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???
03/24/06 17:35
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 		 #113002 - Why not using...
Responding to: ???'s previous message
Why not using a simple 1k5 resistor for the 10mA constant current and a 150R resistor for the 100mA constant current, both in combination with +15V voltage source? Even with a 2Ohm contact resistance this would result in an error of only 1.3%, if remaining uncorrected.

Kai

List of 42 messages in thread
TopicAuthorDate
Measuring CR of Reed Switches.            01/01/70 00:00      
   Contact resistance?            01/01/70 00:00      
   Correction : Sorry its 10mV to 2500mV            01/01/70 00:00      
   Voltage or current, pick one            01/01/70 00:00      
      I can choose Test current as 10mA            01/01/70 00:00      
         typical constact resistance ?            01/01/70 00:00      
      yes, but            01/01/70 00:00      
         No CR when closed?            01/01/70 00:00      
            If this was possible, you would not need            01/01/70 00:00      
               current source with series resistor at            01/01/70 00:00      
                  Yes            01/01/70 00:00      
                  constant current source            01/01/70 00:00      
                  V=IR            01/01/70 00:00      
                     Specs & Description            01/01/70 00:00      
                  resistor ?            01/01/70 00:00      
                     Current source circuit for CR measuremen            01/01/70 00:00      
                        Why not using...            01/01/70 00:00      
                        Kind of            01/01/70 00:00      
                           And...            01/01/70 00:00      
                              7805 and get 10mA and 100mA            01/01/70 00:00      
                              reply - thermo-potentials            01/01/70 00:00      
                                 since you work for the manufacturer            01/01/70 00:00      
                                 Chopper            01/01/70 00:00      
                                    Chopper schematic            01/01/70 00:00      
                                       Thanks very much Kai.            01/01/70 00:00      
                                       Reply : Chopper Schematic            01/01/70 00:00      
                                          Answers            01/01/70 00:00      
                                             what about a chopper stabilized op-amp?            01/01/70 00:00      
                                                Yur.            01/01/70 00:00      
                                                Yes, but...            01/01/70 00:00      
                                             AC components , VCR, DCR            01/01/70 00:00      
                                                Answers            01/01/70 00:00      
                                                   Demodulation?            01/01/70 00:00      
                                                      This would be the Lock-in scheme            01/01/70 00:00      
                                                   Average Value, VCR & DCR Calculation            01/01/70 00:00      
                                                      Quite simple            01/01/70 00:00      
                                             Analysis for Usig o/p            01/01/70 00:00      
                                                Answers            01/01/70 00:00      
                                                   I thank you very much Kai            01/01/70 00:00      
                                                      Test Condition: 10mA, 50mV            01/01/70 00:00      
                                                         Switching condition            01/01/70 00:00      
   Remember Ohm's law?            01/01/70 00:00      

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