Seaward checkbox 16

[allyodowd]

I am using a seaward checkbox 16 to check my Meggar MFT1552. All checks ok until i try to do the Earth Loop (cannot use plug and bonded metal probe at the same time). Can anybody advise me on this or if i need to purchase a new checkbox??

 

[geoffpink]

Hi did you ever solve this issue, as i have found the same thing?

 

[MarkieSparkie]

It's been a while since I've used a Seaward Checkbox 16. The solution to your problem is to use your MFTs 3 lead set and a Kewtech R2 or Socket & See SS130 socket adaptor, or alternatively use a break-out box.

My Loop Check Method:
1) Plug the socket adaptor into the Checkbox socket and connect the checkbox to the supply.
2) Connect L probe to L of socket adaptor.
3) Join (piggy back) N probe and E probe together and insert into Loop 4mm socket on the checkbox, test and note the reading.
4) Remove the joined probes from the Loop socket and insert them into Loop+5R 4mm socket on the checkbox, test and note the reading.
5) Compare the difference of the two readings with the current calibration certificate or test certificate on the back of the checkbox.