Fluke 175-TRUE-RMS user manual

A true-RMS (Root Mean Square) reading on a Fluke meter refers to the feature of the meter that allows it to accurately measure both sinusoidal and non-sinusoidal AC waveforms.
Traditional meters measure AC voltage and current by first converting the AC into DC- equivalent level, which gives accurate readings for sinusoidal (purely AC) waveforms but can provide considerable errors when measuring non-sinusoidal waveforms.
In contrast, true-RMS meters calculate the root mean square, an equivalent DC voltage, which indicates the same amount of power dissipation that would occur with a pure DC signal.
This makes them ideal for measuring AC voltage in systems that have harmonic distortion (such as power supplies) or noise (such as on power lines), providing much more precise readings.
Fluke Corporation, a manufacturer of industrial test, measurement and diagnostic equipment including electronic test equipment, has a number of multimeters that provide true-RMS readings.

The main difference between the Fluke 117 and 175 is their respective capabilities and intended use.
The Fluke 175 is a True RMS (Root Mean Square) multimeter, which means it can accurately measure both sinusoidal and non-sinusoidal AC waveforms. It is designed to be a general-purpose multimeter with various measurement functions, including voltage, current, resistance, capacitance, continuity, and frequency. The Fluke 175 is ideal for professional electricians, technicians, and engineers who need to handle a wide range of electrical measurements.
On the other hand, the Fluke 117 is also a True RMS multimeter but comes with additional features specifically aimed at electricians. It includes non-contact voltage detection (VoltAlert™) for quick identification of live wires, a low impedance (LoZ) mode to prevent false readings caused by ghost voltage, and a built-in flashlight for working in low-light areas. The Fluke 117 is designed to meet the specific needs of electricians and is often preferred for troubleshooting and maintenance tasks in residential and commercial electrical systems.
In summary, while both the Fluke 117 and 175 are True RMS multimeters, the Fluke 117 caters to electricians with specialized features, whereas the Fluke 175 is a more general-purpose multimeter suitable for a wider range of applications.

Fluke multimeters typically have a variety of symbols that represent different functions and features of the device. The specific symbols may vary between different models, but here are some common symbols found on Fluke multimeters and their meanings:
1. "V" or "~": Represents AC voltage measurement mode.
. "V" with a straight line above it: Indicates DC voltage measurement mode.
3. "A" or "mA": Stands for amperes or milliamperes, representing current measurement mode.
4. "Ω" or "Ohm": Denotes resistance measurement mode.
5. "~" with a horizontal line through it: Indicates the device can measure AC current.
6. "^" or "Continuity": Represents continuity testing mode, used to check if a circuit is complete.
7. "Diode": Indicates the diode testing mode.
8. "Hz" or "frequency": Denotes frequency measurement mode.
9. "°C" or "°F": Represents the Celsius or Fahrenheit temperature measurement mode.
10. "Hold": Indicates the device can freeze or hold a reading.
11. "Min" or "Max": Shows the minimum or maximum value recorded by the device.
12. "Auto" or "AutoRanging": Represents the automatic ranging feature, where the meter selects the appropriate measurement range.
13. "Alert" or "Warning": Indicates an alert or warning function, such as high-voltage detection or input overload.
14. "Battery": Denotes the battery status or low battery indication.
15. "COM" or "Common": Represents the common terminal for connecting the black or negative test lead.
It is important to refer to the user manual of the specific Fluke multimeter model for comprehensive information on the symbols and their meanings, as they may vary based on the model.