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6.16 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
instrument 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
.
Fig 8 Location of security code override link
To gain access to the security code link, remove
the instrument control cover by undoing the two 'C'
screws - see Fig 4. If the instrument is fitted with
external push-buttons the connecting ribbon cable
should be un-plugged. The security code
override link is located on the inner row of the five
pin connector shown in Fig 8.
6.17 Over and under-range
If the rate display range is exceeded, the four least
significant digits will be blanked. Under-range is
indicated by a flashing '-1' and over-range by '1'.
Under and over-range are also indicated if the
input current falls below approximately 3.6mA or
rises above approximately 21mA.
If the input current falls below approximately 3mA
the instrument initialisation sequence is performed
as described in section 2.
When the total display exceeds 99999999 it will
automatically roll-over to zero and continue
counting. If this is likely to happen the grand total
should be reset at the start of the operation, the
most significant eight digits of the grand total will
then indicate how many times the total display has
rolled-over. The most significant eight digits of the
grand total can be viewed by pressing the
E
and
Up
buttons simultaneously Up to 108 roll-overs
can be counted.
