Fluke 73 user manual

The main difference between the Fluke 73 III and 77 multimeters lies in their functionality and features. Here are the key distinctions:
1. Basic Functions: Both models are digital multimeters (DMMs) and offer essential measurement functions such as AC/DC voltage, resistance, and continuity. They can also measure capacitance, frequency, and temperature.
2. Display: The Fluke 73 III has a 3.5-digit display (max reading of 3999) with a bar graph, while the Fluke 77 has a 3.75-digit display (max reading of 3999).
3. True RMS: The Fluke 77, unlike the Fluke 73 III, provides True RMS (Root Mean Square) AC voltage measurement. This enables accurate readings for complex waveforms, including non-sinusoidal or distorted signals.
4. Diode Test: While the Fluke 73 III lacks this feature, the Fluke 77 includes a diode test function for identifying diode failures and forward voltage drops.
5. Backlight: The Fluke 77 comes with a built-in backlight, allowing better visibility in low-light environments. The Fluke 73 III does not have this feature.
6. UL Rating: The Fluke 73 III has a CAT III 600V safety rating, meaning it is suitable for use in electrical distribution systems. The Fluke 77 has an improved CAT IV 600V/CAT III 1000V rating, making it safer for industrial environments.
7. Price: The Fluke 73 III typically has a lower price compared to the Fluke 77, reflecting the differences in functionality and features.
When choosing between the Fluke 73 III and 77, consider your specific measurement needs and the features that are important to you.

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.