1-38 Return to Section Topics 2400S-903-01 Rev. E / September 2011
Section 1: Introduction Series 2400 SourceMeter® Quick Start Guide
10A range limitations
Pulse width
The maximum pulse width for the 10A range (source or measure) is 2.5msec. If the setting is
>2.5msec
, the SourceMeter will limit the pulse width to 2.5msec.
Charge energy consumption
Energy for pulses are provided by an internal bank of capacitors. Each pulse consumes energy
from the capacitors. The following pulse will not occur until the capacitors have had enough time to
sufficiently recharge.
Charge energy consumption by a pulse depends on the pulse current and pulse width. A long high
current pulse consumes more energy than a short low current pulse. On all but the 10A range
(source or measure), charge energy consumption is low enough to allow the capacitors sufficient
time to recharge between pulses. The result is consistent pulse output.
On the 10A range (source or measure), the configured pul
se period will be consistent as long as
the pulse duty cycle is 8% or less. Above 8%, the capacitors will not be able to recharge
sufficiently before the next pulse is due. As a result, the pulse period becomes longer and
inconsistent.
If a consistent pulse period is not required for your test, you can use the 10A range to output fast,
high energy (>8% duty c
ycle) pulses. With pulse delay set to 0sec, each subsequent pulse will
output as soon as the capacitors become sufficiently charged.
Pulse Mode configuration
Select Pulse Mode, set pulse width and pulse delay
Use the following menu sequence to s
elect the Pulse Mode:
Press CONFIG > press SOURCE V (or I) >
select SHAPE > select PULSE
After PULSE is selected, use the following menu
items to program pulse parameters:
DELAY - Use to set the pulse delay for the output
off-time (0 to 9999.99900 sec).
PULSE WIDTH - Use to set the pulse width (0.15ms to 5.00ms). N
ote that pulse width will
internally limit to 2.5ms on the 10A range (source or measure).
Set pulse measurement speed
With the Pulse Mode selected, pulse measurement speed can be set from 0.004 to 0.1 PLC. To
set speed, press SPEED and enter the desired NPLC value.
Set pulse count
Arm count and trigger count determines how
many pulses will be output. In general, pulse count is
the product of arm count and trigger count. If arm count is set to infinite, pulses will output
continuously. Note that the product of the finite count values cannot exceed 2500.
Arm count - Use the following menu se
quence to set the arm count:
Press CONFIG > press TRIG > select ARM LA
YER > select COUNT
After selecting COUNT, the following menu items are displayed:
FINITE - Use to set arm count to a finite value.
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