Introduction General Maintenance, Testing the Fuses | Fluke 189

Introduction

This chapter describes basic operator maintenance. For calibration and performance test information, order the 187 & 189 Service Manual, PN 1584337.

General Maintenance

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.

Dirt or moisture in the terminals can affect readings and can falsely activate the Input Alert feature. Clean the terminals as follows:

1.Turn the meter off and remove all test leads.

2.Shake out any dirt that may be in the terminals.

Chapter 6

Maintenance

3.Soak a new swab with alcohol. Work the swab around in each terminal.

Testing the Fuses

Before measuring current, test the appropriate fuse as shown in Figure 6-1. If the tests give readings other than those shown, have the meter serviced.

WWarning

To avoid electrical shock or personal injury, remove the test leads and any input signals before replacing the battery or fuses. To prevent damage or injury, install ONLY specified replacement fuses with the amperage, voltage, and speed ratings shown in Chapter 7.

6-1

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Fluke 189 user manual Introduction General Maintenance, Testing the Fuses

Contents

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