5-26
Delta, Pulse Delta, and Differential Conductance
Model 6220/6221 User’s Manual
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Duty Cycle
Duty cycle defines the ratio between pulse “on” time and pulse “off” time during a
Pulse Delta cycle. For example, for a 25% duty cycle, the pulse would be “on”
(high) for one-quarter of the cycle, and “off” (0mA low) for three-quarters of the
cycle. Pulse Delta cycles with a short duty-cycle can be sourced to prevent heat
from adversely affecting the measurement of low power DUT.
When using a 0mA low level (which is the default), the duty cycle for the Pulse
Delta cycle is calculated as follows:
Where:
DutyCycle = Duty cycle expressed as a percent.
PulseWidth = User specified Pulse Width (in seconds).
PulseDeltaCycle = Time period (in seconds) for each Pulse Delta cycle
(see “
Pulse Delta cycle time period
”).
Pulse Delta cycle time period
Sweep output
– The time period for each Pulse Delta cycle is the same as the
sweep delay time that is set by the user when configuring the sweep.
Fixed output
– The Pulse Delta cycle (interval) is expressed as the number of
power line cycles (PLC). This PLC value must be converted into time (seconds)
as follows:
For 60Hz line power:
Pulse Delta cycle time period = Interval setting (PLC) x 16.667ms
For 50Hz line power:
Pulse Delta cycle time period = Interval setting (PLC) x 20ms
Example
– For 60Hz line power, the Pulse Delta cycle time period for an Interval
setting of 5 PLC is calculated as follows:
Pulse Delta cycle time period = 5 x 16.667ms
= 83.33ms
Configuration settings
Pulse Delta settings from the front panel are described as follows. These parame-
ters are set from the CONFIG PULSE DELTA menu that is accessed by pressing
the
CONFIG
key and then the
PULSE
key.
The equivalent remote programming commands to configure Pulse Delta are
summarized in
.
DutyCycle
PulseWidth
PulseDeltaCycle
-------------------------------------------------
100
•
=
Summary of Contents for 6220 DC
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Page 131: ...6 10 Averaging Filter Math and Buffer Model 6220 6221 User s Manual Return to Section 6 topics...
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