To find the constant value

MKK

New Member
Joined
Nov 15, 2005
Messages
20
Hello All,

This is to find out the value of the diode under different circumstances.here i have to increase the temperature step by step and side by side measuring the value of the diode.now at particular temperature it becomes stable i have to find the value of the diode at that point.
how to find it ..can anyone just help me to find out.

thankyou very much

Regards,

MKK
 

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GlennUK

Well-known Member
Joined
Jul 8, 2002
Messages
11,701
What's the question in Excel terms? Or did you accidently post this here instead of on the Lab Praticals Help website?
 

MKK

New Member
Joined
Nov 15, 2005
Messages
20
Automated Test Equipment using Excel VBA

Ah no sorry..for not being specific.
Iam using a Thermostream 4200A. we are using Excel VBA to automate it.
the thermostream is connected through GPIB.
Now I have to increase the temperature through Thermostream.This can be done through GPIB commands available.

Now i just need to find it how to find the point at which the diode value becomes stable.
Is there any commands that compare each obtained values and compare it..and once it is stable it has to stop it.
 

MKK

New Member
Joined
Nov 15, 2005
Messages
20
can anyone helpme out...

Hello all..

I still could not find a right solution for it..can anyone help me...

Regards,
MKK
 

ljtong

Board Regular
Joined
May 23, 2005
Messages
71

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as I understand your question,

x-axis = temperature
y-axis = diode value

u want the first instance where the slope of the diode value equals 0?
because 0 slope means "stable", i.e a flat line?
 

MKK

New Member
Joined
Nov 15, 2005
Messages
20
Thanks

thanks for your reply.
yes,exactly.. I have to find that point where it becomes stable..and plot it..
and i have to increase the temperature again..and see when it becomes stable again..this continues till the maximum temperature it can withstand.

waiting for yu reply.
Thanks

Regards,
MKK
 

ljtong

Board Regular
Joined
May 23, 2005
Messages
71
so column A = temperature
column B = diode value

and make column c2 = B2-B1 , c3= B3-B2 and so on...

using conditional format, highlight the values where
B < tolerance
 

MKK

New Member
Joined
Nov 15, 2005
Messages
20
thanks

thanks...it seems to be a nice one...

first i thought of calculating like...
taking temp as Tn

Tn-(0.5Tn-1 + 0.3 Tn-2 +0.2 tn-3 )
to find the points accumulated around a particular value..

but lets see..

thanks once again..

Regards,
MKK
 
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