TPC 204 Flashcards

1
Q

Digital meters are named such because:

A

Their internal circuits carry signals consisting of 1’s and 0’s

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2
Q

An ADC (ANALOG TO DIGITAL CONVERTER) is an essential part of:

A

All digital meters

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3
Q

Dual slope integrators are found in certain kinds of:

A

ADC’S

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4
Q

In order to generate a display, a digital meter needs a _______ processor, an ADC and a readout control.

A

Signal

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5
Q

All integrating ADC’S count the time it takes to charge or discharge a capacitor to a reference:

A

Voltage

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6
Q

LCD’S (Liquid crystal displays) make better meter displays than LED’s because of their:

A

Low energy requirement

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7
Q

What is usually expressed as plus or minus some percentage and expresses a meters maximum and minimum expected error?

A

Accuracy

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8
Q

D’Arsonval movements are used in ______ meters

A

Analog

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9
Q

Ohm per volt is the measurement unit used to express a meters:

A

Sensitivity

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10
Q

A parallel leg or branch added around an analog meter movement is known as a:

A

Shunt

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11
Q

The purpose of a make then break switch is to:

A

Protect the meter movement from overcurrent

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12
Q

You will destroy an analog ammeter if you connect it in:

A

Parallel instead of series

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13
Q

To connect an ammeter to a circuit, you need to:

A

Open the circuit

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14
Q

PMMC galvanometer movement for DC can be converted to measure AC with the addition of a:

A

Rectifier

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15
Q

The best way to take an ammeter reading on a live circuit is with a clamp on ammeter because you don’t have to:

A

Break into the circuit

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16
Q

An accurate wattmeter will always show the true power consumed, which takes into account the power losses due to:

A

The power factor

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17
Q

An internal variable resistor is needed in an ohmeter to:

A

Compensate for aging batteries

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18
Q

The jaws of a clamp on ammeter serve as a:

A

Transformer secondary

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19
Q

Use clips on the end of voltmeter leads whenever:

A

Voltage levels are high

20
Q

Circuit resistance is measured by an:

21
Q

The current flowing through an ohmeter is usually very small, on the order of:

A

Mircoamperes

22
Q

The main tests you are likely to perform using a megohmeter are for continuity, shorts, grounds and:

A

Insulation condition

23
Q

To test the condition of the insulation on motor windings, use a:

A

Megohmeter

24
Q

Shorted capacitors exhibit _______ resistance when tested with a megohmeter.

A

Little to no

25
When you need to measure a very small resistance, use a _______ ohmeter. When you need to measure larger resistances, use a _______.
Shunt; series ohmeter
26
Dual shunts in an ohmeter provide:
Dual range capabilities
27
VOM stands for:
Volt-ohm-miliameter
28
The main advantage of an analog/digital multimeter is that it can allow you to:
Spot trends more easily than with a DMM
29
When using a multimeter to measure voltage, what should you do after turning on the device and turning the range selector to its highest voltage?
Check the meter on a known source
30
Current and voltage readings taken on the far right of the meter scale provide greater:
Accuracy
31
Graphical multimeters can perform functions that standard digital meters cannot, such as:
Displaying transients
32
In the GLITCH CAPTURE MODE, the meter is set so that you can view:
Transient spikes
33
You should use a current probe with a multimeter whenever you need to:
Measure high magnitude current
34
Using a GMM in TREND mode, you can monitor:
Line voltage for sags and surges
35
A chief cause of catastrophic meter failure is usually an:
Unexpected voltage
36
In a CAT III installation category, you would expect to find:
Three phase motors and adjustable speed drives
37
Transducers may be attached to an oscilloscope in order to:
Measure different kinds of signals
38
Inscribed on the screen of most oscilloscopes is grid like pattern, called a:
Graticule
39
If an oscilloscope doesn't have a free running sweep, it will have a:
Triggered sweep
40
A dual trace oscilloscope is used to:
Display two wave forms at once
41
Regardless of whether an oscilloscope is analog or digital, single or dual trace, it can still be either a real time oscilloscope or a:
Sampling oscilloscope
42
Most oscilloscopes can also fill in the missing parts of a wave between the sample points. This is called:
Interpolation
43
Slope and trigger controls give you control over exactly where in the waveform you want the screen display to:
Begin
44
An attenuated probe is used to minimize the effects of:
Circuit loading
45
Square wave signals are used in oscilloscopes to:
Compensate the probe
46
Strong harmonics of the original voltage sine wave appear in an AC Power line caused by:
Non-linear loads
47
All meters have one thing in common. They all have an internal ______ to which measured values are compared.
Standard