Measuring AC Current | Fluke 189 guide

Model 187 & 189

Users Manual

The following are some tips for measuring current:

•If the display shows LEAd5 and you are sure the meter is set up correctly, test the meter’s fuses as described under "Testing the Fuses" in Chapter 6.

•A current meter drops a small voltage across itself, which might affect circuit operation. You can calculate this burden voltage using the values listed in Chapter 7 under Burden Voltage (A, mA, µA).

Measuring AC Current

To measure ac current, set up the meter as shown in Figure 3-11.

The blue pushbutton cannot be used with ac current measurement. All other pushbutton features can be used.

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Fluke 189 user manual Measuring AC Current, Following are some tips for measuring current

Contents

Model 187 Lifetime Limited Warranty Table of Contents Model 187 Making Measurements Iii Maintenance Specifications List of Tables Model 187 List of Figures Viii Safety Information Before You StartContacting Fluke Safety Information WWarning Before You Start Symbols International Electrical Symbols Getting Acquainted IntroductionTurning the Meter On Battery Considerations Automatic Power Off Low Battery Indication Automatic Backlight Off Rotary Switch Rotary Switch Pushbuttons Pushbuttons Rotary Switch Selections Position Rotary Switch Function Blue Key Function Rotary Switch Positions View MEM Button Pushbuttons Yellow Button Description Function Pushbuttons Button Description Yellow Button Function Selecting the Range Understanding the DisplayPrimary Display Bar Graph Secondary Display Display Features Number Feature Display Features Description Display Features Number 8.8.8 Number Feature Display Features Description Display Features Number 51000 FMS8888 HM8888 8.8 Using the Input Terminals Input Terminals Using Display Hold Display Hold and AutoHOLD Using AutoHOLD Using MIN MAX Model 187 Using Fast MN MX Min Max Avg Using Relative Mode REL Using Hold with MIN MAX or Fast MN MX Making Measurements Measuring Voltage Measuring AC Voltage AC Voltage Measurement DB Measurements in AC Volts Functions DBm Display Measuring DC Voltage Both AC and DC Voltage Measurements AC over DC DC over AC AC and DC Display Measuring Resistance Capacitors before measuring resistance OFF Testing for Continuity Automatically subtract this value Using Conductance for High Resistance Tests For in-circuit tests, turn circuit power off Conductance Measurement Measuring Capacitance Testing Diodes Capacitance Measurement Diode Test Measuring Temperature Shock, do not connect the thermocouples toElectrically live circuits Measuring Current Input Ranges Input Alert Feature Measuring Current Measuring AC Current Following are some tips for measuring current 11. AC Current Measurement Measuring DC Current Total current to circuit Current through one component Measuring Frequency 13. Functions Allowing Frequency Measurement Measuring Duty Cycle 14. Hz Display Measures Positive Pulse Measures Negative Pulse Measuring Pulse Width 16. Duty Cycle Display Start and Stop on Positive Slope Start and Stop on Negative Slope 18. Pulse Width Display Model 187 Saved Readings Memory Using Memory & Communications FeaturesTypes of Memory Logged Readings Memory Storing Saved Readings Starting LoggingStopping Logging Viewing Memory Data To avoid electric shock, disconnect the test View Display MEM Using Communications 187 Clearing Memory Model 187 Changing the Default Settings Selecting Setup Options Precondition Function Specific Setup SelectionsFactory Default Option Common Setup Selections Choices Adjusting the Temperature Offset Changing the Default Settings Selecting Display Resolution 3 1/2 or 4 1/2 Digits Setting the Power Off Timeout Setting the 24-Hour Clock Setting the Line Main Frequency Returning to Factory Defaults Saving Setup Options Maintenance Introduction General MaintenanceTesting the Fuses Replace F2 if Replace F1 if Displayed Replacing the Batteries Battery and Fuse Replacement Replacing the Fuses User-Replaceable PartsCase of Difficulty MP8 MP9 Specifications Safety and Compliances Physical Specifications Feature Summary Basic Specifications Detailed Accuracy Specifications 20 kHz Accuracy Function45-1 kHz KHz-100 kHz DC a 500.00 Ω Capacitance Diode Test MIN MAX AVG Frequency Counter Sensitivity Burden Voltage A, mA, µA Input Characteristics