Keithley 2450 User Manual

Model 2450
Interactive SourceMeter® Instrument Reference Manual Section 3:
Functions and features
2450-901-01 Rev. B/September 2013 3-31
Using TSP commands:
The following attributes are available for each reading buffer (for example, rb.dates accesses dates
for reading buffer rb, and the number of readings in the reading buffer is accessed as rb.n).
Attribute Description
bufferVar.n
This attribute contains the number of readings in the specified
buffer. See bufferVar.n (on page 8-23).
bufferVar.readings
This attribute contains the readings stored in a specified
reading buffer. See bufferVar.readings (on page 8-24).
bufferVar.dates
This attribute contains the dates of readings stored in the
reading buffer. See bufferVar.dates (on page 8-18).
bufferVar.statuses
This attribute contains the status values of readings in the
reading buffer. See bufferVar.statuses (on page 8-33).
bufferVar.formattedreadings
This attribute contains the stored readings formatted as they
appear on the front-panel display. See
bufferVar.formattedreadings (on page 8-20).
bufferVar.sourceformattedvalues
This attribute contains the source levels formatted as they
appear on the front-panel display when the readings in the
reading buffer were acquired. See
bufferVar.sourceformattedvalues (on page 8-28).
bufferVar.sourcevalues
This attribute contains the source levels being output when
readings in the reading buffer were acquired. See
bufferVar.sourcevalues (on page 8-32).
bufferVar.sourcestatuses
This attribute contains the source status conditions of the
instrument for the reading point. bufferVar.sourcestatuses (on
page 8-29).
bufferVar.times
This attribute contains the time when the instrument made the
readings. See .bufferVar.times (on page 8-34).
bufferVar.timestamps
This attribute contains the timestamps of readings stored in
the reading buffer. See bufferVar.timestamps (on page 8-35).
bufferVar.relativetimestamps
This attribute contains the timestamps, in seconds, when each
reading occurred relative to the timestamp of reading buffer
entry number 1. See
bufferVar.relativetimestamps (on page 8-
25).
bufferVar.sourceunits
This attribute contains the units of measure of the source. See
bufferVar.sourceunits (on page 8-30).
bufferVar.seconds
This attribute contains the nonfractional seconds portion of the
timestamp when the reading was stored in UTC format. See
bufferVar.seconds (on page 8-26).
bufferVar.fractionalseconds
This attribute contains the fractional portion of the timestamp
(in seconds) when each reading occurred. See
bufferVar.fractionalseconds (on page 8-21).
Reading buffer time and date values
Time and date values are represented as a number of UTC seconds since 12:00 a.m. Jan. 1, 1970.
Use the following commands to return values in the following formats:
• Hours and minutes: bufferVar.times (on page 8-34)
• UTC seconds: bufferVar.seconds (on page 8-26)
• Month, day, year, format, or to access the timestamp table: bufferVar.dates (on page 8-18)

Keithley 2450 Specifications

General

Model	2450
Category	SourceMeter
Voltage Source Range	±200 V
Current Source Range	±1 A
DC Voltage	200 V
DC Current	1 A
Power Output	20 W
Resolution	6.5 digits
Display	5-inch capacitive touchscreen
Operating Temperature	0°C to 50°C
Connectivity	USB, LAN, GPIB
Dimensions	213 mm × 88 mm × 370 mm