The Fluke 114 True RMS Digital Multimeter has the simplest of function selection without current range.
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- AutoVolt feature gives you automatic AC/DC voltage selection
- True RMS for accurate AC measurements on non-linear loads
- LoZ feature gives low input impedance measurement which prevents induced voltages
- 0.5% Basic accuracy for DC volts
- 1.0% Basic accuracy for AC volts
- No current measurement function adds an additional level of safety
- Bar graph indicates position within range
- Resistance Measurement and Continuity Test
- Record signal fluctuations using the Min/Max function
- Auto and Manual ranging for added user functionality
- Large backlit display allows for easy visibility in low-lit areas
- Integral holster with probe holders for easy storage
- Complies with EN61010 Safety Standard
- Measurement Category CAT III 600V
The Fluke 114 True RMS Digital Multimeter is the perfect troubleshooting tool for the busy electrical contractor. Its AutoVolt capability automatically switches to measure AC or DC voltage, whichever is present. The LoZ function helps identify induced voltages and prevent false readings.
The Fluke 114 True RMS Digital Multimeter displays both voltage and current readings with a 6000 count resolution, and tests for frequency, continuity and resistance. It’s got a large back lit display that aids visibility in poorly lit areas.
The Fluke Auto-V feature automatically determines whether the measured signal is ac voltage or dc voltage and then selects the correct function and range. The Fluke LoZ function is a ‘Low Impedance’ (Z) test feature. This feature presents a low impedance input to the circuit under test. This low impedance reduces the possibility of false readings and the pick-up of induced voltages and improves accuracy when testing to determine absence or presence of voltage.
Induced voltages occur from having energized circuits and non-energized wiring located in close proximity to each other, such as in the same conduit or cable tray. This condition forms a capacitor and allows capacitive coupling between the energized wiring and the adjacent unused wiring.
When you place your multimeter leads between the open circuit and the neutral conductor, you effectively complete the circuit through the input of the multimeter. The capacitance between the connected, hot conductor and the floating conductor forms a voltage divider in conjunction with the multimeter input impedance. The multimeter then measures and displays the resulting voltage value.
Most digital multimeters available today have an input impedance that's high enough to show the capacitive coupled voltage, giving a false impression of a live conductor. The meter is actually measuring voltage coupled into the disconnected conductor. However, these voltages, at times, can be 80-85% of what the "hard" voltage should be. If not recognized as an induced voltage, additional time, effort and money will be lost troubleshooting circuit problems.
The most common places to encounter induced voltages are blown fuses in distribution panels, unused cable runs or electrical wiring in existing conduit, open ground or neutral on a 230V circuit or where 230V control circuits are used to control the function of production lines line. Some amount of induced voltage can be coupled from the hot side to the open side across the blown fuse. When facilities or buildings are built and wired, it's very common for electricians to pull extra wire through the conduit for future use. These wires are typically left unconnected until needed, but are subject to capacitive inductance. In the case of the control circuits, these circuits are typically located adjacent to unused control lines, thereby creating a potential for an induced voltage measurement.
- Fluke 114
- TL75 Test Lead Set
- User Manual.