SLAC Magnetic Measurements Date: 03-12-2004 Time: 08:59:54 Project: Orion Magnet Type: solenoid Magnet Name: Ecomp Serial Number: Run Number: 36 Measurement Device: Coil ZZ Operator: keh Comment: harmonics Standardization: 4 cycles from 0.0 A to 220.0 A to 0.0 A Test Currents (A): 100.0 150.0 200.0 09:00:13 Vcoil, device being used, type = SR850 09:00:25 Stage Zeroed 09:00:25 MoveZ Devices: Move Device = SXDRIVE, Read Device = SXDRIVE 09:00:27 Initial Zero Current Measurement, Imag_zero = 0.0000 A 09:00:27 Magnet current ramping to 220.0000 A... 09:03:02 Magnet current ramping to 0.0000 A... 09:05:38 Magnet current ramping to 220.0000 A... 09:08:14 Magnet current ramping to 0.0000 A... 09:10:50 Magnet current ramping to 220.0000 A... 09:13:27 Magnet current ramping to 0.0000 A... 09:16:03 Magnet current ramping to 220.0000 A... 09:18:39 Magnet current ramping to 0.0000 A... 09:21:15 Magnet current ramping to 100.0000 A... 09:23:39 Move Stage, position = -0.250000 09:23:40 Stage Position Measurement, pos = -0.250000 m 09:23:42 Magnet Current, Imag = 100.0987 A Vtrans = 1.000987 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 09:23:44 Coil Rotation Frequency Measurement freq = 23.836100 Hz 09:26:27 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000378 -100.008 2 0.0000000 -90.000 3 0.0000000 -90.000 09:26:37 Move Stage, position = -0.225000 09:26:39 Stage Position Measurement, pos = -0.225000 m 09:26:40 Magnet Current, Imag = 100.0963 A Vtrans = 1.000963 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 09:26:42 Coil Rotation Frequency Measurement freq = 23.827600 Hz 09:29:16 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000620 -83.658 2 0.0000135 -90.000 3 0.0000000 -90.000 09:29:26 Move Stage, position = -0.200000 09:29:28 Stage Position Measurement, pos = -0.200000 m 09:29:29 Magnet Current, Imag = 100.0914 A Vtrans = 1.000914 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 09:29:31 Coil Rotation Frequency Measurement freq = 23.834200 Hz 09:32:03 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000539 -82.878 2 0.0000121 -100.494 3 0.0000000 -90.000 09:32:14 Move Stage, position = -0.175000 09:32:15 Stage Position Measurement, pos = -0.175000 m 09:32:16 Magnet Current, Imag = 100.0869 A Vtrans = 1.000869 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 09:32:19 Coil Rotation Frequency Measurement freq = 23.826600 Hz 13:28:24 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000378 -79.992 2 0.0000155 -112.992 3 0.0000003 -41.262 13:28:34 Move Stage, position = -0.150000 13:28:36 Stage Position Measurement, pos = -0.150000 m 13:28:37 Magnet Current, Imag = 99.9050 A Vtrans = 0.999050 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:28:39 Coil Rotation Frequency Measurement freq = 23.806600 Hz 13:30:39 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000306 -71.412 2 0.0000343 -161.970 3 0.0000020 -24.102 13:30:49 Move Stage, position = -0.125000 13:30:51 Stage Position Measurement, pos = -0.125000 m 13:30:52 Magnet Current, Imag = 99.9037 A Vtrans = 0.999037 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:30:54 Coil Rotation Frequency Measurement freq = 23.804700 Hz 13:32:37 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000377 -155.430 2 0.0001371 -162.264 3 0.0000073 -18.504 13:32:48 Move Stage, position = -0.100000 13:32:49 Stage Position Measurement, pos = -0.100000 m 13:32:50 Magnet Current, Imag = 99.9058 A Vtrans = 0.999058 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:32:53 Coil Rotation Frequency Measurement freq = 23.818000 Hz 13:34:29 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0001260 -117.228 2 0.0003671 -164.304 3 0.0000251 -7.374 13:34:39 Move Stage, position = -0.075000 13:34:41 Stage Position Measurement, pos = -0.075000 m 13:34:42 Magnet Current, Imag = 99.9081 A Vtrans = 0.999081 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:34:44 Coil Rotation Frequency Measurement freq = 23.811300 Hz 13:36:19 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0003169 -48.096 2 0.0002769 -169.704 3 0.0000364 -17.724 13:36:30 Move Stage, position = -0.050000 13:36:31 Stage Position Measurement, pos = -0.050000 m 13:36:32 Magnet Current, Imag = 99.9011 A Vtrans = 0.999011 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:36:35 Coil Rotation Frequency Measurement freq = 23.816100 Hz 13:38:12 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002013 -21.462 2 0.0001149 -172.338 3 0.0000262 -62.160 13:38:22 Move Stage, position = -0.025000 13:38:24 Stage Position Measurement, pos = -0.025000 m 13:38:25 Magnet Current, Imag = 99.8995 A Vtrans = 0.998995 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:38:27 Coil Rotation Frequency Measurement freq = 23.814200 Hz 13:40:08 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0001628 67.458 2 0.0000704 -160.308 3 0.0000215 -118.428 13:40:19 Move Stage, position = 0.000000 13:40:20 Stage Position Measurement, pos = 0.000000 m 13:40:22 Magnet Current, Imag = 99.9051 A Vtrans = 0.999051 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:40:24 Coil Rotation Frequency Measurement freq = 23.810400 Hz 13:42:06 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002303 70.542 2 0.0000508 -175.050 3 0.0000065 -58.842 13:42:16 Move Stage, position = 0.025000 13:42:18 Stage Position Measurement, pos = 0.025000 m 13:42:19 Magnet Current, Imag = 99.9015 A Vtrans = 0.999015 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:42:21 Coil Rotation Frequency Measurement freq = 23.816100 Hz 13:44:05 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002556 55.470 2 0.0000405 164.220 3 0.0000054 115.830 13:44:16 Move Stage, position = 0.050000 13:44:17 Stage Position Measurement, pos = 0.050000 m 13:44:19 Magnet Current, Imag = 99.8955 A Vtrans = 0.998955 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:44:21 Coil Rotation Frequency Measurement freq = 23.812300 Hz 13:46:04 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002369 44.298 2 0.0000131 143.016 3 0.0000072 -158.250 13:46:14 Move Stage, position = 0.075000 13:46:16 Stage Position Measurement, pos = 0.075000 m 13:46:17 Magnet Current, Imag = 99.8975 A Vtrans = 0.998975 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:46:20 Coil Rotation Frequency Measurement freq = 23.810400 Hz 13:47:59 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0001839 61.464 2 0.0001391 18.228 3 0.0000148 -94.188 13:48:09 Move Stage, position = 0.100000 13:48:11 Stage Position Measurement, pos = 0.100000 m 13:48:12 Magnet Current, Imag = 99.8932 A Vtrans = 0.998932 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:48:14 Coil Rotation Frequency Measurement freq = 23.816100 Hz 13:49:52 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0001793 177.816 2 0.0003333 15.906 3 0.0000178 -176.118 13:50:02 Move Stage, position = 0.125000 13:50:04 Stage Position Measurement, pos = 0.125000 m 13:50:05 Magnet Current, Imag = 99.8980 A Vtrans = 0.998980 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:50:08 Coil Rotation Frequency Measurement freq = 23.810400 Hz 13:51:48 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0001650 -141.228 2 0.0001636 15.636 3 0.0000069 164.076 13:51:59 Move Stage, position = 0.150000 13:52:00 Stage Position Measurement, pos = 0.150000 m 13:52:01 Magnet Current, Imag = 99.8866 A Vtrans = 0.998866 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:52:04 Coil Rotation Frequency Measurement freq = 23.811300 Hz 13:53:50 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000637 -111.204 2 0.0000401 10.686 3 0.0000018 156.570 13:54:00 Move Stage, position = 0.175000 13:54:02 Stage Position Measurement, pos = 0.175000 m 13:54:03 Magnet Current, Imag = 99.8944 A Vtrans = 0.998944 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:54:05 Coil Rotation Frequency Measurement freq = 23.817100 Hz 13:55:55 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000508 -86.532 2 0.0000136 13.872 3 0.0000012 148.080 13:56:06 Move Stage, position = 0.200000 13:56:07 Stage Position Measurement, pos = 0.200000 m 13:56:09 Magnet Current, Imag = 99.8906 A Vtrans = 0.998906 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:56:11 Coil Rotation Frequency Measurement freq = 23.815200 Hz 13:58:01 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000584 -82.224 2 0.0000082 15.546 3 0.0000009 145.614 13:58:12 Move Stage, position = 0.225000 13:58:13 Stage Position Measurement, pos = 0.225000 m 13:58:14 Magnet Current, Imag = 99.8910 A Vtrans = 0.998910 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 13:58:17 Coil Rotation Frequency Measurement freq = 23.810400 Hz 14:00:09 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000693 -82.638 2 0.0000061 11.346 3 0.0000011 125.628 14:00:19 Move Stage, position = 0.250000 14:00:21 Stage Position Measurement, pos = 0.250000 m 14:00:22 Magnet Current, Imag = 99.8891 A Vtrans = 0.998891 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:00:24 Coil Rotation Frequency Measurement freq = 23.812300 Hz 14:02:15 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000788 -84.186 2 0.0000046 0.372 3 0.0000006 134.826 14:03:10 Move Stage, position = 0.000000 14:03:10 Magnet current ramping to 150.0000 A... 14:05:04 Move Stage, position = -0.250000 14:05:06 Stage Position Measurement, pos = -0.250000 m 14:05:07 Magnet Current, Imag = 149.8889 A Vtrans = 1.498889 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:05:09 Coil Rotation Frequency Measurement freq = 23.813200 Hz 14:07:00 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000797 -84.492 2 0.0000050 -178.728 3 0.0000002 1.248 14:07:10 Move Stage, position = -0.225000 14:07:12 Stage Position Measurement, pos = -0.225000 m 14:07:13 Magnet Current, Imag = 149.8875 A Vtrans = 1.498875 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:07:15 Coil Rotation Frequency Measurement freq = 23.809400 Hz 14:09:17 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000710 -82.158 2 0.0000064 -175.056 3 0.0000005 -90.000 14:09:28 Move Stage, position = -0.200000 14:09:29 Stage Position Measurement, pos = -0.200000 m 14:09:31 Magnet Current, Imag = 149.8821 A Vtrans = 1.498821 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:09:33 Coil Rotation Frequency Measurement freq = 23.805600 Hz 14:11:23 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000611 -78.174 2 0.0000085 -168.678 3 0.0000004 -58.800 14:11:33 Move Stage, position = -0.175000 14:11:35 Stage Position Measurement, pos = -0.175000 m 14:11:36 Magnet Current, Imag = 149.8830 A Vtrans = 1.498830 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:11:38 Coil Rotation Frequency Measurement freq = 23.808500 Hz 14:13:29 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000489 -70.644 2 0.0000164 -164.454 3 0.0000007 -8.754 14:13:40 Move Stage, position = -0.150000 14:13:41 Stage Position Measurement, pos = -0.150000 m 14:13:42 Magnet Current, Imag = 149.8753 A Vtrans = 1.498753 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:13:45 Coil Rotation Frequency Measurement freq = 23.812300 Hz 14:15:32 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000200 -63.186 2 0.0000496 -161.904 3 0.0000026 -11.778 14:15:42 Move Stage, position = -0.125000 14:15:44 Stage Position Measurement, pos = -0.125000 m 14:15:45 Magnet Current, Imag = 149.8825 A Vtrans = 1.498825 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:15:47 Coil Rotation Frequency Measurement freq = 23.808500 Hz 14:17:28 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0001080 159.180 2 0.0002054 -161.958 3 0.0000131 -14.940 14:17:39 Move Stage, position = -0.100000 14:17:40 Stage Position Measurement, pos = -0.100000 m 14:17:41 Magnet Current, Imag = 149.8781 A Vtrans = 1.498781 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:17:44 Coil Rotation Frequency Measurement freq = 23.802800 Hz 14:19:18 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002203 -176.058 2 0.0005472 -163.650 3 0.0000394 -7.320 14:19:29 Move Stage, position = -0.075000 14:19:30 Stage Position Measurement, pos = -0.075000 m 14:19:31 Magnet Current, Imag = 149.8747 A Vtrans = 1.498747 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:19:34 Coil Rotation Frequency Measurement freq = 23.809400 Hz 14:21:18 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0003021 -42.510 2 0.0004104 -168.792 3 0.0000602 -15.078 14:21:28 Move Stage, position = -0.050000 14:21:30 Stage Position Measurement, pos = -0.050000 m 14:21:31 Magnet Current, Imag = 149.8772 A Vtrans = 1.498772 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:21:33 Coil Rotation Frequency Measurement freq = 23.809400 Hz 14:23:10 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002652 -6.132 2 0.0001714 -170.892 3 0.0000409 -58.326 14:23:20 Move Stage, position = -0.025000 14:23:21 Stage Position Measurement, pos = -0.025000 m 14:23:23 Magnet Current, Imag = 149.8770 A Vtrans = 1.498770 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:23:25 Coil Rotation Frequency Measurement freq = 23.814200 Hz 14:25:07 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002104 66.612 2 0.0001032 -157.272 3 0.0000285 -109.506 14:25:17 Move Stage, position = 0.000000 14:25:19 Stage Position Measurement, pos = 0.000000 m 14:25:20 Magnet Current, Imag = 149.8783 A Vtrans = 1.498783 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:25:22 Coil Rotation Frequency Measurement freq = 23.809400 Hz 14:27:01 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0003333 69.858 2 0.0000815 -170.490 3 0.0000122 -40.992 14:27:12 Move Stage, position = 0.025000 14:27:13 Stage Position Measurement, pos = 0.025000 m 14:27:14 Magnet Current, Imag = 149.8782 A Vtrans = 1.498782 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:27:17 Coil Rotation Frequency Measurement freq = 23.817100 Hz 14:28:57 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0004573 58.524 2 0.0000649 172.398 3 0.0000038 85.770 14:29:07 Move Stage, position = 0.050000 14:29:09 Stage Position Measurement, pos = 0.050000 m 14:29:10 Magnet Current, Imag = 149.8760 A Vtrans = 1.498760 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:29:12 Coil Rotation Frequency Measurement freq = 23.813200 Hz 14:30:55 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0004059 39.312 2 0.0000261 153.978 3 0.0000088 -149.574 14:31:05 Move Stage, position = 0.075000 14:31:07 Stage Position Measurement, pos = 0.075000 m 14:31:08 Magnet Current, Imag = 149.8774 A Vtrans = 1.498774 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:31:10 Coil Rotation Frequency Measurement freq = 23.812300 Hz 14:32:48 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002327 39.300 2 0.0002021 19.362 3 0.0000178 -100.776 14:32:58 Move Stage, position = 0.100000 14:33:00 Stage Position Measurement, pos = 0.100000 m 14:33:01 Magnet Current, Imag = 149.8740 A Vtrans = 1.498740 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:33:03 Coil Rotation Frequency Measurement freq = 23.813200 Hz 14:34:38 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002253 -164.328 2 0.0005008 17.136 3 0.0000304 179.838 14:34:48 Move Stage, position = 0.125000 14:34:50 Stage Position Measurement, pos = 0.125000 m 14:34:51 Magnet Current, Imag = 149.8703 A Vtrans = 1.498703 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:34:53 Coil Rotation Frequency Measurement freq = 23.811300 Hz 14:36:29 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0002505 -136.860 2 0.0002491 16.440 3 0.0000119 164.406 14:36:40 Move Stage, position = 0.150000 14:36:41 Stage Position Measurement, pos = 0.150000 m 14:36:43 Magnet Current, Imag = 149.8730 A Vtrans = 1.498730 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:36:45 Coil Rotation Frequency Measurement freq = 23.813200 Hz 14:38:30 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000866 -111.864 2 0.0000614 12.480 3 0.0000034 157.512 14:38:40 Move Stage, position = 0.175000 14:38:42 Stage Position Measurement, pos = 0.175000 m 14:38:43 Magnet Current, Imag = 149.8699 A Vtrans = 1.498699 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:38:45 Coil Rotation Frequency Measurement freq = 23.810400 Hz 14:40:45 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000579 -86.220 2 0.0000213 15.498 3 0.0000014 152.700 14:40:55 Move Stage, position = 0.200000 14:40:56 Stage Position Measurement, pos = 0.200000 m 14:40:58 Magnet Current, Imag = 149.8749 A Vtrans = 1.498749 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:41:00 Coil Rotation Frequency Measurement freq = 23.818000 Hz 14:42:50 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000626 -83.424 2 0.0000123 17.058 3 0.0000012 146.856 14:43:01 Move Stage, position = 0.225000 14:43:02 Stage Position Measurement, pos = 0.225000 m 14:43:03 Magnet Current, Imag = 149.8747 A Vtrans = 1.498747 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:43:06 Coil Rotation Frequency Measurement freq = 23.813200 Hz 14:44:56 Coil Voltage Measurement n v_amp v_ph (V0p) (deg) --- ---------- ---------- 1 0.0000719 -84.894 2 0.0000099 13.386 3 0.0000011 139.692 14:45:06 Move Stage, position = 0.250000 14:45:08 Stage Position Measurement, pos = 0.250000 m 14:45:09 Magnet Current, Imag = 149.8658 A Vtrans = 1.498658 V, Factor V/A = 0.010000 V/A, Zero Current = 0.000000 A 14:45:11 Coil Rotation Frequency Measurement freq = 23.810400 Hz