DIN-LOF Line output isolator

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The Iso•Max DIN-LOF is a single channel output isolator for both balanced and unbalanced signals where extreme signal handling is required to drive long cable runs.

  • Drives balanced and unbalanced signals long distances
  • Eliminates hum and buzz caused by ground loops
  • Withstands input levels in excess of +21 dB at 20 Hz
  • Easy to use DIN rail format for quick installations

The design begins with a gray molded assembly made from UL94-VO flame retardant Noryl that snaps into place onto a standard 35 mm DIN rail for easy installation in a NEMA enclosure. Connections to and from the module are made via removable screw-down wire terminals. Plug and play easy to use, this passive interface does not require any power to work. Inside is a high performance nickel core Jensen transformer that is able to withstand signals in excess of +21 dBu without discernible distortion while delivering a linear response to 10 Hz to 50 kHz. This provides galvanic isolation between the input and output to eliminate hum and buzz caused by ground loops, rejecting noise by as much as 94 dB. To further optimize performance, a choice of connection point options enable the user to determine the most appropriate grounding scheme to suit the installation.

These features make the Iso•Max DIN-LOF a superb choice for the most demanding broadcast, AV and performance venue installations.

Applications

DIN-LOF with a PA system

Eliminating noise in a PA system can sometimes take hours of trouble shooting, particularly when the mixer, amplifiers and speakers are distanced apart. Simply connect the DIN-LOF at the output of your mixer to instantly eliminate ground loop hum and buzz.

Isolating two consoles

Whether you are isolating two consoles in a festival or experiencing noise when connecting to a drive rack, the DIN-LOF is easily inserted into the signal chain to break the ground loop and eliminate noise as it easily handles huge bass transients without distortion.

DIN-LOF in the studio

Recording and broadcast studios require a noise-free signal transfer while delivering the most accurate sound possible. The Iso•Max DIN-LOF eliminates ground loops without introducing distortion, phase shift or artifact.

Specifications

All levels are output unless noted

PARAMETER CONDITIONS MINIMUM TYPICAL MAXIMUM
Input impedance, Zi 20 Hz to 20 kHz, 0 dBu, test circuit 3 705 Ω 716 Ω 725 Ω
Voltage gain 1 kHz, 0 dBu, test circuit 1, Rs = 0 Ω -1.8 dB -1.6 dB -1.4 dB
Magnitude response, ref 1 kHz 20 Hz, 0 dBu, test circuit 1, Rs = 0 Ω -0.10 dB -0.03 dB ±0.0 dB
Magnitude response, ref 1 kHz 20 kHz, 0 dBu, test circuit 1, Rs = 0 Ω -0.10 dB ±0.00 dB +0.10 dB
Deviation from linear phase (DLP) 20 Hz to 20 kHz, 0 dBu, test circuit 1, Rs = 0 Ω   +0.3/-0° ±1.0°
Bandwidth LF -3 dB re 1 kHz, test circuit 1, Rs = 0 Ω   0.20 Hz  
Bandwidth HF -3 dB re 1 kHz, test circuit 1, Rs = 0 Ω   15 MHz  
Distortion (THD) 1 kHz, +4 dBu, test circuit 1, Rs = 0 Ω   <0.001%  
Distortion (THD) 20 Hz, +4 dBu, test circuit 1, Rs = 0 Ω   0.035% 0.15%
Maximum output level 20 Hz, 1% THD, test circuit 1, Rs = 0 Ω +19 dBu +21 dBu  
Common-mode rejection ratio(CMRR) 60 Hz, test circuit 2   94 dB  
Common-mode rejection ratio(CMRR) 3 kHz, test circuit 2 75 dB 83 dB  
Output impedance, Zo 20 Hz to 20 kHz, 0 dBu, test circuit 4   116 Ω  
Turns ratio   0.999:1 1.000:1 1.001:1
Optimal cable length input   50 m (165’) 200 m (650’)
Optimal cable length output   No limitations
Temperature range operation or storage 0°C   70°C
Breakdown voltages 60 Hz, 1 minute test duration* winding to winding 250 V RMS    
  winding to frame 500 V RMS    

Graphs

Phase Distortion (DLP)
Frequency Response
THD vs Level at Low Frequencies
THD vs Frequency at Various Levels
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