2.5
RMP400 basics
Enhanced trigger filter
Probes subjected to high levels of vibration or shock loads may output signals without having
contacted any surface. The enhanced trigger filter improves the probe’s resistance to these effects.
When the filter is enabled, a constant 8 ms or 16 ms delay is introduced to the probe’s output. The
factory setting is 8 ms. If false triggering is noticed, then consider increasing the filter delay to 16 ms.
Auto-reset function
In previous strain gauge products, the probe was required to be turned off during reorientation moves.
The auto-reset function in the RMP400 can compensate for stylus forces, resulting from changes in
probe orientation, that can cause the probe to trigger.
This feature is controlled by solid state accelerometers and is suitable for applications where axial and
radial reorientation of the probe is applied.
To achieve optimum metrology performance when the auto-reset function is turned on, a dwell is
recommended before making a programmed move that follows any reorientation of the probe.
When using a recommended carbon fibre stylus of up to 150 mm in length, a 0.2 second dwell is
necessary. In most applications the machine response time will adequately provide this.
When using a stylus longer than 150 mm, a heavy stylus or any other stylus configuration, it is
recommended that the RMP400 should be turned off during reorientation moves. (see page 2.10,
“Recommended styli”, for further information).
When in
“auto-reset”
mode, the probe will not trigger when moved below a speed of 3 mm/min.
NOTE:
Speeds below 3 mm/min commonly occur when manually moving the probe using the
handwheel with a very fine feedrate.
Multiple probe mode
The RMP400 can be configured, using Trigger Logic, to allow multiple radio probes in
“spin on/spin
off”
to be used with a single RMI or RMI-Q.
Up to four RMP400 probes can be used with a single RMI-Q in “
radio on/radio off
” mode. For further
details of this functionality, refer to the
RMI-Q radio machine interface
installation guide (Renishaw part
no. H-5687-8504).
NOTES:
Multiple probe mode is a function of the RMP400. As such, the option will not appear when the
“radio
on”
option has been selected.
RMP400 probes which are set to “
multiple probe mode on
” can coexist alongside any number of
RMP400 probes set to
“multiple probe mode off”
.
