Keithley 2182, Краткое руководство пользователя, Страница: 20 / 30

14 Quick Reference Guide
Features to enhance DUT testing
Buffer
The Model 2182 has a buffer to store from two to 1024 readings and units. It also stores
the channel number for step/scan readings and overflow readings. In addition, recalled
data includes statistical information (minimum, maximum, 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 math operations are performed. Math
operations include Relative, Ratio or Delta, and mX+b or Percent.
Storing readings
To store readings, press STORE, key in the number of readings to store, and press
ENTER. The star (*) annunciator indicates that the buffer is enabled. If in the immediate
trigger mode, the storage process will start immediately. If in the external trigger mode,
each input trigger (or press of TRIG key) will store a reading.
Recalling readings
To recall readings, press the RECALL key. The BUFFER annunciator turns on to indicate
that stored readings are being displayed. The arrow annunciator (
↔
) also turns on to
indicate that additional data is available for viewing. Use the RANGE and cursor keys to
navigate through the reading numbers, reading values, and buffer statistics. For any of the
buffer statistics (maximum, minimum, peak-to-peak, average, standard deviation), the
STAT annunciator is on. To return to the normal display, press EXIT.
Buffer statistics
• MIN and MAX provide the minimum and maximum readings stored in the buffer.
It also indicates the buffer location of these readings.
• The Peak-to-Peak reading is the absolute value of the difference between the MAX
and MIN readings. It is calculated as follows:
Peak-to-Peak = |MAX - MIN|
• Average is the mean of the buffer readings. Mean is calculated as follows:
where: Xi is a stored reading.
n is the number of stored readings.
y
X
i
i 1 =
n
∑
n
----------------- =