EMT-FRANZ 156 Instruction Manual Download Page 36 | Manualshive

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Summary of Contents for 156

Page 1: ...www SteamPoweredRadio Com PDM Compressor EMT 156 EMT156TV ...

Page 2: ...www SteamPoweredRadio Com lnstructic n Manual PDM Cornpressor EMT156 EMT156T v March 1978 Applies to units starting with serial No 25 738 Constructions and circuits are subject to change without notice ...

Page 3: ...00unting holes 2 1 4 required clearance depth 14 1 4 I _ 1111111 nm I t ta l u I i 4 I I 1t _ 11 0 The unit is to be mounted using four screws The EMT 156 is delivered with the following accessories 2 2 male connectors Cannon XLR 3 12c female connectors Can9on XLR 3 llc Connector Lumberg sv 3 Connector Lumberg sv 5 AC mains cable fus e 0 8 A slo blo European standard f use 0 8 A slo blo USA tandar...

Page 4: ...lo fuse A 3 CHANGING THE A C MAINS VOLTAGE SETTING 1 Open the four quick release screws on the back right half panel 2 While holding down the locking spring pull out the power supply plug in until the A C mains selecting switch becomes accessible To change the mains voltage pull on the mains switch knob and then rotate it to the desired voltage either 110 or 220 V The 110 V position is used with a...

Page 5: ...tecker INPUT PLUG A 6 SELECTING THE REFERENCE LEVEL OUTPUT Stecker OUTPUT PLUG The EMT 156 compressor can be connected for any of the followi ng peak line levels 4 dBm 1 23 V 6 dBm 1 55 V 8 dBm 1 95 V 12 dBm 3 08 V 15 dBm 4 36 V The unit is normally shipped with the output transformer connecte d for 6 dBm and therefore the output transformer taps must be changec l if it is to be used with any of t...

Page 6: ...the same level 15 12 8 6 4 4 6 8 12 15 dBm Now r eplace the two plug ins and connect al kHz sine wave corres ponding to the 100 level to the input Connect an A C Volt meter to the output and push the buttons FUNCTION and either MAN or AUTO Using a screw driver adjust the input LEVEL control of both plu ins until the output line level is 9orrect Operation B l POWER ON Push the AC POWER button to tu...

Page 7: ...ng decrease in_ 9 in __ _s _ E ha __ t b peak valu_ e of_the output does not exceed the hre pol9 This can be seen from the diagram With just th e limiter function in operation the gain remains at unity corresponding to the 45 lirie until the level exceeds the adjustable th reshold corres ponding to the horizontal line red dot The point of inter section at which the 45 line and the horizontal line ...

Page 8: ...n is reduced below the maximwn which was set with this control In the above diagram this corresponds to an upward paralled shift of the 45 O dB amplification curve blue dot The blue COMPRESSION GAIN control allows this maximum gain to be varied from O dB to 18 dB 2 COMPRESSION RATIO This determines the density or dynamic range of high level program In the above diagram this corresponds to the slop...

Page 9: ...T COMPRESSOR The compression rotation point yellow dot is the point around which the compression curve is rotated In order that this point be unaffected by changes in t he COMPRESSION GAIN or COMPRESSION RA IO it is fixed on the O dB unity gain curve The point can be raised or lowered along the O dB amplification curve by adjusting the small yellow COMPR ROT POINT con rol between 1 5 dB and 6 dB A...

Page 10: ... In the diagram the line connecting the linear 45 compression gain curve to the low level O dB gain region is called the expansion line When operating in this region an increase in input level results in a increase in gain in contrast to the compression region until the maximum ga n is reached A decrease in input level results in a decrease in gain until the minimum of O dB unit gain is reached Th...

Page 11: ...ICE appendix The attack time for the limiter and e xpander sections is not adjustable They have the following values Limiter Expander 80 JUSec Program dependent 2 Release time manually adjus ted The release time for the Limiter Compressor and Expander can be manually adjusted using the three knobs labeled RELEASE TIME tjle push button MAN has been pressed The r elease ti s ingful only when the pro...

Page 12: ... function the release time is determined by the Densit y of the program i e by the relationship between the average to peak le el When the program is dense having a small dynamic range the releas time is made long Alternatively when t e peaks are much greater than the average level the release time is made short For high level program the el ase time of the expander function is made a function of ...

Page 13: ...s s 1 s IBUS TIN l ll When the button ATT s is pushed located at the left side of the middle series of buttons the instrument is operating on the upper scale In this mode the meter shows the number of times per second the limiter section has reduced the gain This shows the limiting in dB caused by the peak exceeding the threshold It is in general unreasonable to have the limiter function operate t...

Page 14: ...normal service the TEST mode should be checked every so often especially if there has been a large temperature transient B 5 PUSH BUTTON BYPASS When the button BYPASS is pushed the entire unit is bypassed so that the input or each channel is connected directly to the output without any electronic processing of the signal Turning the unit off auto matically activates the bypass mode A power failure...

Page 15: ...onnection of a second metering instrument For external metering for example in mixing console the second meter is connected in series with the inter nal instrument In this application the jumper between pins 1 and 4 is removed and the meter is inserted with the pole connected to pin 1 and the pole connected to pin 4 When the external instrument is removed the jumper between pins 1 and 4 must be re...

Page 16: ...oltage which deter mines the pulse duration modulation Since it is proportional to amplifi cation determined by the compressor section it is a measure of the average value of the program level in the compressor and limiter r egi on The voltage on pin 3 is the control voltage for the auto mat ic release time constant and is dependent on the cha racteristics of the program material Bot h signals on ...

Page 17: ...TIO of 2 5 l for the expander Adjust the expander rotation point grey wi h an input signal of noise alone without program The EXP ROT point is adjusted so that with the noise alone the meter gain shown on the meter is zero dB In this way when the program is no longer present the gain will return too dB unity the effective signal to noise ratio at the output of the compressor will be the same as th...

Page 18: ...he automatic release function lt should be remembered that the release function has as muc if not more effect on the nature of the compression than does the static characteristics A long release time results in an almost constant gain that is the short time dynamic range is unaffected and the system operates as an automatic volume control On the other hand with a short release time the gain is con...

Page 19: ...he correct operating functions and parameters been selected 3 Is the 5 pin shorting plug on the back of the unit firmly in position 4 Is the noise voltage at the output when pressing the TEST button no input voltage below 100 mV output transformer in 6 dB position If the noise voltage is much higher the four diodes Grl Gr4 or TS T6 in the multiplier may be defective D 1 1 MECHANICAL PREPARATIONS F...

Page 20: ...ssis parts of the unit are connected to the 0 V potential the 0 V clip of the test instrument can be attached to any part of the metal frame The 10 V potential can be picked up at the top of the powering printed circuit card at the nearest of the three l arge soldering lugs which lie side by side see photograph or be tter still it can be picked up at pin 2 red wire on the connector of the expander...

Page 21: ...on must not be put back into the compressor where it would be loaded by the printed circuit cards because the faulty printed circuit card would again damage the AC mains section On the contrary all printed circuit cards including the amplifier multiplier prints should be removed and tested for short circuits IMPORTANT If an ohmmeter is used great care must be taken to ensure that the internal test...

Page 22: ...eiste I lOV I top ov Now one printed circuit card after the other only one at a time is plugged into its appropriate place and the current consumption is measured Properly adjusted printed circuit cards should have the following current consumptions COMPR LIM EXPANDER INFORMATION BOARD MULTIPLIER AMPLIFIER The Power Supply will p r oduce with full load Voltage 27 mA 18 mA 30 mA 125 mA 180 mA appro...

Page 23: ...LIMITER 130ARD POWER SUPPLY Anordnung der Print Einschiibe Position of the Print Boards 0 Hi 1 3 1 0 J Ii Ii D 0 C Ii I 0 D rt t 0 rt 0 PdlJ S 1 Q 3 p D D Q Ii s p p D D 3 p p Ul Ul CO Ii J D D l 0 D rt O Ul 0 I 0 Ii rt Ul 0 0 O rt J D p Ii O D Ii I Ul J rt 0 D i p 0 0 Ii 0 rt C J D rt O 0 Ii p Ii p rt Ul D p ...

Page 24: ...erve correct polarity The DC supply should be continuously variable from 0 7 v The EXTERNAL DC input presents a load of 2 2 kOhm The variation of the pulse width as a function of the DC voltage may be observed by connecting an oscilloscope rise time 20 nanosec to the points 15 and 16 The illustration 4 shows the pulse width as a function of DC input voltage The amplitude of the pulses should lie b...

Page 25: ...on should be presse which feeds a 50 Hz half wave signal half way rectifier to the comparator This signal alters the gain 50 60 times per second from maximum to minimum The 50 Hz 60 Hz appears as noise signal at the output and is a measure of the unbalance of the push pull switching stage TS T6 T7 The BALANCE control should be adjusted for minimum noise voltage Values of 100 mv referred to a 6 dB ...

Page 26: ... voltage at Information Board of 0 6 V contact point 15 so that the pulse width of the output signal is barely affected R 130 Compressor attack time standard value 2 ms R 139 Adjust compression ratio to 4 1 R 141 Adjust so that OUTPUT remains constant when COMPR RATIO is varied rapidly R 152 Limiter threshold R 155 DC voltage adjustment for the points 25 and 26 R 168 Affects the DC voltages on the...

Page 27: ...ESGO 1 lltlflTER MONITOR 6 J 4A NOE R N OJl fM MI JLTIPLIVil R16B 2 SJ R201 2 50 II R 209 250 q 730 I R 152 R97 250 SK I _JI RtOS SK R74 R 50 RffB SK R 11 2 Soo R 28 101 c C c c c 1c cn mc z cn I I c s z c mcn Sze 1 1 n m I Cl c en m ...

Page 28: ...www SteamPoweredRadio Com ...

Page 29: ...2 15dB designed to work into a load of 200 Q or more Frequency Response referred to 1 kHz in the 30 Hz 10 kHz range 1 dB at 15 kHz 1 5 dB Total Harmonic Distortion at 1 kHz gain O dB unity intern level O dB less than 6 within operating range of compressor Release time autom controlled less than 6 within operating range of limiter Release time autom controlled less than 1 SI N Ratio Input terminate...

Page 30: ...matically controlled Expander Expansion Ratio selectable by push buttons Expander Rot Point adjustable Attack time Release time with a level decrease creating a 10 dB gain variation manually adjustable automatically controlled AC Mains Voltage ranges Frequency range Power consumption Weight referred to an internal level of 0 dB 40dB 2 dB 7 5 dB 24 dB 12 3 V max 100 µsec 25 2 5 sec program dependen...

Page 31: ...l IiIIIIIIIIiIIIIIIiIIIIi1 1 I I IE 11111 1111 1 I l 111 1 10 7Y 9 3 Y t 1 ov1 I 111 ME lOV HttJfHtU lOV l1 mvr 1 1 1 m lOVI I tt111 Ii 11 OkHt Signal zerhockt dutch 200kHt lmpulre 20kHz SIGNAL SAMPLED BY 200kHt PULSE 1ugehiiriger 200kHz lmpuls zum oberen Bild INGLE PULSE FROM ABOVE PICTURE lgentakt lrnpuls zum Bild CORRESPONDII PULSE Q TO PICTURE 200kHz Rechteckimpuls 200kHz SQUARE WAYE differenz...

Page 32: ...E DIFFERENTIATED SIGNAL 1 1v 1 2v 1 O sJf s uJ bti COMPRESSOR ROTATION POIIT ca DY AT COMPRESSOR ROTATION POINT APPROX OV 0 4Y 1 2V je nach Signal l O V Y DEPENDENT ON SIGNAL BY 9 7V 9 DV 3d8 ob1rhalb Limiter Eintab 3d8 OVER LIMITER THRESHOLD i _ __t jf 1 lOV 3d8 unterhalb Limiter Einaatz 3dB UNDER LIMITER THRESNDLD 1 J V K COMPRESSOR GAIN 18dB co 0 6V OdB ca 3 7V COMPRESSOR GAIN 18d8APPROX 0 6V 0...

Page 33: ...d entfallen ebenso Punkt B 2e 2 der Bedie nungsanle itung i I I U H 1 t 1 I CIM PI I t 1S I 1 U f I y ff e u NMtllNPIUSOI r I 1111 1 11 I I l 1J l CIMNI IATil I I W I tl II llll Fl Ml Hf I JIM tlll U w 1 0 MMU Compare d with the standard model EMT 156 the special model EMT 156 TV is a one channe l unit with no decay time setting controls The circuits concerned LIM RELEASE TI ME COMPR RELEASE TIME ...

Page 34: ...tlot8 l I 1 AUSG OUTPUT 2l h 21 I FUNCTIONi I 1 I 11 Im I I Ell iN FU NCTIO N N I t 11 L J l o II J ___1 s JI 119 E ll _ ffATIO A H 7 _ 1 J l l ll l 1 1A II OU71o Ol_ l h 9l 1 M t nl no Mt 1 C X t i t isc 1 11 11 m 11 21 2 rs 1 mm Cb A I 2 7 l 1 1 10 11 ua 11 AMPLIFIER AMPLIFIER l 1 3 liOII HI r II r IIU Cr_ Lt IIUI 1 0 1Sdt o Udll _ 0 lc 18 um 1 l 111 m 72 11 m Bt H8 m COM ON 1 rn c11 0 JpI MONIT...

Page 35: ...o Compressor Limiter 22 to Compressor Ll iter 21 MONITO R L 7 2 3 Monitor L 68n 100 1 i J 124 10V l2s 2k 2k 10V 10V 100 3 9k 15 17 13 18 3 9k 4 7k 16 100 68n 1 i 11 2k 2k Preemphasis 4 7k 20hp Filter 75 JS 3 9k 9 22 4 7k 4 7k 19 1 1 2 1 L_ __ _ fur 75µs Preemphasis for 75fJS Preemphasis Fur SOµs oder 90µs sind die 68 nF Kondensator en in 47 nF oder 82 nF zu andern For SOµs or 90µs change the 68 nF...

Page 36: ... 9 _ I C i __l JI __ cn J ill El 1 l 1 Cl lJ 1 Sn t Al 1k y n T CD C 4 al 1ill a oJl k T 7 n CD nn r 1 S k 4 7 I T3 T2 I J 1 iii J O l IMl 1 47 0 o I CD Rs Tr 1 f i i t 1J T 8 I I C92 47n EMT 156 APRIL 75 R Z 25k R 5 Sk Multiplier Board ...

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Page 38: ...www SteamPoweredRadio Com 1 p c 9 4 vt 0 I 1 t el ___ C 2 ta E I e C 1 l w ...

Page 39: ...www SteamPoweredRadio Com 0 EMT 156 R 219 47k c J C 96 3 3 H LM 301A C i O co r e 0 L J L J R 49 c J 4 7k R47 c J 4 7k R48 R46 c r c J 4 7 k 4 7k 0 4 OA 182 Gr 9 G e 8 Gr7 Gr6 Monit or Board ...

Page 40: ...www SteamPoweredRadio Com 0 EMT 156 0 1ei2e2ei1 12e 2eo 63 0 Monitor L Board ...

Page 41: ...www SteamPoweredRadio Com EMT 156 Compresso r Limiter Board Marz 76 ...

Page 42: ...www SteamPoweredRadio Com G tJ C w ...

Page 43: ...www SteamPoweredRadio Com 11s3 sat1 1111 p lso mro J1 0M R148 lp l 20k R 156 lp l 2 00 Gr SS lllit E C n 11 1fR P RP E E a a R P o mD r RSl lp 1100 R90 1M EMT 156 Pot enti ome ter Boa rd MAI 70 ...

Page 44: ...dio Com R151 10 K R93 10 K Meter Board EMT 156 MAI 70 Function Selector Board 7 I I I I _J RATIO 2 5 RAm 5 EXP ON COMPR Ill UM ON ill m so il Lmo l J 470 r 7 I I I I FUNCTION TEST AUX DC BYPASS A TT s 680K AUTO MAN 7 I I ...

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