User Manual

2400 Series SourceMeter
®
User’s Manual Pulse Mode Operation (Model 2430 only) 5-7
Duty Cycle= 1msec / (1msec + 9msec)
= 1msec / 10msec
= 0.10
= 10%
Based on the possible output on/off times that can be configured, the pulse duty
cycle can range from <1% to 83.5%.
NOTE Pulse Duty Cycle on the 10A range should be limited to 8% for consistent
pulses. Please see
“Pulse energy limitations (10A range),” page 5-9.
Fast pulse output
The fastest pulses are achieved by configuring the SourceMeter for the shortest
pulse width and shortest output off-time. This is accomplished by setting the mea-
surement speed to 0.004 PLC, setting the pulse delay to 0sec, disabling auto
zero, and making sure that no other operations (i.e., relative, math calculations,
store, sweep) are being performed. Please see Table 5-1 for details.
Auto zero
The output off-time can be reduced by disabling auto zero. With auto zero dis-
abled, only the signal is measured. As shown in Figure 5-3, the reference and
zero measurements (which normally are part of the off-time) are not performed.
Also note that the minimum overhead time that occurs during the off-time is
reduced to 2.9msec. Therefore, with pulse delay set to 0sec, the output off-time
can be as short as 2.9msec.
Figure 5-3
Pulse-measure timing (auto zero off)
80µs
Meas
Sig
PD
Delay = Pulse width delay, used to achieve pulse width setting.
80µs = Minimum pulse width overhead
Meas Sig = Signal measurement
1.4ms = Minimum output off-time overhead
PD = Pulse delay setting, used to determine time between pulses.
2.9ms
0V or 0A
Delay
Pulse Width
(Output On-Time)
Output Off-Time