Question about GB Electrical GET-202A Low Voltage Tester

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Power Supplies Question

What kind of power supplies and voltage types can I test with my tester?

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Usually, It can measure AC and DC voltage, DC current, and resistance. It also checks diodes, verifies continuity, and tests 1.5 V and 9 V batteries

Posted on Aug 27, 2008


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How to use

Voltage testers and volt meters are two different things. A meter will provide a an indication of the exact voltage and type AC or DC. A tester on the other hand simply provides an indication of presence of power with little to no indication of how much or type.

AC power is what is provided by most power companies in the world. DC is a type of power provided by batteries and DC power supplies. If your tester or meter has provisions to check for AC and DC, you should check for BOTH. If AC power is present and you are have set your meter to test for DC power, your meter will indicate 0 volts. You can see this can be a dangerous condition. Most simple testers will not care if AC or DC power is being tested and the types that use neon lamps will usually glow differently for AC and DC power.

When setting up for testing voltage, you must test across the power source (or in "parallel") or load (such as a light bulb), as opposed to "in series" with the power source. Across would be from the + to - post of a battery, into the slots of an outlet, etc. "In series" is when the tester would be completing a circuit - such as testing across an open switch.

First, check the meter's operation by testing a known good power source by following the next steps. Set the meter for the type power to be tested. Choose AC if unsure. Next, set the meter for the highest voltage range supported. Make sure this range is higher than the expected voltage, otherwise damage to the meter may result. Connect the probes to the power source. Read the meter. If the meter moved only slightly, adjust the range of the meter to the next lower value. You can keep adjusting downward as needed to get the most precise reading possible - but do not set the range to a value less than the voltage present. A 0-300 volt scale is the lowest to measure a 240 volt outlet - switching to a 0 - 150 volt scale will damage the meter. The 0 - 150 volt scale would be fine for measuring 120 volt outlets.

If the meter did not move, change the type from AC to DC. and repeat. If it still does not work, the meter is not working correctly (if testing a know good source) or there is no power present (if the meter worked on a known good power source).

Good luck!

May 12, 2012 | Measuring Tools & Sensors

1 Answer

Lost 12 volts

If it is under warranty, it is coverd.

If you are wanting to try fix it, the 12 volt section is only marginally regulated but there is voltage reference IC, type 431 where you can start. If you are not seeing any voltage at any terminal it is probable a capacitor failed. Also check the other electrolytic capacitors. Use a tester as the failure may not show any stress visually, or just recap the entinre power supply, The single large capacitor with typically a 400 volt WVDC or higher is usually fine if just the 12 volt section lospower.. Use high ripple types or polymer types as there are differences internally..

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1 Answer

Virea tv has just stopped working. Whilst watching it has switched itself off and there is no standby light or anything. All power cords and supplies are fine but it won't switch back on.

Good day!Follow this D.I.Y procedures to find the exact problem of your TV.
  1. Remove the back cover of your TV.
  2. After that,find the power supply board.
  3. If you already found the power supply,plug-in your TV and power it ON.Check the input voltage of it,using multimeter (AC range).If the power supply have no input voltage the problem could be the power cord.Replace it.
  4. If the power supply have the input voltage,try to test the output voltage if have 5vdc for the system and logic supply,12vdc for the sounds and 24vdc for the back-light inverter.Use your multimeter tester (DC range) to test that.
  5. If the power supply have a voltage outputs such as 5vdc,12vdc and 24vdc and the problem is still there.The problem could be the main board.Replace it with the same type and model # because the main board is no very difficult to fix and its very sensitive.
  6. If the power supply have no output voltage or the voltage is too low,just ignore the step # 5 because the problem is not on the main board,its on the power supply board.
Check the following to fix the power supply board:
  • Fuse: Check the fuse if it is busted or blown.
  • Power transistor (regulator): Check the regulator if it is shorted or leak.
  • Resistor: Check the resistors specially the one that have a low resistance that near the power regulator.
  • Capacitor: Also check the capacitors if it is leak or bulging top.
NOTE: If you found any defective parts or components that mention above replace it with the same value,type and ratings.

I hope this solution will be helpful.Thank you and good luck.

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No Power, lights

Many of the new switching power supplies don't have fuses. These supplies porvide current based on load. That's why you can't unplug a supply and use a DVM to test for voltage. If you're sure that's the problem take it to a reputable repair person. He/she should have a load tester and be able to confirm if it's bad or not. If it's not we have alot of ground to cover from there.

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How can I test FSP250-60 ATV power supply to see if it works or not? Can I test it before I buy a replacement unit? Computer will not power up. Alredy switched power cords several times...and it still...

A great way to test a PSU is to use a PSU Tester. The device allows you to see if all the circuits are getting power and it only requires you to plug it in to power. This allows the ability to test it safe and reliably without accidentally damaging hardware. Below is a link to a tester.

PSU Tester

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