Wahl Digi-Stem DST600 Series User Manual page 6

3.4.4. Install the battery with polarity as indicated on battery holder.
3.4.5. Replace cover on Digi-Stem enclosure and secure with four screws
tightened to a force of 4 to 5 in-lbs. of torque.
3.5. Ferrite Installation
The Wahl DST600 CE compliance requires installation of 2 clamp-on
ferrites around the internal wiring. For other DST6xx series, 2 clamp-on
ferrites are included to minimize RFI susceptibility. These ferrites should
be placed around the internal wiring. These are normally installed when
the system is delivered, however on units with extremely long probes or
when meters are shipped without a probe, these may need to be installed
by the end-user.
There is 1 large ferrite and 1 small ferrite that are required to comply with
the CE directive on model DST600, and are recommended to be installed
for EMI immunity. See Fig. 2 for reference. The wires coming from the
probe should be passed through the large ferrite, looped around once and
passed through again. Also, route the green/yellow PCB ground lead
through the ferrite once, with the connector toward the probe end of the
ferrite. The large ferrite can then be snapped closed, making sure that the
wires are not pinched. The small ferrite is then installed on the remaining
length of all wires, toward the connector with it passing through the ferrite
only once. The wire does not have to loop through the small ferrite. The
small ferrite can then be snapped closed, making sure that the wires are
not pinched. Cable ties can then be installed as shown (see Fig. 3) to
secure the ferrites in place.
Ground Wire Not
Looped
Note:
Ferrites Shown
Open
DST600 Series USER MANUAL
Probe Wire Loop 1 Time
Large Ferrite
Fig. 2
Fig. 3
6 of 20
Small Ferrite
Connector P1