aSuppose you have a Fluke 45 meter in front of you, and it has been in the lab f

Question

aSuppose you have a Fluke 45 meter in front of you, and it has been in the lab for years. It is set to a medium resolution. The voltage being measured is exactly 2V DC. What is on the meter display, and what is the uncertainty value?

b) Suppose the Fluke 45 meter was to measure the DC voltage drop across the 4.7MÙ resistor. What value would be on the meter display?

c) Now assume that instead of DC, the signal were a 1kHz sine wave from a 6 VAC-rms source. What would the meter reading be?

Bench Multimeters 45 Dual Display Multimeter n Vacuum Fluorescent Dual Display True-RMS Voltage and Current, Including ac dc RS-232C Interface Standard, GPMB/IEEE-488.2 Optional O to 90 908 Frequency Measurema ent to 1 MHz 99 999 EO (Co dB Measurements with Selectable Reference Impedances of 2 to 8000e and Audio Power from 20 to 162 Compare Hillo/Pass Function for Quick In-Tolerance Tests Fluke 48 0.05% do Current Accuracy for 4-20 mA Current Loop Service Touch Hold Relative and Min Max Audible Continuity and Diode Test Optional Rechargeable Battery, Carrying Case, Rack Mount Kit&PC; Software Package Closed-Case Calibration Closed-Case Calibration The Fluke 45 is feature-rich 5 digit, impedances, the meter automatically 00,000 count DMM with a unique multi- calculates and displays audio power Calibration can be perlommed via the function dual display, allowing measure- in Watts. RS-232C (or optional IEEE-488. .2 inter- ment of two signal parameters from a face or manually from the front panel. Compare Function single test connection. The Fluke 45 offers No internal adjustments are required. The Fuke 45 has a compare function for high performance and versatility lor manu- Standard Equipment fast in-tolerance limits testing. Upper- and facturing test, depot and field service, and lower-1imits are entered through the front Each Fluke 45 Dual Display Multimeter research and development. A panel. Readouts show both a Hi/Lo/Pass includes an operators manual, quick RS-232C makes it ideal for PC instrument evaluation and measured value. reference guide, ine cord, and test leads. Touch Hold Relative and Dual Display Min/Max Specifications The Fluke 45 is the first DMM with a Touch Hold captures the measurement, multifunction "dual display, allowing the beeps and locks it on the digital display user to select a wide variety of measure- Technical Specifications until you are ready to view it. It auto- ment combinations. It is particularly useful Accuracy specifications are given as matically updates with each new stable in a pplications requiring two different (Rb of reading) [number of least signif- measurement. The Relative mode femem- of the same signal ie.

Explanation / Answer

1)according to the DC voltage table, if the voltage to be measured is 2 volts, the given Fluke 45 meter will display 2.0000 volts with a resolution of 100 micro volts and accuracy/uncertainty of 0.025%+2 (because the meter has been in the lab for over an year)

2)Since the quantity being measured is DC voltage of 2 volts across the 4.7 Mega ohm resistor, the meter will still display 2.0000 volts with an uncertainty of 0.025%+2

3) 1kHz sine wave with 6 volt rms value. The meter will display the rms value of 6 volts with uncertainty/accurracy of 0.2%+10

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