def METHOD_NAME(self):
    a = ma.RamZFluxArc(t_start='20180205_105633', t_stop='20180205_120210',
                       ch_idx_cos=2, ch_idx_sin=3)
    poly_coeffs = a.proc_data_dict['poly_coeffs']
    # test dac arc conversion
    # For this to work all other parts have to work
    amps = np.linspace(.1, 1, 21)
    freqs = a.amp_to_freq(amps)
    rec_amps = a.freq_to_amp(freqs, kind='interpolate')
    np.testing.assert_array_almost_equal(amps, rec_amps, decimal=2)
    rec_amps = a.freq_to_amp(freqs, kind='root')
    np.testing.assert_array_almost_equal(amps, rec_amps, decimal=2)
    rec_amps = a.freq_to_amp(freqs, kind='root_parabola')
    np.testing.assert_array_almost_equal(amps, rec_amps, decimal=2)
    np.testing.assert_array_almost_equal(amps, rec_amps, decimal=2)
    poly_coeffs = a.proc_data_dict['poly_coeffs']
    exp_poly_coeffs = np.array(
        [1.36263320e+09, -2.23862128e+08, 3.87339064e+07])
    print(poly_coeffs)
    np.testing.assert_array_almost_equal(poly_coeffs, exp_poly_coeffs,
                                         decimal=-7)