|Item Weight||2.08 ounces|
|Product Dimensions||3.1 x 3.1 x 1.2 inches|
|Item model number||MRH1631426738275XW|
|Item Package Quantity||1|
|Included Components||1 * Transistor Tester DIY kit|
KKmoon MRH1631426738275XW Multifunctional LCD GM328 Transistor Tester Diode Capacitance ESR Voltage Frequency Meter PWM Square Wave Signal Generator
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- Digital LCD display for easy readings, can display measured data and graphics. Rotary switch control, a key measurement for convenient use
- Main chip is the dip, easy for electronic Enthusiasts to DIY or update the main chip. Use 9V battery included), can also use DC powerful 6.8-12V)
- Test npn and pnp transistor common-emitter current amplification factor, the base-emitter threshold voltage, off the collector - Emitter leakage current
- Automatically detects npn and pnp transistors, FET, diodes, dual diode, thyristor, automatic identification of the transistor pin out
- Support 2 resistors measurement, show its positive and negative, on-state voltage. Resistance measurement maximum resolution 0.01Ω, can be measured up to 50mω
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Multi-functional transistor tester for automatic detection of npn and pnp transistors, fet, diodes, dual diode, thyristor, scr, automatic identification of the transistor pin out. Also can be used as square signal and pwm signal generator. Automatically test the pins of a component and show on the display. Measure fet Gate threshold voltage and Gate capacitance. For the following 2100ω resistor while measuring its Inductance measuring range from 0.01mH - 20H. Can be used as signal generator and frequency meter: frequency range from 1hz-2mhz and can generate 1%-99% pwm(pulse width modulation) signals. Notice before measuring capacitance, the Capacitor must be discharged, otherwise very likely damage the meter. Specifications type: assembled tester / DIY kit(optional) display: 160*128 LCD power supply: 1 * 9V battery included); DC 6.8-12V current: Approx. 30mA power supply: 1 * 9V battery included) resistance measurement: max. 50Mω resistance resolution: 0.01Ω capacitance measurement: 25pf~100mf capacitance resolution: 1pF DC voltage measurement: up to 50V screen size: 3.7 * 3cm / 1.45 * 1.18in PCB size: 7.8 * 6.2cm / 3.1 * 2.44in product weight: 66G / 2.3Oz package weight: 69-73g / 2.45-2.57Oz what is in the box 1 * transistor tester DIY kit.
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I was a bit concerned by some of the earlier reviews and the power transistor. Looking up spec's I can easily see why at times others have had issues and once assembled I was shocked. It didn't turn ON! :(
I metered out things on the circuit to ensure I was accurate and not being a total newbie to the game; all my assembly and soldering were spot on. I was loading up the RETURN page for this item when I leaned forward and happened to plunge the potentiometer down. It came to LIFE!
Nowhere in the reviews here nor online related to this 'type' indicate the power is on the pot and I feel a bit stupid now not even thinking about it prior to my happy accident but those who might feel they have a 'dud' just make sure you're powering it on! Depress the pot for power on.
(there were no instructions, so this is not a 100% newb friendly kit. If you have a DMM that can test resistance, you can easily pick through the unlabeled resistors without resorting to deciphering color codes... that used to be a valuable skill, but SMT is quickly making TH technology obsolete... everything else has markings and its as simple as plugging it into the board where the silkscreen shows you.)
-1 star for not including a parts list to confirm I had everything (I did) & not labeling any of the resistors. Decoding the new 5 color band system is a PITA & not always accurate because you can read them backwards, so using a multimeter like I did to measure each resistor is strongly recommended. Which is ironic because measuring resistors is one of the functions of this kit.
Amazing that it can discriminate what components are in the slot so well.
The documentation on line is vital to understanding the calibration/self test procedure.
One little problem with how it operates, and it's baffling why after seeing how capable it is reading transistors. The bleeding voltage tester reads zero v if the polarity of the test leads is wrong. It actually doesn't have the capability to show -vdc, and that can fool you.
Just make sure when testing voltage that you try both ways before deciding there's no voltage present.
The other weirdness is that the freq input is at the top instead of beside the voltage input.
All in all not too shabby.
2. An Optivisor at 2.5x magnification or similar unless you have amazing eyes and are not prone to strain
3. A multimeter to verify component tolerances is recommended (one resistor was too off for my liking, easily replaced w/ spares lying around)
4. A good soldering iron with a clean tip
5. Rosin/flux to help flow clean joins...and 91% alcohol to clean the board as you go.
Put this together over a couple of days and it was quite easy. Probably the hardest part was getting the pot to line up. Really recommend not relying on solder with integrated flux..Got some good Kester and it just does not flow as nice with out additional rosin/flux. Not only do things flow nicely, it flows quickly. For those that are not able to get the unit to work, its one of the following...Bad component out of the bag (test what you can with a multimeter before joining), misplaced component (check and re-check before joining), bridged joint or staying too long on a component with the iron and burning it out (which is why I recommend rosin/flux). This is a 2 layer board and although the inserts most likely bridge the two layers, flow the solder enough to be seen level with the top side (just don't over do it). Now I have an ESR meter that cost ~$15 versus $127, worth it for that alone.
- multi meter that shows ohms
- good solder iron
- good magnifying glass to read capacitor/transistor print and inspecting your solder joints
- solder wick to fix bridging of the solder on the transistor solder points
- know the diode symbol and +/- orientation