Fluke 18B+ Digital Multimeter

Use the Fluke 18B+ digital multimeter to inspect and test most electronic product issues. This meter is easy to use and offers significant improvements compared to the original Fluke 18B. It is suitable for anyone working in electronics repair or manufacturing setups. Whether you have always wanted a Fluke digital multimeter or have been looking for a reason to upgrade, the Fluke 18B+ will meet your needs.

Key Features

600 V Cat III safety design rating
50% larger display range and a bright white backlight
Smart LED test illuminates LEDs (regardless of polarity), allowing you to test LEDs in two modes:
- DMM LED socket test mode
- LED test mode on UUT (PCBA) using test leads
Voltage, resistance, current, and capacitance measurements
Diode test and data hold
Frequency and duty cycle
AC and DC current measurement up to 10A at the input terminals

Specs

Accuracy is maintained for 1 year after calibration, with an operating temperature from 18 °C to 28 °C and relative humidity from 0% to 75%. The form of the accuracy specification is as follows: ±([Reading %] + [Least Significant Digits]).

Function	Range	Resolution	Accuracy
AC Voltage (40 Hz to 500 Hz)¹	4.000 V 40.00 V 400.0 V 1000 V	0.001 V 0.01 V 0.1 V 1 V	1.0 % + 3
DC Voltage	4.000 V 40.00 V 400.0 V 1000 V	0.001 V 0.01 V 0.1 V 1 V	0.5 % + 3
AC Voltage (mV)	400.0 mV	0.1 mV	3.0 % + 3
DC Voltage (mV)	400.0 mV	0.1 mV	1.0 % + 10
Diode Test²	2.000 V	0.001 V	10%
Resistance (Ohms)	400.0 Ω 4.000 kΩ 40.00 kΩ 400.0 kΩ 4.000 MΩ 40.00 MΩ	0.1 Ω 0.001 kΩ 0.01 kΩ 0.1 kΩ 0.001 MΩ 0.01 MΩ	0.5 % + 3 0.5 % + 2 0.5 % + 2 0.5 % + 2 0.5 % + 2 1.5% + 3
Capacitance³	40.00 nF 400.0 nF 4.000 μF 40.00 μF 400.0 μF 1000 μF	0.01 nF 0.1 nF 0.001 μF 0.01 μF 0.1 μF 1 μF	2 % + 5 2 % + 5 5 % + 5 5 % + 5 5 % + 5 5 % + 5
Frequency¹ Hz (10 Hz – 100 kHz)	50.00 Hz 500.0 Hz 5.000 kHz 50.00 kHz 100.0 kHz	0.01 Hz 0.1 Hz 0.001 kHz 0.01 kHz 0.1 kHz	0.1 % + 3
Duty Cycle¹	1 % to 99 %	0.1 %	1 % typical⁴
AC Current μA (40 Hz to 400 Hz)	400.0 μA 4000 μA	0.1 μA 1 μA	1.5 % + 3
AC Current mA (40 Hz to 400 Hz)	40.00 mA 400.0 mA	0.01 mA 0.1 mA	1.5 % + 3
AC Current A (40 Hz to 400 Hz)	4.000 A 10.00 A	0.001 A 0.01 A	1.5 % + 3
DC Current μA	400.0 μA 4000 μA	0.1 μA 1 μA	1.5 % + 3
DC Current mA	40.00 mA 400.0 mA	0.01 mA 0.1 mA	1.5 % + 3
DC Current A	4.000 A 10.00 A	0.001 A 0.01 A	1.5 % + 3
¹ All current, frequency, and duty cycle ranges are from 1% to 100% of the range. Inputs below 1% of the range are not specified. ² Typically, the open-circuit test voltage is 2.0 V, and the short-circuit current is <0.6 mA. ³ The specification does not include errors caused by test leads and capacitance board. (At the 40 nF range, the maximum possible error is 1.5 nF.) ⁴ “Typical” means at 50 Hz or 60 Hz, with duty cycle between 10% and 90%.

Function	Emission Range	Measurement Range	Resolution	Accuracy
LED VF Test ¹ (LED Test Socket)	1.00 to 6.00 V	NA	NA	NA
LED VF Test ² (Test Leads)	1.00 to 6.00 V	1.00 to 6.00 V	0.01 V	10 % ³
Continuity Threshold	Not applicable	Not applicable	Not applicable	70 Ω
¹ The open-circuit test voltage is ±12 V, and the short-circuit current is >±5 mA (typical). ² The open-circuit test voltage is ±12 V, and the short-circuit current is >±3 mA (typical). ³ VF measurement with a driving current below 2.2 ±0.4 mA.

Function	Overload Protection	Input Impedance (Nominal)	Common-Mode Rejection Ratio	Normal-Mode Rejection Ratio
AC Voltage	1000 V ¹	>10 MΩ <100 pF	Under DC current, >60 dB at 50 Hz or 60 Hz	-
AC Voltage (mV)	400 mV	>1MΩ, <100 pF	>80 dB at 50 Hz or 60 Hz	-
DC Voltage	1000 V ¹	>10 MΩ <100 pF	Under DC current, >100 dB at 50 Hz or 60 Hz	>60 dB at 50 Hz or 60 Hz
DC Voltage (mV)	400 mV	>1MΩ, <100 pF	>80 dB at 50 Hz or 60 Hz	-
¹ 10⁶ V·Hz maximum

General Specifications
Maximum Voltage Between Any Terminal and Ground	1000 V
Display (LCD)	4000 counts, updates 3 times per second
Battery Type	2 AA, NEDA 15A, IEC LR6
Battery Life	At least 500 hours (50 hours in LED test mode with no load. Under load, battery life depends on the type of LED being tested.)
Temperature
Operating Temperature	0 °C to 40 °C
Storage Temperature	-30 °C to 60 °C
Relative Humidity
Operating Humidity	Non-condensing (<10 °C). ≤90% RH at 10 °C to 30 °C; ≤75% at 30 °C to 40 °C
Operating Humidity	For the 40 MΩ range: ≤80% RH at 10 °C to 30 °C; ≤70% RH at 30 °C to 40 °C
Altitude
Operating Altitude	2000 m
Storage Altitude	12,000 m
Temperature Coefficient	0.1 × (specified accuracy) /°C (<18 °C or >28 °C)
Fuse Protection for Current Inputs	440 mA, 1000 V fast-blow, Fluke-specified part only. 11 A, 1000 V fast-blow, Fluke-specified part only.
Dimensions (H × W × L)	183 × 91 × 49.5 mm
Weight	455 g
IP Rating	IP 40
Safety	IEC 61010-1, IEC61010-2-030 600 V CAT III, 1000 V CAT II, Pollution Degree 2
Electromagnetic Environment	IEC 61326-1: Portable
Electromagnetic Compatibility	Applicable only in Korea
Class A equipment (industrial broadcasting and communication equipment)¹ ¹ This product meets the requirements for industrial (Class A) electromagnetic wave equipment, and the seller or user should be aware of this. It is intended for use in commercial environments and not for residential use.

Frequently Asked Questions

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