Gauge class and calibration check

Part 1 shows what an accuracy class means on your press and die. Part 2 checks a calibration record against limits you set. The class is your assumption or comes from your gauge’s certificate: the PressPro™ specifications do not print one. The example numbers only show the format.

Part 1 · What a class means on your die

Gauge

%
mm
MPa
±%
class band, % of readingyour toleranceyour targetbelow 20 % of full scale

Part 2 · Check a calibration record

Unit of the record

Number of points

#Press indicatedPressReference, run 1Ref 1Reference, run 2Ref 2Reference, run 3Ref 3Reference, falling loadFalling

Press: the force the press showed. Ref 1 to 3: the reference load cell at that point in each rising series. Falling: the reference on falling load.

1
2
3
4
5
6
7
8
t
±%
%
±%
%

Part 1: force = pressure × die area ÷ 9800. For a PressPro™ frame the specification prints the gauge reading at the rated force, not the full scale of the dial; this part takes the rated force as the full scale and converts with that printed pair, so one 1 MPa division of the pointer gauge is the rated force divided by that reading. Above the full scale the band is not compared with your tolerance. The permissible error is the class you enter, as a percentage of full scale, applied at every reading; it is shown as a share of the reading. It covers the gauge only, not friction, hysteresis or the conversion to force. Part 2, defined here for each point: error of indication = (indicated − mean reference) ÷ mean reference; repeatability = (largest − smallest reference reading) ÷ mean reference; reversibility = (reference on falling load − mean reference on rising load) ÷ mean reference; zero = size of the indication after unloading ÷ the highest indicated point. A point is compared only with the limits you enter, at full precision; near a limit a value is shown with as many decimals as it takes to show on which side of the limit it lies, and very small values in scientific notation. The tool supplies no class table. It does not test a press, certify a calibration or replace an accredited calibration laboratory.