London Electronics INT-AH, Руководство пользователя

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Page 8
Features
Calibration Counter / Tamper detector
An internal totaliser counts each calibration. To see the cal count, press the left-
hand button at power-on. The ‘CAL XX’ value appears for a second or two after
you switch the meter on. The number starts at 00 and can go up to FF (255
counts). It doesn’t count changes of setpoints. It stores the total in non-volatile
memory which can’t be reset, so is useful for keeping track of the meter’s cali-
bration history.
Reset Command
The reset command clears the accumulated total. It may be accessed either
from the front panel or by external contact closure command.
Front Panel key reset command
1) Link terminal 7 to terminal 10
2) Set lockout switch ‘ON’
3) Press Down Arrow key to reset display
Remote contact closure resetting
1) Connect a normally-open contact closure switch between terminals 7 and 10
2) Set lockout switch ‘ON’
Display ‘Actual Current’ Command
The ‘display rate’ input allows you to see the instantaneous current. It may be
accessed either from the front panel or by external contact closure command.
Front Panel key Current display command
Press the UP arrow key to see actual current.
Remote contact closure rate display command
1) Connect a normally-open contact closure switch between terminals 7 and 9
2) When you make a contact closure between terminals 7 and 9, the display
will show the intantaneous value, for as long as the contact is closed.