Produce of series type Ohmmeter using PMMC of Ifsd:100uA for range of 0-20kohm?
aku pon tatau
A cappella
Lute
Laboratory analytical instruments manufactured by this industry were used to conduct physical and chemical analyses.
it is part of the sex instruments
Permanent magnet moving coil (PMMC) instruments use a moving coil that is suspended between the poles of a permanent magnet, whereas moving iron instruments use a stationary coil and a moving iron piece that moves within the coil's magnetic field. PMMC instruments are more accurate but have limited range, while moving iron instruments are less accurate but can measure higher currents. PMMC instruments are inherently more expensive compared to moving iron instruments.
Both PMMC (Permanent Magnet Moving Coil) and moving iron type measuring instruments are analog devices used for measuring electrical quantities. They both operate based on the interaction between magnetic fields and electric currents to produce a mechanical deflection for display. Additionally, they are both commonly used in applications where accuracy and precision are important factors.
PMMC instruments have a uniform scale because the deflection of the coil is directly proportional to the current passing through it. This linear relationship allows for precise measurement of small changes in current, making the scale consistent and uniform.
pmmc stands for permanent magnet moving coil instruments these instruments are secondary measuring instruments in these instruments a permanent magnet is installed and a moving coil in this way when current is passed through the fixed coil then a force will be developed on the moving coil and thus it moves and with this moving pointer moves on the scale and gives the corresponding reading . if someone wants to read it thoroughly then he can try ashfaq hussain , j.b.gupta of basic elelctrical engg. for b.tech first year .
Permanent magnet moving coil instruments are used for measuring d.c. quantities only. This is so because for these instruments the torque is proportional to the operating quantity either voltage or current.
Because in the coil DC current follow easly and pmmc meter is making with coil and AC current is not follow in coil so we used the pmmc only fpr DC current.
aku pon tatau
yes
Null type instruments require a null balance point to be achieved for accurate measurement, while deflection type instruments measure the quantity directly as a deflection on a scale. Null type instruments are more accurate but require more intricate adjustments, while deflection type instruments are simpler to use but may have lower accuracy.
Many types of instruments are made of wood. Drums, string instruments, pianos, the list goes on and on.
Null type instruments require balancing the unknown quantity with a known quantity to obtain a measurement, while deflection type instruments measure the unknown quantity based on the amount of deflection of a pointer or needle. Null type instruments are more accurate but require more setup, while deflection type instruments are simpler to use but may have less precision.
Answer quickly