4 votes

Calibrate a sensor using another, already calibrated sensor

The starting point is to recognize that your calibrated sensor is first used to calibrate your light source, and then your calibrated light source is used to measure the response of your second ...
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3 votes

Calibrate a sensor using another, already calibrated sensor

Apart from Jeffrey's excellent analysis I'd like to point out that, assuming that sensor A is calibrated and has a linear response, it seems like sensor has a non linear response. Figure 1: Excel ...
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3 votes

Calibrate a sensor using another, already calibrated sensor

Plot dat_A against dat_B. Fit a curve to it (linear would be the simplest). Use the curve as a lookup table to lookup sensor A ...
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  • 591
2 votes
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Thermistor - Steinhart-Hart Coefficients

It depends to some extent. Normally you'd assume you should look at the datasheet, see what it's operating limits are and then use the centre point for your 3 points. If the thermistor is not entirely ...
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  • 125
2 votes

Rule of Tens/Ten to 1 Rule in Measurement and Inspection

Remember that a rule of thumb is just that, a rule of thumb. It is not a hard specification, so in some sense there really is no right answer here. It is a good starting point, but to determine what ...
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  • 2,511
2 votes

Calibrate a sensor using another, already calibrated sensor

Figure 1. Making a scatter-plot on Google Sheets and adding in a trend line suggests that you've got a good chance. A quick search shows many articles on find the equation but it would be simple ...
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  • 8,229
2 votes

Calibrating a system with matrices

It seems that you have two independent control parameters, the input and the temperature. You have a choice on where you decide to set the dependencies. Suppose we define $I$ for input, $T$ for ...
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1 vote

Figuring out Geometry for Kreg 720

This is what your measurements tell me: This is the suggested measurement you shall take if you are interested in the incline of the cutting plane. (Note, "a" is a fixed point on the moving ...
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  • 7,491
1 vote
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Figuring out Geometry for Kreg 720

I think you're over-complicating this. The angle of the jig and wedge is twice the angle of the screw. It's designed to bring the tip of the bit out in the centre of the edge of the piece being ...
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  • 8,229
1 vote

Why are FBG sensors recalibrated every 10 years?

Theory of Fiber Bragg Gratings FBG technology is one of the most admired choices of optical fiber sensors due to their simple manufacturing and relatively strong reflected signal. FBGs are formed by a ...
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  • 7,491
1 vote
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Method for permanent adjustment of pitch and roll of a mounting plate

A simple solution would be : Two matching square plates with an M8 hole in each corner. Sandwich a bit of moderately thick rubber, 10mm thick maybe, with matching holes between the two plates ...
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1 vote

Method for permanent adjustment of pitch and roll of a mounting plate

You could order two large washers that are cut off a tapered plane, called beveled Washers. by rotating them over each other you get a level platform with ease. link
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1 vote

Rule of Tens/Ten to 1 Rule in Measurement and Inspection

The best metric of confidence in making measurements is the overall relative uncertainty of the measurement. Two factors contribute to uncertainty for a measuring device. One is the calibration ...
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1 vote

Rule of Tens/Ten to 1 Rule in Measurement and Inspection

Correct. The rule of thumb is multiply your tolerance range by 10% (or divide by 10) to get the minumum resolution of your measuring device. Regarding the 12.96 tolerance range because more ...
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  • 1,578
1 vote

Quantifying Instrument Precision Using Multiple Measurements: Rounding

It's more than merely a question of absolute max and min. I recommend you read Bevington's "Data Reduction and Error Analysis" as a good, simple start. Precision can only be estimated based on ...
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