5-36 Delta, Pulse Delta, and Differential Conductance Model 6220/6221 Reference Manual
Return to Section 5 topics
Fixed output
Figure 5-10 shows one Pulse Delta cycle for a Fixed output. As shown, the Model
6221 outputs a low pulse, a high pulse, and then another low pulse during every
Pulse Delta cycle. The pulse width is adjustable and is the same for all high and
low pulses. The cycle interval is also adjustable and is based on the set number of
power line cycles. The Pulse Delta interval shown in Figure 5-10 is set for 5 PLC
(power line cycles), which is the default setting. After the set interval expires, the
next Pulse Delta cycle starts (if pulse count is >1).
Pulses are synchronized to the frequency of the power line voltage. When Pulse
Delta is started, the three pulses (low, high, and low) are generated on the posi-
tive-going edges of the first three power line cycles. For the remaining power line
cycles in the interval, the output remains at the I-Low level.
Figure 5-10
Pulse timing
I-High
I-Low
Power
Line
Voltage
1
2
Pulse
Width
3
Pulse
Width
3
Pulse
Width
3
One Line Cycle
4
One Line Cycle
4
One Line Cycle
4
One Line Cycle
4
Low High Low
One Line Cycle
4
Notes:
1) I-High can be set from -105mA to +105mA (default is 1mA).
2) I-Low can be set from -105mA to +105mA (default is 0mA).
3) Pulse Width can be set from 50μs to 12ms (default is 110μs).
4) One 60Hz power line cycle = 16.667ms (1/60)
One 50Hz power line cylce = 20ms (1/50)
5) With Interval set to 5 PLC (power line cycles):
60Hz: One Pulse Delta cycle = 83.33ms (5/60)
50Hz: One Pulse Delta cycle = 100ms (5/50)
6) Interval can be set from 5 to 999999 PLC (default is 5 PLC).
One Pulse Delta Cycle
(Interval = 5 PLC)
5, 6
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