Had to look it up but that is a traditional generator.. Now volt meters come in two flavors (AC volt meters that is) Peak reading and RMS.. So what is the difference? On a pure sine wave a peak reading meter reads 1.414 times the RMS voltage and generally then multiplies by .707 so as to display the RMS voltage. where as the RMS meter uses an intergreator to directly determine the RMS voltage.
What does that have to do with your readings?
Well. Generators fall into 3 categories
1: Traditional "Contractor" type generally "open frame" in these generators the motor generally runs at 3600 RPM so as to show 60 HZ on that frequency meter they put on your EX-1000
2: Larger generators like my ONAN where the motor runs at a fraction of 3600, 1800 in my case, I've seen some 1200 rpm models as well.
3: Inverter generators like the Honda EU 1000i where the motor speed has NOTHING to do with the output frequency, that is set by a rock (Piece of quartz) inside the inverter module.
IN reverse order:
The inverter generators produce power that is as clean as it gets.> Think a very good FLUTE type note (A flute is a sine wave, pure sine wave)
Low speed motor generators (LIke my Onan 5500 watt) also tend to produce fairly clean power (I once scoped mine to see how clean) Though not as good as the Pure Sine Wave Inverter, still very sweet.
3600 RPM direct drive generators (Generally smaller portables) can be downright nasty producing some serious voltage spikes... A PEAK READING meter can be fooled by those spikes.. Note that peak reading meters are less expensive than True RMS (I have both types on hand in the RV. some of the True RMS types carry price tags of 200 or more,,, not that I paid that much (Fire sale) but that's the sticker,, Peak reading.. Free at Harbor Freight from time to time) kind of "Cheaper".
A good test is a 60 watt or 100 watt now days incascedent light..
at 180 volts it will have a tendency to act like a flash builb.
But compare the light to what you see when you plug in to the hole in the wall at home.. Same light = same RMS voltage it is an RMS indicator
Lots brighter the voltmeter is telling the truth.
IN ANY CASE. Using that portable to run electronics.. Bad idea.