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Fred Abse
Guest
Fri Jan 27, 2012 9:39 pm
On Fri, 27 Jan 2012 11:03:21 -0800, melissa walraven wrote:
Quote:
On Jan 27, 1:39 pm, Fred Abse <excretatau...@invalid.invalid> wrote:
On Fri, 27 Jan 2012 10:32:42 -0800, melissa walraven wrote:
I am trying to measure atleast 800 Volts acorss the capacitor. I am
unable to understand that does this scope can do differential
measurement using MATH option A - B. I read the user manual but unable
to understand.
You apply the A probe to one end, and the B probe to the other end, then
A-B is the *difference* between the ends.
That's what "differential" means.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
Where should I connect the Ground of the probes?
To any convenient zero volts point, If the scope's common mode rejection
in subtract mode is good enough, which I doubt, you might get away with
leaving hem floating.
You *must* make sure that both probes are properly compensated with their
respective inputs. That really affects common mode rejection.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
Winston
Guest
Fri Jan 27, 2012 10:51 pm
melissa walraven wrote:
Quote:
On Jan 27, 3:13 pm, Winston<Wins...@Bigbrother.net> wrote:
melissa walraven wrote:
(...)
Where should I connect the Ground of the probes?
Both go to the common ground return of your circuit.
You will not need a differential probe if one end
of the capacitor is already grounded.
--Winston
One end is connected to source and the other end is connected to
resistor.
melissa
Life would be very much easier if we had a good idea
of the circuit you are using. Please consider using
either AACircuit or LTSpice to post an asciimatic?
View in Courier font:
___
Vdd---|___|-----.
|
|
|
||-+
||<-
-||-+
| Expected 800 V p-p
| || V ___
o----||-----|___|-
| ||
|
|
.-.
| |
| | 0.01 ohms
'-'
|
|
===
GND
Exactly like this, right?
(created by AACircuit v1.28.6 beta 04/19/05
www.tech-chat.de)
--Winston
melissa walraven
Guest
Fri Jan 27, 2012 11:02 pm
On Jan 27, 3:13 pm, Winston <Wins...@Bigbrother.net> wrote:
Quote:
melissa walraven wrote:
(...)
Where should I connect the Ground of the probes?
Both go to the common ground return of your circuit.
You will not need a differential probe if one end
of the capacitor is already grounded.
--Winston
One end is connected to source and the other end is connected to
resistor.
melissa
John Fields
Guest
Fri Jan 27, 2012 11:06 pm
On Fri, 27 Jan 2012 13:02:59 -0800 (PST), melissa walraven
<walravenmelissa_at_gmail.com> wrote:
Quote:
On Jan 27, 3:13 pm, Winston <Wins...@Bigbrother.net> wrote:
melissa walraven wrote:
(...)
Where should I connect the Ground of the probes?
Both go to the common ground return of your circuit.
You will not need a differential probe if one end
of the capacitor is already grounded.
--Winston
One end is connected to source and the other end is connected to
resistor.
---
This is fairly late to be mentioning that there's a resistor in there
too.
Can you post a sketch of your circuit, please?
--
JF
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