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November 24, 2013
News - Fluke, we love you but yo…
about 3 years ago
The average Joe on the street had no idea what a multimeter is, who Fluke is, what the difference is, and why they should care.
Those who buy multi meters know pretty well what they are buyin and why. Even the innocent newb will learn soon enough and choose either to spend extra on a second meter or not.
So. No. Its very unlikely we will see a melted yellow nlob on the news and collectively, as a global society, all exclaim “Gasp! Fluke meters KILL people!”
Spark fun, trademark red retail packaging and circuit boards.
Google image search for mining dump trucks. Several companies paint them yellow. Its a safe visibility issue. Caterpillar has a trademark yellow. I think at one point there was a color case in the industry, but it resulted in the original filer being told to patent the specific color and then prove the defendant used that very color, resulting in dismissal.
Owning a non specific shade or sharp is the definition of insanity.
Its like owning a patent on rectangular objects of non specific dimensions, which are to be connected to TV sets for entertainment purposes.
Yellow is a visibility and safety color. No matter how good they are, red and green meeters just look weird to me, andmany others.
Next thing you know, the hourglass hand shape will be patented by fluke too.
And to those saying its not flukes fault.. bs. They filed the patent in the first place. Then the p.o. let it pass (due to incompetency or bribery).then fluke had to demand the dept of homeland oppression to enforce it.
about 3 years ago
Here is a calibration gas source:
There are many others.
These sensors work in ‘open air’ environments only. So called “PURE” gas environments are not possible. Typical Oxygen mix PLUS the contaminant to check for.
Calibration is done in a sealed container, with a stirring fan. Find a large square tupperware bowl or small fish tank. Fit a tight lid to the tank. Fit a hose fitting to the lid, such that the sensor can be coupled to the tank. Fit a second hose fitting connected to a syrenge or small gas cylender. Apply a given gas and evaluate readings according to the data sheet. Before testing, be sure to run the fan with the lid OFF in order to mix the environment.
For example, 1CC of rubbing alcohol in a syrenge pumped into a tank of 1000CC volume, dropping in front of the fan, should quickly mix. Or use a bicycle/paintball gun CO tank.
In this case, calibrations are in reference to the typical atmosphere of the calibration location.
The purpose of the one time bake 12/24 hours) is to eliminate any remaining moisture or contamination from the manufacturing process. Remember that this sensor operates by the gas coming in contact with a doped ceramic coating (which the heater is embedded in). As for the voltage cycle/level.. I don’t know. I am making contact with Henwai. time is in the data sheet.
For readings, you need only bring the sensor up to temp and ‘burn off’ any new contaminants. Data sheet suggests a 3 minute heat time before taking a reading, followed by a cool down before taking another reading.
When operating outdoors, it is suggested that you run the heater all the time at a LOW power to keep it warm (above outdoors ambient/above freezing). This will keep it dry and prevent it from freezing. Moisture will affect readings. Fully wet or frozen will destroy the ceramic.
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