The Fluke 116 True RMS Digital Multimeter delivers the capabilities professionals demand to troubleshoot and repair HVAC (heating, ventilation and air conditioning) systems. It has everything you need in an HVAC meter, including temperature and microamp measurements to help you quickly troubleshoot problems with HVAC equipment and flame sensors.
The Fluke 116 True RMS Digital Multimeter is supplied with the Fluke 80BK-A DMM temperature probe for external temperature measurements it also has a low current microamp range which allows for flame sensor measurement down to 0.1 microamps. These are two unique features for this 110 series Digital Multimeter.
The Fluke 116 True RMS Digital Multimeter displays both voltage and current readings with a 6000 count resolution, and tests for frequency, capacitance, resistance and continuity. 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.
This professional test lead set will cover most electrical/electronic engineering test applications. Fluke SureGrip accessories are designed to improve comfort and safety. Rubber moulded overlay surfaces and finger-hugging curves give the user a comfortable, reliable grip so they can focus on making accurate safe measurements.
This Fluke TLK-225-1 SureGrip Master Accessory Set comprises of the following items:
- Fluke TL224 SureGrip Silicon Test Lead Set (red & black).
- Fluke TP175 - SureGrip TwistGuard Probe Set (red & black).
- Fluke AC285 SureGrip Large Jaw Alligator Clip Set (red & black).
- Fluke AC220 SureGrip Small Grabber Alligator Clip Set (red & black).
- Fluke AC280 SureGrip Hook Clip Set (red & black).
- Fluke AC283 SureGrip Pincer Clips Set (red & black).
- Fluke special six pocket pouch to hold all of the above accessories
