Step 4: (Collector to Base) Hook the positive lead from the multimeter to the to the COLLECTOR (C) of the transistor. 1 ohm-50M ohm Operating Mode: Manual Measuring Inductance Range: 0. In the context of a multimeter, the hFE function allows you to test and Transistor Tester Component Tester/Soldering Kit Circuit Board, Meter Tester Diode Capacitor ESR Voltage Frequency Meter Square Wave Signal Generator. wisTek is another reliable brand that manufactures transistor testers and related testing tools with useful features. 6 out of 5 stars 23 1 offer from $22. In the TME catalogue, set the "transistor test" filter in the "portable digital multimeters" product category. Set the multimeter to the resistance mode (ohmmeter). The M328 Transistor Tester. The CEM DT9935 LCR meter wil Feb 6, 2009 · Cen-Tech Multimeter Digital Volt Ohm Am Meter 7-Function Volt Amp Meter NIP (New in Package) • Get Accurate readings for DC voltage, DC Current, AC voltage resistance, transistor test, diode test and battery test this little multi tester does it all. The Q1 is a PNP transistor and the constant current Jul 17, 2018 · A Digital Multimeter is the most important tool when it comes to electronics. Buy a real transistor tester, if you need one. The voltage drop on the multimeter should be approximately 0. Nov 29, 2021 · In this video tutorial we will guide you to learn how to check transistor is working or not using multimeter👉 Also Check out our other Multimeter Tutoria Feb 11, 2023 · My Facebook Group to help you solve your laptop motherboard faults:https://www. The FET is a three-terminal device such as source, gate, and drain. For this test, you can view the transistor as two diodes connected as shown in Below Figure for both npn and pnp transistors. Dec 23, 2021 · Transistor Meter, Aideepen LCR-TC1 Multi-Function Capacitance Resistance ESR Tester 1. Rs. My Facebook Group to help you solve your laptop motherboard faults:https://www. May 29, 2020 · Simple – some multimeters, all “cheap component testers” and the purpose-built testers with digital graphical displays will run a gain test at an arbitrary voltage and display a result (e. A digital multimeter is used to test the base to emitter and base to collector PN junction of the BJT. One side of the diode junction should read a very high resistance, above 1MΩ of resistance (the anode-to-cathode side) and the other side should read a much Oct 27, 2021 · DROK Transistor Tester, Mosfet Transistor Capacitor Tester, Mega328 NPN PNP Transistor Diode Resistor Inductor Capacitance MOS SCR ESR Meter Automatic Checker Detector 4. It is a measure of how much the current amplifies as it passes through a transistor. Place DMM into diode check mode so enough current can be supplied to transistor legs under test for forward voltage junction readings. MULTIMETER KIT: A safe and accurate voltage tester for troubleshooting electrical problems in automotive and household settings. EDIT: When I talk about transistor gain with other engineer's, we often use the term 'beta', yet in a datasheet 'hFE' is normally what is used by the manufacture based on calibrated equipment for a standalone transistor. prospace20. Set your Analog Multimeter to Ohmmeter X1 Ohm Scale. For a properly functioning NPN transistor, your digital multimeter should read a voltage drop of around 0. ) in the other direction. 30 In Stock: 1: $49. With ProTechTrader’s PDM-631 you will be able to measure direct and alternating current, resistance, diodes, transistors, continuity, and square wave test signals, all in the palm of your hand! HILTEX 40508 Digital Multimeter Diode & Transistor Tester AC DC Volt Test Voltmeter, Automotive Multimeter Meter Tester, Measure Voltage Test, Car Battery Tester, Analog Multimeter Kit, Volt Meter (4. 1 Ohm - 20 MOhm), tests many different types of transistors such as NPN, PNP, FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. Sep 25, 2023 · Conclusion. Only 8 left in stock - order soon. ANENG SZ02 Smart Digital Multimeter 6000 Counts True RMS Auto Electrical Capacitance Meter Temp Resistance Transistor Testers. (i) The forward biased base-emitter junction (biased by internal supply) should read a low resistance, typically 100 to 1 k as shown in Fig. MOSFET (also known as FET) is short for Metal Oxide Semiconductor Field Effect Transistor. AUTOMATICAL IDENTIFICATION: Transistor checker is able to detect Jun 13, 2022 · 1. “hFE 493”). Jan 5, 2019 · HiLetgo LCR-T7 Transistor Tester TFT Diode Triode Capacitance Meter LCR Meter NPN PNP MOSFET IR Multifunction Tester Multimeter 3. Dec 26, 2023 · Step 3: Test the mosfet for a short circuit. 00 ESR Meter kit is an amazing multimeter that measures ESR values, capacitance (100pF - 20,000uF), inductance, resistance (0. $599. Look for 20V and turn the knob to select. 3 out of 5 stars 1,705 Mar 21, 2024 · 3. 4) 4. Description: Transistor tester can automatically test the pins of a component and display on the LCD. 57. “HFE” on a multimeter stands for “heterojunction bipolar transistor (HBT) forward current transfer ratio,” which is more commonly referred to as “current gain. Jul 14, 2021 · DROK Transistor Tester, Mosfet Transistor Capacitor Tester, Mega328 NPN PNP Transistor Diode Resistor Inductor Capacitance MOS SCR ESR Meter Automatic Checker Detector 4. But for traditional volts, milliamps, and resistance measurements, this is an impressive meter for the price. 99. 4 out of 5 stars 998 1 offer from $2399 $ 23 99 Apr 11, 2023 · Test MOSFET out-of-circuit: To determine if a MOSFET is operating correctly, try disconnecting it from the circuit and testing with either a specialized tester or a multimeter. 4 out of 5 stars 994 1 offer from $39. Connect the multimeter's positive lead (red probe) to the collector pin (C) of the IGBT. 4 out of 5 stars 997 1 offer from $36. Connecting Base to the collector. Seller's other items. Diodes, transistors, and other types of semiconductors are based on the “PN” junction, which allows current to flow Find helpful customer reviews and review ratings for Neiko HILTEX 40508 Digital Multimeter Diode & Transistor Tester AC DC Volt Test Voltmeter, Automotive Multimeter Meter Tester, Car Battery Tester, Analog Multimeter Kit, Volt Meter, Black at Amazon. and how to tell if it is a PNP or NPN and find the Base. 99 Jan 19, 2022 · In this video tutorial, we will explain what is hfe in multimeter and how to use hfe mode in multimeter----- 2. 5v/9v/12v Battery Voltage Tester Measure Voltage Current Resistance Diodes Continuity Capacitance with NCV 4. $3497. In summary, the TC1 component tester (Amazon Link) is very easy to use and can be a good testing tool for your lab and projects. 4,599. May 11, 2022 · The hFE on a multimeter is a ratio that measures the voltage increase or decrease between two points in other words ‘the hFE value on a multimeter indicates how much current the transistor can handle before it starts to heat up and break down. 98 $ 49 . KOOKYE Mega328 Transistor Tester Diode Triode Capacitance ESR Meter. My question is that, STEP 3 (Emitter to Base) failed to show “OL” (Over Limit). Jun 18, 2019 · DROK Transistor Tester, Mosfet Transistor Capacitor Tester, Mega328 NPN PNP Transistor Diode Resistor Inductor Capacitance MOS SCR ESR Meter Automatic Checker Detector 4. com. Automated detection of pin assignment, this means the device-under-test can be connected to the tester in any order. Disconnect the IGBT from the circuit or device. If the previous method doesn’t work, place the three legs of the Transistor in the B-C-E formation. facebook. 1. The circuit is based on two constant current sources build around transistors Q1 and Q2. 7 volts if the transistor is functioning correctly. Readings outside of these ranges indicate likely failed components. Apr 24, 2015 · Two days later I had a “SainSmart Mega328 Transistor Tester Diode Triode Capacitance ESR Meter MOS/PNP/NPN L/C/R” in my hands. 0 volts. Jun 19, 2019 · Using a digital multimeter in diode test mode, we can check NPN and PNP transistors to see if they have semiconductor junctions in tact, and we can also iden Nov 16, 2007 · METER TESTER: A portable, general purpose digital multimeter tester for batteries, cells, fuses, and other electrical components. Multimeter Transistor Tester Lcr-t4 Mega328 M328 Meter Backlight Diode Triode Capacitance Esr Meter Mos/pnp/npn L/c/r , Find Complete Details about Multimeter Transistor Tester Lcr-t4 Mega328 M328 Meter Backlight Diode Triode Capacitance Esr Meter Mos/pnp/npn L/c/r,Capacitance Meter resistance Tester capacitance Tester from Other Electronic Measuring Instruments Supplier or Manufacturer-Yiwu The transistor tester which we will use is the M328 transistor tester (Amazon link). These types of transistor testers can test all types of SMD components. Dec 23, 2022 · HILTEX 40508 Digital Multimeter Diode & Transistor Tester AC DC Volt Test Voltmeter, Automotive Multimeter Meter Tester, Measure Voltage Test, Car Battery Tester, Analog Multimeter Kit, Volt Meter 4. 3 out of 5 stars a) Testing an NPN Transistor. Dec 11, 2020 · Aitrip LCR-T4 Mega328 Digital Transistor Tester– the best for quick performance! The Aitrip LCR-T4 Mega328 tester comes with a sturdy case to store all the components that are supplied unassembled. These devices will repeat that same test for every transistor you subsequently test, so the displayed gain value is useful when Apr 27, 2021 · The PNP circuit is the same as the NPN transistor test circuit. Using the DMM, we explore the function of the transistor at it's most basic level to show if the t Jul 10, 2023 · 1. May 4, 2017 · For an good NPN transistor, you should see “OL” (Over Limit). Moving to our next best transistor tester, the M328 transistor meter. LCR Meter Transistor Tester are those transistor testers that look exactly like a multimeter and have two probes coming out just like a multimeter. 4 out of 5 stars 998 1 offer from $39. $3399. This transistor came out of a Dec 26, 2023 · Step 3: Measure the forward voltage drop. Thus, the transistor is a PNP with a base on wire 3, emitter on wire 1 and collector on wire 2 as described in Figure below. The usual test voltage is Apr 6, 2022 · A. The base-collector junction is one diode and the base-emitter junction is the other. Fig shows the process of testing an npn transistor with an ohmmeter. 4. 8-inch display to easily read the final display. This products can be used to measure the gate threshold voltage and gate capacitance of the MOSFET, bipolar transistor current amplification Apr 28, 2016 · Proster Multimeter 2000Counts LCD Multimeter Tester with Test Leads Alligator Clip Multi Meter for AC DC Voltage DC Current Resistance Diodes Transistor Audible Continuity Visit the Proster Store 4. Only the polarity of the staircase and triangle wave functions have been reversed. FETs are widely used for switching and amplifying electronic signals in the electronic devices. 45V and 0. [Robson]’s old meter didn’t even test for capacitance but he was able to get many Dec 15, 2021 · How to test a transistor with a multimeter from TME offer. Now invert the probe connections to the Emitter for the Red Probe and to the Base for Black. here I'm going through a little info about the pin identification and perform a diode test. 01mh-20H Display Type: Digital Display DC Current: pls check descripition DC Voltage: pls check May 3, 2020 · This page shows how to use a multimeter to test the most common semiconductors (diodes, transistors, etc), along with their associated readings and values. 00: Buy. Min. 45V to 0. Dec 31, 2023 · LCR-T10H Multi-function Transistor Tester Large Screen Display Transistor Meter. Compare this product. It compares the Bside ESR02 to the DROK and Kuman LCR and transistor testers. Diagnosing and repairing MOSFET circuits can be an intimidating prospect, but with the right approach, it's possible. 4 out of 5 stars 1,708 ratings Oct 1, 2019 · The transistor tester is a GM328A made for various transistor testing applications, but is also an LCR meter. If you are testing PNP transistor, the meter should show a voltage drop between 0. 2000 counts auto-ranging multimeter for precise measurement. 3 out of 5 stars 169 Klein Tools MM325 Multimeter, Digital Manual-Ranging 600V AC/DC Voltage Tester, Tests Batteries, Current, Resistance, Diodes, and Continuity. Jul 6, 2015 · In this video I demonstrate how to test a MOSFET transistor with a digital fluke multimeter in the off state and the on state. Please help support furt The conductivity of the foam will make a resistive connection between all terminals of the transistor when it is inserted. worldchips. $1749. ·Place the three legs of the Transistor first in the E-B-C formation. It is awesome and has a nice color display. 4 4. Check Price. com/groups/723491633169505/My website:https://www. Place the three legs of the Transistor first in the E-B-C formation. You will find them in power supplies and many electronic Feb 14, 2020 · To test a transistor using a multimeter in the diode-test mode, insert the black probe into Common and the red probe into Diode Test or Ohms. We can test various electronic components from this tester. Set the multimeter to the lowest resistance setting (usually 200 ohms or less). Fig. Switching time will be reviewed at a later time. Since the We’re starting this list with one of the best transistor testers, the Longruner transistor tester multimeter. Aug 8, 2014 · The transistor test feature seems a bit quirky, and I doubt I would even bother with it. Condition: New. 8" Full Color Display Transistor Meter for Diode Triode Capacitor Resistor Transistor LCR ESR NPN PNP MOSFET 4. To test a transistor, we measure one diode junction with the multimeter leads situated one way and then we flip the leads of the multimeter to the reverse position, to switch polarity. If that is so, the transistor is good. The multimeter will show the reading if this formation is correct, else it will show over range. 3% positive. It works quickly – the high-test speed is about 2 seconds. Mengukur Transistor dengan Multimeter Analog. We then obtain a list of those models that allow you to perform a transistor test, both using classical probes and using special pin sockets that work with pnp and npn transistors. There are also testers for checking high transistor and rectifiers . Brand Name: Aideepen DIY Supplies: ELECTRICAL Certification: CE Origin: CN(Origin) Model Number: Mega328 Transistor Tester AC Current: pls check descripition AC Voltage: pls check descripition Measuring Resistance Range: 0. 2V. Jul 6, 2020 · DROK Transistor Tester, Mosfet Transistor Capacitor Tester, Mega328 NPN PNP Transistor Diode Resistor Inductor Capacitance MOS SCR ESR Meter Automatic Checker Detector 4. Hubungkan Probe Merah pada Terminal Basis (B) dan Probe Hitam pada Terminal Emitor (E), Jika jarum bergerak ke kanan menunjukan nilai tertentu, berarti Transistor tersebut dalam kondisi baik. Cara Mengukur Transistor PNP dengan Multimeter Analog. I like this fantastic 1. 4 stars out of 17 reviews 17 reviews Learn More about Digilent transistor tester adapter . Put the component socket in the proper place in the transistor tester; Now take you transistor you want to test; Place it in the component socket in any To test the diode, check with your multimeter (preferably in diode range, otherwise ohms) if the diode's measures is around 600mV in one direction and HIGH (O. 7 out of 5 stars 5,193 Oct 10, 2023 · 3. With the test leads connected to the IGBT, turn on the multimeter. 99 Fluke 87V MAX True-rms Digital Multimeter. The staircase wave now goes from -700 mV to -5 V. Step 2: Join the base terminal of the transistor to the terminal marked positive on the multimeter. Hook the negative meter lead to the BASE (B) of the transistor. Jun 14, 2021 · Step 1: Start by setting the meter to its ohms range. 3. A PNP transistor can be tested by connecting the red probe of the multimeter to the Transistor Meter, Aideepen LCR-TC1 Multi-Function Capacitance Resistance ESR Tester 1. The forward voltage drop of an IGBT should be between 0. It is used to detect many electronic components, including transistors, diodes, thyristors, P-Channel & N-Channel MOSFET, capacitors, etc. Turn the dial on the multimeter to read a DC voltage. This wisTek pocketable multi-functional transistor tester is a great pick that is designed with a colored LCD 1. 4 days ago · 4. 9V. I also like the Longruner transistor tester because it is a Multifunctional tester. A meter with a calibrated "good" and "bad" scale is on the front. Contact seller. Not a Fluke or Simpson, but not $250 either. Atur Posisi Saklar pada Posisi OHM (Ω) x1k atau x10k. In this step, you will need to keep your digital multimeter positive, lead to the BASE (B), and then place your digital multimeter negative lead to the COLLECTOR (C). 99 Transistor Meter, Aideepen LCR-TC1 Multi-Function Capacitance Resistance ESR Tester 1. I’m going to get the obvious out of the way. 40508 Digital Multimeter Diode & Transistor Tester AC DC Volt Test Voltmeter, Automotive Multimeter Meter Tester, Measure Voltage Test, Car Battery Tester, Analog Multimeter Kit, Volt Meter 4. To test the mosfet for a short circuit, you will need to use the resistance setting on your multimeter. Touch the negative probe to the center pin (Base) concerning the pin-3 (Collector). Step 3: Join the terminal marked negative or common to the collector and measure the resistance. WISTEK Transistor Tester. In addition, these transistor testers are designed to check the solid-state diodes. If the reading is a flat 0, that’s fine too. 3 out of 5 stars Nov 5, 2018 · WIDE APPLICATION: This multifunctional capacitance meter can be used to test triode, field-effect tube(FET), diode, resistor, capacitor, inductor, MOS, SCR, which is available for various electric transistor testing. The multimeter should display a reading of the forward voltage drop across the IGBT. • Easy to read 3 1/2 digit LCD readout, positive set selector switch and 32" test leads. com/To s Step 2: For PNP Transistors. Figure 13: LTSpice simulation of oscilloscope / arbitrary waveform generator PNP transistor hFE test Nov 28, 2023 · Multi-Purpose Transistor Tester, Components Tester Diode Triode Capacitance Inductance Multimeter M328. Connect the multimeter's negative lead (black probe) to the emitter pin (E) of the IGBT. FREE delivery Fri, Jun 14 on $35 of items shipped by Amazon. 5. Aug 14, 2016 · A digital multimeter can be used as a fast and simple way to check a transistor for open or shorted junctions. Jan 4, 2016 · how to test a silicon transistor with a multimeter using the diode function. FREE delivery Fri, May 10 on $35 of items shipped by Amazon. FREE delivery Tue, Jun 4 on $35 of items shipped by Amazon. I used another same transistor that I am sure that it works on the circuit and I still get the same reading. Or fastest delivery Thu, May 9. 3K+ bought in past month. However, if it fails this check, the transistor is faulty and it must be replaced. ’. Measurement of hFE and base-emitter-voltage for bipolar junction transistors, also for Jul 5, 2017 · AstroAI Multimeter Tester, TRMS 4000 Counts Volt Meter Auto-Ranging Ohmmeter Digital 1. 5 out of 5 stars 99 Jan 23, 2015 · Step 2:Checking Transistor. Most manufacturers connect red to the positive terminal of the internal battery but this can vary, so it is best to check the polarity using a second multimeter in dc Volts mode. Now that’s all well and satisfying. The triangle wave now goes from 0 V to -5 V. 12. : 1 Component Testers LCR Meter 10Hz - 100 KHz High Precision T3LCR1100; Dec 28, 2018 · Transistor Meter, Aideepen LCR-TC1 Multi-Function Capacitance Resistance ESR Tester 1. (a) Put one probe on base, the other probe on emitter, (b) then reverse. Procedure of a Transistor Tester Using a Digital Multimeter Transistor Tester Using a Digital Multimeter. L. Aug 14, 2016 · A digital multimeter can be used as a fast and simple way to check a transistor for open or shorted junctions. In our lineup, those are: the AstroAI 6000, Crenova MS8233D, Fluke 117, Neoteck NT8233D Pro, Etekcity MSR-C600, Greenlee DM-45 600 Volt, and Klein Tools MM400. This will confirm whether the device is NPN or PNP. Read honest and unbiased product reviews from our users. Connect the Black (common or -Ve) test lead of the multimeter to the 1st terminal of the transistor and Red (+Ve) test lead to the 2nd terminal (Fig below). ( i ). Feb 2, 2024 · Connect the red probe of the multimeter to the transistor’s base and the black probe to the transistor’s emitter to test an NPN transistor. For instance: when there is one volt of input current at point A and one amp of input current at Jan 30, 2015 · HILTEX 40508 Digital Multimeter Diode & Transistor Tester AC DC Volt Test Voltmeter, Automotive Multimeter Meter Tester, Measure Voltage Test, Car Battery Tester, Analog Multimeter Kit, Volt Meter 4. It also analyzes transistor's characteristics such as voltage and gain. Transistor Tester Kit, LCR-T4 ESR Meter Transistor Tester, Mega328 NPN PNP Transistor Resistor Inductor Capacitance MOS SCR ESR Meter, Green. · If the previous method doesn’t work, place the three legs of the May 29, 2024 · Three very different sizes of multimeters. 3 out of 5 stars 598 Transistor Tester, Me-ga328 Mosfet Transistor Capacitor Tester, LC-R-T4 Transistor Tester for NPN PNP Transistor Triode Diode Resistor Inductor Capacitance MOS SCR LCR ESR Meter 4. Connect the red lead of the multimeter to the drain (D) terminal of the mosfet. PNP and NPN transistor can be checked using the digital Best LCR Meter Transistor Tester. Follow the following steps: Turn on the transistor tester first, you should see the screen light up. Touch the metal parts of your terminals together to make sure it works. 98 Feb 17, 2022 · ★ Versatile Multimeter with Wide Applications ★ The Sworely Multimeter accurately measures AC/DC voltage up to 600V, AC/DC current up to 10A, resistance up to 20MΩ. com/To s Here’s how you can do that: Keep your meter on the Diode setting and keep the positive lead to the Pin-1 (Emitter). 3: Image showing transistor placed in transistor region of multimeter. Even though any range can do, the best range is the middle ohms. Rugged, dustproof IP67 outer shell for the most extreme work sites. Measure up to 1000 V ac and dc. 5 and 1. To test the continuity setting’s calibration, touch the 2 terminals together and hold them in place. LARGE & CLEAR LCD DIGITAL DISPLAY: This amazing detector adopts 1. Set the meter on “Diode Test” Mode by turning the rotary switch of the multimeter. May 4, 2012 · The NPN transistor I used to test is the " mospec tip130 No11D " and it was off from the circuit. ”. Checking a transistor is easy with the most time of tools. Credit: Ben Hickok. Connect the Negative Probe (Black) to Emitter and the Positive Probe (Red) to the Base. This connection will ensure that all residual voltage built up across the gate-channel PN junction will be neutralized, thus “opening up” the channel for an accurate meter test of source-to-drain continuity. 99 Mar 23, 2011 · Here is a very simple circuit that can be used to check the hfe of transistors. 99/ea. Check for battery quality, automotive circuits, and charging systems. 8-inch Colorful Display. In terms of setting the range, you can't beat any of the auto-ranging meters. I'm learning about the 2N2222 bipolar junction transistor. So on a multimeter, it indicates a mode where the meter can measure (probably crudely), the HFE of a transistor. Discharge all the capacitors (by shorting the capacitor leads) in the circuit (If any). The needle should deflect to the right side,reading less than 100 ohms. Both PNP and NPN transistors can be checked using this circuit. If you used this setting to try and measure a 40V project the multimeter would run out of range Oct 16, 2018 · This post will cover how to test a MOSFET transistor using an analog multimeter. You can use it for continuity, diode, battery, frequency, capacitance test. US $17. Hfe as high as 1000 can be measured by using this circuit. Dec 17, 2017 · DROK Transistor Tester, Mosfet Transistor Capacitor Tester, Mega328 NPN PNP Transistor Diode Resistor Inductor Capacitance MOS SCR ESR Meter Automatic Checker Detector 4. 8" TFT color LCD screen with high-resolution. Automated detection of NPN, PNP, N- and P-channel MOSFET, JFET, diodes und small thyristors, TRIAC. Step 4: Measure the collector-emitter resistance. . Jan 30, 2015 · This item Neiko HILTEX 40508 Digital Multimeter | Diode and Transistor Tester | AC/DC Volt Test | Test Probes | Voltmeter | Multitester Meter |Volt/OHM Meter (VOM) | Measure Voltage Test(Pack of 25) AstroAI Multimeter Tester 2000 Counts Digital Multimeter with DC AC Voltmeter and Ohm Volt Amp Meter ; Measures Voltage, Current, Resistance; Tests Apr 1, 2020 · This video reviews 3 LCR and Transistor Testers. 2. Transistor testers have the necessary controls and switches for making the proper voltage, current and signal settings. Instead I read about ~1. 1 /5 (1) Free Delivery. g. If the number on the multimeter is less than 1, then your multimeter is functioning correctly. 3 out of 5 stars 1,619 Three test pins for universal use. By putting its probes on SMD components, you may test it or verify its value. By using this test, you can also identify the polarity of an unknown device. 6 out of 5 stars 14 $49. The KOOKYE Mega328 is an impressive in-circuit Transistor Tester that provides a wide range of useability. If multimeter shows reading then it’s correct. Feb 23, 2022 · Breakdown, or knee in curve traces are tested with a semiconductor analyzer. 574. In both those sets of meter readings, the black (-) meter test lead was touching wire 3, which tells us that the base of this transistor is made of N-type semiconductor material (black = negative). Touch the negative probe to the center pin (Base), and you’ll notice a voltage on the meter. (188296) 99. gb ir tp rz cq qf wr hm gd br