6-2 Buffer Model 6485 Picoammeter Instruction Manual
Buffer operations
Model 6485 has a buffer to store from one to 2500 readings. It also stores overflow read-
ings. Each reading has a timestamp. The timestamp for each reading is referenced to the
time the measure/store process is started. In addition, recalled data includes statistical
information (maximum, minimum, peak-to-peak, average and standard deviation).
The buffer fills with the specified number of readings and stops. Readings are placed in the
buffer after any filters and/or math operations have been performed. Math operations
include relative, mX+b, m/X+b, LOG, or limits.
Buffered data is overwritten each time the storage operation is selected. The data is vola-
tile — it is not saved through a power cycle.
Measurement function changes are permissible during the storage process. Note however,
that the statistics will be based on the readings of the different measurement functions.
Store
Perform the following steps to store readings:
1. Set up the instrument for the desired configuration.
2. Press CONFIG (CONFIGURE: will be displayed).
3. Press STORE. The present buffer size (in readings) is displayed.
4. Use the cursor keys and , and the RANGE keys and to set the number of
readings to store (1 to 2500).
5. Press ENTER to save the buffer size. Press the STORE key. If in the immediate
trigger mode, the storage process will start immediately. If in the external input
trigger mode, each input trigger (or press of TRIG key) will store a reading. See
Section 7 for information on triggering.
NOTE The asterisk (*) annunciator turns on to indicate that the data storage operation
is enabled. It will turn off when the storage process is finished (buffer full).
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