max. output current using duty cycle applications

[WOBO13]

For our automotiv test applications we are using components like PXI-6040E, PXI-6251, PXI-7813R, PXI-7831R. The max. output current is specified by NI with 2,5 mA and 5 mA. We would like to test a duty cycled application channel by an analogic output. In this case do we have to calculate with the specified 2,5 / 5 mA current or can we calcuate with higher values ( 5 mA * t / T). What happens, if the value of output current  is between  specified and short current protection value.

[Duffy2007]

Hello WOBO13,

for a better help i need more information. What exactly want to you do and with which card?

The 7831r analog output are going from -10 to 10 V with 2,5mA

The 6251 analog output are going from -10 to 10 V with 5mA

The 6040 analog output are going from -10 to 10 V with 5mA

The specified current is the maximum that the analog outputs can drive so if your IC need more power you must use another card or an

power supply for driving the component.

What should be calculated?

[WOBO13]

Hello Duffy2007,

     thanks for your answere.

Using 6251 the analog output has to drive a load (50mA) which is switched on/off during 1ms/10ms.

In this case the avaraging current is 50 mA * 1 ms / 10 ms = 5 mA.

Is it possible to calculate in this way? 

[Duffy2007]

Hello WOBO,

you can not make such an calculation, because your device need 50mA to power it on, not as an average.

Do you only want to power it, then you can use the PXI-4110.