9: Frequently asked questions (FAQs) Model 2450 Interactive SourceMeter® Instrument
9-12 2450-901-01 Rev. B/September 2013
When the guard output-off state is selected and the output is turned off, the following actions occur:
• The measurement sense is changed to 2-wire sense
• The current source is selected and set to 0 A
• The voltage limit is set to 10% full scale of the present voltage range
How do I store readings into the buffer?
Readings are automatically stored into default buffer 1 (defbuffer1).
To store readings into a different buffer, you can select another buffer from the buffer indicator on the
home screen. Located to the right of the instrument active state indicator arrows, this indicator shows
the name of the active reading buffer. Select the indicator to open a menu of available buffers. Select
a buffer name in the list to make it the active reading buffer. The name of the new active reading
buffer is updated in the indicator bar. The green bar next to the buffer name indicates how full the
buffer is.
Figure 146: Model 2450 active buffer indicator expanded
For more information on buffers, including information on creating a user-defined buffer, see Reading
buffers (on page 3-10).
What should I do if I get an 5074 interlock error?
An interlock circuit is provided on the rear panel of the instrument. This circuit must be closed to
enable the Model 2450 to produce voltages greater than 38 V DC. If you try to assign a high-voltage
output and turn the source on when the interlock is not asserted, you see event code 5074, "Output
voltage limited by interlock."
The Model 2450 is provided with an interlock circuit that must be positively activated in
order for the high voltage output to be enabled. The interlock helps facilitate safe operation
of the equipment in a test system. Bypassing the interlock could expose the operator to
hazardous voltages that could result in personal injury or death.
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