Table of Contents
When working on a hybrid vehicle which type of meter is recommended?
a digital multimeter that is rated to at least 1000 volts, CAT III or CAT IV, and.
When using a DMM The black lead usually goes in which port?
If you’re testing a 12-volt car battery, select the next highest option—20 DCV. Then make sure to connect your test leads to the proper jacks before testing: For voltage testing, plug the red lead in to the port labeled “V.” For this and all multimeter tests, the black lead plugs into the common (COM) port.
When measuring resistance a reading of OL on the DMM indicates <UNK>?
The OL reading indicates the diode is functioning as an open switch. A bad (opened) diode does not allow current to flow in either direction. A multimeter will display OL in both directions when the diode is opened. A shorted diode has the same voltage drop reading (approximately 0.4 V) in both directions.
Which type of ammeter can measure current when clamped around a conductor?
Clamp-on ammeters are used to measure current in a circuit with over 1 A of current and in applications where the ammeter’s jaws can easily be placed around one of the conductors. Voltage and resistance can also be measured by most clamp-on ammeters.
When working with a hybrid vehicle HV What are some safety precautions that need to be taken?
Maintain a “safety zone” around their work, including using yellow caution tape and “DO NOT TOUCH “HIGH-VOLTAGE” signs when high-voltage system repairs are to be left unattended. 1. Do NOT touch ANY high-voltage wiring, connectors, or parts, such as the inverter or the hybrid battery assembly. 2.
What are the recommended items that should be used when working with the high-voltage HV circuits of a hybrid electric vehicle?
Most EV manufacturers recommend that insulated rubber gloves should be worn when working near all high-voltage components, not just the vehicle batteries.
When using a DMM to test resistance the red lead is connected to the a jack?
The red lead is connected to either of the appropriate jacks depending on what the maintainer wants to measure – ohms, volts or amperes. The two jacks on the left are utilized when measuring current, either in the 300mA or the 10 ampere range.
When using a DMM How do you measure resistance?
To perform a measurement with a DMM simply connect V+ to one end of the resistor and V – to the other end and set the DMM to measure resistance. The DMM supplies a constant current source to the resistor and the meter measures the voltage across it, the voltage being proportional to the resistance.
What port does multimeter use?
mAVΩ is the port that the red probe is conventionally plugged in to. This port allows the measurement of current (up to 200mA), voltage (V), and resistance (Ω). The probes have a banana type connector on the end that plugs into the multimeter. Any probe with a banana plug will work with this meter.
What does OL mean on a DMM?
Most DMMs measure down to 0.1 Ω, and some measure as high as 300 MΩ (300,000,000 ohms). Infinite resistance (open circuit) is read as “OL” on the Fluke meter display, and means the resistance is greater than the meter can measure.
What does OL mean in electrical terms?
OL does not mean “Over Load”, it means “Open Loop”. The meter is fine, it is an open circuit, meaning it has no voltage to measure.l.
When using a DMM to measure amperage within a circuit What must the technician do with the DMM to get a reading?
Open the circuit at a point between the power supply, which is the battery, and the load in the circuit. remember to always break the circuit when measuring amps with a digital multimeter. What is step 8 in measuring amperage?.
How will measures current by using clamp meter?
A clamp meter is a clothespin-shaped instrument that can be clamped around a live wire in order to measure the current it’s carrying. As a measurement principle, clamp meters detect the magnetic field emitted by current flowing in a wire in order to measure the current value.
What is clamp-on ammeter used for?
Clamp-on ammeter or simply ‘clamp meter’ is an instrument that is used to measure the current flowing through a conductor. An AC Clamp meter basically consists of a current transformer in its jaws, bar CT usually.
Which instrument is used to measure the amount of electrical current intensity in a circuit?
Ammeter – an instrument used to measure the amount of electrical current intensity in a circuit. The unit of measure is ampere (a). It is connected along or series to the circuit.
Are hybrid vehicles safe?
Hybrid vehicles can be among the safest vehicles on the road. The National Highway Transportation Safety Administration (NHTSA) tests new vehicles for structural integrity and accident protection in three primary categories — front crash, side crash, and rollover — with a five-star rating system.
What are the safety issues for working on an electric vehicle?
The main dangers in hybrid and electric vehicle repair are electrocution and the possibility of the car turning on accidentally while work is being performed. These serious risks make safety training a priority.
What are the dangers associated with working on hybrid and electric vehicles?
Risks of working with E&HVs the storage of electrical energy with the potential to cause explosion or fire. components that may retain a dangerous voltage even when a vehicle is switched off. the potential for the release of explosive gases and harmful liquids if batteries are damaged or incorrectly modified.
What type of clothing should be worn when working around high-voltage systems?
Arc clothing and PPE such as arc flash suits should be worn when working on energised conductors, cables or circuits. Due to the complexity and criticality of medium/high voltage electrical systems it can be impossible to switch off, secure isolation, work dead and never work on live equipment.
What rating should a DMM have to be safely used on a hybrid electric or electric vehicle?
“When measuring voltages on hybrid vehicles, always use a DMM with minimum safety rating of CATIII 1000V,” according to Steve White, president of Electronic Specialties. “In addition, your test leads should also be rated CATIII 1000V.”May 2, 2013.
What minimum class of glove should a technician use when working on a HV vehicle?
Class 0 insulated rubber gloves, or lineman’s gloves, are required whenever working near high-voltage parts on an electric or hybrid electric vehicle.
