| Products > Test Equipment |
| 121GW Voltage Readings WAY WAY Off. Not a 121GW general issue |
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| daveyk:
It's working "Okay" again. I guess that's close enough for trouble-shooting purposed. It's how it always has compared to two certified 34401A metes. I assume .003v low is good enough. Now it the Auto-Ohm was just faster. v2.02 firmware. It's acceptable now. This thing just threw me for a loop yesterday and cost me about an hour and confused the heck out me. You have to rely on your test equipment. As cool as this meter is, I most often grab very, very old Fluke 75 or very, very old Fluke 83 (just recently fixed the display). I trust those meters more than the 121GW. I still waiting for when I need that 15v diode check, which would set this meter apart. Dave |
| NoisyBoy:
Good to hear it is back to normal. I don't trust the low battery symbol on DMMs, and changing battery is an easy test, that's why I always suggest people to try that first before opening up the meter. No matter how good a DMM is, I prefer to have more than one, ideally 3+. That way, when one reading is off, I can tell which one is truly off. |
| daveyk:
"Good to hear it is back to normal. I don't trust the low battery symbol on DMMs" There can be a science to battery level detection and it is not always the voltage (99% of the time it can be - lol), sometime rare times it can be a current delivery issue. The 121GW us smaller and prettier than either of my mid-1980's Fluke 75 or Fluke 87. Resistance AUTO mode still tests me at times. It works well in manual range mode, but rolling through the manual mode selections still confuses me. I don't feel what mode/range you are in is well enumerated on the LCD. I do not think it's a dot matrix LCD display, so we have what we have and enumeration can not be fixed in firmware. Dave could have made better choices in the LCD display mode indicators during the design process. It is what it is, I need to learn it better (although I shouldn't have to learn a DVM). When you trying to repair an instrument, it is okay that the broken instrument confuses you, it's not okay for your test instrument to confuse you. Again; thank you an take care. |
| rsjsouza:
@daveyk, thanks for reporting back the outcome of your predicament. I haven't had issues with battery indicators yet, but recently I suspect that several of my banana probes are starting to bite the dust - that or the meters' jacks. When making a measurement, I have to frequently rotate the plugs or wiggle the cables to get a solid "near 0Ω" reading. That drives me nuts when I make a reading and the measurement fluctuates... |
| joeqsmith:
--- Quote from: daveyk on April 29, 2020, 04:06:57 pm ---Thanks Joe. It was bad batteries, although no low batt indicator for some reason. I've seen portable instruments were the battery voltage was high enough to keep battery indicators from working, but could not supply current to properly operate the device. That may have been the case here. --- End quote --- Odd. I tried the production unit that was not stressed using a 10V reference. Vbattery, 121GW Readout, Low Battery Indicator 4.895, 9.999, Off 4.557, 9.999, Off 4.218, 9.999, On (this is close to the threshold) 3.978, 9.999, On 3.768, 10.000, On (this is where the meter will start to go inaccurate) 3.301, 11.062, On 2.596, 15.723, On 1.963, 30.24, On (this is pretty much where the meter will cut out) |
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