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Author Topic: IET Train First Class Carriages  (Read 2512 times)
1st fan
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« Reply #30 on: November 08, 2018, 02:41:53 pm »

The IEP specification didn't call up any standards, in fact it didn't say whether the train should provide mains or USB outlets. I assume we are only talking about mains and you own charger here; some posts certainly are, but are USB sockets even provided? 

USB itself was designed for data and control, and repurposed for recharging phones etc., both as an interface on the phone and a charger itself and its outlet. That has now been standardised, though using the principle that if one standard is good then a lot of them must be better. But I'm sure in reality they are pretty similar - EN IEC 62684:2018 seems to be current. But (without its full text) I  think it only covers volts and amps, not interference which is probably regarded as unimportant for charging. Working while plugged in is another issue altogether.

I suspect, like broadgage, it's about earthing. If the mains supply (live and neutral together) has a significant voltage at the train's inverter frequencies, which I understand are around 1 kHz, or their harmonics, that could well interfere with a touch screen. I don't know which principles they use these days; some types do use such voltages in the touch sensing itself, but even those that don't may have them just inside and not provide much screening.

In addressing the issue, the first problem is that you are GWR's customer, but GWR and DfT together are Hitachi's customer, so you have no direct contract with the design authority. Then, do they offer the service you are using, or only a charging facility? If there is no standard, or it's not a formal requirement, then what does someone (we don't know who) test the sockets against?

There ought to be solutions that can filter out the suggested kind of common-mode interference, but they all require filters that are properly earthed. A charger could use the mains earth for this, but I don't think they ever do. You can get filters to put in the USB lead, but they aren't yet (AFAICS) standard consumer items, and in any case are unlikely to address common mode interference or such low frequencies. But has anyone else come across workable solutions, using filters or otherwise?


I've certainly tried the USB socket on the IET but whether that was with a touchscreen enabled device I couldn't tell you. Depending on the type of train tomorrow night I'll be able to test it on both the inbuilt USB and the power socket. I'll also take along a few more different USB chargers as well as a USB power display device (https://www.amazon.com/AboveTEK%C2%AE-USB-Power-Meter-Current/dp/B00JIFMXSK/) to give it a full test. The sockets are in a daft place because you have to unplug everything if the person in the window seat has to get out of their seat.
« Last Edit: November 08, 2018, 03:16:26 pm by 1st fan » Logged
Clan Line
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« Reply #31 on: November 08, 2018, 03:20:03 pm »

I, and my wife, have both experienced difficulties using our smart 'phones on HSTs (in First Class) in the past. They seemed to respond very poorly/randomly to touch screen inputs. It made no difference whether the 'phone was plugged in or just running on its own battery. It may, possibly, have been related to our location within the coach.
I put it down to some interference produced by train fitted equipment - usually "cheapo" inverter type electronics is a common cause of unwanted interference.
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1st fan
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« Reply #32 on: November 08, 2018, 10:24:21 pm »

I, and my wife, have both experienced difficulties using our smart 'phones on HSTs (in First Class) in the past. They seemed to respond very poorly/randomly to touch screen inputs. It made no difference whether the 'phone was plugged in or just running on its own battery. It may, possibly, have been related to our location within the coach.
I put it down to some interference produced by train fitted equipment - usually "cheapo" inverter type electronics is a common cause of unwanted interference.

That's very odd (the unplugged bit) and it would be interesting to see if you get the same interference on the IET with the same items.
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« Reply #33 on: November 09, 2018, 08:24:44 am »

I, and my wife, have both experienced difficulties using our smart 'phones on HSTs (in First Class) in the past. They seemed to respond very poorly/randomly to touch screen inputs. It made no difference whether the 'phone was plugged in or just running on its own battery. It may, possibly, have been related to our location within the coach.
I put it down to some interference produced by train fitted equipment - usually "cheapo" inverter type electronics is a common cause of unwanted interference.

That's very odd (the unplugged bit) and it would be interesting to see if you get the same interference on the IET with the same items.

I have my first IET First Class "experience" booked later in the month. Will set a reminder in my 'phone to tell me to check - if my 'phone will work to remind me, that is !
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« Reply #34 on: November 09, 2018, 07:29:32 pm »

Sadly for the purposes of the test* I'm on an HST tonight and everything is working perfectly whilst connected to the onboard power supply. Will have to try with my plethora of gadgets and different chargers on the return journey. *Although I'm personally much happier on the HST.
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1st fan
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« Reply #35 on: November 11, 2018, 06:01:34 pm »

So I'm sitting in a 9 car IEP and I have tested the power using a variety of different chargers and cables. I'll upload a picture of the chargers and indicate which ones worked and which didn't. The Amazon tablet is the main sufferer of gobbledygook. The Samsung phone was unaffected as far as I can tell. The iPhone would occasionally type a letter from the other side of the keyboard but it was really random and not conclusive evidence. The cable for the iPhone is also shielded which might make a difference.
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