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probe01 (Electrical) (OP)
16 Mar 11 8:21
can some body tell me what is use of null meter in synchronisation and what it ment for?
rbulsara (Electrical)
16 Mar 11 9:13
Look up "Synchroscope" on Google or Wikipedia.

Rafiq Bulsara
http://www.srengineersct.com

probe01 (Electrical) (OP)
16 Mar 11 10:51
well i had tried but synchroscope and null meter is different
rbulsara (Electrical)
16 Mar 11 11:35
Not familiar with that term/meter in synchronizing application.  A null meter that is used for resistance testing has no direct use there. Describe the null meter your know about.
 

Rafiq Bulsara
http://www.srengineersct.com

dpc (Electrical)
16 Mar 11 11:47
Perhaps something related to voltage matching of generator voltage and line voltage, but I've never come across this terminology in a synchronizing system.  

David Castor
www.cvoes.com

byrdj (Mechanical)
16 Mar 11 19:59
would it be similair to using lamps to indicate when the incoming and generator are inphase
GTstartup (Electrical)
17 Mar 11 1:57
My understanding of a null meter is that it is used to indicate the balance between an AVR auto and field current channel, not directly related to synchronizing
waross (Electrical)
17 Mar 11 2:18
I thought that a null meter was used to synchronize aircraft engines or boat engines to eliminate the beat frequency of small speed differences.

Bill
--------------------
"Why not the best?"
Jimmy Carter

ScottyUK (Electrical)
17 Mar 11 9:29
I agree with GTstartup, it is a term sometimes seen when multiple controllers are tracking each other in an AVR, typically the main and standby auto systems and the manual controller. It's purpose is to aid a bumpless transfer between sources, i.e. if the null meter isn't zero there will be a definite 'bump'.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

pwrengrds (Electrical)
17 Mar 11 14:26
The null meters I have seen are used to switch modes of operation in the AVR, from Auto to Manual, Manual to Auto.

Its generally not used to sync.

David

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