Unit of Measurement with Example

Units of measurement:-

Measurement	Units	Symbol
voltage	Volt	V
Current	Ampere	A (I)
Resistance	Ohm	Ω
Power	Watt	W
Frequency	Hertz	Hz
Capacitance	Fard	F

Multimeter:- 

Company  :-  1) Fluke

                     2) Mica

                     3) Rishb

Multimeter is used to measure Ac voltage & Dc voltage, Ac & Dc current, resistance mili & micro volts, cable continuity.

Diagram of Multimeter (Fluke)

Voltage and current measurement (Diagram)

NOTE: - 1. Voltage is always measure in parallel.

    2. Current is always measure in series.

Temp transmitter          (TT)

Pressure transmitter      (PT)

Level transmitter           (LT)

Flow or DPT transmitter :- (FT) (DPT)

Two wire transmitter

1.       Transmitter supply voltage = 24VDC

2.       Transmitter output = 4 to 20 MA DC

Circuit Diagram

NOTE: - standard checking system of mili ampere in instrument.

a.       Always take (-) series to check

b.      All transmitters’ works on two wire system.

Transmitter supply voltage is 24vdc that is applied to transmitter in parallel. Transmitter output is 4 to 20 ma that is current output we know that current is always measured in series so in above diagram (-) to (-) line is standard series line so using Multimeter in series we can measure 4 to 20 mili ampere current output.

Indicator

1.       DCS

2.       PLC

3.       Controller

4.       Indicator

How to use indicators shown in diagram below

                                                                         Diagram