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5-28 Delta, Pulse Delta, and Differential Conductance Model 6220/6221 User’s Manual
Return to Section 5 topics
Interval
The Pulse Delta cycle time period (interval) is expressed as a number of power
line cycles (PLC). For 60Hz one PLC is 16.667ms, and for 50Hz, one PLC is
20ms. Interval can be set from 5 PLC (default setting) to 999999 PLC.
Sweep
The sweep function of the Model 6221 can be enabled (YES) or disabled (NO).
When disabled (which is the default setting), the Model 6221 will be configured to
output a Fixed output using the programmed high and low pulse levels. When the
sweep function is enabled, the Model 6221 will be set to output a configured
sweep.
Low Measure
By default, three measurements are performed for every Pulse Delta interval. The
Model 2182A measures the voltage at pulse low, pulse high, and finally pulse low
as shown in Figure 5-7. As explained in the process for “Pulse Delta measure-
ments” on page 5-21, a 2-point measurement technique can instead be used
when pulse high may cause DUT heating. For the 2-point measurement tech-
nique, the voltage measurement for the second low pulse is not performed.
Sweep output settings
The following settings from the CONFIG PULSE DELTA menu are used for pulse
sweep output: Width, Sweep, and Low Measure.
The sweep is selected and configured from the CONFIGURE SWEEPS menu that
is accessed by pressing the CONFIG key and then the SWP key. Details on
sweeps are provided in Section 4.
It is from the CONFIGURE SWEEPS menu that Source Ranging, Count, and
Sweep Delay are set:
Source Ranging
Source range can be set to BEST (default setting), FIXED, or AUTO. The BEST
and FIXED settings are described above in “Sweep output settings”. The AUTO
setting is available for a Sweep output. With AUTO selected, the instrument auto-
matically selects the optimum (lowest) range for the sweep step.
Delay
Sweep delay defines the Pulse Delta cycle time period (in seconds). The time
period is the same for all Pulse Delta cycles. Sweep delay can be set from 1ms to
999999.999s.