def METHOD_NAME(self):
    """
    Set the current for all modules to zero.
    Includes dacs that are not controlled by this instrument (this is
     intentional).
    """
    # First set all "parameters" to zero.
    # this ensures that the safe slow rampdown is used and that the
    # correct values are known to the instrument.
    for ch in self.channel_map:
        self.set(ch, 0)
    # "brute-set" all sources in known modules to zero, this is because
    # this is also a safety method that should ensure we are in an all
    # zero state.
    for s in self.current_sources.values():
        for dac in range(4):
            s.set_current(dac, 0.0)