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| Thread ID: 113335 | 2010-10-15 03:43:00 | A most unusual question! | Billy T (70) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1145015 | 2010-10-15 03:43:00 | I reckon this has got to be one of the more obscure questions asked on PF1, even on Chat, but...........Do we have any members here who are technically knowledgeable about NZR/Kiwi Rail diesel-electric locomotives? I need to find out the frequency of the power generated for the motors (assuming that they are AC and not DC) and some idea of the voltage & current generated. I have good reasons (work related) for wanting to know this and have spent a lot of time today searching the web for relevant data but it seems that most electric trains overseas use overhead pickup at high voltage and a third rail or grounded rail returns (like the Wellington trains I guess) which is not helpful to my needs, as I wish to assess the external electromagnetic fields of a stand-alone diesel-electric locomotive unit (not a railcar). Generation frequency is also important as one instrument logs 25-250Hz and the other 10-1000Hz and I need to choose the one which offers the best resolution from a moving source. Cheers Billy 8-{) :confused: |
Billy T (70) | ||
| 1145016 | 2010-10-15 04:17:00 | Yes :) | SoniKalien (792) | ||
| 1145017 | 2010-10-15 05:28:00 | yes, pcuserwinvista, ask him. Or at least he will point you in the right direction | plod (107) | ||
| 1145018 | 2010-10-15 05:32:00 | Try the online govt archives at archway (http://www.archway.archives.govt.nz/)? | kahawai chaser (3545) | ||
| 1145019 | 2010-10-15 05:51:00 | Best resolution? When I use to calibrate instruments what would be best could be either 5 % or 1% - and would depend what range of scale and also if it's linear throughout - without much "noise" at both the lower end or top end. Then their is repeatability and reproducibility... In other words, is their high confidence (often 95 %) that both your instruments may not be significantly different for a certain working range? |
kahawai chaser (3545) | ||
| 1145020 | 2010-10-15 07:13:00 | DC ... much easier to control ... go to the site and then click on the link to "electric motors" www.wordiq.com Google is your friend :D |
SP8's (9836) | ||
| 1145021 | 2010-10-15 07:31:00 | Best resolution? When I use to calibrate instruments what would be best could be either 5 % or 1% - and would depend what range of scale and also if it's linear throughout - without much "noise" at both the lower end or top end. Then their is repeatability and reproducibility... In other words, is their high confidence (often 95 %) that both your instruments may not be significantly different for a certain working range? The instruments are quite different, one Swedish and one American. They are triaxial digital recorders, noise is not a problem, calibration is not an issue. Suitability for purpose is the key in terms of bandwidth, and sampling rate is the main factor, i.e. how many I can capture before the source goes out of range and I wait for the next train!. If the motors are DC I'm stuffed with those instruments, and my DC field meter is single axis and non-logging so it will be a TechRentals jobbie if they have such a beast. I'm off to Google D-E technology! Cheers Billy 8-{) |
Billy T (70) | ||
| 1145022 | 2010-10-15 08:02:00 | OK - makes sense. Techrentals - still around - I remember them, I use to cross reference/validate their calibration reports for capturing temps/humidity readings. I think you can set time intervals for data capture then export to excel/csv. Sometimes we would use IRL for advanced/difficult recordings. But won't you need to do multiple readings (capture) for statistical relevance? meaning that you would need to record from at least a few trains/motors... |
kahawai chaser (3545) | ||
| 1145023 | 2010-10-15 08:04:00 | yes, pcuserwinvista, ask him. Or at least he will point you in the right direction Not that knowledgeable :eek: I'll do a bit of research, it'll be based on the DX class (the most powerful in NZ) as there's several classes, each of which are different. |
pcuser42 (130) | ||
| 1145024 | 2010-10-15 08:09:00 | I think Billy's asking about real trains pcuserwinvista ... not models :devil: | SP8's (9836) | ||
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