Data Sheet
True RMS Bench Multimeters
2831E and 5491B
True RMS Bench Multimeters with
Dual Display
The B&K Precision models 2831E and 5491B
are versatile and dependable bench multimeters
suitable for applications in education, service and
repair, and manufacturing requiring basic and
reliable measurements. Additionally, these
instruments enhance your productivity with
built-in math functions and USB connectivity,
features not found in other bench meters in this
price category. Math operations Rel, Max/Min,
dBm, dB, %, and Hold provide educators with a
convenient tool to teach basic math concepts.
Resolution
Model
2831E 20,000 4 1/2
5491B 50,000 4 3/4
Count Digits
The 2831E and 5491B take typical multimeter
measurements such as volts, ohms, and amps
with great accuracy, stability, and basic VDC
accuracy of 0.02% on the 5491B and 0.03% on
the 2831E. The meters are also capable of
measuring frequency, period, continuity, and
performing diode tests. Readings can be taken at
a maximum rate of 25 readings/sec with
measurement rates selectable between slow,
medium, and fast.
Thes multimeters were designed for
cost-conscious users requiring a basic and
dependable meter with a broad range of features
offered at a value price.
Features & benefits
■ Up to 50,000 count display resolution
■ Basic VDC accuracy of up to 0.02%
■ Dual display to indicate two measurements
simultaneously
■ AC + DC True RMS
■ Up to 25 readings per second measurement
rate
■ AC volt and amp measurement over wide
frequency range (ACV 100 kHz/ACI 20 kHz)
■ Limit mode for Pass/Fail testing
■ Built-in math functions: Rel, Max/Min, dBm,
dB, %, Hold, Compare
■ CATI (1000 V)/CATII (300 V) Protection
■ USB (Virtual Com) and RS232* interface
■ SCPI compatible
*5491B only
Technical data subject to change
© B&K Precision Corp. 2014
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True RMS Bench Multimeters
odels 2831E and 5491B
M
Versatile tools
▲
Dual Display
These meters offer a dual display allowing
multiple measurements to be conveniently
displayed at once. The display values could be
two different measurements or one measurement
expressed in different units. For example, you can
simultaneously read an AC voltage and a
frequency value or a DC voltage value expressed
in volts and in dB.
Easy operation
▲
Bright VFD display capable of
displaying two measurements
Soft rubber control
buttons
Sheathed safety
banana input jacks
Limit Operation
The limit operation lets you set and control the
values that determine a HI / IN / LO status of
subsequent measurements. The meter can be
configured to emit an audible alarm when
readings are outside of the configured limit.
Increase Productivity with PC
Connectivity
The 2831E and 5491B are programmable via
USB and RS232 (5491B only) interface using
industry standard SCPI commands. Users can
control and configure the instrument from a
remote PC and retrieve measurement results for
further analysis. The meters can also be remotely
controlled using application software (downloadable from the B&K website), which supports front
panel emulation and data logging of
measurement results.
Rear panel
RS232 Interface
(5491B)
Durable rubber bumpers for
added protection and ability
to stack multiple instruments
USB communication
interface
Front panel fuse
compartment for
easy fuse
replacement
Earth ground
connection
AC receptacle protected with
110/220V selectable line fuse
Application software screenshot
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True RMS Bench Multimeters
odels 2831E and 5491B
M
Specifications
DC Voltage
esolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
R
Ra te Ra nge Re sol u tio n
00.00 mV
2
.0000 V 100 µV 2.1000 0.03%+0.05% (1) >11.1 MΩ
2
0.000 V
Slo w
2831E5491B2831E5491B
Slo w
(1) under REL status
(2) 1% over-range (1010 V) is readable at 1000 V range
2
200.00 V 10 mV 210.00 0.03%+0.06% 10 MΩ
1000.0 V 100 mV 1010.0 (2) 0.03%+0.06% 10 MΩ
00.00 mV
5
5.0000 V 100 µV 5.1000 0.02%+0.008% (1) >11.1 MΩ
50.000 V 1 mV 51.000 0.02%+0.008% >10.1 MΩ
500.00 V 10 mV 510.00 0.02%+0.008% 10 MΩ
000.0 V
1
0 µV
1
1
0 µV
1
00 mV
1
mV
AC Voltage
esolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
R
Ra te R a nge R e sol uti on
200.00 mV 10 µV 210.00 1.0%+0.2%) 0.5%+0.15% 1.8% + 0.25% 3.0% + 0.75%
2.0000 V 100 µV 2.1000 1.0%+0.2%) 0.4%+0.05%
Slow
2831E5491B
Slow
Max. crest factor: 3.0 at full scale
(1) Specifications are for sine wave inputs >5% of range.
(2) Limit at 40 kHz or ≤ 3×107 Volt-Hz for 750 V range
(3) 1% over-range (757.50V) is readable at 750V range
20.000 V 1 mV 21.000 1.0%+0.2% 0.4%+0.05% 1.5% + 0.1% 3.0% + 0.25%
200.00 V 10 mV 210.00 ---- 0.8%+0.075%
750.0 V 100 mV 757.5(3) ---- 0.8%+0.075% 1.5% + 0.1% (2) 3.0% + 0.25% (2)
500.00 mV 10 µV 510.00 1.0%+0.08%) 0.5%+0.06% 1.5% + 0.1% 3.0% + 0.3%
5.0000 V 100 µV 5.1000 1.0%+0.08%) 0.35%+0.02% 1% + 0.04% 3.0% + 0.1%
50.000 V 1 mV 51.000 1.0%+0.08% 0.35%+0.02% 1% + 0.04% 3.0% + 0.1%
500.00 V 10 mV 510.00 ---- 0.5%+0.03% 1% + 0.04% 3.0% + 0.1%
750.0 V 100 mV 757.5(3) ---- 0.5%+0.03% 1% + 0.04% (2) 3.0% + 0.1% (2)
Fu l l Sca le
Re adi n g
10.00
2
1.000
2
10.00
5
010.0 (2)
1
Ful l S ca le
Re a ding
Ac curac y
(1 yea r )
.03%+0.08% (1)
0
.03%+0.06%
0
.02%+0.016% (1)
0
.02%+0.008%
0
20 ~50 H z 50~2 0 kH z 2 0~50 kHz 50 ~10 0 k Hz
Typ ical Inpu t
Imp e danc e
10 MΩ
>
10.1 MΩ
>
10 MΩ
>
0 MΩ
1
Ac c urac y ( 1 ye ar) (1) 2 3 °C ± 5 °C
1.5% + 0.1% 3.0% + 0.25%
1.5% + 0.1% 3.0% + 0.25%
DC Current
Resolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
Ra te R a n ge R e sol u t i on
2.0000 mA 0.1 µA 2.1000 0.08%+0.025% (2)
20.000 mA 1 µA 21.000 0.08%+0.02% (2)
Slow
Slow
(1) Typical voltage across the input terminals at full scale reading.
(2) Use REL function
(3) In 20 A range, >10~20 ADC is readable for 20 seconds maximum
200.00 mA 10 µA 210.00 0.08%+0.02%
2.0000 A 100 µA 2.1000 0.3%+0.025%
20.000 A 1 mA 21.000 (3) 0.3%+0.025%
5.0000 mA 0.1 µA 5.1000 0.05%+0.01% (2)
50.000 mA 1 µA 51.000 0.05%+0.008% (2)
500.00 mA 10 µA 510.00 0.05%+0.008%
5.0000 A 100 µA 5.1000 0.25%+0.01%
20.000 A 1 mA 21.000 (3) 0.25%+0.01%
Fu l l Sca le
Re adi n g
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Ac c urac y
(1 year )
Bur d en Vo lta g e (1)
& Shunt R e sis t o r
<0.3 V / 100 Ω
<0.04 V / 1 Ω
<0.3 V / 1 Ω
<0.05 V / 10 mΩ
<0.6 V / 10 mΩ
<0.6 V / 100 Ω
<0.06 V / 1 Ω
<0.6 V / 1 Ω
<0.1 V / 10 mΩ
<0.6 V / 10 mΩ
True RMS Bench Multimeters
odels 2831E and 5491B
M
Specifications (cont.)
AC Current (True RMS, AC Coupling)
Resolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
Ra te R an ge R eso lutio n
.0000 mA
2
20.000 mA 10 µA 21.000 1.5%+0.5% 0.5%+0.3%
00.00 m A
Slo w
2831E
Slo w
5491B2831E5491B
Max. crest factor: 3.0 at full scale
(1) Specifications are for sine wave inputs >5% of range.
(2) In 20 A range,>10~20 A AC is readable for 20 seconds maximum
2
2.0000 A 1 mA 2.1000 2.0%+0.5% 0.5%+0.3%
0.000 A
2
5.0000 mA 0.1 µA 5.1000 1.5%+0.16% 0.5%+0.08% 2%+0.16%
50.000 mA 10 µA 51.000 1.5%+0.16% 0.5%+0.08% 2%+0.12%
500.00 m A 100 µA 510.00 1.5%+0.16% 0.5%+0.08% 2%+0.12%
5.0000 A 1 mA 5.1000 2.0%+0.16% 0.5%+0.1% ----
0.000 A 10 mA 21.000 (2) 2.0%+0.16% 0.5%+0.1% ----
2
.1 µA
0
00 µA
1
0 mA
1
Full S c ale
Re adi n g
.1000
2
10.00
2
1.000 (2)
2
Ac curac y ( 1 ye ar) (1) 2 3 °C ± 5 °C
20 ~50 Hz 50 ~2 kHz
.5%+0.5%
1
.5%+0.5%
1
.0%+0.5%
2
.5%+0.3%
0
.5%+0.3%
0
.5%+0.3%
0
2~ 2 0 k Hz
%+0.5%
2
2%+0.38%
%+0.38%
2
----
---
-
Resistance
Resolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
Ra te R a nge (1) Res o l utio n
200.00 Ω 10 mΩ 210.00 0.5 mA 0.10%+0.05% (2)
2.0000 kΩ 100 mΩ 2.1000 0.45 mA 0.10%+0.025% (2)
Slow
2831E
Slow
5491B
(1) In order to eliminate the noise interference, which might be induced to the test leads, it is recommended to use a shielded test cable
for measuring resistance above 100 kΩ.
(2) Using REL function
20.000 kΩ 1 Ω 21.000 45 µA 0.10%+0.025% (2)
200.00 kΩ 10 Ω 210.00 4.5 µA 0.10%+0.025%
2.0000 MΩ 100 Ω 2.1000 450 nA 0.15%+0.025%
20.000 MΩ 1 kΩ 21.000 45 nA 0.3%+0.05%
500.00 Ω 10 mΩ 510.00 0.5 mA 0.10%+0.01% (2)
5.0000 kΩ 100 mΩ 5.1000 0.45 mA 0.10%+0.008% (2)
50.000 kΩ 1 Ω 51.000 45 µA 0.10%+0.008% (2)
500.00 kΩ 10 Ω 510.00 4.5 µA 0.10%+0.008%
5.0000 MΩ 100 Ω 5.1000 450 nA 0.15%+0.008%
50.000 MΩ 1 kΩ 51.000 45 nA 0.3%+0.01%
Ful l S cale
Re a d ing Te st c urre n t
Acc urac y
(1 yea r )
Continuity
Resolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
Ra nge
Re solu tio n
Fu l l Sca le
Re adi n g T est cur rent
Ac curac y ( 1 yea r)
23 º C ± 5ºC
200 Ω 100 mΩ 999.9 0.5 mA 0.1%+0.1%
500 Ω 100 mΩ 999.9 0.5 mA 0.1%+0.04%
Open circuit voltage: <5.5 VDC
Test current: around 0.5 mA DC
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True RMS Bench Multimeters
odels 2831E and 5491B
M
Specifications (cont.)
Diode
esolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
R
Ra te
Med 2.0000 V 100 µV 2.3000 V 0.5 mA (Approx.)
Ran g e Re s o lut ion
Frequency
esolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
R
AC V
Ra nge
00 mV
2
500 mV*)
(
o 750V
t
* Model 5491B
Fr e quen c y
Ra n g e
0 Hz
1
10~100 Hz 1 mHz 99.999 0.01%+0.02% 300 mV rms
00~100 kHz
1
00k~1 MHz
1
Be st
Re sol u tion
00 µHz
1
0 mHz
1
0 Hz
1
Full S c ale
Re a d ing A c c ura cy
.9999
9
99.99
9
99.99
9
Ful l S c al e
Re a d ing Test cu rren t
.05%+0.02%
0
.01%+0.008%
0
.01%+0.008%
0
In put Se n s i tiv i ty
(S ine Wave )
00 mV rms
2
00 mV rms
3
500 mV rms
Period
Resolution, Full Scale Reading and Accuracy ± (% of reading + % of range), 23 °C ± 5 °C
AC V
Ra nge
200 mV
(500 mV*)
to 750V
* Model 5491B
Fr e quen c y
Ra n g e
1~10 µs 0.1 ns 9.9999 0.01%+0.008% 500 mV rms
10 µs~10 ms 1 ns 9.9999 0.01%+0.008% 300 mV rms
10 ms~100 ms 1 µs 99.999 0.01%+0.02% 300 mV rms
100 ms 10 µs 199.99 0.05%+0.02% 200 mV rms
Be st
Re sol u tion
Full S c ale
Re a d ing A c c ura cy
General
AC Inpu t
110/220 V ± 10%,
50/60 Hz ± 5%
Included Accessories
Po w e r
Co nsu mptio n
≤ 10VA
Op era tin g
En v iro nme n t
0 °C to 40 °C,
≤ 90 %RH
St ora ge
En vir o nmen t Warm -up Dim e nsi ons (W× H×D ) Ne t Weig ht
-40 °C to 70 °C at least 30 minutes
One-Year Warranty (2831E), Three-Year Warranty (5491B)
Test leads, Power cord, Spare fuse, Operation Manual , Calibration certificate and test report
In put Se n s i tiv i ty
(S ine Wave )
225 mm×100 mm×355 mm
8.85” x 3.93 “ x 13.97”
2.5 kg
5.51 lbs
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