Keithley 2000 User Manual

Buffer statistics
The MAX AT and MIN AT values are the maximum and minimum values in the buffer. The
AVERAGE value is the mean of the buffered readings. The equation used to calculate the mean
is:
where: x
i
is a stored reading
n is the number of stored readings
The STD DEV value is the standard deviation of the buffered readings. The equation used to
calculate the standard deviation is:
where: x
i
is a stored reading
n is the number of stored readings
NOTE The Model 2000 uses IEEE-754 floating point format for math calculations.
y
X
i
i1=
n
∑
n
-----------------=
X
2
i
i1=
n
∑
1
n
---X
i
i1=
n
∑




2




–
n-1
--------------------------------------------------------------
y =
Measurement Options 3-19

Keithley 2000 Specifications

General

Digits	6.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	100 Ω to 100 MΩ
Connectivity	IEEE-488 (GPIB)
Display Type	VFD