Make your own "Checkbox"

[SPECIAL LOCATION]

http://cgi.ebay.co.uk/CalCard-Checkbox-Calibration-Check-Box-Meter-Part-P_W0QQitemZ320275872983QQcmdZViewItem?hash=item320275872983have a look at this

That looks very good....

almost too good to be true?

anyone got one????

 

[a1]

Morning Pat & Specs.

Yes Gents - I have seen them before on eBay, but I never bought one.

 

[patspark]

i am bidding for one now as soon as i get it will let you know

 

[patspark]

sorry how rude good morning admin&specs

 

[SPECIAL LOCATION]

i am bidding for one now as soon as i get it will let you know

You are Officially nominated at the "Forum guinea pig" to test this item...

then give us all a full road test report! :x :|

 

[SPECIAL LOCATION]

Morning Pat & Specs.Yes Gents - I have seen them before on eBay, but I never bought one.

morning indeed sir....

is it time for you to go to fill up the car yet??

or is that another half hour! :^O :^O;\ ]

 

[SPECIAL LOCATION]

sorry how rude good morning admin&specs

nooooooo:O

you can be a LOT ruder than that!!

try..

Ere you! fatty sparky no-brains... what time you call this wakin me up!!! ] ] :^O :^O:^O:^O:O

 

[a1]

]

I'm off for a cig - see you Tomorrow.

Before I go - Hve you seen KME, Specs?

 

[patspark]

You are Officially nominated at the "Forum guinea pig" to test this item...then give us all a full road test report! :x :|

no problem will do

 

[SPECIAL LOCATION]

] I'm off for a cig - see you Tomorrow.

Before I go - Hve you seen KME, Specs?

nope!!! ?????? ?:| ? :| ?:| :| :|

 

[SPECIAL LOCATION]

] I'm off for a cig - see you Tomorrow.

Before I go - Hve you seen KME, Specs?

Actually you probably won't......!!! :O:O :x :x:x:^O:^O:^O:^O

 

[Mr Sworld]

http://cgi.ebay.co.uk/CalCard-Checkbox-Calibration-Check-Box-Meter-Part-P_W0QQitemZ320275872983QQcmdZViewItem?hash=item320275872983have a look at this

Hmmmm..... Note that the tolerances are 3%! So at 20M Ohm you could be 200K Ohm out either way!

 

[SPECIAL LOCATION]

Hmmmm..... Note that the tolerances are 3%! So at 20M Ohm you could be 200K Ohm out either way!

Ahh! thats the snag then!!

 

[Mr Sworld]

Hmmmm..... Note that the tolerances are 3%! So at 20M Ohm you could be 200K Ohm out either way!

Sorry.... That's wrong!

The 3% tolerance can give:

0.25 Ohm = 0.075 ohms out either way

0.5 Ohm = 0.15 ohms out either way

1 Ohm = 0.3 ohms out either way

2 Ohm = 0.6 ohms out either way

5 Ohm = 1.5 ohms out either way

0.5M Ohm = 15K ohms out either way

1M Ohm = 30K ohms out either way

2M Ohm = 60K ohms out either way

10M Ohm = 300K ohms out either way

20M Ohm = 600K ohms out either way

Ok, it's not a huge thing at 0.5M Ohm but at the lower levels it's quite a difference for R1+R2 testing.

And this bloke has quite a good point about the fact that test boxes are not a substitute for annual calibration.

 

[a1]

Good Afternoon, Mr Sworld, Sir.

 

[Mr Sworld]

Hello Admin. Hope I find you well.

 

[a1]

Indeed you do, Sir.

Double checking the items to go camping soon.

 

[Mr Sworld]

Indeed you do, Sir. Double checking the items to go camping soon.

Box of 'wet wipes' is in the top ten! :^O

 

[patspark]

http://cgi.ebay.co.uk/CalCard-Checkbox-Calibration-Check-Box-Meter-Part-P_W0QQitemZ320275872983QQcmdZViewItem?hash=item320275872983have a look at this

just bought it for

 

[Flying Scotsman]

just bought it for