Amprobe AM-250 Industrial Digital Multimeter

The Amprobe AM-250 digital multimeter is an average-sensing, auto- or manual-ranging meter for measuring current, voltage, resistance, capacitance, frequency, and microcurrent in heating, ventilating, and air-conditioning (HVAC) and electrical testing applications. The meter comes with a set of detachable test leads that measure alternating current (AC) and direct current (DC) to 10 amp, AC voltage and DC voltage to 1,000 volts (V), resistance to 40 megaohms, capacitance to 3,000 microfarads, frequency to 1 megahertz (MHz), and AC and DC microcurrent to 4,000 amp. The microamp reading identifies current changes in flame detector applications. The maximum reading mode displays the highest reading in a session to track a sudden increase or decrease in readings. The relative zero mode stores a reading in memory to use as a zero point for subsequent readings, allowing for quick comparison of readings. The hold function keeps a reading on the display, even after the meter is disconnected. The backlit liquid crystal display (LCD) is visible in low light. An audible continuity sensor confirms that the circuit conducts electricity, and a diode test detects whether the circuit's diodes work properly. An auto power-off mode turns off the unit after 30 minutes of non-use to conserve battery life, and a low-battery indicator signals when the meter's batteries need to be replaced. The meter measures temperature when used with compatible K-type thermocouple probe (not included).

This average sensing, or average responding, meter provides accurate readings when measuring linear loads, such as standard induction motors and incandescent lights, where the current or voltage has a sinusoidal waveform. Two ranging modes (auto or manual) offer a range of operator control when taking readings. When turned on, the meter is in auto-ranging mode and automatically selects the correct operating range for the property being measured. It can be switched to manual-ranging mode, which allows the operator to choose the appropriate operating range. The meter has a 4,000-count (3-3/4 digit) liquid crystal display (LCD) that can display up to 3,999 units before the operating range needs to be changed. It meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category II installations up to 1,000V (which covers large household appliances and devices connected to a fixed power supply, such as refrigerators and air conditioners), and category III installations up to 600V (which covers items used with enclosed building circuit installations, such as service panel parts, branch circuits, and fixed installations that are connected directly to a building's AC power supply).

Specifications

H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Multimeters are electrical test meters that measure multiple properties of an electrical circuit, such as current, voltage, resistance, capacitance, and continuity. Available in handheld or benchtop models, multimeters diagnose electrical problems in electrical equipment, wiring, and power supplies. A variety of probes, clamps, and leads can be used to connect the meter to a circuit or device. Multimeters display information either in analog or digital form. Factors that influence meter choice include the electrical properties to be measured, the anticipated range of results, and the desired level of protection against transient voltages. Safety ratings are based on the International Electrotechnical Commission's (IEC) standards for low-voltage test equipment. IEC 61010 delineates four overvoltage installation categories. In general, a meter with a category IV rating will provide more protection against transient voltages than a meter with a lower category rating.

Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA.

What’s in the Box?

• Amprobe AM-250 average-sensing digital multimeter
• (1) Set of test leads
• (2) 1.5V NEDA 24G or IEC R03 AAA batteries (installed)
• Instructions