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Line In Flat Response Mode: 

On the top of the unit is a new feature, audio dBV 
level. The readings and the display help determine 
what level of signal is Coming from the house feed. 
Levels between -10dBV and +4dBV are considered 
to be line level signals. Often a poor loop system 
Sound comes from a very low level facility feed. 
This input uses the last mode on the FSM and dis-
plays an accurate level which can then be demon-
strated to the facility. We prefer a level between -
10dBV and 0dBV. 

To use this feature cycle through the various mode 
until you see Line In Flat Response on the display. 

Now connect up the XLR adapter which has an 

XLR female on one end and an 1/8” TRS connector 
on the other end. If you wish to make up your own 
adapter use the following information. 

 

 

   

1/8 in TRS connector                 XLR female connector 

               Tip  ---------------------------------------------  Pin 2 

                Ring  ------------------------------------------  Pin 3 

                Sleeve ----------------------------------------  Pin 1 

 

Meter Operation Basics 

Turning the meter ON and Off 
On -   Press and hold button A until the screen lights 
Off  -   Press and continue to hold button “A” until the Powering 
 

Down process is finished and the screen goes dark 

Selecting the meter mode 
  

When you press Button “A” it first displays the current mode 

and the next press advances to the next meter mode: 
1.   

Background Noise Test with Max indication 

2.   

Signal Strength  “A weighted” RMS / Peak 

3.   

Field Strength  “Flat” RMS / Max 

4.   

Third Octave Levels 100, 200, 500, 1K, 2.5K, 5KHz 

 

 

 

B” Button functions 

 

 

In modes  1  -  3 pressing the “B” button reset the    

 

MAX or PEAK readings 

 

 

In mode 4  pressing the “B” button advances the  

 

 

center frequency of the third octave filters 

Sensor Location 

Button “A” On/Off and Mode con-
trol 

Button “B”  Reset/Select and Fre-
quency advance 

 

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Summary of Contents for Loop-FSM

Page 1: ...Model LOOP FSM User Manual Audio Frequency Induction Loop Field Strength Meter ...

Page 2: ...ion 0 1dB resolution for levels over 32dB Displayed resolution 0 1 dB Detection Type True RMS on all features Sensor Pickup Coil Direction of Sensitivity Length wise of meter s longer dimension and Parallel to meter face Position noted on Product Calibration Calibrated at 1 000 Hz sine to read 0 dB at 5 03 mG Frequency Response Flat 1dB from 50 Hz to 10 000 Hz A Weighted Class 2 meter specified in...

Page 3: ...p your own adapter use the following information 1 8 in TRS connector XLR female connector Tip Pin 2 Ring Pin 3 Sleeve Pin 1 3 Meter Operation Basics Turning the meter ON and Off On Press and hold button A until the screen lights Off Press and continue to hold button A until the Powering Down process is finished and the screen goes dark Selecting the meter mode When you press Button A it first dis...

Page 4: ...k noise signal Cont Record the RMS level readings for each of the frequencies As in method I if the level does not vary by more than 3dB the sys tem as installed will meet the IEC specification This method was requested by the field engineer so they could run the test with one instrument without continually adjusting the frequency source It also makes it easy to conduct the test in more than one l...

Page 5: ...o set the field strength to an average of 12dBA as it will constantly vary based on the program used to set up the system We will use the PEAK read ing to confirm that both our design and equipment meet the IEC specification Pressing button B resets the PEAK reading How to test then adjust the loop system level Once the hearing loop system has been installed play some bandwidth limited 100Hz to 5K...

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