15
16
Note: Measurements should always be made with the
temperature of the room, of the part and of the instrument
constant and, where possible, at 20°C.
Table 1. Relationship between roughness and cut-off.
Calibration
You are recommended not to use the specimen plate more than is
strictly necessary, to avoid deterioration caused by possible
scoring of the stylus which could falsify the roughness values.
Recharging And Replacing The Accumulator
When the accumulator charge is low, the instrument signals on
the extreme right of the first line of the display. The instrument
should then be connected, as quickly as possible, to the power
supply provided; then plug the power supply into a mains outlet,
after making sure that the voltage is that required (220V 50/60Hz).
The power supply plug should be inserted in the socket shown in
figure 2, on the rear of the ISR-S400, and making sure that it is
plugged in fully; leave to charge for at least 3 hours. A full charge
takes 4 hours. No problem will arise if the power supply is left
connected for more than this time, because it is provided with an
automatic charge control means.
It is possible to use the instrument even while the accumulator
battery is recharging.
Note: do not store the instrument for long periods with the
accumulator battery discharged, as it will become damaged.
If left idle for long periods, check the charge level at least
once every 30 days. If the accumulator discharges too
deeply, it will not be possible to switch the roughness tester
on. Do not replace the accumulator with zinc-carbon or
alkaline batteries. These batteries can explode if you try to
recharge them and, in any case, may cause the instrument
damage when their charge is low.
1
2
T h e a c c u m u l a t o r c a n w i t h s t a n d a c e r t a i n n u m b e r o f
charge/discharge cycles, beyond which it can no longer be
charged and must be replaced. Use an 8.4V-170mAh NiCd or
NiMH type accumulator, PP3 format.
Remove the six base fixing screw of the instrument cover then
pull the cover from the top,
detach the accumulator from the
button connection and insert the new one. Make sure that the
accumulator does not touch the contacts with the polarities
inverted!
Insert again the cover and fix it with the screws to the instrument
base.
