Diode Circuit Model

Hobby TRMS DMM Vendor- Price Vs functionality?

Suggest a few quality Digital MULTIMETERS(DMM) manufacturers
as available in South India that has equivalent and circuit protection functionality as of RISHAB's Model# RISH Max-10 with comparable pricing.

Respondents please answer this pertinent Question: How does a TRMS enabled DMM differ from the Max-10 and What does diode
test voltage enhancement to 3V from 1V diode Test imply/ useful.

multimeter or a multitester, also known as a volt/ohm meter or VOM, is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. There are two categories of multimeters, analog multimeters (or analogue multimeters in British English) and digital multimeters (often abbreviated DMM or DVOM.)

A multimeter can be a hand-held device useful for basic fault finding and field service work or a bench instrument which can measure to a very high degree of accuracy. They can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as batteries, motor controls, appliances, power supplies, and wiring systems.

Multimeters are available in a wide ranges of features and prices. Cheap multimeters can cost less than US$10, while the top of the line multimeters can cost more than US$5000.

Contents [hide]
1 History
2 Quantities measured
3 Resolution
3.1 Digital
3.2 Analog
4 Accuracy
5 Sensitivity and input impedance
6 Burden Voltage
7 Alternating current sensing
8 Digital Multimeters (DMM or DVOM)
9 Analog Multimeters
10 Probes
11 Safety
12 See also
13 References
14 External links

[edit] History

AvometerScientists originally used galvanometers to measure current. A galvanometer may be wired to measure resistance (given a known voltage source) or voltage (given a fixed resistance). While appropriate for primitive lab use, switching from one setup to another is inconvenient in the field.

Multimeters were invented in the early 1920s as radio receivers and other vacuum tube electronic devices became more common. The invention of the first multimeter is attributed to a Post Office engineer Donald Macadie[1], who became dissatisfied with having to carry many separate instruments required for the maintenance of the telecommunication circuits. Macadie invented a first instrument, which could measure Amps, Volts and Ohms, so the multifunctional meter was then named Avometer.[2] The meter comprised a galvanometer, voltage and resistance references, and a switch to select the appropriate circuit for the input under test.

Macadie took his idea to the Automatic Coil Winder and Electrical Equipment Company (ACWEEC, founded probably in 1923)[2] The first AVO was put on sale in 1923, and although it was initially a DC-only instrument many of its features remained almost unaltered right through to the last Model 8.

As modern systems become more complicated, the multimeter is becoming more complex or may be supplemented by more specialized equipment in a technician's toolkit. For example, where a general-purpose multimeter might only test for short-circuits, conductor resistance and some coarse measure of insulation quality, a modern technician may use a hand-held analyzer to test several parameters in order to validate the performance of a network cable.[3]

[edit] Quantities measured
Contemporary multimeters can measure many quantities. The common ones are:

Voltage in volts.
Current in amperes.
Resistance in ohms.
Additionally, multimeters may also measure:

Capacitance in farads.
Frequency in hertz
Duty cycle as a percentage.
Temperature in degrees Celsius or Fahrenheit.
Conductance in siemens.
Inductance in henrys
Audio signal levels in decibels.
Digital multimeters may also include circuits for:

Continuity that beeps when a circuit conducts.
Diodes and Transistors
Various sensors can be attached to multimeters to take measurements such as:

Light level
Acidity/Alkalinity(pH)
Wind speed
Relative humidity

[edit] Resolution

[edit] Digital
The resolution of a multimeter is often specified in "digits" of resolution. For example, the term 5½ digits refers to the number of digits displayed on the readout of a multimeter.

By convention, a half digit can display either a zero or a one, while a three-quarters digit can display a numeral higher than a one but not nine. Commonly, a three-quarters digit refers to a maximum value of 3 or 5. The fractional digit is always the most significant digit in the displayed value. A 5½ digit multimeter would have five full digits that display values from 0 to 9 and one half digit that could only display 0 or 1.[4] Such a meter could show positive or negative values from 0 to 199,999. A 3¾ digit meter can display a quantity from 0 to 3,999 or 5,999, depending on the manufacturer.

While a digital display can easily be extended in precision, the extra digits are of no value if not accompanied by care in the design and calibration of the analog portions of the multimeter. Meaningful high-resolution measurements require a good understanding of the instrument specifications, good control of the measurement conditions, and traceability of the calibration of the instrument.

Specifying "display counts" is another way to

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Lecture - 2 Modelling of PN Junction Diodes

Circuits Question Need Answers Fast!?

In the dual diode model of an NPN transistor, the emitter corresponds to
(a) the point where the cathodes are connected together
(b) the point where the cathode of one diode is connected to the anode of the other
(c) the point where the anodes are connected together
(d) either of the diode cathodes

A bipolar junction transistor acts like the following dependent source:
(a) VCVS
(b) CCCS
(c) CCVS
(d) VCCS

Which of the following components is probably NOT found in a regulated power supply?
(a) transformer
(b) rectifier
(c) amplifier
(d) zener diode

Well, in my experience the last question has no answer. All of those components can be found in a regulated power supply. You need the transformer and rectifier to produce a DC voltage, the zener diode is a reference that then feeds an amplifer which (with feedback from a set of voltage sense resistors) then produces a steady DC output that is regulated.

Some folks consider a zener diode to be a regulated power supply, but I do not agree. Its V-I plot shows that its voltage is somewhat constant accross a wide range of diode current. However, there is variation and if you vary the load of a zener voltage supply, you will get an output voltage that varies (not a lot, but you can measure it on a meter). Using a zener coupled with an amplifier, you get an output that is VERY insensitive to load current.

My $0.02 worth, anyway.