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6-2
Buffer and Sweeps
Buffer operations
The Model 6487 has a buffer to store from one to 3,000 readings. It also stores overflow
readings. Each reading includes the voltage source value and 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 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
To store readings, set up the instrument for the desired configuration, then press CONFIG
followed by STORE. Set the number of readings to store (1-3000) and press ENTER.
Press the STORE key to start data storage. The asterisk (*) annunciator turns on to indicate
that the data storage operation is active. To abort storage while active, press EXIT.
Recall
To view stored readings and buffer statistics, press RECALL, then use the RANGE and
cursor keys to navigate through the reading numbers and buffer statistics, reading values,
voltage source values, and timestamps. (Use the RANGE keys to scroll through statistics
and reading values; use the cursor keys to select among readings, voltage source values,
and timestamps.) The BUFFER annunciator will be on while readings are being recalled.
Press EXIT to return to normal display.
NOTE
If the voltage source was in compliance when the reading was acquired, the
recalled front panel SRC: display will show the voltage value dimmed. Over the
GPIB, a value of -999 returned for the voltage source element indicates that the
source was in compliance.
Buffer timestamp
To change the buffer timestamp format, press MENU, select TSTAMP, then press
ENTER. Select the desired option: ABS (absolute) or DELT (delta). For ABS, each times-
tamp is referenced to the first reading stored in the buffer. The first reading always has a
timestamp of 0000000.0000. With DELT, each timestamp provides the time between the
readings.
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Страница 86: ...A Specifications...
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