You bought a multimeter, held the probe, and saw a few volts. Then you touched your grounding sheet expecting the number to fall to almost nothing. Instead it went up.
That result is confusing, and it's one of the most common questions in grounding forums. The good news: it almost always has a simple, fixable cause. A rising reading is your meter telling you the sheet is not connected to ground. Below is why that happens and how to find the break in about ten minutes.
What your meter is actually measuring
The wiring in your walls, lamp cords, and power strips carries alternating current. That current creates an electric field, and your body, sitting in that field, picks up a small AC voltage through capacitive coupling. No wire has to touch you. Readings of 1–5 volts AC are typical in a bedroom, and they climb near outlets, lamps, and power strips. Upper floors of a building usually read higher too.
A body voltage test measures the difference between you and ground. One probe connects to ground, through the ground port of an outlet. You hold the other probe.
When you touch a properly grounded sheet, the induced voltage has a path to drain away. In a 2016 study of people near ordinary household appliances, grounding cut measured AC body voltage by an average of 58 times. In practice, a working setup takes you from a few volts down to the millivolt range.
Why the number goes up instead
A grounding sheet is a large sheet of silver-woven fabric. If its connection to ground is broken anywhere, the sheet doesn't drain anything. It just sits in the same electric field you do, and because it's big and conductive, it collects that field like an antenna.
When you touch it, you add the sheet's surface area to your own. Your combined "antenna" gets bigger, so the meter reads higher. A forum user who saw 5 volts on their own and 10 volts while touching the sheet was seeing exactly this.
So the rule is simple:
- Reading drops to near zero: the sheet is grounded and working.
- Reading stays the same: you probably aren't touching conductive fabric (a cover sheet, heavy lotion, or thick clothing is in the way).
- Reading goes up: the sheet is floating. Something between the fabric and the earth is disconnected.
The 10-minute test to find the break
Work from the wall toward the bed. Each step rules out one link in the chain.
- Check the outlet. Plug an outlet tester into the outlet you use. If it shows "open ground," the round hole isn't wired to anything. This is the most common cause, especially in homes built before the 1960s and in outlets that were swapped from two-prong to three-prong without a ground wire. Move to an outlet that tests correctly, or use a grounding rod.
- Check the cord. Set your multimeter to resistance (Ω). Touch one probe to the round ground prong on the cord's plug and the other to the cord's sheet-end connector. GroundLuxe cords include a 100,000-ohm safety resistor, so expect a reading near 100kΩ. "OL" or no reading means the cord is broken inside.
- Check the connection to the sheet. Snap or plug the cord into the sheet. Now touch one probe to the cord's ground prong and press the other flat against the sheet fabric at a few spots. You should again see roughly 100kΩ. If the cord tested fine alone but fails here, the snap isn't seated, or the connector is dirty.
- Check the fabric. If one area tests fine and another doesn't, the silver in that area may be worn or coated. Fabric softener and dryer sheets are the usual culprits because they leave an insulating film on the fibers. A wash in plain detergent often restores it. (See how to make grounding sheets last longer.)
- Retest your body voltage. Set the meter back to AC volts. Black probe to ground, red probe between your fingers. Note the number, then lay your other hand flat on the sheet. It should fall to a small fraction of a volt.
Common testing mistakes
A few setup errors produce confusing readings even when the sheet is fine:
- Meter on DC volts. Induced body voltage is AC. Use the V~ setting.
- Black probe on the sheet instead of ground. That measures you against the sheet, not against earth. The reference must be the outlet's ground port or a grounding rod.
- Testing through another layer. A regular sheet or mattress protector on top blocks skin contact. The grounding sheet should be the layer you touch.
- Very dry skin. It can slow the drop slightly. Touch with your full palm, not one fingertip.
When it still won't drop
If every outlet in your home tests as open ground, or you live in an older building, an outdoor grounding rod gives you a direct connection to the earth that skips household wiring entirely. Push the stake into moist soil, run the cord through a window, and connect it to your sheet. Then repeat step 5. Renters can find more options in our guide to using a grounding sheet in an apartment.
If your GroundLuxe sheet tests as broken and the cord and outlet check out, contact our U.S.-based support team. Every sheet is covered by our 2-year warranty and 60-day money-back guarantee.
Make testing easy: the GroundLuxe Multimeter Testing Kit comes with step-by-step grounding instructions, so you can run all five checks in one sitting.
