The TPI 194 digital multimeter (also known as a multitester) is a true RMS, auto-ranging meter for measuring current, voltage, resistance, capacitance, and frequency in electrical testing and heating, ventilation, air-conditioning, and refrigeration (HVAC/R) applications. The meter comes with a set of detachable test leads. The triple LCD displays three readings at once, such as voltage, current, and resistance. The LCD shows readings both in digits and on a 51-segment bar graph, and it is backlit for readability in low light. An audible continuity sensor confirms a circuit conducts electricity, and a diode test detects proper functioning of a circuit’s diodes. The user can set high and low limits for pass/fail testing, view readings as a percent of a reading relative to a stored value, and compare a reading to a preset reference value to verify the compatibility and tolerance of electronic components. The meter's internal memory stores maximum, minimum, and average values for a session for future recall. A hold function can hold up to two readings on the display, even after the meter has been disconnected. The RS-232 interface connects the meter to a computer for data transfer and remote operation (cable sold separately, software included). The adaptor mode allows current and temperature adaptors (sold separately) to be connected to the meter. The unit automatically turns off after 15 minutes of nonuse to conserve battery life, and a low-battery indicator signals when the meter's batteries need to be replaced. A removable rubber holster helps protect the meter during transport and storage.
This true RMS (root mean square) meter provides accurate readings when measuring linear loads, such as standard induction motors and incandescent lights, where the current or voltage has an undistorted waveform, or nonlinear loads, such as electronic devices or motors, where the current or voltage has a distorted waveform. 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 LCD has a 50,000-count resolution, meaning it can display up to 49,999 units (4-3/4 digits) before the operating range needs to be changed. It meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for Category III installations up to 1,000V, 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), and Category IV installations up to 600V, which covers measurements at the source of the low-voltage supply (such as electricity meters and overcurrent protection devices).
|Maximum alternating current (AC) input||10 amp|
|Maximum direct current (DC) input||10 amp|
|Maximum AC voltage input||1,000 volts (V)|
|Maximum DC voltage input||1,000V|
|Maximum DC millivolts||500 millivolts|
|Maximum resistance detected||50 megaohms|
|Maximum frequency detected||500 kilohertz (kHz)|
|Maximum capacitance detected||20 millifarads (mF)|
|Power requirement||9V battery (one, installed)|
|Standards met||European Conformity (CE); International Electrotechnical Commission (IEC) safety standard 61010:2001; European Union EMC (EN) EN61326-1:2006, EN61326-2-1:2006; Underwriters Laboratories (UL) listed; Canadian Standards Association (CSA)|
|Weight||850 g/1.9 lb.|
|Dimensions||220 x 110 x 65 mm/8.7 x 4.3 x 2.6 inches (H x W x D)|
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.
Multitesters (also called 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, multitesters 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. Multitesters 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.
Test Products International (TPI) manufactures test and measurement equipment such as oscilloscopes, manometers, multimeters, and test leads. The company, founded in 1997, is headquartered in Beaverton, OR.