT 1 and OUTPUT 2 connector positions 2 3 1 Input Wiring INPUT and THRU connections are provided on pins 1 through 6 of J11 INPUT HI LO and Shield connections are on pins 1 2 and 3 respectively THRU HI LO and Shield connections are on pins 4 5 and 6 respectively 2 3 2 Output Wiring Isolated Output connections are provided on pins 1 through 6 of J12 OUTPUT 1 HI LO and Shield connections are on pins 1 2 and 3 respectively OUTPUT 2 HI LO and Shield connections are on pins 4 5 and 6 respectively Wire sizes between 14 and 26 gauge either stranded or solid may be used to make connections to the JT MS 8N3 Stranded wire should be used if connections will be subjected to repeated movement
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