I've been using a solder-on DB9 connector to connect four resistive measurement devices to 4 female BNC connectors en route to a Wheatstone bridge circuit. For the second time now I've damaged one of my resistive devices, and upon further investigation, have found that the DB9 connector (even after it's been completely removed from the circuit) has a negative resistance and between 100-300mV between two of the pins. There should normally only be about 500mV going through the circuit when it's powered on.
What could possibly cause this issue? Could a spike in voltage damage the connector and leave it with a capacitance or something?
For the record, I'm a Mech Eng by training, so I have only a general understanding of the circuitry.
Thanks in advance for your help.
What could possibly cause this issue? Could a spike in voltage damage the connector and leave it with a capacitance or something?
For the record, I'm a Mech Eng by training, so I have only a general understanding of the circuitry.
Thanks in advance for your help.