Chapter 5 Installing the system

Page 5.8

5.10 Step 7: Connecting the power supply
Plug the dc power connector into plug PL1 and switch on the power. The instrument goes through the
following Power-On-Self-Test (POST) routine:
x The display shows a sequence of characters or patterns to prove that all elements of the display are
working. There is a pause of five seconds between each change of pattern.
x The program ROM is checked against a checksum. The display shows how the test is proceeding.
x Critical data are checked. The display shows the result of this check.
x The coefficients are checked. The display shows the result of this check.
x The battery-backed RAM is checked. The display indicates progress.
x Any saved programs are checked. The display shows the number of programs and their status. Note
that, for a new machine, there are no stored programs.
x If a battery is fitted, its condition is checked and reported.
Note that, when the power is switched on, the alarms may light up. You can ignore these for the moment, as
alarms are explained later in this manual. You can now proceed to configure your 7951 (see Chapters 8-11).
If the POST fails to complete, switch off the power supply and check all connections and the DIP-switch
settings. Then re-connect the power supply. If the POST still fails to complete, switch off again and contact
your supplier.