Author Topic: BK2790B@ 500V fuses  (Read 1643 times)

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Offline Maciek

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BK2790B@ 500V fuses
« on: March 22, 2013, 11:52:06 am »
I skimped through the post about DMMs not compliant to their specifications and I am curious about not meeting CAT standards by the BK 2709B DMM. Following the manual part regarding input protection:
"Input Protection 0.5 A/500 V & 10 A/600 V fast blow ceramic fuses".
There is a comment in the post that the meter actually has 2x500V fuses so I am thinking if replacing fuses with 600V version will make it better. I noticed that some meters have their fuses spec'd like e.g. @0.5A/600-1000V & @10-15A/1000V. Does anyone tried swapping in 2809B?  :-/O I am wondering if putting there 600V fuses will make other parts of circuitry blow. Is it a very serious issue? Ideal 61-342 has it marked as minor inconsequence and not following the specs. Thanks in advance for explanation.

Offline tinhead

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Re: BK2790B@ 500V fuses
« Reply #1 on: April 24, 2013, 04:32:22 pm »
i got 2709B with fuses exactly as described in manual -> 0.5A/500V and 10A/600V.
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Offline Lightages

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Re: BK2790B@ 500V fuses
« Reply #2 on: April 24, 2013, 05:59:39 pm »
Replacing fuses with a higher voltage rating is never a bad idea. It doesn't not mean that the meter is now capable of a higher safety rating. It is more than just the fuses. In the case of the Ideal meter the fuse is rated very close to the CAT rating and so I deemed it less and issue than a meter that has little glass fuses rated for 250V when the meter is supposed to be rated for 600V+.

A higher voltage rating on a fuse means it will reliably interrupt a higher voltage whereas a lower voltage rated one will possible still continue to pass current with a voltage applied higher than its rating. Higher voltage fuses are good things and cannot harm your meter.

The BK 2709B had 500V rated fuses inside it with Dave's review (unless I read them wrong) so I prefer to leave this as a warning. It makes it even worse if the meter is being supplied with fuses less than specified on the manual.

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