EMT_140_with schematics(A)电路图.pdf

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1、Contents Page Hints for unpacking and transporting 1 Small parts A Preparing the unit for operation A 1 Opening of the unit and removal of the transit protections 3 A 2 Preparatory work on the unit 3 A 3 Mains connections 5 A 4 Earthing 6 A 5 Connecting the signal lines 7 A 6 Fitting and connecting

2、of the accessories for remote 7 A 7 Calibration of Reverberation Time Indication. 8 A 8 Test tape 8 B Electrical tests and adjustments after initial installation B 1 Setting up the amplifier gain without reverberation plate 9 B 2 Adjusting the overall gain via the reverberation plate 9 B 3 Frequency

3、 response measurements 10 C Connecting the reverberation unit into the signal path C 1 Basic principles 11 C 2 Stereo / Mono operation 11 D Practical operating hints D 1 Units without remote control 12 D 2 Units with remote control 12 D 3 Bass cut at the amplifier 13 Technical data EMT 140 FB-TS 14

4、Technical data EMT 162 TS 15 a Free Download from AnalogR RadioFans.CN 收音机爱 好者资料库 Outline size 17 Circuit diagram. EMT 140 FB-TS EMT 162 TS front view 19 EMT 162 TS rear view 20 EMT 162 TS with open lid 21 Circuit diagram EMT 162 TS 22 Adjustments and test points EMT 162 TS 23 Print board EMT 162 TS

5、 24 Frequency responses EMT 162 TS 25 Tolerance field EMT 140 TS 26 Connection diagram for reverberation generation 27 Circuit diagram for multiple control desk arrangements 28 Spare parts 29 Service Instructions 30 EMT 140 Q 33 a Free Download from AnalogR RadioFans.CN 收音机爱 好者资料库 Small parts EMT 14

6、0 TS Reverberation Unit: 1 Hand wheel, complete 1 Plastic disk 2 open-end wrenches 8 Wire Clips 2 Clip guards 2 Plugs T 3084-2 or: 2 Plugs Cannon XLR-12c 2 Plugs Cannon XLR-13c 1 Power cord (US-version) 1 Power plug* 1 Driver magnet, complete EMT 140 F Remote control Motor unit: 1 Fuse 1 A slow-blow

7、 20 mm x 5 mm 0 1 Fuse 1 A slow-blow 1 1/4 x 1/4 1 Plug T 3055 1 Coupling disk (plastic) 1 Screw cap (US-version) EMT 140 B Remote Control Operating Unit: 1 Bulb socket 1 Bulb 24 V/80 mV 1 cap with lens 1 Resistor 2000 ohms 0.25 W 5 % 1 Condenser 0.1/uF 400 V 1 Toggle switch 2 Fuses 0.5 A, 20 mm x 5

8、 mm 1 Screw cap (Europe version) 1 Fuse holder 2 Fuses 0.5 A, 1 1/4 x 1/4 1 Screw cap (US-version) a Free Download from AnalogR RadioFans.CN 收音机爱 好者资料库 Please read Carefully before unpacking Hints for unpacking and transporting: 1. The equipment should only be moved short distances after being unpac

9、ked. 2. Make sure the case is standing the right way up. The arrows must point upwards. 3. The front of the case should be opened first. Remove nails carefully. Do not use crowbars or levers. 4. The sketch on the front of the Reverberation Unit shows how if should be lifted from the base of the pack

10、ing case and moved to its destination. During transport the dial indicating reverberation time must be at the fop. The equipment should only be moved in an upright position. 5. Only when standing at ifs final destination should the Reverberation Unit be made ready for operation. 6. Before opening th

11、e equipment if is essential that the operating instructions are studied carefully. a Free Download from AnalogR A. Preparing the unit for operation The reverberation unit EDIT 140 is a high precision electroacoustic device requiring particular protec tion during transit. Only when the unit has been

12、unpacked and placed in its final location should the pro tecting devices be removed and the unit prepared for operation. A1 OPENING OF THE UNIT AND REMOVAL OF THE SHIPPING PROTECTIONS 1. First unscrew the two side-plates, then the top cover-plate (the two end-plates and the base-plate should be left

13、 on). 2. Untie the two cartons with accessories from the base-plate and remove them. Remove the card board pieces between the reverberation plate and the traverse units. Untie the moving parts of the damp ing plate. When packed for airfreight, the foam rubber strips between steel-plate and damping p

14、late have to be removed. 3. Untie the shielded cables (with Co-ax plug) from the traverse and plug into the amplifier input sockets. Plug colored Co-ax plug into left-hand channel. A2 PREPARATORY WORK ON THE UNIT The various sections should be prepared for operation as follows: 1. The reverberation

15、plate (large steel sheet) It is held in the tubular frame by means of two steel clips on each side - i.e. 8 altogether - (spare steel clips are provided) which are attached to threaded bolts. The reverberation plate can be tensioned in the frame by means of the nuts on these bolts. a Free Download f

16、rom AnalogR Before shipment four of these nuts (see drawing) have been loosened at the factory by exactly a quarter of a turn (900) counter-clockwise. Therefore, the standard practice is to tighten the plate by means of the same screws exactly 90* clockwise. However, this applies only if no stressin

17、g of the steel clips occurred during transport - which may be caused by shocks etc. In this case, more tension is necessary to obtain the original state. In case of doubt we strictly recommend to have the plate more stressed instead of having it too loose. With too high tension most probably the fre

18、quency response will run out of the tolerance field (too low at bass end), but in the same way distortion with low frequencies will be reduced. In order to vary the tension of the plate, proceed as follows: The inner nuts must be held in position (they must not be allowed to turn) while loosening th

19、e outer lock nuts. The inner nut should now be turned. It should be then held in this position while tightening up the lock nut. The only criterion for correct tensioning are the electroacoustic properties (check of overall response see B 3). If a re-tensioning of the steel-plate is neccessary (e.g.

20、 because a spring has been broken during transport) please refer to B 3, Frequency response measurements (T - 2 S). After tensioning, the top cover-plate of the wooden housing should be replaced. 2. The damping plate Its distance from the reverberation plate can be varied by means of the parallel gu

21、ide mechanism (adjustment of reverberation time). The damping plate is adjusted at the factory so as to achieve - with the damping plate turned in - the smallest defined reverberation time (equal to or less than 1 s). The hand wheel, which is supplied separately, is for adjusting the reverberation t

22、ime. It is pushed through the plate with the scale marking on the top of the unit onto the shaft which operates the lever mechanism of the damping plate. Before fixing the hand wheel on this shaft one should ascertain that the pointer is within the scale. a Free Download from AnalogR In units withou

23、t internal remote control the damping plate should be easily movable by turning the hand wheel. With minimum reverberation time the damping plate must not touch the steel plate. This applies to units with remote control as well. 3. The driving system The black enamelled mounting-plate around the mov

24、ing coil is for mounting and adjusting the driver magnet system which is supplied separately. The mounting plate is fixed to the central traverse by means of four screws. It can be adjusted by loosening these screws. By means of the plastic plate which is provided, the concentricity of the magnet an

25、d the moving coil may be checked after tensioning the reverberation plate. If the systems are concentric the plastic adjusting plate can be pushed easily onto the moving coil and inserted into-the four guides for the mounting plate. The driver magnet system should-then be pushed carefully over the m

26、oving coil without brushing against it and screwed to the mounting plate. The DC resistance of the moving coil is 12.5 ohms. 4. The pick-up systems All versions of the EMT Reverberation Unit are equipped with two pick-up systems. They are accessible on the two outer traverses and are protected by a

27、shielding can. By opening the lid of these cans, it is possible to ascertain that: The microphone system (capacity approximately 500 pF) is able to move freely inside the can and the leads to the soldering lugs are also free. Replace the lid of the can. Then screw on the two wooden side-covers again

28、 and fix the top cover. Now the preparation has been finished. The EMT-Reverberation Unit is protected against ambient noise by rubber suspension blocks between case and frame. However, with excessive ambient noise, additional suspension of the total unit is advisable. A3 POWER CONNECTIONS A three-c

29、onductor cable may be attached to the AC connector which is provided. The EMT Reverberation Unit will be set at the factory to the AC voltage quoted in the order. This voltage is entered in the delivery papers. If no definite voltage was decided upon when ordering, the unit will be supplied with the

30、 AC voltage set to 220 V/50 Hz. The units EMT 140 FB and EMT 140 FBst (with internal remote control) which are supplied for AC voltage of 110 V, 117 V, or 240 V are equipped with an additional transformer S 140- B which will be set at the factory to the -required AC voltage. Instructions for changin

31、g the primary voltage on the additional transformer are contained in the drawing S 140-232.B at the end of this operating manual. IMPORTANT a Free Download from AnalogR The amplifier has to be set separately to the actual AC power voltage. The respective current of the fuse should be observed. The s

32、etting is done by means of the slide switch (100 V - 130 V and 190 V - 260 V) at the rear of the amp1ifier. If a reverberation unit EMT 140 or EMT 140 st which is operated from an AC voltage other than 220 V is to be equipped subsequently with the internal remote control outfit EMT-140 F, an additio

33、nal transformer S 140-232 W must be used. (Please note this when ordering.) A4 OPERATING GROUND, AC GROUND, CHASSIS, ZERO-VOLT (MINUS) In order to comply with the requirements of the numerous Safety Authorities, the following connections are available: AC ground: Connection via power cord. External

34、ground: Connection to screw on front panel. Zero-volt/AC ground: This connection is accessible on the print (covered by a plastic shield) inside the unit. In the amplifier EMT 162 TS, the following connections are available: AC ground / Chassis: At the rear of amplifier. Zero-volt / Chassis Soldered

35、 connection inside the amplifier A5 CONNECTING THE SIGNAL a Free Download from AnalogR LINES The connectors which are provided should be connected to the incoming and outgoing signal leads in accordance with the test circuit EMT 140 FB-TS. A6 INSTALLING AND CONNECTING THE ACCESSORIES FOR INTERNAL RE

36、MOTE CONTROL On the units EMT 140 FB-TS the reverberation time can be varied by means of a remote control unit from the mixer. For this purpose the remote control unit EMT 140 B which is supplied, the toggle-switch with its accessories and the pilot lamp should be built into the mixer. The reverbera

37、tion time can be varied at any time on the unit itself - e.g. for testing - by means of the switch on the connecting plate (+ increase, - decrease reverberation time). The control unit EMT 140 B should be connected in accordance with the circuit diagram EMT 140 FB-TS via an 8-conductor cable and by

38、means of the 8-pole TUCHEL connector T 3055/10 which is provided with the reverberation unit. By means of the toggleswitch, the entire reverberation unit can be remotely switched on and off from the mixer. The AC switch on the amplifier must in this case be permanently left in the ON position. The p

39、ilot lamp on the mixer will light up when the unit is switched on. For testing purposes the unit may be switched on directly (by means of the switch on the mains plate of the unit) independently of the AC switch on the mixer. However, the pilot lamp on the mixer will not light up in this case. The r

40、emote control requires an operating voltage of 24 V DC. If a unit is ordered for other control supply voltages, this will be specially noted in the delivery papers. a Free Download from AnalogR The drawing sheet X 140-20 shows a circuit arrangement whereby one reverberation unit may be remote contro

41、lled from several mixers. It is for instance, possible to connect three indicators for the reverberation time in series without re-calibrating them. The circuit connections to the control terminals 1 and 2 of the 8-pole TUCHEL connector from several mixers can be effected by means of standard techni

42、ques i.e. with plugs, relay circuits or even selector circuits. It is only necessary to ensure that one control circuit cannot contact more than one control unit at a time. A7 ADJUSTMENT OF REVERBERATION TIME INDICATION It may be advisable to check to Reverberation Time Indication on the meter. Cali

43、bration at 1 s is done by means of R and at 2 s by R 3 respectively. These potentiometers are accessible through the cover of the motor unit. A8 TEST TAPE Tape Speed 15 ips. Equalization according to CCIR. For testing the frequency response and adjusting the overall gain via the reverberation-plate

44、EMT 140, a test tape is available, which replaces the use of a noise generator and band pass filter and also simplifies the test methods. The followings signals are recorded on this tape: 1. Level for adjusting the gain. Announcement in German. 1/3 octave band noise,mid-frequency 1kHz; peak level, r

45、unning time approx. 2 minutes. Yellow leader tape. 2. Frequency response. Announcement in German. 1/3 octave band noise. 27 mid-frequencies from 40 Hz to 12.5 kHz each frequency with announcement in German (running time of each frequency 20 seconds), 14 dB below peak level. a Free Download from Anal

46、ogR B Electrical tests and adjustments after initial installation B1 SETTING UP THE AMPLIFIER GAIN WITHOUT REVERBERATION PLATE The amplifiers are pre-aligned at the factory. The gain controls are accessible by removing the amplifier cover plate on the front end of the reverberation unit (2 knurled s

47、crews). The positions of the potentiometers are shown on the inside of the amplifier cover plate and on the drawing Adjustment and Test points. The drive level is to be set on R 17. Feed a third octave 1 kHz center frequency white noise spectrum to one of the units inputs at a level reading .On on a VU meter or -6 W on a Peak Program meter connected to it. Such a meter for constant program feed supervision must be permanently connected to the input of the EMT unit. Adjust the drive level control until a VTVM connected to the test jacks on the amplifier, which are connected to the drive ou