5-8 Pulse Mode Operation (Model 2430 only) 2400 Series SourceMeter
®
User’s Manual
Pulse-only
The fastest pulses are achieved by disabling measurements altogether. With the signal not
measured, as shown in Figure 5-4, the pulse width can be as short as the 150µsec over-
head. With reference and zero not measured, the output off-time can be as short as the
1.1msec overhead.
NOTE Measurements cannot be disabled from the front panel. For remote operation,
measurements can be disabled by sending the [SENSe]:FUNCtion:OFF:ALL
command. See Section 18 for details.
Figure 5-4
Pulse-only timing
Pulse jitter
Pulse jitter is defined as the variance in the configured pulse on and off times. The amount
of jitter that can occur depends on how the SourceMeter is set up. For the least amount of
jitter (<5µsec for pulse on-time), turn off the display. See Section 1, “Disabling front panel
display.” With the display on, pulse on-time jitter depends on the pulse width. For pulses
<1msec wide, on-time jitter can be up to 20µsec. For pulses >1msec wide, on-time jitter is
5–40µsec.
Jitter for pulse off-time can be as high as 1msec, depending on the integration rate, auto
zero, and on-time. In general, the higher the off-time, the higher the jitter.
PD
Delay = Pulse width delay
150µs = Minimum pulse width overhead
1.1ms = Minimum output off-time overhead
PD = Pulse delay setting
1.1ms
0V or 0A
Pulse Width
(Output On-Time)
Output Off-Time
Delay 150µs
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