Agilent Technologies U8001A Specifications download pdf (Page 6)

Instrumentation Laboratory Exercise 3

1.2 Electrical safety

Electrical voltages and currents can be dangerous if they occur at

values that interfere with physiological functions. All of the laboratory

exercises described in this manual are designed to use AC and DC

voltages of less than 15 V. Extra precaution must be taken when

dealing with high voltage lines (240 V

rms

, 110 V

rms

). Unless you are

trained in dealing with these higher voltages ensure that you never

accidently connect your circuits to a live line voltage.

1.3 Resistor color codes

The most common electrical component is the resistor. In this

laboratory, we will be using ¼ W axial- lead resistors. A resistors

value and tolerance are usually coded in with color bands (a, b, c,

tolerance) as illustrated in Figure 1- 1. The colors used for bands are

listed with their respective values in Table 1- 1. A resistor's value and

tolerance are expressed as:

Where the a band represent the tens digit, the b band represent the

ones digit, the c band represents the power of 10, and the tolerance

band represents the tolerance as a percentage of the coded resistance

value.

Figure 1-1 Position of wire lead resistor color band

Rab10

tolerance% Ω±×=

a b c Tolerance

1 2 3 4 5 6 7 8 9 10 11 ... 71 72

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Agilent Technologies U8001A Specifications Page 6