Test Techniques & Applications; Testing Using Dh4 Duplex Handspikes; Testing Using Handspikes Or Individual Leads - Megger DLRO-10 Guide De L'utilisateur

TEST TECHNIQUES & APPLICATIONS

TESTING USING DH4 DUPLEX HANDSPIKES

Each handspike is marked with the letter P. This indicates the potential
terminals. These should be the 'inside' contacts when making a
measurement (as shown in the next section 'Testing Using Duplex
Handspikes or Individual Leads').
One of the DH4 handspikes is fitted with two lamps marked L1 and L2
and an extra lead. This lead should be plugged into the 4 mm socket next
to the main terminals on the right hand side of the instrument. These
lamps provide information to the operator, which would otherwise only
be available on the instrument display. The meaning of these lamps is
described below.
For example, using the DH4 Duplex Handspikes with the DLRO 10 in
AUTO test mode:
1. Press the TEST button on the instrument.
2. Lamp L1 will illuminate a continuous red to indicate contact
failure. See the instrument panel for details if required.
3. When all four contacts connect, L1 will extinguish.
4. No lamps will show during the test unless contact fails.
5. Lamp L2 will light a continuous green when current flow has
decayed to less that 1 mA to signal end of test.
6. Removing the probes will extinguish the green L2 (end of test) and
Light the red L1 (no contact).
Since your DLRO always ensures good contact before applying the full
test current, there will be no 'splash' to erode the contact tips. However,
should the tips become worn or blunted, they can be simply replaced by
pulling out the worn tips and inserting new ones.
14
DLRO 10 and DLRO 10X (no passbands)
Lamp L1 Lamp L2
Red Off
Flashes Red Off
Off Green
DLRO 10X ONLY if passbands set
Off Green
Off Red
TESTING USING DUPLEX HANDSPIKES OR INDIVIDUAL LEADS.
Connect the four leads as shown.
C
P
If using Duplex Handspikes ensure that the probe marked P is inside the
C probes.
Note:
When used on hazardous voltages Megger DH6 test leads must be
used.
Meaning
Inadequate contact at C
and/or P contacts
Voltage present between
contacts
Current less than 1 mA and
test complete.
Measurement Pass
Measurement Fail
C
P