| Dial Indicators JIS B 7503: 1997 ( Japan Industrial Standards ) |
 Methods of measuring of performance |
| No. |
Item |
Measuring method |
Illustration |
Measuring instrument |
| 1 |
Indication
error |
Holding the plunger of the dial
gauge vertically and downward,
carry out the following procedure
setting the reading of dial gauge
at the zero point. |
|
Press in the plunger 1/10 by
1/10 revolution up to two revo-
lutions from the zero point, 1/2
by 1/2 revolution up to five revo-
lutions and 1 by 1revolution up to
the end point of the measuring
range after exceeding five revo-
lutions and, returning back the
plunger in the same state, read
the same measuring points as in
the pressing in direction. Obtain
the error from the error diagram
made as a result of the reading in
both directions(see Attached Fig.1). |
|
 |
Micrometer head or lengh mea-
suring instrument of 0.5µm or
under in scale interval and
instrumental error of ±1µm
and supporting stand for the
dial gauge of 0.001mm and
0.002mm in scale interval and
2mm or under in measuring
range.
For other dial gauges from the
above, micrometer head or
length measuring instruments
of 1µm or under in scale inter-
val and ±1µm in instrumental
error and measuring stand. |
|
| 2 |
Adjacent
error |
| 3 |
Retrace
error |
| 4 |
Repeata-
bility |
Applying the contact point verti-
cally on the upper surface of the
measuring stand, obtain the maxi-
mum difference between the indi-
cations at every times when the
plunger is operated rapidly and
slowly five times at an arbitrary
position in the measuring range. |
|
 |
Measuring stand.
Supporting stand. |
|
| 5 |
Measuring
Force |
Hold the dial gauge whose plunger
is placed vertically and downward,
transfer the plunger up-and-down-
ward continuously and slowly to
measure the measuring forces at
the zero point, center and end point
of the measuring range. |
|
 |
Supporting stand.
Upper dish spring type indica-
ting balance ( 2g or under in
scale interval ) or force meter
( 0.02N or under in sensitivity ). |
|
| Maximum allowable error of indication |
|
Scale interval and measuring range |
| 0.01mm |
0.002mm |
0.001mm |
| Measuring range |
10mm max. |
2mm max. |
Over 2mm, and
less than 10mm |
1mm max. |
Over 1mm, and
less than 2mm |
Over 2mm, and
less than 5mm |
| Retrace Error ( µm ) |
5 |
3 |
4 |
3 |
3 |
4 |
| Repeatability ( µm ) |
5 |
0.5 |
1 |
0.5 |
0.5 |
1 |
Indication
error ( µm ) |
1/10 revolution (1) |
8 |
4 |
5 |
2.5 |
4 |
5 |
| 1/2 revolution |
±9 |
±5 |
±6 |
±3 |
±5 |
±6 |
| One revolution |
±10 |
±6 |
±7 |
±4 |
±6 |
±7 |
| Two revolution |
±15 |
±6 |
±8 |
±4 |
±6 |
±8 |
| Whole measuring range |
±15 |
±7 |
±12 |
±5 |
±7 |
±10 |
|
| Note: (1) |
Adjacent error. |
| Remark: |
The value in this table shall be at 20ºC. |
|
|
| Indication error diagram |
Design and specifications are subject to change without notice for future
improvement.