Fluke 189 user manual Conductance Measurement

Page 47

Making Measurements	3
Using Conductance for High Resistance Tests

	189 LOGGING MULTIMETER
					nS
AutoHOLD	FAST MN MX		LOGGING	YES
HOLD	MIN MAX		REL
	CANCEL		SAVE
	Hz % ms
SETUP	nS
	nS				Press twice to
ac+dc mV				F	Press twice to
ac+dc mV			C		select nS.
ac+dc V				A
ac+dc V				mA
dB mV				A
dB V				A
dB V				mA
				ac+dc
OFF				A
				ac+dc
			VIEW
			CLEAR MEM
				TEMPERATURE
A	mA		COM	V
A	A		COM	V
	A
10A MAX		400mA		CAT
FUSED		400mA		CAT
		FUSED		1000V
					ach023f.eps

The following are some tips for measuring conductance:

•High-resistance readings are susceptible to electrical

noise. Use averaging to smooth out most noisy readings; press M until AVG appears in the display.

•There is normally a residual conductance reading with

the test leads open. To ensure accurate readings, press D with the test leads open to subtract the residual value.

Figure 3-7. Conductance Measurement

3-11

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Contents Model 187 Lifetime Limited Warranty Table of Contents Making Measurements Model 187Iii Specifications MaintenanceList of Tables Model 187 List of Figures Viii Contacting Fluke Safety InformationBefore You Start WWarning Safety InformationBefore You Start International Electrical Symbols SymbolsTurning the Meter On Getting AcquaintedIntroduction Automatic Power Off Battery ConsiderationsAutomatic Backlight Off Low Battery IndicationRotary Switch Rotary SwitchPushbuttons PushbuttonsBlue Key Function Rotary Switch Selections Position Rotary Switch FunctionView MEM Rotary Switch PositionsButton Pushbuttons Yellow Button Description Function Yellow Button Function Pushbuttons Button DescriptionPrimary Display Selecting the RangeUnderstanding the Display Secondary Display Bar GraphDisplay Features Number Feature Display Features Description 8.8.8 Display Features NumberDisplay Features Description Number FeatureFMS8888 HM8888 8.8 Display Features Number 51000Input Terminals Using the Input TerminalsDisplay Hold and AutoHOLD Using Display HoldUsing MIN MAX Using AutoHOLDModel 187 Min Max Avg Using Fast MN MXUsing Hold with MIN MAX or Fast MN MX Using Relative Mode RELMeasuring Voltage Making MeasurementsAC Voltage Measurement Measuring AC VoltageDBm Display DB Measurements in AC Volts FunctionsBoth AC and DC Voltage Measurements Measuring DC VoltageAC and DC Display AC over DC DC over ACCapacitors before measuring resistance Measuring ResistanceOFF Automatically subtract this value Testing for ContinuityUsing Conductance for High Resistance Tests For in-circuit tests, turn circuit power off Conductance Measurement Measuring Capacitance Capacitance Measurement Testing DiodesDiode Test Electrically live circuits Measuring TemperatureShock, do not connect the thermocouples to Input Ranges Measuring CurrentMeasuring Current Input Alert FeatureFollowing are some tips for measuring current Measuring AC Current11. AC Current Measurement Measuring DC Current Current through one component Total current to circuit13. Functions Allowing Frequency Measurement Measuring Frequency14. Hz Display Measuring Duty CycleMeasures Negative Pulse Measures Positive Pulse16. Duty Cycle Display Measuring Pulse WidthStart and Stop on Negative Slope Start and Stop on Positive Slope18. Pulse Width Display Model 187 Logged Readings Memory Using Memory & Communications FeaturesTypes of Memory Saved Readings MemoryStopping Logging Storing Saved ReadingsStarting Logging To avoid electric shock, disconnect the test Viewing Memory DataMEM View DisplayClearing Memory Using Communications 187Model 187 Selecting Setup Options Changing the Default SettingsOption Function Specific Setup SelectionsFactory Default PreconditionChoices Common Setup SelectionsAdjusting the Temperature Offset Changing the Default Settings Setting the Power Off Timeout Selecting Display Resolution 3 1/2 or 4 1/2 DigitsSetting the Line Main Frequency Setting the 24-Hour ClockSaving Setup Options Returning to Factory DefaultsTesting the Fuses MaintenanceIntroduction General Maintenance Replace F2 if Replace F1 if Displayed Replacing the Batteries Battery and Fuse Replacement Case of Difficulty Replacing the FusesUser-Replaceable Parts MP8 MP9 Safety and Compliances SpecificationsPhysical Specifications Feature Summary Basic Specifications Detailed Accuracy Specifications KHz-100 kHz Accuracy Function45-1 kHz 20 kHzDC a 500.00 Ω Capacitance Diode Test MIN MAX AVG Burden Voltage A, mA, µA Frequency Counter SensitivityInput Characteristics