Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-37
Return to Section 5 topics
Sweep output
The sweep feature of the Model 6221 can be used to output a series of pulses that
allow the use of different levels for the high pulses. Each high pulse returns to the
programmed low pulse level. The low level is the same for all pulses.
Like the Fixed output shown in Figure 5-10, 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 5-11.
Staircase sweep – Figure 5-11A shows an example of a staircase Sweep
output. 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 5-11B 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 5-11C 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.
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