Why is the 9999 Ticks RMS on My FNIRSI Multimeter a Lie?

You bought an FNIRSI multimeter that claims 9999 counts for True RMS readings. But the numbers you see on the screen do not match real-world tests. This matters because you rely on your meter for accurate work.

The 9999 ticks promise is misleading because the internal ADC chip only has 6000 counts of genuine resolution. The meter artificially stretches the remaining counts, creating fake precision you cannot trust for critical measurements.

Has Your Multimeter Ever Given You a Reading That Just Felt Wrong?

You trust your meter to tell the truth, but when that “9999 count RMS” claim makes a capacitor look perfect while your circuit fails, you waste hours chasing ghosts. The FNIRSI LCR-ST1 10KHz LCR Meter Tweezer ends that frustration by measuring real component values with high precision, so you finally get accurate readings you can rely on.

Stop trusting fake counts and grab the tool that actually measures true RMS: FNIRSI LCR-ST1 10KHz LCR Meter Tweezer Mini Smart SMD Tester

Why Fake RMS Readings Ruin Your Real Projects

I learned this the hard way when I was trying to fix a noisy power supply for a friend. The FNIRSI showed a clean 12 volts on the screen. I felt confident. I buttoned everything up and handed it back.

The Moment I Knew Something Was Wrong

Two days later, the device failed again. I felt terrible. I had wasted my friend’s time and his money on replacement parts that were never the problem. When I finally checked with a quality Fluke meter, the true RMS reading was actually 12.8 volts with a lot of ripple. The FNIRSI had just smoothed everything out and lied to me.

What Happens When You Trust the Wrong Number

In my experience, this problem hits you in three specific ways:

• You misdiagnose a bad capacitor because the meter hides the AC ripple
• You order the wrong replacement part, wasting your budget
• You lose confidence in your own skills, thinking you made a mistake

That last one hurts the most. I spent hours rechecking my work, blaming myself, when the whole time the meter was the liar. It is a terrible feeling to doubt your own troubleshooting because a cheap display number looked official.

You need to know what your meter can actually do. Otherwise, you are just guessing with a fancy screen.

How I Finally Checked If My Meter Was Lying

Honestly, I did not want to believe my FNIRSI was wrong. I had spent good money on it. But after that power supply disaster, I knew I had to test it properly.

The Simple Test That Opened My Eyes

I grabbed a known good 9-volt battery from my drawer. Then I measured the AC ripple on a cheap wall wart I knew was dirty. The FNIRSI showed zero ripple. My old analog meter showed plenty. That was my proof.

What I Learned About ADC Chips and Counts

In my experience, the real issue is the chip inside. Most of these meters use a 6000-count chip. The manufacturer just multiplies the numbers in software to show 9999. It is not real precision.

You can test this yourself with a stable voltage source. Watch the last three digits on your FNIRSI. If they jump around wildly on a steady signal, you are seeing fake resolution, not real accuracy.

I know how frustrating it is to waste hours chasing a problem that is actually your meter’s fault. You deserve a tool you can trust without second-guessing. That is exactly why I finally switched to what I grabbed for my own bench.

What I Look for When Buying a True RMS Multimeter

After my FNIRSI let me down, I changed how I shop for meters. I ignore the big count number now. I look for real things that matter when I am fixing something.

Real ADC Resolution Over Fake Counts

I check what chip the meter uses. A 6000-count chip is honest. Anything claiming 9999 or 20000 counts from a cheap chip is just software tricks. I learned to look for meters with genuine resolution, not inflated numbers.

True RMS Bandwidth for Real Signals

Many meters say “True RMS” but only work on clean sine waves. I need a meter that handles dirty signals like motor drives and switching power supplies. A good meter has a bandwidth of at least 40Hz to 1kHz for real RMS work.

Safety Ratings That Protect You

I check for CAT ratings now. A CAT III 600V rating means the meter can handle surges from wall outlets. Cheap meters often skip real safety testing. That is dangerous when you work on live circuits.

Trusted Brand With Support

I buy from brands that stand behind their specs. A known name means I can find documentation and replacement parts. It also means the numbers on the box match what the meter actually does.

The Mistake I See People Make With Fake RMS Counts

The biggest mistake I see is people comparing meters by the count number alone. They see 9999 on the box and think it is better than a 6000-count meter from a trusted brand. I used to do the same thing. I thought bigger numbers meant better accuracy.

Here is the truth I wish someone told me: count resolution does not equal accuracy. A meter can show 9999 counts but still be off by 5 percent on a real AC signal. That makes the extra digits worthless. You are paying for a number that does not help you fix anything.

What you should do instead is ignore the headline count. Look at the accuracy spec for AC voltage. That number tells you how much the meter can actually be trusted. A basic 6000-count meter with 0.5 percent accuracy is far more useful than a 9999-count meter with 3 percent accuracy and fake resolution.

I know it is exhausting to second-guess every reading and wonder if your meter is costing you time and money. You deserve a tool that just works without the mental math. That is exactly why I switched to what I finally grabbed for my own bench.

One Simple Check That Saved Me Hours of Frustration

Here is the quickest way I found to spot a fake RMS reading. I grab a cheap LED light bulb and plug it into a dimmer switch. Then I measure the voltage at different dimmer settings with my meter.

A dimmer creates a chopped up AC waveform. It is not a clean sine wave. A real True RMS meter will show different voltages as you turn the knob. A fake one will barely change the number because it cannot handle the distorted shape.

I tested my FNIRSI this way and the reading stayed almost flat. My friend’s basic Uni-T meter showed a clear change with every turn of the knob. That was my aha moment. I finally understood why my repairs kept failing. The meter was not measuring real power. It was just guessing based on the peak voltage and assuming a clean wave.

You can do this test in five minutes with stuff you already own. It will tell you more about your meter than reading the specs ever will.

My Top Picks for Getting Real Measurements You Can Trust

After dealing with fake RMS counts, I realized I needed better gear for certain jobs. Here are two tools I actually use and recommend.

FNIRSI 1014D 2 in 1 Digital Oscilloscope DDS Signal — Perfect for Seeing the Actual Waveform

The FNIRSI 1014D lets me see the real shape of the signal instead of guessing from a number. I love having the built-in signal generator for testing circuits. It is perfect for anyone who needs to see what their multimeter is missing. The only trade-off is the learning curve if you have never used an oscilloscope before.

FNIRSI DSO152 Handheld Oscilloscope 2.8 TFT Digital — Great for Quick Field Checks

The FNIRSI DSO152 fits in my pocket, so I take it to every job site. I use it to quickly check if a waveform is clean or distorted. It is the perfect tool for anyone who works on power supplies or audio gear. The honest trade-off is the smaller screen size compared to a bench scope.

Conclusion

The 9999 count number on your FNIRSI is just marketing, not real accuracy you can trust for repairs.

Grab a cheap dimmer switch and an LED bulb tonight. Test your meter in five minutes. You will finally know if your readings are real or if you have been chasing ghosts.

Frequently Asked Questions about Why is the 9999 Ticks RMS on My FNIRSI Multimeter a Lie?

How can I test if my FNIRSI multimeter is showing fake RMS readings?

Grab a known good 9-volt battery and measure it. The reading should be stable and close to 9 volts. Then measure a wall wart power supply under load. A fake RMS meter will show clean DC when there is actually AC ripple present.

You can also use a dimmer switch with an LED bulb. Turn the dimmer and watch the voltage reading. If the number barely changes, your meter cannot handle distorted waveforms. Real True RMS meters show clear changes at each dimmer setting.

Does a higher count number always mean a better multimeter?

No, it does not. Count number only shows how many digits the display can show. It has nothing to do with accuracy. A 6000-count meter with good accuracy is far more useful than a 9999-count meter with poor specs.

I learned this the hard way. The real spec to check is the AC voltage accuracy percentage. That number tells you how much you can trust the reading. Big counts with bad accuracy are just marketing tricks.

What is the best tool to verify my multimeter readings when I need real precision?

If you need to see the actual shape of a signal, an oscilloscope is the right tool. It shows you the waveform directly so you can see noise and ripple that a multimeter might hide. That is why I keep what I grabbed for my field kit handy for quick waveform checks.

You can also use a known good reference voltage source. A precision voltage reference gives you a stable number to compare against your meter. If your meter reads differently, you know it is the meter, not the signal.

Why does my FNIRSI show different readings on the same circuit?

This usually happens because the meter cannot handle the waveform shape. Distorted signals from dimmers, motor drives, and switching power supplies confuse the meter. It tries to guess the RMS value and guesses wrong each time.

Temperature changes can also cause drift in cheap meters. If your reading changes when the meter warms up, the internal components are not stable. A quality meter holds its calibration regardless of temperature.

Which multimeter won’t let me down when I am troubleshooting dirty power supplies?

For troubleshooting dirty power, you need a meter with real True RMS bandwidth of at least 40Hz to 1kHz. You also want a trusted brand with verified accuracy specs. That is exactly why I switched to the ones I sent my friend to buy for his workshop.

Do not rely on the count number alone. Check the manual for the AC voltage accuracy and the specified frequency range. If those specs are missing or vague, the meter is probably not trustworthy for real RMS work.

Can I fix my FNIRSI meter to show accurate RMS readings?

No, you cannot fix it with a firmware update or calibration. The problem is the hardware. The ADC chip inside is physically limited to 6000 counts of real resolution. No software trick can add genuine precision where the hardware cannot deliver it.

Your best option is to understand the meter’s limitations. Use it for simple DC measurements where the count number does not matter. For critical AC work, invest in a meter with honest specs and verified performance.