283

the accuracy of a digital indicator ranges from

.1 to 1 of full scale

For each 20db, the signal-to-noise ratio increases by a factor of

10

the gauge factor for a typical bounded foil strain gauge is

2

LEDs used for critical fiber drivers generally emit light in the range of ___ nm.

400 to 700

if a differential amplifier with a common-mode rejection ratio of 60dB has a 5v common-mode input signal, its output will be equal to that of a normal-mode signal of

5mv

In a open loop control system

A and c above

What is generally the most common and troublesome EMI source?

AC power systems

An advantage of half-duplex serial transmission is that it can

Communicate in two directions simultaneously

Local indicators

Display information near the sensor

which number system uses 16 characters, 0 through 9 and A through F

HEX

All of the following are advantages of analog indicators except

Immunity to vibration

The output of a differential measurement device is proportional to the difference between

It's two signal inputs

The control computer asks a node for data in a _____ network.

Polled

Graded index and single-mode fiber optic cables have been developed to

Reduce the distortion from multiple-mode propagation

Data loggers generally are used to record

Slowly changing data

Which of the following data transmission methods is useful over the greatest distance?

Telemetric

If a discrete switch includes some deadband, this means that

The turn on and turn off values are different

Serial to parallel and parallel to serial conversion for serial transmission is preformed by integrated circuits called

UARTs

developed in the 1990s, which serial communication standard defines cables and protcols for short run between computers and other devices

USB

most data that are to be transmitted digitally as ____ signals.

analog

when compared to copper wire cables, optical fiber cables

are stronger

which of the following helps reduce ground loop noise?

cleaning and tightening ground connections

a ground loop is a

common source of noise

what is the function of the demodulator in a fiber optic system

decode the signal into a binary data steam

the main advantage of pneumatic data transmission is that it

is intrinsically safe