● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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Professional manual-range multimeter featuring 6000-count resolution, True RMS measurement, and a specialized LED test function for precise electronics diagnostics.
High-resolution diagnostics with specialized LED analytical power. The UNI-T UT89XD is a versatile 6000-count digital multimeter engineered for technicians who need reliable measurements for modern lighting and electronic systems. Utilizing True RMS technology, this meter delivers highly accurate results even when measuring distorted AC waveforms common in modern switching power supplies and LED driver circuits.
Advanced Field and Lab Capabilities The UT89XD stands out with its dedicated LED test function, which allows users to test the functionality and measure the forward voltage drop of LEDs directly. It is highly effective for HVAC and electrical maintenance due to its integrated Non-Contact Voltage (NCV) detector, which features dual sensitivity modes to identify live circuits behind walls or in outlets safely. For work in dimly lit environments, the meter includes a powerful built-in flashlight and a large backlit LCD display.
Display Count: 6000 Counts with clear LCD
Measurement Type: True RMS
Safety Ratings: CAT II 1000V / CAT III 600V
Special Functions: LED Test Mode, NCV (Non-Contact Voltage), hFE Transistor Testing, Flashlight
Measurement Modes: AC/DC Voltage & Current, Resistance, Frequency, Capacitance, Temperature, Diode/Continuity
Protection: Fully fused inputs with a rugged double-injection molded housing
LED System Repair: Testing individual light-emitting diodes and verifying driver outputs using the specialized LED mode.
Electronics Maintenance: Measuring large filter capacitors in power supplies using the high-capacity 100mF range.
Electrical Safety Checks: Identifying live wires and voltage presence without physical contact using the NCV function.
Unlock New Capabilities (Project Evolution)
Diagnostic Upgrade: Replace standard multimeters with this device to gain the ability to test high-voltage LED arrays that standard diode testers cannot power.
Field Efficiency: Use the integrated flashlight and data hold functions to work hands-free in tight electrical cabinets where lighting is poor.
Downloads:
Package Includes:
1 x UNI-T UT89XD Digital Multimeter
1 x Pair of High-Quality Professional Test Leads
1 x Point Contact Temperature Probe (Thermocouple)
1 x Operating Manual
What is the difference between the UT89XD and the UT89X? The UT89XD features a specialized LED test function, while the UT89X typically includes a thermal measurement mode or live wire detection.
How do I test an LED with this meter? Switch the dial to the LED/Diode position and use the SEL button to select the LED test mode; the meter will apply sufficient voltage to light up the LED and show its voltage drop.
What is the benefit of a 6000-count display? It offers higher resolution than standard 2000-count meters, allowing you to see smaller changes in values (e.g., 5.999V instead of 5.99V).
Does the NCV feature have an alarm? Yes, it provides both audible and visual (LED) indicators when AC voltage is detected.
Can it measure transistor gain? Yes, it includes a dedicated hFE test socket for measuring the gain of NPN and PNP transistors.
Is it a True RMS multimeter? Yes, it uses True RMS to provide accurate measurements of non-linear AC signals.
What batteries does it require? It uses 4x standard 1.5V AAA batteries.
What is the maximum capacitance it can measure? It features an exceptionally high capacitance range of up to 100mF (100,000 uF).
What is the maximum current it can measure? It is rated for up to 20A AC/DC current measurement (fused).
Does it have a backlight? Yes, it features a clear backlit LCD for working in dark environments.
What is the purpose of the REL button? It allows you to zero out lead resistance for more accurate low-resistance or capacitance measurements.
Is it safe for industrial power work? Yes, it carries professional CAT II 1000V and CAT III 600V safety certifications.
What is the update speed? The high-resolution display updates approximately 3 times per second.
Does it have an auto-power off? Yes, it includes an auto-off feature to conserve battery life during long tasks.
Does it measure temperature? Yes, it includes a temperature measurement mode and supports Celsius/Fahrenheit ranges.
Is the housing durable? Yes, it is built with a double-injection molded shell designed to withstand drops and professional field use.
What is the frequency range? It can measure signals typically up to 10MHz.
Does it have a built-in light? Yes, it features a rear-mounted flashlight for illuminating the measurement area.
What color is the housing? It features the signature professional UNI-T red and black rugged housing.
Is this suitable for beginner hobbyists? While offering professional features, its clear labeling and manual ranging make it an excellent learning tool for advanced hobbyists and students.
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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