Besantek BST-GFL31, User Manual, Page: 17 / 33

BST-GFL31 User Manual
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synchronization” for setting instruction.
2.5.2 Set Signal Reference
After signal receiver is connected well with current detector, turn on the receiver and select “Ground
Fault”. You will see the screen for frequency setting as below:
Fig 2.5.2.1 Fig 2.5.2.2
After frequency synchronization, receiving frequency 10Hz is kept unchanged. Volume setting has
option from 0 to 9. For example, if setting volume is 4, when detected signal is higher than 40%, signal
receiver will BEEP. Screenshot like below (Fig 2.5.2.3) indicates 40% signal strength.

Signal Reference Setting
This is very important step for BST-GFL31 during ground fault location.
After initial setting for receiving frequency and audio, click OK to proceed in the screen like Fig 2.5.2.3.
Before reference setting, signal strength in the screen can be any number.
Fig 2.5.2.3
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What is reference setting?
When the signal generator injects a current signal into the DC circuit, this current signal can go
anywhere and finally outflow to the point of fault. Since there are too many branches and sub-branches
in real DC system, the signal will become weaker and weaker, which will make it very difficult to trace.
To make signal tracing easier, we use the term of “Signal Reference”. It will help compare different
signals more effectively to sort out the real fault.
At the start of the circuit (output of signal generator), set the reference point as 100% signal strength.