User manual

Model 6220/6221 User’s Manual Delta, Pulse Delta, and Differential Conductance 5-23
Return to Section 5 topics
Like the Fixed output shown in Figure 5-8, a Sweep output is synchronized to the
frequency of the power line voltage, and the pulse width is adjustable and is the
same for all pulses.
The three available sweeps include (1) staircase sweep, (2) logarithmic sweep,
and (3) custom sweep. Examples of these Sweep outputs are shown in
Figure 5-9.
Staircase sweep – Figure 5-9A shows an example of a staircase Sweep out-
put. The sweep is configured to start high pulses at 2mA and staircase to
10mA in 2mA steps. The low pulse level for this sweep is 0mA.
Logarithmic sweep – Figure 5-9B shows an example of a logarithmic Sweep
output. The sweep is configured to output five high pulses (points). The first
high pulse starts at 1mA and logarithmically steps to 10mA. The low pulse
level for this sweep is 0mA.
Custom sweep – Figure 5-9C shows an example of a custom Sweep output.
The sweep is configured to output five high pulses (points). The level for each
high pulse is specified by the user. The high pulse levels for this output are
1mA, 2mA, 4mA, 8mA, and 16mA. The low pulse level for this sweep is 0mA.
Notice that the time period for each Pulse Delta cycle is determined by the set
sweep delay. The sweep (including sweep delay) is configured from the
CONFIGURE SWEEPS menu. See Section 4 for details.