| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wolfe |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Bill Byford |
| Engineering Operator Run Comment |
| Eng. Test, mp268, mp282a, mp248; Sl: Wukitch, PO Wolfe, EO: Byford/parki |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Oct 5 2000 11:18:50:780AM | 1001004001 | Steve Wolfe | Moved the engineering test shots #2574-2586 described in my notes to the cmod$saved_shots:[engineering] directory using @sys$manager:move_test engineering seems to have worked. |
| Physics Operator Comments | |||
| Oct 4 2000 02:37:08:590PM | 1001004001 | Steve Wolfe | Common mode test of bus instrumentation. All bus voltage leads shorted and raised to 2KV. No problem, DC Common mode rejection looks excellent. GF current traces have been moved to BUSLV:TR16_1, which was not set up properly on this shot, so traces are missing. |
| Oct 4 2000 02:39:03:077PM | 1001004001 | Steve Wolfe | Test shot 2574: switching voltage on/off at ~1Hz, 100V, as yesterday, to look at Pearson response. Resistor voltage had been moved from EF1L to EF1_U:bus_volt, and as a result the response had an extra minus sign. |
| Oct 4 2000 02:41:02:183PM | 1001004001 | Steve Wolfe | Test shot 2575: switching voltage on/off at ~1Hz, 100V, as yesterday, to look at Pearson response. Resistor voltage moved back to EF1L. Signals now look like yesterday's test shot 1001003011, +80V gives ~+0.4a on pearson |
| Oct 4 2000 03:01:16:043PM | 1001004001 | Steve Wolfe | Test shot #2576 Use the "ringer" to put a 500V short pulse on the oh2l ground resistor. The ringer is a 1.5uF cap, which is being discharged through the 150 Ohm resistor, which is shorter than we really want, but we'll see what happened. see 400V pulse on the resistor signal, 0.8a on pearson, correct polarity. No crosstalk or common mode anywhere. |
| Oct 4 2000 03:18:17:187PM | 1001004001 | Steve Wolfe | Test shot #2577 Go to 1000V on ringer See 800V on resistor, 4A on oh2l gf pearson. Also see a small 10V voltage blip on tf bus voltage at at least one of the pulse times, -.346. Correction: there is crosstalk from the third spike, at 3.777sec, on tf and ef2U bus voltage, at the several hundred volt level, when the oh2 resistor trace shows 500V. |
| Oct 4 2000 03:36:26:857PM | 1001004001 | Steve Wolfe | Test shot #2578 Get a bigger ringer, try 2000V. This pulse is shorter and we'll only get one, so it may miss. Didn't get it, try again #2579: Got it at 1.664, noise spikes everywhere! pearsom signal is -8A for a -600V on resistor signal; note that the rc in the dividers are ~1ms and this looked like a 200usec pulse on the scope, so we are probably loading it some, and we're only sampled at 3kHz so it may miss the peak. Nevertheless, the point is that the spike propagates to all the other traces. |
| Oct 4 2000 04:40:34:780PM | 1001004001 | Steve Wolfe | Next shot: #2581 Hook up the resistor to a new divider and A12 channel, putting the EF1L bus voltage signal back where it belongs. If this fixes the problem, it will be a miracle, but it's worth a try. The oh2l ground resistor voltage is now on bushv:a12_2:input_6. Appropriate gain is 1000V/V OK got it at .968 and no crosstalk, but the pulse shape is much wider than the before. The crosstalk Gary noted on 2579 was also wide. I think this iso-amp has a filter in it. It also has a 150V dc offset. |
| Oct 4 2000 04:56:41:280PM | 1001004001 | Steve Wolfe | Next shot: #2582 Wrong channel had been de-filtered. This time we are re-doing the slow chop test Got the pearson signal, no voltage trace. |
| Oct 4 2000 05:45:23:937PM | 1001004001 | Steve Wolfe | Next shot: #2583 connector problem. This time, digitize a wavegen signal to verify it's connected ok, see a saturated slow square wave. |
| Oct 4 2000 05:51:34:170PM | 1001004001 | Steve Wolfe | Next shot: #2584 Now the 80V off/on test. See signals ok, but noisy and polarity is backward. |
| Oct 4 2000 05:55:00:873PM | 1001004001 | Steve Wolfe | Next shot: #2585 Repeat the 80V off/on test with leads reversed ok, looks reasonable. next shot: back to the hi-voltage ringer |
| Oct 4 2000 06:03:31:340PM | 1001004001 | Steve Wolfe | #2586 back to the hi-voltage ringer got it, at ..1896, no cross talk on other signals. GF current reads only 2Amps, but has the correct polarity,relative to the voltage. It works! |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 12:59:20:107PM | Test | Ok | 2KV on bus voltage taps |