Will the Hantek 1008C show 4 spark traces at once?
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- Andy.MacFadyen
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You can do it by simply clipping the supplied DIS HT probe to the HT lead from the coil to the distributer but that won't synch to the firing order. To get the capture synched to the firing order without buying another DIS probe you would need to connect the DIS probe to #1 cylinder and set that as a trigger and another channel to the ignition primary through a 20:1 attenuator.
With the Hantek 1008 the processing power is shared between channels so the more channels you use the less detail you get, I haven't got a capture of a spark parade from a DIS system using the Hantek 1008 but I posted one in another forum for a Rover K 1.8 shared plug top coil system showing ignition pimary current ramp and the secondary voltage and it shows the Hantek's limitations. For your B you would only need half the length of screen of that capture to show one complete 4 cylinder capture ie 2 revolutions of the crankshaft so you would get more detail.
As an former MG owner (ZB, TF1250 and chrome bumper B ) I have spent many hours fiddling with twin sU carbs and worn out Lucas distributers. I would be really interested in in any capures you get.
The sparks on this caputure are reversed polarity so the spark looks odd because it is inverted.
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I'm wanting to see how accurate the spacing is between firings. I run an Accuspark points replacement module and a CB Performance Blackbox ignition computer. It replaces the mechanical and vac advance. I machined the distributor shaft smooth so there is no imbalance from the counterweight base anymore.
There has been some concern about points modules giving inaccurate spark spacing and I'd like to check it for myself. I think I can make a new magnet ring on my laser cutter if the thing is off.
For detail I'm wondering if I could just view a single spark trace at a time. I'm not in a hurry.
As it takes about a month to get one of these Hanteks out of China, I'll order an attenuator and an extra HT lead just in case.
Thanks again,
Adrian
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- Andy.MacFadyen
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If you have converted to the solid distibuter shaft it should get rid of most of any timing variation. You should be easily able to measure the spacing between spark events and dwell time with the on screen rulers. Connecting to the ignition primary is a really useful way of checking the ignition dwell time.
If you use the DIS probe on an individual cylinder the slope of the firing line is useful indicator of air/fuel ratio, this could give you a way of checking the fuel distribution between cylinders sharing a siamesed inlet port.
You might also want to consider getting a current clamp as this can give you a very quick and easy way of checking not only the coil but just about every other electrical item on any car.
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Adrian
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- Andy.MacFadyen
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Setting the trigger voltage is just a matter of dragging the trigger indicator at the edge of the display up or down untill you get a steady waveform displayed after that just alter the Time Base and voltage untill you get a nice parade of secondaryHT voltages.
The voltage waveform for No1 cylinder will look slightly different between Channel 1 and Channel 2 --- that is beause you have a distributer ignition and the spark has to jump from the rotor arm to the segment on the cap.
As your first interest is spotting any variations in ignition timing between cylinders you want to use the vertical (X axis Time) cursors to measure the time difference between each spark.
With the Hantek 1008 it is best to start with one of their pre-set setups from the "Auto" (ie Automotive) test menu other wise you will spend half an hour just turning 6 of the 8 channels off, I don't have the Hantek software loaded on this Netbook otherwise I could talk you through it better.
It is best to ignore and turn off the Hantek example waveforms/
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- Andy.MacFadyen
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On most oscilloscope scopes you can flip the display over to make inverted patterns easier to under stand -- but not the Hantek 1008
With a ignition parade pattern you look for a cylinder that dosen't fit in with the rest ---- look at the forrest not the trees, in this case one of the cylinders has lower voltage than the other three. This sugest a spark leaking to ground or a bad or fouled plug or the the spark plug gap closed up or low compression there isn't enough detail in the capture to make an informed guess as to which.
What you need to do now is look at the cylinder on it own ---- first capture a good cylinder in closer detail then capture the suspect cylinder with the same the settings.
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This picture is the classic "good" spark at normal idle
This is explains some of the features
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- Andy.MacFadyen
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Inverted polarity sparks can be difficut to get your head round but after a while it becomes easier.
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" We're trying to plug a hole in the universe, what are you doing ?. "
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I'm having trouble with the Hantek software and my window 8 laptop. The software hangs, skips , jumps and generally acts weird. I'm going to have to sort that out before I can get anything useful I fear. I'll try a spare XP desktop or I also have a spare windows 7 machine. Any advice from your experience with this software would gratefully welcomed.
There seems to be no way to measure anything. I think maybe my laptop is too wimpy to run this device?
The engine is currently idling at 12:1 f/a ratio and I'm running 25 thou plug gaps. I did notice the large amount of ringing. Wondered if it could be related to the rich mixture burning easily?
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I triple checked the wiring and I have it wired as instructed. The CB Blackbox must be flipping the display. The coil is wired per standard MG practice.
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- Andy.MacFadyen
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The way to measure Time periods and Voltage differences is to use the cursors This shows how to measure the dwell time, most oscilloscope cursors work in a similar way so if you learn it o the Hantek it will be the same if you ever decide to upgrade.
You could probably open the the plugs gaps out especially if you are using Platinum or Iridium plugs --- try 0.035" this should put more of the coils energy into the spark without causing issues.
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Not sure what to do now. I'll contact Hantek and see what they say.
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" We're trying to plug a hole in the universe, what are you doing ?. "
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Any recommendation on a cost effective scope from another outfit would be appreciated.
And thanks for all your help.
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