Are the calculators magnet-proof?

General discussion about calculators, Swiss Micros or otherwise
michaelzinn
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Are the calculators magnet-proof?

Post by michaelzinn » Sat Nov 30, 2019 7:36 pm

Hi.

Can I keep the calculators next to regular magnets (e.g. refrigerator magnets)? I understand that a hard drive or floppy disk would be problematic because they store data magnetically, but do the SwissMicros replicas contain anything that could be affected?

Thanks!

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Walter
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Re: Are the calculators magnet-proof?

Post by Walter » Sat Nov 30, 2019 9:56 pm

I'd dare to state that they are magnet-proof.

Reasoning: Data are no more stored in magnetic cores. Nor is any magnetic disk or the like implemented in this calculator. There are neither Hall sensors nor Reed relais built in. And there aren't any electron tubes like in your great-grandparents' radios or your grandparents' or parents' TV sets. Instead, all good'ol silicon electronics. No chance for static magnetism to influence anything.

So don't worry, be happy! Enjoy!
DM42 SN: 00041 Beta
WP 43S running on this device

HP-35, HP-45, ..., HP-50, WP 34S, WP 31S, DM16L

WigglePig
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Re: Are the calculators magnet-proof?

Post by WigglePig » Fri Dec 20, 2019 9:37 am

I have now tested my DM15 in some serious magnetic fields and I can confirm that:
a) the DM15 is not adversely affected by static magnetic fields of around 1T
b) the DM15 is caused to give sporadic garbled output with alternating fields (50 Hz and 400 Hz) of over 0.8 T
c) the casing screws seem to be very interesting in a static field of 8T
d) my DM15 is still working perfectly after being abused in this way.

Regards

Jason :D

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Walter
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Re: Are the calculators magnet-proof?

Post by Walter » Fri Dec 20, 2019 4:33 pm

WigglePig wrote:
Fri Dec 20, 2019 9:37 am
I have now tested my DM15 in some serious magnetic fields and I can confirm that:
a) the DM15 is not adversely affected by static magnetic fields of around 1T
b) the DM15 is caused to give sporadic garbled output with alternating fields (50 Hz and 400 Hz) of over 0.8 T
c) the casing screws seem to be very interesting in a static field of 8T
d) my DM15 is still working perfectly after being abused in this way.
Which is the lab you work in?
DM42 SN: 00041 Beta
WP 43S running on this device

HP-35, HP-45, ..., HP-50, WP 34S, WP 31S, DM16L

WigglePig
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Re: Are the calculators magnet-proof?

Post by WigglePig » Wed May 13, 2020 2:56 pm

Ahh, well that would be telling!

Suffice to say that high-power radio transmitter equipment can generated really quite large magnetic fields, usually around the power supply systems for the power amplifier final stages.

Regards
Piggly

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RAPo
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Re: Are the calculators magnet-proof?

Post by RAPo » Wed May 13, 2020 6:31 pm

well you need 16 T in order to levitate a frog (https://www.newscientist.com/article/mg ... irrelevant).
DM41X beta: SN00018.
DM42 beta: SN00074.
DM10L: SN056/100.
DM11L: SN 02058.
DM15L: SN2074.
DM16L: SN2156.
DM15, DM16, DM41
and a whole bunch of the original HP's,

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Walter
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Re: Are the calculators magnet-proof?

Post by Walter » Wed May 13, 2020 7:51 pm

RAPo wrote:
Wed May 13, 2020 6:31 pm
well you need 16 T in order to levitate a frog (https://www.newscientist.com/article/mg ... irrelevant).
Thanks for sharing. 16 T is huge! 8-)
DM42 SN: 00041 Beta
WP 43S running on this device

HP-35, HP-45, ..., HP-50, WP 34S, WP 31S, DM16L

toml_12953
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Re: Are the calculators magnet-proof?

Post by toml_12953 » Thu May 14, 2020 3:16 am

RAPo wrote:
Wed May 13, 2020 6:31 pm
well you need 16 T in order to levitate a frog (https://www.newscientist.com/article/mg ... irrelevant).
Flying cars* anyone?

* All the rage in views of the future from the 1930s to the '50s
Tom L

I bought a moving blanket but it just sits there.

DM10L SN: 059/100
DM41X SN: 00023 (Beta)
DM42 SN: 00025 (Beta)
DM42 SN: 00221 (Shipping)

Olivier de Nantes
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Re: Are the calculators magnet-proof?

Post by Olivier de Nantes » Thu May 14, 2020 7:28 am

I may give you some more informations.

I worked for some years in a smelter in France (Pechiney plant). This plant was (and still is) producing primary aluminium. In order to do so, they actually use 380 000 Amps under 1024 Volts, in 254 tanks with a electrical connexion in serial configuration ; when I was working there, it was only 280 000 Amps.
That produce very strong magnetic fields which is dangerous for people using a pacemaker of less big problem, with mechanical swatches.

They were no problem with the calculator I sometime use in the workshop (it was a HP 42s : I'm not sure that this company and model are really known in this forum :) ).

The 42s is still working without any trouble.

However, I did not try a SwissMicros calculator !

But if it can help

Olivier
Olivier de Nantes (Bretagne)


HP41 (x3 : 2CV / 1CX), HP 42S, HP 48G+, HP 71B, HP 15C LE, HP 35S, HP PRIME

DM41L, DM 41X (Beta - SN: 00078), DM 42 (SN: 1028)

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Walter
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Re: Are the calculators magnet-proof?

Post by Walter » Thu May 14, 2020 9:51 am

There shouldn't be any problem with any modern pocket calculator as long as we talk about static magnetic fields and the calculator isn't moving fast. :mrgreen: Reasons are given in post #2. :geek: And since the calculator back is made of stainless (austhenitic) steel, it won't even start moving fast on its own. :shock: So don't worry, be happy. 8-)
DM42 SN: 00041 Beta
WP 43S running on this device

HP-35, HP-45, ..., HP-50, WP 34S, WP 31S, DM16L

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