Skid Tester Calibration S885
Introductory Note
The calibration procedure which follows is based on BS 812 Partl 114:1989. However it will be replaced shortly by the European Standard EN 1097-8.
This procedure is intended to be used, together. with the Skid Tester Calibration Rig S892. This system has been designed to allow laboratories outside the UK to calibrate their Skid Testers without the major expense and inconvenience of sending Skid Testers back to the UK for this purpose.
The Skid Tester is a precision instrument and needs to be calibrated by a competent technician.
Calibration Procedure
If without pressure from the felt pads the arm fails to reach the zero position on the scale, mechanical problems exist, N.B. bearings, which must be corrected.
The following are used in calibration:
CW1 -Applied Weight 2244 g.
CW2 Small Calibration Weight 60 g.
CW3 - Large Calibration Weight 120g.
The calibrating weights should be attached to the lifting arm, after removing the cover plate.
Note:
The adjusting screw on �Type B� units requires a screwdriver applied through the access hole in the adapter nut.
�Type A� units require removal of the adapter nut assembly to access a thumb screw.
W=Wx9.806
.037xWx411
SF=.69/Vertical Displacement (mm)
Calibration Certificate
Calibration Laboratory:
Date:
Certificate Number:
Serial Number of Machine:
Manufacturer:
Mass of Swinging Arm (W1) |
Kg |
1.5 �0.03 |
|
Force of Swinging Arm (W) |
N |
14.6 �0.03 |
|
Centre of Gravity from Centre of Oscillation |
Mm |
410 �5 |
|
�F� Scale Vertical Distance |
Mm (Nominal) |
85 �0.5 |
|
Slider Force (P) |
N |
22.2 �0.05 |
|
Change in Slider Force (SF) |
N/mm |
<0.2 |
|
Sliding Distance |
mm |
76 �0.5 |
|
Length of Pointer |
mm |
305 |
|
Mass of Pointer |
gm |
=/<85 |
|
Distance from Sliding edge to axis of suspension |
Mm (Nominal) |
516 |