Fluke VR101S manual How Bad is Bad?, Cbema Curve

Page 50

VR101S

Users Manual

Sag An operating voltage of 90% of nominal volts or less

Swell More than one cycle above 10% of nominal Dropout Power loss of 1 ms to 1 s

Outage More than 1 s of power loss

Positive Transient A momentary overvoltage of 4 ms or less

Negative Transient A momentary undervoltage of 4 ms or less

Frequency Variation ± 1Hz of the fundamental frequency (50 or 60Hz)

How Bad is Bad?

Manufacturers of electrical equipment may specify requirements for power quality. The tolerances below are general and do not apply to all manufacturers of sensitive electronic equipment. Generally, sensitive equipment (computers) can operate within the following voltage tolerances:

Swells

∙Up to 10% above nominal continuously

∙Up to 30% above nominal for less than 0.5 seconds

Sags

∙Down to 10% below nominal continuously

∙Down to 30% below nominal for less than 0.5 seconds

∙Down to 0 volts for 4 ms (acceptable but not recommended)

Transients

∙Not to exceed ± 150% of sine voltage for more than 0.2 ms

Frequency Variation

∙± 1Hz

The CBEMA Curve

The Computer Business Equipment Manufacturers Association (CBEMA) has published a susceptibility graph detailing how various types of power line disturbances affect sensitive electronic equipment (see below).

42

Image 50

Contents VR101S Page Limited Warranty & Limitation of Liability Service Centers Table of Contents Chapter Chapter VR101S Introduction Features of the Voltage Event Recorder SystemGetting Started Quick Overview Safety Plugging in a recorderUsing an Ungrounded Outlet Polarity IndicationElectrical Immunity Safety InspectionBattery Care Maintenance Product ServiceWhat You Need to Run Fluke EventView Software What’s in the VR101S PackageInstalling EventView software Installing EventView software Setting the Time and Date Starting EventView Setting Up the VR101Connecting the Optical Interface Cable Selecting a COM Port Opening the Site Report WindowVoltage Swells Setting Thresholds on the Status TabVoltage Transients Voltage Sags Line Frequency VariationsFlash When Data Available Viewing the Default Threshold SettingsChoosing and Saving New Default Threshold Settings Choosing Operating OptionsViewing Recorder Information Describing the SiteViewing Realtime Readings of the Recorder Starting Event Recording Sending the Setup to the RecorderClearing all events from the recorder VR101S Retrieving Saving Events Retrieving Events from a RecorderSaving Events Opening an Already Saved File VR101S Viewing the Events Tab Displaying and Printing EventsDisplaying Events Event column Event # columnStart Time column Displaying and Printing Events Hot to Neutral Thresholds Extreme Column End Time/Duration/Degree ColumnVR101S Viewing Events as a Bar Graph Quick Summary Viewing a Single Transient as a Graph Viewing Events as an Event Distribution Graph VR101S Changing Graph Styles Printing Events Printing Events from the Events TabTroubleshooting Optical Interface CableIRQ Printers Voltage Event RecorderTechnical Support Why Is It Such a Concern? Power Quality Issues Power Quality Background Effects of Poor Power Quality within Your OrganizationWhy Not Buy a Protection Device? Common Questions about Power QualityWhy Not Use a Meter and Check? Disturbance-Free Voltage Common Power Line Disturbances Power Quality Definitions StandardsPower Line Disturbance Definitions How Bad is Bad? Cbema CurveCauses and Effects of Poor Power Quality Causes of Poor Power QualityHow Power Line Disturbances Affect Your Equipment Performing a Power Quality Study Developing a Power Quality Monitoring ProgramDeveloping a Tolerance Plan Finalizing the Power Quality Monitoring PlanDeveloping a Location Plan Developing the Study Duration StrategyFinal Note Unrepetitive / Isolated Events Now That I Have This Information, What Do I Do with It?Repetitive / Cycling Events Transient Power Line VR101S VR101 Specifications Equipment RatingsPlug Configurations VR101 Specifications Sag, Swell & Outage Measurement Neutral to groundTransient Measurement Frequency MeasurementTime Measurement Events 1 secondApprovals Declaration of Conformity Statement of ConformityIndex VR101S Index VR101S