Installation guide

Programming with the PicoScope 4000 Series (A API)6

3.3

Channel selection

You can switch each channel on and off, and set its coupling mode to either AC or DC,

using the ps4000aSetChannel function.

DC coupling:

The scope accepts all input frequencies from zero (DC) up to its

maximum analog bandwidth.

AC coupling:

The scope accepts input frequencies from a few hertz up to its

maximum analog bandwidth. The lower –3dB cutoff frequency is

about 1 hertz.

3.4

Triggering

PicoScope 4000 Series PC Oscilloscopes can either start collecting data immediately, or

be programmed to wait for a trigger event to occur. In both cases you need to use the

PicoScope 4000 trigger functions:

ps4000aSetTriggerChannelConditions

ps4000aSetTriggerChannelDirections

ps4000aSetTriggerChannelProperties

ps4000aSetTriggerDelay (optional)

These can be run collectively by calling ps4000aSetSimpleTrigger, or singly.

A trigger event can occur when one of the signal or trigger input channels crosses a

threshold voltage on either a rising or a falling edge.

The driver supports these triggering methods:

Simple Edge

Advanced Edge

Windowing

Pulse width

Logic

Delay

Drop-out

Runt