SMU 4140 current pulse question

Hello everyone,
I am seeking any advice or help on how to maintain stable a current pulse when its frequency is increased.
The equipment:
Chassis PXIe1078
Controller PXIe 8115
SMU: PXIe 4140 (4 channels)
The problem: I am correctly generating a 7mA - 14mA current pulse up to 20Hz but when I increase the frequency to for example 100Hz, the current signal attenuates to a 10mA - 12mA pulse, and if I keep increasing the frequency the signal becomes a complete mess.
Questions: How can I manage to stabilize the current pulse to higher frequencies without signal attenuation? Am I following a correct programming strategy from the point of view of the VI's that I am using? or should I use the "Current Pulse VI" of the DC power palette for example?
The VI: please find attached the VI that generates the current pulse. Try increasing the frequency (by reducing the time parameters in the "Delay" array)
Thanks for your kind help,
Cesar
Attachments:
SMU_4140_Current_Pulse.vi ‏34 KB

Danke fuer deine Antowrt Henrik, (my German is terrible...)
The current is passing through a 1kOhm resistor that cannot be changed to a lower value. I've checked the SMU 4140 module specs and the voltage range is -10V to 10V and thats low considering the fixed resitor value.
I might be wrong, but I think I cannot achieve my goal with this SMU module.
Still, further ideas or advices are greatly appreciated.
Greetings from Mexico,
Cesar

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