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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

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

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

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.

"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.


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