Keithley 6482, Справочное руководство

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6482-901-01 Rev. A / August 2012 Return to Section Topics 6-3
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 6: Data Store
Displaying other buffer readings
To display the other readings stored in the buffer, display the memory location number. The EDIT
and keys increment and decrement the selected digit of the location number. Cursor position
is controlled by the EDIT and keys. When scrolling forward past the last stored reading, the
buffer wraps to the first stored reading. Conversely, when scrolling in reverse past the first stored
reading, the buffer wraps to the last stored reading.
The memory location number can also be entered using the 0 through 9 number keys. Position the
cursor on the appropriate digit and press the applicable number key. The cursor then moves right
to the next least significant digit. For example, to display reading #0236, position the cursor all the
way to the left (which is the most significant digit, or MSD) and press 0, 2, 3, 6. Note that if you
enter a number that exceeds the buffer size, the reading at the highest memory location is
displayed.
To exit from the data store recall mode, press the EXIT key.
Buffer statistics
With the data store in the recall mode, buffer statistics are displayed by using the DISPLAY
TOGGLE key. Use the DISPLAY TOGGLE key to sequence through the statistics and return the
Model 6482 to the normal data store recall state. Pressing the
EXIT key at any time returns the
instrument to the normal display state.
NOTE Statistics calculations will be performed on the presently selected function (MSR1, MSR2,
RATIO, or DELTA). You can display these different functions while the statistics mode is
active by pressing the appropriate function key. For example, if V/I readings are displayed
on MSR1, all buffer statistics displayed are based on those readings.
Minimum and maximum
This mode displays the minimum and maximum readings stored in the buffer. The buffer location
number and timestamp are also provided for these readings. Go to the specific buffer location to
obtain more data about the readings.
Peak-to-peak
This mode displays the peak-to-peak reading (peak-to-peak = maximum - minimum).
Average
The average mode displays the mean (average) of all measured readings stored in the buffer. The
following equations are used to calculate mean:
Where:
y
= The mean (average).
z
= The sum of the stored readings.
X
i
= A stored reading.
n
= The number of stored readings.
z
n
Σ
Xi
i=1
=
y
z
n
--- =