Starrett 3811A - Instrument Maintenance Program; Fault Analysis & Evaluation; Appendix

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• 6.2 Instrument Maintenance Program
• When testing in the Rockwell C hardness scale your error amount should
not exceed 2 Rockwell C points. Changing the spherical test tip or impact
body should be considered.
• Warranty will be VOID if unit has been dismantled by someone other
than an authorized repair person
6.3 Fault Analysis & Evaluation
Fault Appearance
Fault Analysis
Repair method
Failure to power on
Low or dead Battery
Replace the batteries
No measured value
Impact device cable failure
Replace the cable
APPENDIX
Table 1
Material
Method
Impact device
D/DC
D+15
C
G
DL
Steel and
cast steel
HRC
20～68.
5
19.3～6
7.9
20.0～6
9.5
20.6～6
8.2
HRB
38.4～9
9.6
47.7～9
9.9
37.0～9
9.9
HB
127～6
51
80～63
8
80～68
3
90～64
6
81～64
6
HV
83～97
6
80～93
7
80～99
6
80～95
0
HS
32.2～9
9.5
33.3～9
9.3
31.8～1
02.1
30.6～9
6.8
Cold
work
tool steel
HRC
20.4～6
7.1
19.8～6
8.2
20.7～6
8.2
HV
80～89
8
80～93
5
100～9
41
Stainless
steel
HRB
46.5～1
01.7
HB
85～65
5