Keithley 2182 Quick Reference Manual - Buffer

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

-----------------

=