Figure 8-2 Pulse Sweep Example; Pulse Sweeps; Overheating Protection; Power Equations To Avoid Overheating - Keithley 2601 Reference Manual

Section 8: Source-Measure Concepts

Pulse sweeps

The Series 2600 can also perform the following pulse sweeps:
• Fixed voltage pulse
• Fixed current pulse
These sweeps are similar to those discussed above, except the source level at each sweep step is
a pulse instead of a constant level. The pulse width (on time) and pulse delay (off time) can be
programmed for each type of pulse mode sweep.
sweep. See
more information.
Pulse sweeps are used in applications where thermal response is measured or where sustained
power levels can damage the external Device Under Test (DUT).
Figure 8-2
Pulse sweep example

Overheating protection

Proper ventilation is required to keep the SourceMeter from overheating. Even with proper
ventilation, the SourceMeter can overheat if the ambient temperature is too high or the
SourceMeter is being operated in sink mode for long periods of time. The SourceMeter has an
over-temperature protection circuit that will turn the output off in the event that the instrument
overheats. If the output trips due to overheating, a message indicating this condition will be
displayed. You will not be able to turn the output back on until the instrument cools down.

Power equations to avoid overheating

To avoid overheating, each SourceMeter channel should not be operated in a manner that would
force it to exceed the maximum duty cycle (DC
power equation"
power pulse levels (if applicable) affect the maximum duty cycle. Exceeding the calculated
maximum duty cycle may cause the SourceMeter's over temperature protection mechanism to
engage. When this happens, an error message will be displayed, and the SourceMeter output(s)
will be disabled until the internal temperature of the SourceMeter is reduced to an acceptable
level.
You do not have to be concerned about overheating if all of the following are true:
• The SourceMeter is being used as a power source and not a power sink.
The ambient temperature is ≤ 30°C.
•
8-4
"Pulse sweeps" in Section 5 and
below. Factors such as the ambient temperature, quadrant of operation, and high
Return to Section Topics
Series 2600 System SourceMeter® Instruments Reference Manual
Figure 8-2 shows an example of a three-pulse
"Pulse concepts" described later in this section for
) computed using the
MAX
"General SourceMeter
2600S-901-01 Rev. C / January 2008