Hello Mike and to all, thanks for your posts
Regarding the concern with your clamp, how is this going?
With regards to reverse flow of current into the battery rather than away, ( parasitic current) I have only seen this when either the clamp is installed incorrectly or dual vehicle batteries are installed and the batteries are equalising in charge level after engine off.
Can I ask Mike if the clamp has a good battery installed?
On another note for accurate low current measurements with accurate resolution it may be necessary to switch on your clamp and zero as normal, apply the clamp to measure the parasitic drain but zero again around 15 minutes into your measurement.
A characteristic of inductive current clamps is they have a tendency to " drift" from their zero point as a result of temperature or as a result of the environment they are operating. Periodic zeroing of the current clamp during prolonged use is good practice and allows you to confirm the current you are measuring is correct relative to " zero "
However having said all that, as mentioned in Kim's post above, please take time to read topic 9482.
Every post is packed full of information regarding parasitic measurements and a reason why you would NOT zero your current clamp for extended parasitic drain tests ( over 12 hours) !
If you have any concerns about the clamp or feel the accuracy is not as expected when compared to your other clamp could you email into firstname.lastname@example.org
If you can include a brief description and include this thread as a reference we can take a look for you and confirm the accuracy and any errors.
It would appear our Freelander is settling around 125 to 150 mA and this would be of concern but beware.
From my experience there has often been times when I could see this level of discharge for over 1 hour. This often occurred If the vehicle had been recovered with a discharged battery. (The battery would be recharged but fail the parasitic drain test)
The internal battery back up feature-built into the alarm siren would also discharge with the 12 V vehicle battery and would require recharging from the vehicle battery. This process could be seen in the parasitic measurement, and confirmed by disconnecting the alarm siren.
It would appear the more laden a vehicle with networks and nodes the more likely we see prolonged shutdown periods and parasitic current draw that pushes the limits.
As a general rule of thumb, if I can see less than 80 mA parasitic current drain for a sustained period ( no further activity) then this would suffice. ( keeping any SMART keys out of vehicle detection range)
Speaking to numerous manufacturers I will not comment on what a certain VM claimed was acceptable other than to say good luck if leaving your vehicle parked for 3 days!
I hope this helps. Take care. Steve