Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Suresh R
03/22/06 05:24
Read: 1542 times
Chennai
India


 
#112768 - Measuring CR of Reed Switches.
Hello Everyone,
I need to develop a circuit to measure the contact Resistance of Reed switches.
The Test current should be 10mA and 100mA
The Test Voltage should be from 10mV to 2500V (variable)
This is the spec available for the existing one (its an addon card).
i would like to do a new one that could give the Test current and Test Voltage as mentioned above.

i came accross the Kelvin four wire method as a suitable option to measure the contact resistance. But not sure of the supporting circuit, that could achieve the above rating.

So, i would be happy if anyone could guide me with some suggestions in developing the circuit.

Suggestions on alternate methods for measurement of CR will also prove to be useful.

Thanking you all,
suresh.




List of 42 messages in thread
TopicAuthorDate
Measuring CR of Reed Switches.      Suresh R      03/22/06 05:24      
   Contact resistance?      Oliver Sedlacek      03/22/06 06:41      
   Correction : Sorry its 10mV to 2500mV      Suresh R      03/22/06 08:17      
   Voltage or current, pick one      Oliver Sedlacek      03/23/06 02:12      
      I can choose Test current as 10mA      Suresh R      03/23/06 03:09      
         typical constact resistance ?      Steve M. Taylor      03/23/06 05:38      
      yes, but      Erik Malund      03/23/06 06:52      
         No CR when closed?      Suresh R      03/23/06 09:46      
            If this was possible, you would not need      Erik Malund      03/23/06 10:37      
               current source with series resistor at      Suresh R      03/23/06 11:22      
                  Yes      Erik Malund      03/23/06 11:48      
                  constant current source      Terry Lingle      03/23/06 13:18      
                  V=IR      Neil Kurzman      03/23/06 15:10      
                     Specs & Description      Suresh R      03/24/06 04:47      
                  resistor ?      Steve M. Taylor      03/24/06 01:45      
                     Current source circuit for CR measuremen      Suresh R      03/24/06 10:06      
                        Why not using...      Kai Klaas      03/24/06 10:35      
                        Kind of      Neil Kurzman      03/24/06 18:06      
                           And...      Kai Klaas      03/24/06 20:38      
                              7805 and get 10mA and 100mA      Suresh R      03/25/06 04:48      
                              reply - thermo-potentials      Suresh R      03/26/06 03:39      
                                 since you work for the manufacturer      Erik Malund      03/26/06 10:50      
                                 Chopper      Kai Klaas      03/26/06 20:04      
                                    Chopper schematic      Kai Klaas      03/27/06 05:58      
                                       Thanks very much Kai.      Suresh R      03/27/06 10:35      
                                       Reply : Chopper Schematic      Suresh R      03/28/06 11:36      
                                          Answers        Kai Klaas      03/28/06 19:58      
                                             what about a chopper stabilized op-amp?      Erik Malund      03/29/06 06:14      
                                                Yur.      Steve M. Taylor      03/29/06 07:22      
                                                Yes, but...      Kai Klaas      03/29/06 08:36      
                                             AC components , VCR, DCR      Suresh R      03/29/06 11:59      
                                                Answers      Kai Klaas      03/29/06 20:18      
                                                   Demodulation?      Oliver Sedlacek      03/30/06 01:06      
                                                      This would be the Lock-in scheme      Kai Klaas      03/30/06 05:35      
                                                   Average Value, VCR & DCR Calculation      Suresh R      03/30/06 05:30      
                                                      Quite simple      Kai Klaas      03/30/06 05:45      
                                             Analysis for Usig o/p      Suresh R      03/30/06 11:56      
                                                Answers      Kai Klaas      03/30/06 20:33      
                                                   I thank you very much Kai      Suresh R      03/31/06 04:48      
                                                      Test Condition: 10mA, 50mV      Suresh R      04/19/06 10:06      
                                                         Switching condition      Kai Klaas      04/19/06 10:14      
   Remember Ohm's law?      Richard Erlacher      03/23/06 12:50      

Back to Subject List