Трансформатор LUNDAHL LL1581XL. Инструкция на английском языке

Tibeliusgatan 7                        International    Domestic
S-761 50 NORRTALJE          Phone    +46 - 176 13930   0176-13930
SWEDEN                      Fax      +46 - 176 13935   0176-13935
LL1581XL
Splitting Transformer
In many splitting applications, the splitting transformer must have a high immunity to input common mode signals, to
stray magnetic fields from e.g. power transformers and to large ground potential differences in receiving systems.
The LL1581XL is developed to handle those types of problems. When designing the LL1581, we have used our well
established two coil structure to create a transformer with a high degree of symmetry. The transformer is built up from
two primary windings  (which should be used in parallel) and two secondary windings. Each secondary winding is built
up from two sections, one from each coil. Its own electrostatic shields surround each secondary section. The symmetric
structure results in an internal cancellation of noise signals caused by external magnetic field. It also increase immunity
to ground noise between secondary systems and reduces the effects of input common mode signals.
The transformer is housed in a mu-metal can and is impregnated in solventless epoxy resin.
Turns ratio:                                             1 + 1 : 1 + 1
Pin layout (viewed from component side) and simplified winding schematics:
E 2 (+ core)
4                   8
4              8
E2
3              7            3                   7
LL1581
2    (top view)   6         1                   5
E1
1              5
2                   6
E 1 (+ can)
Spacing between          Spacing between     Offset of earth pins from    Recommended
pins                       rows of pins           adjacent row:         PCB hole diameter:
5.08 mm  (0.2")       27.94 mm  (1.1")         2.54 mm (0.1")             1.5 mm
Dimensions (Max. L x W x H above PCB(mm))                        38 x 24 x 20.5
Weight:                                                          61 g
Static resistance of each primary:                               61 W
Static resistance of each secondary  (Pins 5 - 6 and pins 7 to 8):  51 and 71 W
Self resonance point :                                           > 200 kHz
Distortion                                                       0.1% @ +3 dBU,  50 Hz
1  % < @ +13 dBU, 50 Hz
Frequency response (Ref : -6 dBu, 1kHz)                          10 Hz -- 100 kHz +/- 0.5 dB
Test arrangement: Parallel input - parallel output . Source 150W  , load 10 kW
CMRR  at 20 kHz  (Source 600 ohms, load 2 x 10k)                 > 60 dB
CMRR at 20 kHz from sec. to sec.  (Source 600 ohms, load 2 x 10k)  > 40 dB
Isolation test  primary - secondary  / secondary - secondary / E1 - E2  4 kV / 2 kV / 1 kV  RMS
Application example. Component side view.
Splitting 1: 1 + 1
Primary signal from
microphone cable, with or
without phantom power.               4             8    +
E2
3             7
2             6
E1
1             5
+                           +
Secondaries can be connected individually.
(Function does not require that both
secondaries are connected/used)
R990105
LL1581XL
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LL1581XL application example.
1 + 2 Out Splitting box                        Front house
desk.
With phantom
On stage mic.
power supply
1
2
3
Before connecting  splitting box
With splitting box
Front house desk.
With phantom
power supply
On stage mic.
1
2
3
Direct output
3   2   1     1   2   3
Splitting box
1     2        3     4
LL1581X
5  6   E1      E2  7   8
SW1
SW2
3   2   1      1   2   3
Monitor                                                                              Recording
Desk      3                                                                        3  Truck
2                                                                        2
1                                                                        1
Ideally, SW1 and SW2 should be open.
Close SW1 and / or SW2 when E1 and / or E2 do not receive ground
reference from Monitor desk or from Recording truck respectively.       R990308
LL1581XL
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