Keithley 6482, Reference Manual

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6-2 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 6: Data Store Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Data store overview
The Model 6482 has a data store (buffer) to store from 1 to 3000 voltage bias source values and
measurement readings for both channels. Each reading includes the buffer location number and a
timestamp.
The data store buffer also provides statistical data on the measured readings stored in the buffer.
These include minimum, maximum, mean, and standard deviation.
NOTE The buffer automatically stores readings for sweeps having a finite sweep count.
Front-panel data store
This topic describes basic data store (buffer) capabilities as accessed from the front panel.
Storing readings
Perform the following steps to store readings:
1. Select the measurement configuration by pressing the MSR1 , MSR2 , RATIO , or DELTA keys.
NOTE Data storage cannot be performed when the dual-channel display mode is selected.
2. Set the source values using the SRC1 and SRC2 keys, and then turn on the output.
3. Press the STORE key.
4. Use the EDIT , , , and keys to specify the number of readings to store in the buffer.
5. Press the ENTER key. The asterisk (*) indicator turns on to indicate that a data storage
operation is in process (the indicator will turn off when the storage operation is finished).
6. After the storage operation is finished, press the ON/OFF OUTPUT key to turn the output off
(the blue OUTPUT indicator will turn off).
Recalling readings
Readings stored in the buffer are displayed by pressing the RECALL key. The source and
measure readings are positioned at the left side of the display; the buffer location number and
timestamp are positioned at the right side.
NOTE
RECALL cannot be used with the dual-channel display mode. RECALL will display buffer
data of the presently selected function (MSR1, MSR2, RATIO, or DELTA). You can
display these different functions while the recall mode is active by pressing the
appropriate function key.
Buffer location number
The buffer location number indicates the memory location of the source-measure reading.
Location #0000 indicates that the displayed source-measure reading is stored at the first memory
location. If limit testing was performed, a “P” or an “F” will precede the buffer location number to
indicate the pass/fail result of the test. Limit testing is covered in
Section 10 .
Timestamp
The first source-measure reading stored in the buffer (#0000) is timestamped at 0000000.000
seconds. Subsequent readings can be recalled in absolute or DELTA timestamp format. For the
absolute format, the timestamp references readings to zero (0) seconds. For the DELTA format,
the timestamp indicates the time between the displayed reading and the reading before it. To set
the timestamp format, see
“Timestamp format,” page Section 6-4 .