Done! It will say "is <" instead of "is under".
That worked. Many thanks for that!
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
So I did some testing and rework. 21 passes of SPC. I removed all the extra output in the log and just concentrated on the failures.
Jan 05 04:35:41 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 04:35:52 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 04:36:22 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:41
Jan 05 04:36:43 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:21
Jan 05 04:37:55 - SHOWTIME: SPC step : Hfd117 offset 00:01:12
CAL: Gain error samples (5.119844 : 1.388271) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 05:24:28 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 05:24:39 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 05:25:09 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:41
Jan 05 05:25:29 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 05 05:26:40 - SHOWTIME: SPC step : Hfd117 offset 00:01:11
CAL: Gain error samples for hfd at 2mV : (0.899248 : -1.069323) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 05:49:55 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 05:50:26 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:42
Jan 05 05:50:47 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:21
Jan 05 05:51:59 - SHOWTIME: SPC step : Hfd117 offset 00:01:12
CAL: Gain error samples (5.119844 : 0.878797) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 05:58:33 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 05:58:44 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 05:59:13 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:40
Jan 05 05:59:33 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 05 06:00:45 - SHOWTIME: SPC step : Hfd117 offset 00:01:12
CAL: Gain error samples for hfd at 2mV : (0.903158 : -1.073383) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 06:16:34 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 06:16:47 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 06:17:20 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:46
Jan 05 06:17:44 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 05 06:19:07 - SHOWTIME: SPC step : Hfd117 offset 00:01:23
CAL: Gain error samples (5.119844 : 0.906090) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 06:25:44 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 06:25:57 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 06:26:31 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 05 06:26:54 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 05 06:28:15 - SHOWTIME: SPC step : Hfd117 offset 00:01:21
CAL: Gain error samples for hfd at 2mV : (1.496541 : -1.594211) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 06:35:40 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 06:35:53 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 06:36:28 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 05 06:36:51 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 05 06:38:16 - SHOWTIME: SPC step : Hfd117 offset 00:01:25
CAL: Gain error samples (5.119844 : 1.518271) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 06:47:33 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 06:47:45 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 06:48:21 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 05 06:48:44 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 05 06:50:05 - SHOWTIME: SPC step : Hfd117 offset 00:01:21
CAL: Gain error samples (5.119844 : 0.898196) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 07:01:18 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 07:01:30 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 07:02:05 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 05 07:02:28 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 05 07:03:52 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples (5.119844 : 1.305113) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 08:42:55 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 08:43:07 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 08:43:37 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:42
Jan 05 08:43:57 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 05 08:45:08 - SHOWTIME: SPC step : Hfd117 offset 00:01:11
CAL: Gain error samples (5.119844 : 1.417218) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 08:51:09 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 08:51:20 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 08:51:50 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:41
Jan 05 08:52:09 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:19
Jan 05 08:53:21 - SHOWTIME: SPC step : Hfd117 offset 00:01:12
CAL: Gain error samples (5.119844 : 0.752105) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 08:59:10 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 08:59:21 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 08:59:50 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:40
Jan 05 09:00:10 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 05 09:01:21 - SHOWTIME: SPC step : Hfd117 offset 00:01:11
CAL: Gain error samples for hfd at 2mV : (0.940827 : -1.103083) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 09:14:36 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 09:14:47 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 09:15:18 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:42
Jan 05 09:15:38 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 05 09:16:48 - SHOWTIME: SPC step : Hfd117 offset 00:01:10
CAL: Gain error samples for hfd at 2mV : (2.211353 : -2.640000) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 09:23:51 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 09:24:04 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 09:24:40 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:49
Jan 05 09:25:04 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 05 09:26:26 - SHOWTIME: SPC step : Hfd117 offset 00:01:22
CAL: Gain error samples for hfd at 2mV : (1.736241 : -1.793985) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 11:22:35 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 11:22:49 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 11:23:24 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:49
Jan 05 11:23:48 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 05 11:24:19 - findDacValue: failed to find good DAC value after 20 tries.
CAL: Offset error in hfd117 10mv Fine dac value on channel 2
CAL: SPC returned an error in step Hfd117 offset
CAL: SPC failed
Jan 05 12:44:37 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 12:44:51 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 12:45:25 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 05 12:45:49 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 05 12:47:14 - SHOWTIME: SPC step : Hfd117 offset 00:01:25
CAL: Gain error samples (5.119844 : 0.388571) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 12:55:10 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 12:55:23 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 12:55:58 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 05 12:56:23 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:25
Jan 05 12:57:47 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples (5.119844 : 1.613008) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 13:09:16 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 13:09:29 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 13:10:04 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 05 13:10:28 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 05 13:11:53 - SHOWTIME: SPC step : Hfd117 offset 00:01:25
CAL: Gain error samples (4.231654 : -5.113316) OOR for hfd at 2mV on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 14:05:38 - SHOWTIME: SPC step : M859 offset 00:01:56
CAL: Gain error samples (5.119844 : -2.490827) OOR on ch 2
CAL: Gain error samples for M859 1mV channel 2 failed.
CAL: SPC returned an error in step M859 stepgain
CAL: SPC failed
Jan 05 14:25:46 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 14:26:00 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 14:26:36 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:50
Jan 05 14:27:00 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 05 14:28:24 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples for hfd at 2mV : (1.631880 : -2.031955) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 05 14:45:26 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 05 14:45:40 - findVibnullDac: failed to find good DAC value for HIGH
Jan 05 14:46:16 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:50
Jan 05 14:46:41 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:25
Jan 05 14:48:07 - SHOWTIME: SPC step : Hfd117 offset 00:01:26
CAL: Gain error samples (5.119844 : 2.060000) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
13 failures on CH2, 8 failures on CH1. Ugh, why couldn't it just be one channel?
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif)
Since there were more failures on Ch2, I replaced that attenuator.
21 more passes:
Jan 06 05:55:54 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 05:56:06 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 05:56:35 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:41
Jan 06 05:56:55 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 06 05:58:07 - SHOWTIME: SPC step : Hfd117 offset 00:01:12
CAL: Gain error samples for hfd at 2mV : (0.999774 : -1.135940) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 06:06:07 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 06:06:19 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 06:06:48 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:41
Jan 06 06:07:07 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:19
Jan 06 06:08:21 - SHOWTIME: SPC step : Hfd117 offset 00:01:14
CAL: Gain error samples (5.119844 : 0.887444) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 06:21:24 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 06:21:37 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 06:22:10 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:46
Jan 06 06:22:34 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 06:23:59 - SHOWTIME: SPC step : Hfd117 offset 00:01:25
CAL: Gain error samples for hfd at 2mV : (2.519098 : -2.956617) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 06:39:46 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 06:39:59 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 06:40:34 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 06 06:40:58 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 06:42:20 - SHOWTIME: SPC step : Hfd117 offset 00:01:22
CAL: Gain error samples (5.119844 : 1.608496) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 06:49:54 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 06:50:07 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 06:50:42 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 06 06:51:05 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 06 06:52:29 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples for hfd at 2mV : (2.338421 : -2.741128) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 07:03:03 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 07:03:16 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 07:03:50 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 06 07:04:14 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 07:05:38 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples (5.119844 : 1.264962) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 07:12:35 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 07:12:47 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 07:13:22 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 06 07:13:45 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 06 07:15:09 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples for hfd at 2mV : (0.974060 : -1.127368) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 07:24:15 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 07:24:28 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 07:25:02 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 06 07:25:26 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 07:26:49 - SHOWTIME: SPC step : Hfd117 offset 00:01:23
CAL: Gain error samples for hfd at 2mV : (1.639549 : -2.052256) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 07:33:50 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 07:34:03 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 07:34:39 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:49
Jan 06 07:35:02 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 06 07:36:25 - SHOWTIME: SPC step : Hfd117 offset 00:01:23
CAL: Gain error samples for hfd at 2mV : (1.395038 : -1.494511) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 07:43:41 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 07:43:54 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 07:44:28 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 06 07:44:51 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 06 07:46:16 - SHOWTIME: SPC step : Hfd117 offset 00:01:25
CAL: Gain error samples for hfd at 2mV : (2.530075 : -2.965564) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 07:59:08 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 07:59:22 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 07:59:56 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 06 08:00:20 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 08:00:57 - findDacValue: failed to find good DAC value after 20 tries.
CAL: Offset error in hfd117 10mv Fine dac value on channel 4
CAL: SPC returned an error in step Hfd117 offset
CAL: SPC failed
Jan 06 08:08:23 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 08:08:37 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 08:09:11 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 06 08:09:34 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 06 08:10:57 - SHOWTIME: SPC step : Hfd117 offset 00:01:23
CAL: Gain error samples for hfd at 2mV : (2.632707 : -3.078947) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 08:22:42 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 08:22:55 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 08:23:31 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:49
Jan 06 08:23:54 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:23
Jan 06 08:25:20 - SHOWTIME: SPC step : Hfd117 offset 00:01:26
CAL: Gain error samples for hfd at 2mV : (0.911128 : -1.067444) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 08:37:11 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 08:37:25 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 08:38:01 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:50
Jan 06 08:38:25 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 08:39:47 - SHOWTIME: SPC step : Hfd117 offset 00:01:22
CAL: Gain error samples for hfd at 2mV : (2.092406 : -2.495940) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 08:56:57 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 08:57:10 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 08:57:44 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 06 08:58:08 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 08:59:32 - SHOWTIME: SPC step : Hfd117 offset 00:01:24
CAL: Gain error samples for hfd at 2mV : (1.431504 : -1.530602) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 09:27:58 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 09:28:12 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 09:28:47 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:49
Jan 06 09:29:11 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 09:30:33 - SHOWTIME: SPC step : Hfd117 offset 00:01:22
CAL: Gain error samples (5.119844 : 1.120902) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 09:49:07 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 09:49:20 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 09:49:54 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:47
Jan 06 09:50:19 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:25
Jan 06 09:51:42 - SHOWTIME: SPC step : Hfd117 offset 00:01:23
CAL: Gain error samples (4.223684 : -5.113691) OOR for hfd at 2mV on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 09:59:29 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 09:59:40 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 10:00:09 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:40
Jan 06 10:00:30 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:21
Jan 06 10:01:39 - SHOWTIME: SPC step : Hfd117 offset 00:01:09
CAL: Gain error samples for hfd at 2mV : (1.846090 : -2.258120) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 10:17:13 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 10:17:24 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 10:17:54 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:41
Jan 06 10:18:14 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:20
Jan 06 10:18:46 - findDacValue: failed to find good DAC value after 20 tries.
CAL: Offset error in hfd117 10mv Fine dac value on channel 4
CAL: SPC returned an error in step Hfd117 offset
CAL: SPC failed
Jan 06 10:58:36 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 10:58:50 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 10:59:25 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:49
Jan 06 10:59:49 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 11:01:14 - SHOWTIME: SPC step : Hfd117 offset 00:01:25
CAL: Gain error samples for hfd at 2mV : (2.055789 : -2.482556) is < 6 on ch 1
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
Jan 06 11:13:45 - SHOWTIME: SPC step : Get Temperature 00:00:00
Jan 06 11:13:58 - findVibnullDac: failed to find good DAC value for HIGH
Jan 06 11:14:33 - SHOWTIME: SPC step : Hfd117 Null input current 00:00:48
Jan 06 11:14:57 - SHOWTIME: SPC step : Hfd117 varigain DAC 00:00:24
Jan 06 11:16:20 - SHOWTIME: SPC step : Hfd117 offset 00:01:23
CAL: Gain error samples (5.119844 : 1.144511) OOR for hfd at 2mV on ch 2
CAL: SPC returned an error in step Hfd117 stepgain
CAL: SPC failed
21 passes, 5 failures on CH2, 14 failures on CH1, 2 failures on CH4. Ch4 now too, eh?
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif)
Not very conclusive, but the bulk of the failures shifted to CH1.
I'm beginning to think that one of the DACs may be at fault. The one thing that sticks out are the
findVibnullDac: failed to find good DAC value for HIGH
Which pretty much happens on every SPC run. They are 74 ball AD5516 16 channel DAC BGA devices, which I don't have the capability to replace.
The non-B suffix TDS5104 used IMP I10412-01 gull-wing DACs (Tek referred to them as daculators) which were also used in the TDS700 series scopes.
That would have been easy...
I'm debating about whether to replace the attenuator on CH1 now. I don't think it will fix the scope, but it might be interesting to see how the failures distribute themselves on a 3rd run. If it were an easy replacement, I'd do it. But these things are a
bitch to remove without breaking them. The ground and power planes are tough to clear. Also, on the component side of the board, the pins flare out and get soldered on the top of the pad itself. I had to use a small probe to break the pins free of the solder after clearing the hole with my Pace.
F*ck me...
I'll think about doing CH1 for a day or two.
Some pics: