Agilent Technologies E3640-90001 Manual

A SERVICE OF

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Chapter 7 Tutorial

Output Characteristics

142

Figure 7-6. Simplified Diagram of Common Mode and Normal Mode

Sources of Noise

When the load changes very rapidly, as when a relay contact is closed, the

inductance in the hook up wire and in the power supply output will cause a

spike to appear at the load. The spike is a function of the rate of change of the

load current. When very rapid changes in load are expected, a capacitor with

a low series resistance, in parallel with the power supply, and close to the load

is the best way to minimize these voltage spikes.

OUTPUT

TERMINAL

OUTPUT

VOLTAGE

COMMON

MODE

NOISE

<1.5 uArms

NORMAL

MODE

NOISE

R

<5mVpp*

<0.5mVrms*

<8mVpp**

<1mVrms**

*E3640A/41A/44A models

**E3641A/43A/45A models