def setCTRatio(self, new_ct, password="00000000"):
        """ Serial call to set CT ratio for attached inductive pickup.

        Args:
            new_ct (int): A :class:`~ekmmeters.CTRatio` value, a legal amperage setting.
            password (str): Optional password.

        Returns:
            bool: True on completion with ACK.
        """
        ret = False
        self.setContext("setCTRatio")
        try:
            self.clearCmdMsg()
            if ((new_ct != CTRatio.Amps_100) and (new_ct != CTRatio.Amps_200) and
                    (new_ct != CTRatio.Amps_400) and (new_ct != CTRatio.Amps_600) and
                    (new_ct != CTRatio.Amps_800) and (new_ct != CTRatio.Amps_1000) and
                    (new_ct != CTRatio.Amps_1200) and (new_ct != CTRatio.Amps_1500) and
                    (new_ct != CTRatio.Amps_2000) and (new_ct != CTRatio.Amps_3000) and
                    (new_ct != CTRatio.Amps_4000) and (new_ct != CTRatio.Amps_5000)):
                self.writeCmdMsg("Legal CT Ratios: 100, 200, 400, 600, " +
                                 "800, 1000, 1200, 1500, 2000, 3000, 4000 and 5000")
                self.setContext("")
                return ret

            if len(password) != 8:
                self.writeCmdMsg("Invalid password length.")
                self.setContext("")
                return ret

            if not self.request(False):
                self.writeCmdMsg("Bad read CRC on setting")
            else:
                if not self.serialCmdPwdAuth(password):
                    self.writeCmdMsg("Password failure")
                else:
                    req_str = "015731023030443028" + binascii.hexlify(str(new_ct).zfill(4)) + "2903"
                    req_str += self.calc_crc16(req_str[2:].decode("hex"))
                    self.m_serial_port.write(req_str.decode("hex"))
                    if self.m_serial_port.getResponse(self.getContext()).encode("hex") == "06":
                        self.writeCmdMsg("Success(setCTRatio): 06 returned.")
                        ret = True
            self.serialPostEnd()

        except:
            ekm_log(traceback.format_exc(sys.exc_info()))

        self.setContext("")
        return ret
Serial call to set CT ratio for attached inductive pickup.

        Args:
            new_ct (int): A :class:`~ekmmeters.CTRatio` value, a legal amperage setting.
            password (str): Optional password.

        Returns:
            bool: True on completion with ACK.