Ametek TR-2100, Руководство по эксплуатации

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TR-2100 User Manual 35
TR-2100 Connection
To make a connection, click on the Connect button. The program will attempt a connection
by looking for a CLI command prompt. If this is successful, it will attempt to read the
EEPROM chip on the first board of the system. Once the values have been read from the
board, the actual input values will start to be displayed. There are two main parts to the
calibration process - offset and gain.
Offset Adjustment
The offset should ALWAYS be adjusted first because it will affect the subsequent accuracy
of the gain offset. To set the offset, it is important that no signal is going into the back of the
recorder. The best way to ensure this is by using a shorting connector that links the positive
and negative terminals of each analogue input.
At this point, the actual level that is being read by the recorder is shown in the
actual bits
value column. The actual bits value is what the analogue to digital converter has provided
to the TR-2100. The actual value that the TR-2100 will end up reporting is the value in the
resultant bits column. This is the value that is required to be as near as possible to 0. The
value in the card offset field is the actual offset value which will be sent to the input board
when it is updated.
The option is available to adjust the offset for all the channels at once, or the adjustment can
be changed for each individual channel. The
resultant bits field has two colors to reflect
status. When the field is red, the resultant bits field is not 0. When the field is green, the
resultant bits field is 0. This is a visual aid to help in determining that the offset adjustment
is correct. However, even after adjustment some of the fields may flash between red and
green. It may be necessary to adjust that channel in that case, however as long as all fields
are displaying 0 or close to 0, it can be assumed that the offset has been calibrated.