DLS DLS 400A, Operating Manual

Page: 21 / 226

GETTING STARTED
Page 9
3.8 Connecting Power to the DLS 400
Connect the DLS 400 to an AC power supply via the power cable at the back of the unit.
The unit can work with any voltage between 100 and 240 V
RMS
±10% and a frequency of
50 or 60 Hz.
The power LED indicates when power is connected and the unit is switched on.
3.9 DLS 400 Self-Test
When you switch on the power or issue a reset, the DLS 400 does a series of self-tests. If
any of the self-tests fail, the DLS 400 will flash the POWER LED red, in which case you
should call the factory.
Following is a short description of some of the self-tests the DLS 400 performs:
• Checks if the checksum of the EPROM is valid.
• Checks if the non-volatile RAM and its self-contained battery are functional.
The battery has an expected life of over 10 years, and, if necessary, it can be eas-
ily replaced.
• Checks if the micro-controller is functional.
After the self-tests, the DLS 400 re-establishes the loop that was in use before the unit was
turned off or reset, but an impairments card, if present, resets itself, so that NO impair-
ments are put out.
3.10 National Instruments GPIB Card and Software Instal-
lation
Operation with an IEEE 488 interface requires installation of a National Instruments GPIB
card and the associated GPIB software drivers.
Note: The GPIB software drivers must be installed before the installation of the
DLS&NSA software.
If you are using an RS–232 interface, the NI card and drivers are not required.