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Tank Circuit
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Join Date: Jul 2011
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Diode with Half Arrow Symbol Means?

02/08/2013 3:33 PM

Can someone please tell me why the diode symbols in this diagram of the multiminor mk4 multimeter just have a half arrow please?
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SimpleMind
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#1

Re: Diode with half arrow symbol means?

02/08/2013 3:44 PM

Because the designer was restricted by ink budget cuts. S.M.

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SolarEagle
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#2

Re: Diode with half arrow symbol means?

02/08/2013 3:50 PM

Maybe it only works half the time..?

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redfred
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#3

Re: Diode with Half Arrow Symbol Means?

02/08/2013 5:04 PM

I believe what you have is a old Shockley diode there.

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Tank Circuit
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#4
In reply to #3

Re: Diode with Half Arrow Symbol Means?

02/08/2013 5:59 PM

Thankyou, it might well be. I looked online just now for shockley and can find some near matches for my symbol but none just the same. Maybe mine is some old U.K. version. david
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SolarEagle
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#5
In reply to #3

Re: Diode with Half Arrow Symbol Means?

02/08/2013 7:36 PM
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SimpleMind
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#6
In reply to #3

Re: Diode with Half Arrow Symbol Means?

02/08/2013 7:54 PM

Half diac, to delinearize or trigger what? The AVO moving coil? (LOL) It's a plain diode.

. S.M.

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Tank Circuit
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#8
In reply to #6

Re: Diode with Half Arrow Symbol Means?

02/08/2013 10:49 PM

Might just be a plain diode ... it makes sense since it just seems to be rectifying A.C. So is the symbol just old version? I have the actual meter and I have looked... but it could be anything.
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Tobugrynbak
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#15
In reply to #3

Re: Diode with Half Arrow Symbol Means?

02/09/2013 2:51 PM

Now there's something to scare the apprentices with!

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europium
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#16
In reply to #3

Re: Diode with Half Arrow Symbol Means?

02/09/2013 4:25 PM

The new Shockley diodes are fast.

The old ones?

Halfast.
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redfred
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#17
In reply to #16

Re: Diode with Half Arrow Symbol Means?

02/09/2013 5:56 PM

Pun noted but a Shockley diode is very different device from the more common, very fast Schottky diode.

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K_Fry
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#18
In reply to #17

Re: Diode with Half Arrow Symbol Means?

02/10/2013 5:27 PM

Strangely enough, your link from above refers mainly to Shockley diodes but at one point adds another variety, the Shottley.

In Figure 13 we have created a parameterized Shottley devices U1. The AC source V4 is 110V. The parameters passed to the devices U1 and pwl source will have the values shown in Figure 8.

Use four of these, drop a t and get one of these.

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Fredski
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#7

Re: Diode with Half Arrow Symbol Means?

02/08/2013 9:19 PM

its a diode, sort of like a check valve for electricity
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Sid_Sidow
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#9
In reply to #7

Re: Diode with Half Arrow Symbol Means?

02/08/2013 11:00 PM

Fredski - I spent my education learning electronics. For the last 30+ years, I have worked on laboratory blood analyzers - much fluidics. My old boss used to wonder why we learned electronics to work on plumbing.

BUT, I find so much in the plumbing/fluidics is so related to electronics.... a tube is a wire, a one-way/mono-flow valve is a diode, a coil of tubing is a choke/resistor, a tank is a capacitor.............

Most days, I do not need the electronics - but wait until there is noise on a line or a CPU that needs work. THEN the electronics guys gets called!!!

The plumber or mechanic rarely knows electricity. If you know electricity, you can master plumbing and mechanics.

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fixitorelse
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#10
In reply to #9

Re: Diode with Half Arrow Symbol Means?

02/09/2013 6:03 AM

Some what off topics but you are correct. A good electrician makes a good trouble shooter for hydraulics and other such issues.
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cuba_pete
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#19
In reply to #9

Re: Diode with Half Arrow Symbol Means?

02/14/2013 1:14 PM

It's funny too that in electronics we often try to put things into layman terms using water flow as an analogy which helps people visualize and understand the theory of electricity easier.
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ci139
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#11

Re: Diode with Half Arrow Symbol Means?

02/09/2013 7:58 AM

Google [ Avometer 8, 8X and 9 MK4 spare parts ]

reads type OA95

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Tank Circuit
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#14
In reply to #11

Re: Diode with Half Arrow Symbol Means?

02/09/2013 1:50 PM

Thanks. In one of the manuals there is a circuit diagram from AVO of the same multimeter with the "normal" diode symbols and it says it is a OA95 which is a "normal" diode.
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Rixter
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#12

Re: Diode with Half Arrow Symbol Means?

02/09/2013 8:10 AM

This is an antique. Perhaps symbols were not as standardized when it was built.
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Tank Circuit
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#13
In reply to #12

Re: Diode with Half Arrow Symbol Means?

02/09/2013 1:35 PM

Yes I know its antique and that has an appeal to me. All that Bakelite and chunky switches and aesthetic design.
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Users who posted comments:

ci139 (1); cuba_pete (1); europium (1); fixitorelse (1); Fredski (1); K_Fry (1); redfred (2); Rixter (1); Sid_Sidow (1); SimpleMind (2); SolarEagle (2); Tank Circuit (4); Tobugrynbak (1)

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