Multimeter UNI-T UT18B PRO

The UT18B PRO 1000 V True RMS digital multimeter is a highly reliable, safe and durable multimeter that measures true RMS values, also intended for measurement in CAT II 1000 V / CAT III 600 V distribution equipment. The UT18B PRO True RMS digital multimeter can accurately measure imperfect, non-linear AC voltage waves, such as those produced by voltage converters, and thanks to the built-in VFC mode, this meter can remove the interfering voltage signal, resulting in a more accurate voltage reading.
The ranges of the UT18B PRO device can be switched automatically or manually. The maximum displayable value of the LCD display is 6200. The fast analog-to-digital converter (ADC) measures up to 3 times per second.
The UT18B PRO measuring instrument enables the measurement of AC/DC voltages and currents, resistance, capacitance, frequency, duty cycle and temperature. Can also be used in an environment with an electric field of up to 1V/m.
The μA and mA current range is protected by a fast-acting fuse FF440 mA / H 1000 V, ø10 x 38mm CE with a breaking capacity of 20kA, and a current range of 10A is protected by a fast-acting fuse FF11A / H 1000V ø10 x 38mm CE with a breaking capacity of 20kA. The voltage inputs are protected against voltage peaks greater than 1000V.
Compared to the UT17B PRO multimeter, the UT18B PRO differs by a different design of test cables, a larger frequency measurement range (up to 1MHz) and capacitance (up to 6mF) and also allows you to measure most different types of LEDs with a voltage of up to 12V.
The built-in LED flashlight on the back of the device and automatic backlighting of the display allow users to easily solve problems with electrical equipment even in a dark environment.
It is powered by two pieces of AA R6 1.5V pencil batteries and the device automatically switches off after 15 minutes of inactivity.


Product parameters :

- the device has double insulation
- classified as CAT II 1000V and CAT III 600V
- HTN type LCD display with a maximum display of 6200
- automatic backlighting of the display with an ambient light sensor
- refresh rate for most measurements 3x per second
- setting ranges automatically or manually
- automatic polarity indication
- measuring ranges of AC voltage (alternating current):

600 mV to 1000 V
- measuring ranges of AC current (alternating current):

600 μA to 10 A
- measuring ranges of DC voltage (direct current):


600 mV to 1000 V
- measuring ranges of DC current (direct current):


600 μA to 10 A
- resistance measurement ranges of resistors:


600 Ω to 60 MΩ
- measuring ranges of capacitor capacity:



6,000 nF to 6,000 mF
- frequency measurement range:



10 kHz to 1 MHz
- duty cycle measurement range:



1% to 99.9%
- temperature measurement range with supplied K-type thermocouple:
-55 °C to 230 °C
- high accuracy
- TRMS, measurement of the effective voltage values of st. voltages and currents
- relative measurement mode
- MAX/MIN mode
- VFC filter against interference
- protection of inputs against overload with voltage greater than 1000V
- protection of surge inputs with fast fuses
- input impedance on mV range ≥ 3GΩ, on other voltage ranges 10MΩ
- test of diodes and semiconductor transitions with a voltage of 0 to approx. 3V, test current 1.2mA,
- LED diode test with a voltage of 0 to 12V, test current 1.2mA, no-load voltage max. 30V
- power supply 2 pcs R6 1.5V batteries
- low battery indication
- automatic shutdown (sleep when idle)
- LED light on the bottom
- measurement in elmag is also possible. fields with an intensity of 1V/m with an additional error of 5%


Technical parameters :

(accuracy is defined at a temperature of 23°C ±5°C and relative humidity ≤75%)

- DC voltage measurement (input impedance is in the range of mV ≥3GΩ, in other ranges 10MΩ):
(range / resolution / accuracy)
600.0mV / 0.1mV / ± (0.5% + 3)
6.000V / 0.001V / ± (0.5% + 3)
60.00V / 0.01V / ± (0.5% + 3)
600.0V / 0.1V / ± (0.5% + 3)
1000, V / 1V / ± (0.5% + 3)

- AC voltage measurement (input impedance approx. 10MΩ, 40Hz to 500Hz):
( range / resolution / accuracy )
600.0mV / 0.1mV / ± (1% + 3)
6.000 V / 0.001 V / ± (1% + 3)
60.00V / 0.01V / ± (1% + 3)
600.0V / 0.1V / ± (1% + 3)
1000.0V / 1V / ± (1% + 3)
V.F.C. 600.0V / 0.1V 0.001 / ± (4.0% +10); (40Hz to 400Hz)

- DC current measurement:
( range / resolution / accuracy )
600.0 μA / 0.1 μA / ± 0.8% + 3
6000 μA / 1 μA / ± 0.8% + 3
60.00mA / 0.01mA / ± 0.8% + 3
600.0mA / 0.1mA / ± 0.8% + 3
6.000A / 0.001A / ± 1.2% + 5
10,000A / 0.01A / ± 1.2% + 5

- AC current measurement (40Hz to 500Hz):
( range / resolution / accuracy )
600.0 μA / 0.1 μA / ± (1.0% + 3)
6000 μA / 1 μA / ± (1.0% + 3)
60.00mA / 0.01mA / ± (1.0% + 3)
600.0mA / 0.1mA / ± (1.0% + 3)
6.000A / 0.001A / ± (1.5% + 3)
10.00A / 0.01A / ± (1.5% + 3)

- resistance measurement:
( range / resolution / accuracy )
600.0 Ω / 0.1 Ω / ± (0.5% + 2)
6,000 kΩ / 1 Ω / ± (0.5% + 2)
60.00 kΩ / 10 Ω / ± (0.5% + 2)
600.0 kΩ / 100 Ω / ± (0.5% + 2)
6,000 MΩ / 1 kΩ / ± (0.5% + 2)
60.00 MΩ / 10 kΩ / ± (2.0% + 5)


- measurement of capacitor capacity:
( range / resolution / accuracy )
60.00 nF / 0.01 nF / in REL mode: ± (4.0% + 8)
600.0 nF / 0.1 nF / ± 2.0% + 5
6.000 μF / 0.001 μF / ± 2.0% + 5
60.0μF / 0.01μF / ± 2.0% + 5
600.0μF / 0.1μF / ± 2.0% + 5
6,000 F / 1 µF / ( ≤ 1000µF) / ± (5.0% + 5)
6,000 F / 1 µF / ( ≥ 1000µF) / ± (10.0% )
overload protection: 1000V – PTC
If the measured capacitance is ≤ 600 nF, REL mode is recommended to ensure accuracy.


- measurement of diodes and semiconductor transitions:


open circuit voltage: 3.0V


test current: approx. 1.2 mA)


the normal voltage drop across the silicon junction is 0.500 to 0.800mV


voltage resolution during this measurement: 0.001V


- measurement of circuit continuity:


if the line resistance is >50 Ω, an interruption is indicated, the buzzer does not beep


when line resistance ≤10 Ω, an unbroken circuit is indicated, the buzzer beeps continuously


overload protection: 1000V

- measurement of frequency, duty cycle:
( range / resolution / accuracy )
10 kHz to 1 MHz / 0.01 kHz to 0.001 MHz / ± (0.1% + 3)

1.0% to 99.9% / 0.1% / ± (1.0% + 4)
duty cycle measurement is only suitable for square waves up to 1kHz with an amplitude of 100mVrms to 30Vrms


- temperature measurement: -55°C to 500°C (-67°F to 932°F)
( range / resolution / accuracy )
-55°C to 0°C / 0.1°C / ±(6.0% + 2°C)
0°C to 50°C / 0.1°C / ±2°C
50°C to 500°C / 0.1°C / ± (2.0% +1°C)

( range / resolution / accuracy )
-67°F to 32°F / 1°F / ±(10.0% + 2°F)
32°F to 122°F / 1°F / ±4°F
122°F to 932°F / 1°F / ± (4.0% +4°F)


- fuse range 10A:







fuse FF 11A H/1000V (10 x 38mm) CE
- protection of the mA/µA range:





fuse FF 440mA H/1000V (10 x 38mm) CE
- device coverage:







not defined
- device dimensions:






195 x 95 x 58 mm
- weight:








approx. 484.5 g (including batteries)
- working temperature:






0°C to 40°C
- working relative humidity:






at 0°C to 30°C ≤ 75%, at 30°C to 40°C ≤ 50%
- working altitude:







0 to 2000 m
- storage temperature:






-10°C to 50°C
- the device meets the standards:





CE, UKCA, cETLus, CAT II 1000V, CAT III 600V, double insulation, protection against voltage overload ≥ 1000V, EN 61326-1:2013; EN 61326-2-2:2013, EN 61010-1:2010; EN 61010-2-030:2010; EN 61010-2-033:2012. Complies with UL STD.: 61010-1, 61010-2-030. Certified according to CSA STD. C22.2 No. 61010-1, 61010-2-030, 61010-2-033.


Contents of individual packaging :

- multimeter UT17B PRO with storage case:




1 pc
- test cables with spikes in category CAT II 1000V, CAT III 600V:



1 pair
- K-type thermocouple (nickel/chromium-nickel/silicon) up to temperatures of +230°C:
1 pc
- fuse F1, FF 440 mA H 1000 V (10 x 38mm) - in the device:



1pc
- fuse F2, FF 11 A H 1000 V (10 x 38mm) - in the device:



1pc
- user manual:







1 pc


Commercial packaging :

- carton dimensions:






480 x 370 x 195 mm
- standard quantity in a carton:






10 pcs
- total weight of the carton:






approx. 9.1 kg

- Manufacturer: UNI-TREND
- www.uni-t.cz