Getting Started
Page 8
The self-test results can be maintained on screen by keeping the left arrow key pressed
when the power is turned on. If one of the self-test fails, the DLS 50 will show an error
screen with some explanation of the problem, in which case call the factory. Following
is a short description of the self-test done by the DLS 50 after a reset.
PwrOn: The self-test will show "Yes" if the last reset was caused by a power
on, and will show "No" if it was caused by the IEEE 488 interface
EPROM: Check if the checksum of the EPROM is valid.
Ladder: Check if all the ladders and the relays are functional. This test is not
as extensive as the one done by the factory, but it provides an early
warning of possible failure.
DipSw: Check if the dip switch configuration is valid. The dip switch
indicates which type of ladders are installed in the DLS 50.
NVRAM: Check if the non volatile RAM and its imbedded battery are
functional. The battery has an expected life of over 10 years, and if
necessary, can easily be replaced.
µ-Ctrl: Check if the micro-controller is functional.
After the self-test, the display will show the type of the cable and the current cable
length.
A – 12000 ft – B DLS 50
24 AWG Max: 20000 ft
Fig. 3.2 Simulated Cable Length in feet
A – 6000 ft – B DLS 50
0.4 mm PE Max: 6000 m
Fig. 3.3 Simulated Cable Length in metres
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