RIGOL DS6000 Series - Manual (Page 56)

RIGOL
20 User’s Guide for RP7000 Series Active Probe
4. To replace the nickel wire
If the nickel wire of the solder-in probe head under use become damaged
or break off, you can replace a new one. The probe head nickel wire
should satisfy the following size requirement, namely the length must be
shorter than 5mm.
Note: If the length of the nickel wire is longer than 5mm, the bandwidth
specification of the probe will be effected. You can use the trim gauge
(RP7-0307) to measure and cut the nickel wire.
<5mm