IMPORTANT/Laser

[Faber]

Hi guys
I use a Bushnell Yardage pro,and discovered some interesting thing about it..

I went out to this new discovered A to laser it,it said 155ftjust below the exitpoint(at SERVAL shots arround the A),then i wanted to do the acurate by Phytagoras thing,but then i run out of power..

150ish is high enough to me to SL by lasering it that way so i jumped it a few days later i jumped it and found myself having a long canopyride.. hmm

Last nite i then climbed the thing after i had turned my Alti-watch on(accuresy whith in 3ft)it said 183ft at the top...

I have this morning been out there whith fresh battery on my laser and lasered it again,now it says 180ft... either the way i started whith or the phytagoras..

Therefore please make sure your batteryes are fresh.. Atleast it messured it wrong in my favor...

Any others had similar experience?

[BASE_689]

> I went out to this new discovered A to laser it,it said 155 ft - 47 m just below the exitpoint (at SEVERAL shots arround the A), then i wanted to do the acurate by Phytagoras thing, but then i run out of power...
> ...
> Therefore please make sure your batteryes are fresh.. Atleast it messured it wrong in my favor...

My comments are as follows.
1) Yes, it's a good thing indeed to operate our electronics devices (laser included) with fresh (or semi-fresh) batteries.
2) While I do understand that you got several measurements, all of them giving (initially) results in the range of 155 ft - 47 m, measuring an object from below is "by definition" a conservative measurement, i.e., there is NO WAY (unless malfunction occurs) that you can ever measure HIGHER than actual height, because (in case of A's) you CANNOT hit anything higher than the A itself.
The other possibility (=measuring way less than the actual height) exists: during nighttime measurements, you could hit with laser beam any sort of "piece" protruding off the vertical of object at a lower level than tip of object itself, you don't notice such a piece of metal/antenna/ladder/stick/whatever-else-protruding-off-the-object and so you measure something that is BELOW tip of object, thinking about measuring tip of object.
End of the story: if you cannot simply measure from exit point to ground ( ) , when you measure object's height from below (if necessary, using Phytagoras), it's way useful to do several and several measurements (15-20-30 measurements) just to avoid "false hittings" of laser beam; furthermore, repeat measurements measuring height on another point/face (if possible) of object: the (possible) protrusion can exist only on a single side/location of object, and so second measurement site is free form such a protrusion.
When you get consistently different height measurements got from two locations, it is a good reason to repeat again measurements, possibly on a third location on the object.
I say it again: unless you are using a laser with nearly flat batteries, there is reasonably no reason/possibility that you measure higher (dangerous!!!) than actual height of object.
Indeed, it is very possible that you measure way lower than actual height of object's tip (=laser beam can hit "something" that you cannot notice during your nighttime operation, which "something" is (99.99% of time) lower than object's tip.
In oue experience, all our measurements done from below (with methods/techniques above described) has ALWAYS been NOT HIGHER (=equal or lower) than measurements done from exit point hitting ground (measurement that has got virtually no possibility of error).
Just my 0.02€.

[Mac]

during nighttime measurements, you could hit with laser beam any sort of "piece" protruding off the vertical of object at a lower level than tip of object itself, you don't notice such a piece of metal/antenna/ladder/stick/whatever-else-protruding-off-the-object and so you measure something that is BELOW tip of object, thinking about measuring tip of object.

what laser are you using for nighttime measurements, I only ask as I use a yardage pro and its not useable really for dark time.

Thanks

M

[Faber]

Hi Andrea
I do agree whith you,what i wanted were to inform people not to trust 100%on the lasers only...

BUT..actualy you can meassure higher in case your not directly below the exit point as of the distance into the object will do a difference,giving you a slightly(not much)higher result than if you do it by Phytagoras...

To note the object were lasered in daytime,so im really sure i didnt hit anything below,plus i did it from 3 different places...

I do agree that you cant meassure higher than the object unless somthing is behind it..

As said it were made to tell people not completly trust the gadgests(or atleast only one)

[BASE_689]

Mac:
> what laser are you using for nighttime measurements?
My Yardage Pro 800 Compact has got a very nice lighted up screen, and lets me read the height in whichever light conditions (even in total darkness). Note: during nighttime, if I want to do a second (immediate) measurement, I cannot, because the lighted up screen disturbes the aiming with cross-hair pointer, I wait few seconds that light goes down (but the instrument is still on), I aim and I do another measurement.

Faber:
> BUT..actually you can measure higher in case you are not directly below the exit point as of the distance into the object will do a difference, giving you a slightly (not much) higher result than if you do it by Phytagoras...
Definitely:
1) if I am 14 m (my 800 compact CANNOT measure distances shorter than 14 m) within the object base, I keep the measurement (done "repeatedly" as above) good and I simply "cut" 2-3 m from the number I read on display (if I measure 35 m of "diagonal distance" and I am at 14 m of "horizontal distance" from object's base, Phytagoras gives 32 m as actual height, so cutting 3 m from "diagonal distance" is a good choice)
2) if I am 14 m (and further) off the object base, I do the two sets of "diagonal distance" and "horizontal distance" measurements and I use Phytagoras.
It's simple, isn't it?

> To note the object were lasered in daytime, so I'm really sure i didn't hit anything below,plus i did it from 3 different places...
Definitely it must have been the fact that your batteries where about to be flat!!!!!!

> As said it were made to tell people not completly trust the gadgests(or atleast only one)
Agreed in full: if in doubt, consider the object few meters lower and continue to do measurements, also in different days (possibly after having given a good recharge to your batteries (you know I am the bloke of rechargeables, don't you? ))

[Faber]

yeah i agree Andrea...

By the way what the highest 9V. battery(mha) you get theese days?

the 2500mha AA batteryes has just arrived to DK,sadly you can only get a charger to 2300mha

[BASE_689]

> what the highest 9V. battery(mha) you get theese days?
These days you can get a nice 250 mAh as of a 9 V ("transistor") battery.

> the 2500mha AA batteries has just arrived to DK,
These days the most powerful AA batteries you can find are 2600 mAh (there are news also of 2800 mAh).

> sadly you can only get a charger to 2300mha
They told you bullsh|t!!!!!!!!!! There is NO 2000-2300-2500-2800 mAh battery charger!!!!!!
There are just "NiMH battery chargers"!!!!!! Yes, some charger can be slow, some charger can be fast, but a charger simply charges up a battery and that's it!!!!!!!
The charger (having an IC inside), measuring the voltage the battery has reached, decides when same battery is "full" and stops charging (tipically switching relevant LED from red (charge) to green (stand-by)).
Yes, using the same charger, a 2600 mAh AA battery will take longer to be fully charged with respect to a 2300 mAh AA battery, but ANY battery, sooner or later, will be fully charged by your battery charger!!!!!!
Suppose the charger stops charging a battery when same reaches, let's say, 1.35 V: now, starting both from "flat state", a 2600 mAh battery will take longer to reach 1.35 V with respect to a 2300 mAh battery, but both will be fully charged by same charger.
Think of AA NiMH rechargeable batteries of different capacities as of water buckets of same height but different diameter: if you put a water bucket of 30 cm of diameter under tap 1 at a X height and another water bucket of 42 cm of diameter under tap 2 at same X height and same water flow as tap 1.
30 cm water bucket will take 10 minutes (let's say) to be completely filled, 42 cm water bucket will take 20 minutes to be completely filled (under tap 2 of same characteristics as tap 1), but it will definitely be completely filled up till the edge as well as the smaller bucket!!!!!!!!
Don't be fooled around by electronic shop keeper that try to sell you " a charger to is manufactured EXACTLY to charge your new very powerful batteries"!!!!!!!!!!!!!!
Just keep your good battery charger!!!!!!!! As long as you will charge AA NiMH batteries, it will last for a good while!!!!!!

[Faber]

thanks mate i learn somthing from all your posts