Keithley 2461 Reference Manual

Model 2461
Interactive SourceMeter® Instrument Reference Manual Section 9:
Frequently asked questions (FAQs)
2461-901-01 A/November 2015 9-15
Why do I keep seeing the "Undefined header" error?
When you are using the SCPI command language, you may see the –113, "Undefined header," error.
This error indicates that what you sent to the instrument did not contain a recognizable command
name. The most likely causes for this are:
• A missing space between the command and its parameter. There must be one or more spaces
between the command and its parameter. For example,
:disp:volt:digits5
The correct entry is
:disp:volt:digits 5
• Incorrect short or long form. Check the SCPI command reference (on page 6-1) documentation
for the correct command name.
• Spaces in the command name. You cannot use spaces in the command name. For example:
syst: err?
The correct entry is:
:syst:err?
Why do I see the "incompatible settings" message?
The "Continuous measurements have been terminated because of incompatible settings" message
indicates that the combination of settings that are presently configured make it impossible for the
instrument to make a valid measurement.
To resolve this problem, make changes to your settings.
Why do I see the "Query interrupted" error?
This error occurs when you have sent a valid query to the instrument, then send it another command
or query or a Group Execute Trigger (GET) before it has had a chance to send the entire response
message (including the line-feed/EOI terminator). The most likely causes are:
• Sending a query to the instrument and then sending another command or query before reading
the response to the first query. For example, the following sequence of commands causes an
error -410:
syst:err?
*opc?
You must read the response to syst:err? before sending another command or query.
• Incorrectly configured IEEE 488 driver. The driver must be configured so that when talking on the
bus it sends line-feed with EOI as the terminator, and when listening on the bus it expects line-
feed with EOI as the terminator. See the reference manual for your particular IEEE 488 interface.

Keithley 2461 Specifications

General

Maximum Current	7 A
Power	100 W
Resolution	6.5 digits
Source Measure Unit (SMU)	Yes
DC Voltage	100 V
Maximum Voltage	100 V
Display	5-inch capacitive touchscreen
Connectivity	USB, GPIB
Software	TSP
DC Current	7 A
Current Source Range	0 to 7 A
Voltage Measurement Range	100 mV to 100 V
Current Measurement Range	10 nA to 7 A
Voltage Measurement Resolution	100 nV