Yeah I’ve had that on more than one occasion, I write all my times down from the tacho head display then double check them when I remove the disc, I’ve had the odd one that have been around fifteen minutes out but there are quite a few that are around five minutes out !!
Coffeeholic:
Mrknowitall:
Its those pair shaped tacho charts that are defectiveIf you stack about 6 of them and check them they have been known to be upto 30 minutes out in some cases
it is common knowledge amongst drivers but vosa and your boss will allways deny it
Doesn’t matter if the marking on different charts don’t match up, you tend to take all your break on one chart.
Haha, good answer. You have been answering these questions for too long Coffee…
Always good value to read though!
W
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V Max 100km/h - 125km/h - 140km/h - 180km/h
These are lots of different approval numbers which have to match the head unit. They also have to match the speeds on the head unit. There were always 2 popular types of card, the Lucas Kienzle and the Veeder Root. Veeder Root had 3 locating holes and a locking ring, while the Kienzle type have a pear drop shape, the top of the centre of the pear drop must point to 12 Noon. It is the peardrops that became most popular.
I still trust approved cards more than what I am reading on here, you are saying there can be 6 minutes difference between two cards, if so that puts the whole tachograph legislation in Europe at risk. In fact the government should be taken to the courts in Strasbourg because anyone who has been prosecuted for not taking enough daily or weekly rest since 20th December 1985 has been wrongly prosecuted.
There are some very clever lawyers out there who would have made a laughing stock of the judicial system both in Europe and the UK and become very rich out of the process, if they haven’t, Myself and Mr Knowitall will be millionaires by Christmas.
I can just about remember how to find the centre of a circle with a pair of schoolboy dividers and a ruler, so I am nipping to the print shop for a geometry set and a box of Kienzle charts 
I rest my case
Mrknowitall:
I rest my case
What case?
I agree with darb.
Mrknowitall:
I agree with darb.
Darb:
Yeah I’ve had that on more than one occasion, I write all my times down from the tacho head display then double check them when I remove the disc, I’ve had the odd one that have been around fifteen minutes out but there are quite a few that are around five minutes out !!
And that is where your problem lies!
We are talking about analogue tachograph heads now, as in the thread title. The display on the head is a rough guide. VOSA will never read that display, nor will you be prosecuted on what that display shows. The only legal document is the approved wax chart and the calibration sticker.
If you drive 4 hours straight on a display, I will bet you a pencil sharpener that 4 hours is also showing on the chart. However if you stop for fuel, do a couple of trailer changes and a delivery, the display will be 15 or 30 minutes adrift.
The tacho head display is a rough guide That’s the first time I’ve heard that one, I thought that was what calibration was for 
So if you pull up at 12:00 remove your tacho and on that it shows 12:15 then get in another truck that the head shows 9:00 but starts marking the tacho at 8:45 will Mr VOSA ■■■■ you for a too short daily rest or say “don’t worry about it drive the display is a rough guide” or do we need to just extend our daily rests 45 minutes just in case ■■
Darb:
The tacho head display is a rough guideSo if you pull up at 12:00 remove your tacho and on that it shows 12:15 then get in another truck that the head shows 9:00 but starts marking the tacho at 8:45 will Mr VOSA ■■■■ you for a too short daily rest or say “don’t worry about it drive the display is a rough guide” or do we need to just extend our daily rests 45 minutes just in case ■■
The display on a Digital tachograph is correct, whatever is shown on the display will be shown on the driver card and subsequent printout.
The display fitted to an Analogue tachograph is a guide, it isn’t calibrated, it is normally just an addition to the dashboard and has no legal bearing. What is scratched onto the wax chart is what the authorities will go by.
Yeah I understand that but how do you know what time it’s going to start marking the tacho with no display that is accurate? How how legally can we be held responsible for something that we don’t know ■■
Darb:
Yeah I understand that but how do you know what time it’s going to start marking the tacho with no display that is accurate? How how legally can we be held responsible for something that we don’t know ■■
The 24h tacho clock must be set to the correct time of the country of registration, that is the drivers responsibility to check it is correct and in the right zone, AM or PM
Whatever the clock is set for is the time that will be recorded, to be 100% sure, stick a blank chart in, shut the lid and remove it. That will mark the chart with the exact time it is recording.
In practice, you look at the clock, and if you have been playing about with fuses etc, that the time zone is correct.
Many years ago drivers used to bend the stylii to pretend they were not driving fast, all it did was mark the chart below the baseline and they still got done
Wheel Nut:
Darb:
The tacho head display is a rough guideSo if you pull up at 12:00 remove your tacho and on that it shows 12:15 then get in another truck that the head shows 9:00 but starts marking the tacho at 8:45 will Mr VOSA ■■■■ you for a too short daily rest or say “don’t worry about it drive the display is a rough guide” or do we need to just extend our daily rests 45 minutes just in case ■■
The display on a Digital tachograph is correct, whatever is shown on the display will be shown on the driver card and subsequent printout.
The display fitted to an Analogue tachograph is a guide, it isn’t calibrated, it is normally just an addition to the dashboard and has no legal bearing. What is scratched onto the wax chart is what the authorities will go by.
i think wheel nut is winding everyone up You should all do what you know is right
Mrknowitall:
Wheel Nut:
Darb:
The tacho head display is a rough guideSo if you pull up at 12:00 remove your tacho and on that it shows 12:15 then get in another truck that the head shows 9:00 but starts marking the tacho at 8:45 will Mr VOSA ■■■■ you for a too short daily rest or say “don’t worry about it drive the display is a rough guide” or do we need to just extend our daily rests 45 minutes just in case ■■
The display on a Digital tachograph is correct, whatever is shown on the display will be shown on the driver card and subsequent printout.
The display fitted to an Analogue tachograph is a guide, it isn’t calibrated, it is normally just an addition to the dashboard and has no legal bearing. What is scratched onto the wax chart is what the authorities will go by.
i think wheel nut is winding everyone up
I reckon you do not know your arse from your elbow, or a digital head unit from an analogue one. You do it your way. I will do it mine. 
if it aint been answered CD type tachos
are known as “electronic”
Darb:
The tacho head display is a rough guideSo if you pull up at 12:00 remove your tacho and on that it shows 12:15 then get in another truck that the head shows 9:00 but starts marking the tacho at 8:45 will Mr VOSA ■■■■ you for a too short daily rest or say “don’t worry about it drive the display is a rough guide” or do we need to just extend our daily rests 45 minutes just in case ■■
Mr Vosa will ■■■■ you and deservedly so, because you haven’t checked the clock is correct.
You are both getting confused between the two types of unit.
The analogue clock must be adjusted to the correct time, the digital clock cannot be altered more than one minute per week. So if the clock is wrong on a digi unit, you defect it and don’t drive it until it is fixed.
Stopped by VOSA last year. Their man told me with a digi, to do at least a 17 and a 32 min break, because they don’t record full minutes. So I always do just that, right or wrong.
bigvern1:
Stopped by VOSA last year. Their man told me with a digi, to do at least a 17 and a 32 min break, because they don’t record full minutes. So I always do just that, right or wrong.
Obviously a VOSA bloke who doesn’t know what he’s talking about then, the digital tachograph will tell you exactly how much break you’ve had.
Don’t care if he knows sod all about anything. I do it and it works for me.
Wheelnut should be called mr knowitall Except he know ■■■■ all and lack experiance 
wax cards can be out by up to 5mins either way. Line a stack up on the head and then flick through them at the 12. If yesterdays was 5 fast and todays 5 slow, that’s an 8:50 overnight rest if you have a minimum 9. I used to add 15 mins on. I used to add 5 on to my breaks Just for peace of mind. What’s the harm? If you have a minimum you probably wont get an infringement, if you add a few mins you definitely wont. What’s the obsession with pulling your card as soon as you put it in every day. Drivers flying about all day, then sitting there on 44 mins, engine running, in gear, hand on the hand brake. Makes me laugh