Starrett SR200 Surface Roughness Tester - Manual (Page 14)

3.2 SR200 Specifications subject to change
Making a measurement
Note 1: If the pickup has been changed or the instrument is being used for the first time, the instrument
should be calibrated (see Chapter 7).
Note 2: Successful use of the SR200 will only be possible if it is operated on a surface free from external
vibration - see also operating notes in Chapter 5.
Switching the SR200 ON
Pressing the SCROLL  key brings the display on and the previously selected set-up is
displayed (provided power has been continuously present). The display is automatically turned
off if the instrument is not used for 30 seconds.
If the battery is dead or has been removed, the previously selected set-up is lost. When a
battery has been replaced and the SCROLL  key is pressed, the start up message will display
for 2 seconds and then the default settings are restored.
The default settings are
Parameter: Ra
Cut-off: 0.8mm
Evaluation length: 4.0mm
Range: 100mm
Data dump evaluation length: 4.0mm
Data dump range: 100mm
No parameter/graph selected for printout
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Filter Gaussian
If the user wishes to change any of these settings, this can be carried out using the SCROLL 
and SELECT  keys (see Chapter 4 for more detail)
Press the MEASURE  key. When the measurement is completed the pickup returns and the
results are displayed on the screen (see example below):
GaussLc 0.80mm
Eval Length 25.0mm
Ra
= 0.00µm
Rz = 0.00µm
Rt = 0.00µm
Rp = 0.00µm
RSmm = 0.00µm
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