6-2 Buffer and Sweeps Model 6487 Reference Manual
Buffer operations
The Model 6487 has a buffer to store from one to 3000 readings. It also stores overflow
readings and the voltage source value. 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 limit tests.
Buffered data is overwritten each time the storage operation is selected. The data is
volatile — 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 and
keys and the RANGE and keys to set the number of
readings to store (1 to 3000).
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.
klqb 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).
Recall
Perform the following steps to view stored readings and buffer statistics:
1. Press RECALL. The message RDG NO. 1 is displayed. Note that the arrow annun-
ciator (↔) also turns on to indicate that additional data is available for viewing.
2. Use the RANGE and keys and the cursor and
keys to navigate through the
reading numbers and buffer statistics, reading values, voltage source values, and
timestamps (Figure 6-1). For information on how to set buffer timestamps, see
“Buffer timestamps,” page 6-3.
3. Press EXIT to return to the normal display.
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