Can I change threshold voltage of NI 782258-01 and USB-6363 in pulse counting mode?

[KST_physics]

Dear Engineers,

I am currently using the NI 782258-01 and USB-6363 models in my laboratory.

The pulses I wish to count have an amplitude of approximately -200 mV, which appears to be below the detectable range of the default Pulse Counting settings. According to the specifications, the devices can detect analog signals down to 0.1V. When I attempted to use the ci_count_edge_thresh_voltage command, I received an error indicating that this command is not supported by these devices.

I would prefer to use the pulse counting mode without the need for an inverting amplifier if possible. Is there a way to achieve this?

Thank you in advance for your assistance.

[ZYOng · Accepted solution]

Unfortunately, you cannot use analog channels in counter tasks. NI DAQ only supports 5V TTL signal. The DIO and counters can't capture non-TTL signals without any external circuits. 

[KST_physics]

Does this mean that with the equipment I have, it is not possible to read -200mV pulses on the counting channel?