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6.13 Security code: COdE
The calibration and conditioning of the
instrument may be protected by a four digit
security code which must be entered before
access to the programme menu is granted.
New instruments are programmed with the
default security code 0000 which allows
unrestricted
access
to
all
programming
functions.
To enter a new security code select 'COdE'
from the menu and press
P
which will cause
the indicator to display the current security
code. Each digit of the code can be changed
using the
Up
and
Down
push buttons, and the
P
button to move to the next digit. When the
required code has been entered press
E
to
return to the main menu. The revised security
code will be activated when the indicator is
returned to the operating mode.
If the security code is lost, access to the
programmable functions can be obtained by
moving the internal security link to the override
position. The original security code can then
be viewed by selecting 'CodE' from the main
menu and pressing
P
.
To gain access to the security code link,
remove the instrument terminal block(s) by
gently pulling. Unscrew the six screws
securing the rear panel, and lift off the panel
which will reveal the link as shown in Fig 9.
Fig 9 Location of security code override link
6.14 Over and under-range
If the range of the digital display is exceeded,
the four least significant digits will be blanked.
Under-range is indicated by '-1' and over-range
by '1'.
Under and over-range are also
indicated if the input current falls below
approximately
3.5mA
or
rises
above
approximately 21mA.
The bargraph displays an upward pointing
arrow when overrange occurs and a single
negative segment and the zero bar for
underrange.
If the instrument input current falls below 3mA
the initialisation sequence is performed as
described in section 2.
Summary of Contents for ba326c
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