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Mitutoyo's Response to Dial Indicator Standard B7503: 2011
• We guarantee the accuracy of completed products by inspecting them in the vertical posture. Standard-attached inspection certificate includes inspection data.
• We issue paid-for inspection certificates for horizontal or opposite posture if required.
• The old JIS Standard indicates that “the uncertainty of calibration” is evaluated inclusively. On the other hand, the new JIS Standard indicates that conformity or
nonconformity to specification is verified based on JIS B 0641-1 and that it is preferred that the uncertainty is evaluated based on ISO/TS 14253-2 and ISO/IEC Guide
98. Therefore, we perform shipping inspection of dial indicators inclusive of the uncertainty of calibration as usual.
Dial Indicator Standard B7503 : 2011 (Extract from JIS/Japanese Industrial Standards)
Item Calibration method Diagram of calibration setup Tools for calibration
in vertical posture (example) (example)
Indication error Hold the dial indicator with its plunger set vertically downward, Dial indicator For 0.01 mm graduation dial indicators: A
Retrace error retract the plunger (retraction direction) to set the dial hand at micrometer head or other measuring unit with
the zero point, and determine the indication error at the below- Supporting stand 0.5 m graduation or less and instrumental
mentioned measurement points with reference to the dial Micrometer head or other error of ±1 m and a supporting stand. For dial
graduations. length measuring unit indicators other than the above: A micrometer
- Every 1/10 revolution for the first two revolutions head or other measuring unit with 1 m
- Every half revolution for the next five revolutions graduation or less and ±1 m instrumental error
- Every revolution for the next 25 revolutions and a supporting stand.
- Every 5 revolutions for after the 25th revolution
For one revolution type dial indicators and indicators whose F
graduations are not factors of 10, determine the indication
errors at the closest measurement points mentioned above.
Next, retract the plunger more than three graduations over
the entire measuring range, reverse the plunger displacement
(extension direction), and determine the indication errors at
the same points measured during plunger retraction. Then
determine the indication errors and the retrace errors with
reference to the bidirectional indication errors thus obtained.
When automatically reading errors by automatic inspection
machine, determine the gap between the dial hand and the
graduation mark with reference to the displacement of the
measuring instrument.
Repeatability Apply the contact point of the dial indicator perpendicularly Dial indicator Measuring stage
to the upper face of a measuring stage, retract and extend Supporting stand
the plunger quickly and slowly five times at a desired position Supporting stand
within the measuring range and determine the maximum Measuring stage
difference between the five indications obtained.
Dial indicator
Measuring Holding a dial indicator, retract and extend the plunger Supporting stand Unit: µm
Force continuously and gradually, and measure the measuring force Top pan type spring scale Supporting stand
at the zero, middle and end points in the measuring range. Top pan type spring scale (graduation: 0.02 N or
The largest value: maximum measurement force less) or force gauge (sensitivity: 0.02 N or less)
The smallest value: minimum measurement force
The maximum difference in contact force measured when the
plunger is retracting and extending at the same measuring
position: difference in the measurement force
Maximum Permissible Error
Maximum permissible error (MPE) by measurement characteristics Maximum permissible error (MPE) by measurement
-- dial indicators with the bezel dia. 50 mm or more characteristics --dial indicators with the bezel dia. 50 mm or
less and back plunger type dial indicators
Graduation (mm) 0.01 0.005 0.001 0.01 0.005 0.002 0.001
Measuring range 1 or less Over 1 Over 3 Over 5 Over 10 Over 20 Over 30 Over 50 1 or less Over 1 Over 2 1 or less Over 1 Over 3 Over 5 5 or less 1 or less 1 or less
(mm) and up and up and up and up and up and up and up 5 or less and up and up and up and up and up
to 10 to 20 to 30 to 50 to 100 to 10
to 3 to 5 to 2 to 5 to 3 to 5
Retrace error 3 3 3 3 5 7 8 9 3 2 2 3 4 4 4 5 3.5 2.5 2
Indication errorRepeatability 3 3 3 3 4 5 5 5 3 0.5 0.5 1 3 3 3 3 3 1 1
Arbitrary 1/10 5 5 5 5 8 10 10 12 5 2 2 3.5 8 8 8 9 6 2.5 2.5
revolution 8 8 9 9 10 12 12 17 9 3.5 4 5 11 11 12 12 9 4.5 4
Arbitrary 1/2 8 9 10 10 15 15 15 20 10 4 5 6 12 12 14 14 10 5 4.5
revolution
Arbitrary One 8 10 12 15 25 30 40 50 12 5 7 10 15 16 18 20 12 6 5
revolution
Entire
measuring
range
MPE for one revolution type dial indicators does not define the indication error of arbitrary 1/2 and 1 revolution.
Notes: (1) Values in the table above apply at 20C, which JIS B0680 defines as the standard temperature.
(2) The measurement characteristics of a dial indicator have to meet both maximum permissible error (MPE) and measurement force permissible limits (MPL) at any position within
the measuring range in any posture when the measurement characteristics are not specified by the manufacturer.
F-76
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