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Helpful Tips & Useful Information

We have collected some useful pointers over the years that will be beneficial to you as a Scopemeter owner. If you have a question or tip that is not listed here, please contact us and tell us about it.

If you are looking for answers to frequently asked questions (such as how to place an order), please see our FAQs & Contact page.

Maintenance & Care

How to clean a display window

The display window is the clear polycarbonate window on the front of the scope's case that protects the LCD. These windows are easily scratched and should only be cleaned by following these tips:

  • Use a microfiber cloth (such as for cleaning eyeglasses) and a good quality polycarbonate cleaner fluid.
  • NEVER use a solvent that will attack polycarbonate; if unsure, test fluid on a scrap piece first.
  • NEVER use a cotton material; cotton is slightly abrasive and will leave tiny but noticible scratches on the window.
  • Do not allow the fluid to contact the beveled edges of the window; it will lap behind the window due to capillary action and you will have to disassemble the scope to clean it out.

How to clean a Scopemeter case

There is a difference in material between the dary gray and yellow plastics used on a Scopemeter. Using a shop towel, clean these parts separately if possible; do not let the solvent for the yellow parts touch the gray parts and vice versa.

For the yellow rubber components, use Goof-Off. For gray parts, use GooGone. Both of these are available at most hardware or home improvement stores.

DO NOT allow the solvent to stay on the gray or yellow parts for any length of time. The solvents work well because they literally eat into the material. DO NOT TRY THIS IF YOU ARE NOT CONFIDENT YOU CAN DO IT.

Use a small amount and work quickly to remove stains, grease, and mild markings. When the resistance of your rubbing motion begins to increase, STOP. The material is beginning to melt due to the solvent and you will cause marring of the surface.

Disclaimer: this information is provided for informational purposes only; ScopemeterRepair.com LLC is not responsible if you damage your meter by using the solvents listed above.

Buying A Used Instrument

Thinking of purchasing a used Scopemeter but want to know what to check first? Here are a few pointers:

43/43B & 120 Series

The most common point of failure is in the trigger circuit. When this circuit is not functioning, you will see a waveform but the meter will not hold steady to a rising or falling edge; the waveform will flicker across the display making readings impossible to achieve.

If possible, check the battery charging circuit. With a charged battery installed, the voltage across the positive and negative terminals should be appriximately 5 volts. With no battery installed, the voltage should be about 8 volts.

In OHMS and CAP modes, the reading should always be OL (overload) with open inputs on all ranges.

190 Series

Test the movement and ranges of both channels and the meter channel:

  • Move each channel all the way up and down at all voltage ranges;
  • Check that a waveform is present when the timebase is below 5µs;/li>
  • Switch to METER mode and check that all voltage ranges show approximately 0 volts;
  • Change the meter to OHMS mode and verify that the reading is OL (overload), indicating that no resistance is detected.

With a charged battery installed, the voltage across the positive and negative terminals should read around 8 volts. When powered by the charger alone with no battery, the positive battery connector terminal should read approximately 11 volts.