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DLRO10HD and DLRO10HDX
12
Test Leads
Connection to a Test Piece
Connect the test leads to the test piece in the Kelvin arrangement as shown:
P
G
<30V AC WITHOUT
TERMINAL COVER
CAT RATED WHEN
USED WITH MEGGER
TERMINAL COVER
The image shows the correct test lead connection of the current (C1, C2) and potential probes (P1, P2) to a test
piece. To make sure test readings are accurate, the current terminals (C1 and C2) must be connected outside of
the potential terminals (P1 and P2).
DH4-C Duplex Hand-spikes
Each hand-spike is marked with the letter
P
(potential terminals). These should always be the
inside
contacts
when a test measurement is taken.
One of the test lead connectors has two LEDs (
L1
and
L2
) and an LED driver cable. The LED driver cable plugs into
the terminal next to terminal
P2
(see
Connection to the Instrument (page 11)
).
LEDs
L1
and
L2
, give information to the User that would otherwise only be available on the display:
Lamp L1
Lamp L2
Description
On (red)
Off
Inadequate continuity at C or P contacts
Flashing (red)
Off
Voltage present between contacts
Off
On (green)
Current, 1mA, test complete
Off
On (red)
Measurement fail
For example, when the test leads are used in an Auto test mode:
1. Press
TEST
.
2.
L1
shows a steady red to show there is a contact failure.
3. When all four contacts are connected,
L1
goes Off.
4. No LEDs show in a test, unless contact fails.
5. To signal end of test,
L2
shows a steady green when the current flow has decayed to less than 1 mA.
6. When the test leads are removed from the test piece,
L2
goes Off (end of test) and
L1
shows red (no contact).
When the DH4-C Duplex Hand-spikes are used, the instrument always makes sure that there is a good contact
before the full test current is applied, so there should be no erosion of the contact tips. However, if the tips
become worn or blunted, they can be replaced. Pull out the worn tips and install new ones.
Tests with the DH4-C Duplex Hand-spikes or Individual Leads
Connect the four leads as shown. In all cases make sure that the potential probes (P1 and P2) are inside the
current (C1 and C2) probes.
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