Style:with NIST Certificate
The BK Precision 391A digital multimeter (also known as a
multitester) is a true RMS, manual-ranging meter for measuring
current, voltage, resistance, and frequency in electrical testing
applications. The meter comes with a set of detachable test
leads. The logic test reports the logic state of an electronic
circuit. An audible continuity sensor confirms a circuit conducts
electricity, and a diode test detects proper functioning of a
circuit’s diodes. The meter measures duty cycles to 90%,
indicating the percent of time a circuit is on. The microamp
function identifies current changes in flame detector
applications. A hold function keeps a reading on the display,
even after the meter has been disconnected. An alarm sounds when
the test leads are connected to the wrong jack for the
measurement being taken. The unit automatically turns off after
45 minutes of nonuse to conserve battery life, and a low-battery
indicator signals when the meter's batteries need to be replaced.
The meter's body is made of molded rubber, which helps protect it
against damage from falls, impacts, and abrasion. The meter has a
built-in tilt stand for propping on a flat surface, and a hanging
strap is included for hands-free use.
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. It is a manual-ranging meter that requires the operator
to choose the appropriate operating range for the property being
measured. The LCD has a 20,000-count resolution, meaning it can
display up to 19,999 units (4-1/2 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).
Specifications
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Maximum alternating current (AC) input
20 amp
Maximum direct current (DC) input
20 amp
Maximum AC voltage input
750 volts (V)
Maximum DC voltage input
1,000V
Maximum resistance detected
20 megaohms
Maximum frequency detected
200 kilohertz (kHz)
Logic threshold
Pass = 2.8, + or – 0.8V; Fail = 0.8, + or – 0.5V
Duty cycle measurement range
0 to 90%
Power supply
9V battery (one, installed)
Standards met
European Conformity (CE) marked; Underwriters Laboratory listed;
International Electrotechnical Commission (IEC) safety standard
61010-1
Weight
320 g/11.3 oz.
Dimensions
198 x 90 x 40 mm/7.8 x 3.5 x 1.57 inches (H x W x D) mm/
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.
BK Precision manufactures test and measurement instruments for
research and development, production-line testing, and electronic
field service applications. The company, founded in 1951, is
headquartered in Yorba Linda, CA. It meets International
Organization for Standardization (ISO) standard 9001:2008 and is
compliant with Restriction of Hazardous Substances (RoHS) and
waste electronic and electrical equipment (WEEE) directives.
What's in the Box?
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* BK Precision 391A true RMS digital multimeter
* (1) Set test leads
* 9V battery (installed)
* Spare fuse
* Hanging strap
* Instructions
- Digital multimeter measures current, voltage, resistance, and frequency.
- True RMS (root mean square) meter provides accurate readings when measuring linear or nonlinear loads where the current or voltage has an undistorted or distorted waveform.
- Logic test reports the logic state of an electronic circuit.
- Audible continuity sensor confirms a circuit conducts electricity, and diode test detects proper functioning of a circuit’s diodes.
- Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for Category III installations up to 1,000V.