Technical data

6 Tutorial

Output Characteristics

154 E364xA User’s and Service Guide

Figure 6-6 Simplified diagram of the 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 μArms

NORMAL

MODE

NOISE

<5 mVpp*

<0.5 mVrms*

<8 mVpp**

<1 mVrms**

*E3640A/E3642A/E3644A models

**E3641A/E3643A/E3645A models