mchpddl1
Newbie level 6
Dear all, i have a question regarding TTL triggering.
I have two instruments, where one is a TTL output (pin 3, on a 15 pins connector) of a GSM call tester and it is used to trigger another instrument at the GATE INPUT (BNC connector) of a spectrum analyser. It seems that i can use a thin wire, connect pin 3 of the call tester directly to the BNC centre conductor of the spectrum analyser without grounding on the wire between the 2 instruments and works perfectly fine without the grounding, can anyone explain to me why it still works even grounding does not exist in such a connection? I look forward to hearing from yo, thanks......
I have two instruments, where one is a TTL output (pin 3, on a 15 pins connector) of a GSM call tester and it is used to trigger another instrument at the GATE INPUT (BNC connector) of a spectrum analyser. It seems that i can use a thin wire, connect pin 3 of the call tester directly to the BNC centre conductor of the spectrum analyser without grounding on the wire between the 2 instruments and works perfectly fine without the grounding, can anyone explain to me why it still works even grounding does not exist in such a connection? I look forward to hearing from yo, thanks......