The TPI 183a digital multimeter (also known as a multitester) is s true RMS (root mean square), auto- and manual-ranging meter that measures current, voltage, frequency, capacitance, and resistance, and performs continuity and diode tests in electrical applications. An audible continuity sensor confirms a circuit conducts electricity, and a diode test detects proper functioning of a circuit's diodes. Duty cycle measures percent of pulse width modulation (PWM), and an active low-pass filter provides accurate measurements in noisy environments. Separate 10 amp and 500 microamp fuses protect the meter from damage. A low DC microamp range provides flame-safety measurements. The meter provides statistical information such as minimum, maximum, compare, and relative mode. The relative mode stores a reading in memory to use as a zero point for subsequent readings so that multiple readings can be compared as a percentage of the stored reading, and is used for component checking. Compare mode compares the measured values with a stored value, and is used for component matching. Temperatures can be measured using a K-type thermocouple (not included). The data hold feature holds up to two readings on the display for recording. Auto power-off turns the meter off after 30 minutes of non-use to preserve battery life. The isolated optical-to-USB output exports data to a computer while measurements are being taken (requires cable and software, not included). A molded rubber boot protects the meter against damage from falls, impacts, and abrasion, and a tilt stand provides viewing for one-handed operation.
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 backlit LCD has a 4,000-count resolution, meaning it can display up to 3,999 units (3-3/4 digits) before the operating range needs to be changed. The display shows two readings simultaneously, and an analog bar graph allows the user to observe fluctuations at a glance. The meter meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for Category II installations, up to 1000V which covers most protected electronic equipment (such as small household appliances) 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), and Pollution Degree 2 for indoor use. The meter includes a silicone test lead set, a temperature input adapter, a beaded K-type thermocouple, one 9V alkaline battery, and instructions.
|Maximum AC and DC current||10 amp|
|Maximum AC voltage input||750V|
|Maximum DC voltage input||1000V|
|Maximum resistance detected||40 megaohms|
|Maximum capacitance||10,000 microfarads|
|Other tests||Diode, audible continuity sensor, duty cycle, low-pass filter|
|Power requirement||9V battery, included|
|Standards met||Underwriters Laboratory- Canadian and U.S. Standards (cULus) 61010-1; International Electrotechnical Commission (IEC) safety standard 61010:2001; Category II installations up to 1000V; Category III installations up to 600V; Pollution Degree 2 for indoor use|
|Weight||14.4oz./380g including boot|
|Dimensions||7.4 x 3.4 x 1.3 inches/187 x 86 x 33mm (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.
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 voltage. Safety ratings are based on International Electrotechnical Commission (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.