AC over DC DC over AC, AC and DC Display | Fluke 187 manual

		Making Measurements	3
		Measuring Voltage	3
AC over DC	DC over AC	AC + DC
			tc024f.eps

Figure 3-3. AC and DC Display

When the meter shows ac over dc or dc over ac, the following other pushbutton functions are not available:

•AutoHOLD ( O Q)

•MIN MAX ( M)

•FAST MN MX ( O M)

•Hz ( N)

•Relative ( D)

•LOGGING (O D)

3-5

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Fluke 187 user manual AC over DC DC over AC, AC and DC Display

Contents

Model 187 Lifetime Limited Warranty Table of Contents Model 187 Making Measurements Iii Maintenance Specifications List of Tables List of Figures Viii Before You Start Safety InformationContacting Fluke Safety Information WWarning Before You Start Symbols International Electrical Symbols Introduction Getting AcquaintedTurning 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 Understanding the Display Selecting the RangePrimary 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 Shock, do not connect the thermocouples to Measuring TemperatureElectrically 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 Using Memory & Communications Features Types of MemorySaved Readings Memory Logged Readings Memory Starting Logging Storing Saved ReadingsStopping Logging Viewing Memory Data To avoid electric shock, disconnect the test View Display MEM Using Communications 187 Clearing Memory Changing the Default Settings Selecting Setup Options Function Specific Setup Selections Factory DefaultPrecondition 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 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 Specifications Safety and Compliances Physical Specifications Feature Summary Basic Specifications Detailed Accuracy Specifications Accuracy Function 45-1 kHz20 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