- Manual-ranging digital multimeter measures voltage, current, capacitance, frequency, and resistance, and performs logic and diode tests.
- True RMS meter provides accurate readings when measuring linear or nonlinear loads where the current or voltage has a sinusoidal or nonsinusoidal 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 IEC safety standard 61010 and is certified for Category III installations up to 1000V.
The B&K Precision 391A digital multimeter (also known as a
multitester) is a true RMS, manual-ranging meter used in
electrical testing applications to measure current, voltage,
resistance, and frequency, and perform logic and diode tests. 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. The kit
includes a silicone 4mm sheathed straight-to-right-angle plug
lead set, a red and black flexible pincer set, a probe body set
with 2mm/0.080" diameter tips, a red and black miniature
spring-tip probe, a trifold nylon pouch, and instructions.
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 1000V, 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
10 amp continuous, 20 amps for up to 30 seconds
Maximum direct current (DC) input
10 amp continuous, 20 amp for up to 30 seconds
Maximum AC voltage input
750V
Maximum DC voltage input
1000V
Maximum resistance detected
20 megaohms
Maximum frequency
200kHz
Other tests
Diode and logic
Power supply
9V battery (one, installed)
Safety ratings
European Conformity (CE); Underwriter's Laboratory (UL);
International Electrotechnical Commission (IEC) safety standard
61010 and is certified for Category III installations up to 1000V
Weight
12oz./353g
Dimensions
6.88 x 3.5 x 1.5 inches/175 x 89 x 38mm (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.
B&K 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?
------------------
* B&K Precision 391A true RMS digital multimeter
* 9V battery (installed)
* Spare fuse
* Silicone 4mm sheathed straight-to-right-angle plug lead set
(1.5m)
* Flexible pincer set (red and black)
* Probe body set with 2mm/0.080" diameter tips
* Miniature spring-tip probe (red and black)
* Trifold nylon pouch
* Instructions