Input Capacitance of the USB 6008

[nickv1011]

Does anybody know the input capacitance of the NI USB 6008? Im creating a circuit that mimics a 10x probe whose design requires the value of the "oscilloscope" input capacitance, or in this case, the USB 6008 input capacitance.

Thanks so much!

[johnsold]

With the low input resistance (144 kohms) the capacitance does not matter much. Any realistic value of input capacitance will have a time constant shorter than is meaningful for the device bandwidth.

Also note that the input impedance is terminated in about 1.4 V.  See the circuit in Figure 7 of the User Manual.

Lynn