Dh4-C Duplex Hand-Spikes; Tests With The Dh4-C Duplex Hand-Spikes Or Individual Leads - Megger DLRO10HD User Manual

Test Leads

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" on page 11).
LEDs L1 and L2, give information to the User that would otherwise only be available on the display:
Lamp L1
On (red)
Flashing (red)
Off
Off
For example, when the test leads are used in an Auto test mode:
TEST
1. Press .
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.
12 DLRO10HD / DLRO10HDX
Lamp L2 Description
Off Inadequate continuity at C or P contacts
Off Voltage present between contacts
On (green) Current , 1mA, test complete
On (red) Measurement fail
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