def METHOD_NAME(self):
    self.core.break_realtime()
    self.dev.init()
    # clear backing state
    self.dev.att_reg = 0
    att_set = [int32(0x21), int32(0x43),
               int32(0x65), int32(0x87)]
    # set individual attenuators
    for i in range(len(att_set)):
        self.dev.set_att_mu(i, att_set[i])
    # confirm that we can set all attenuators and read back
    att_get = [0 for _ in range(len(att_set))]
    for i in range(len(att_set)):
        self.core.break_realtime()
        att_get[i] = self.dev.get_channel_att_mu(i)
    # confirm backing state
    att_reg = self.dev.att_reg
    self.set_dataset("att_set", att_set)
    self.set_dataset("att_get", att_get)
    self.set_dataset("att_reg", att_reg)