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Hi, FvM
Thanks for response.
As I noted, I measure near ground pad with below 1 inch(maybe below 10mm), The result is 3mV. Could I trust measuring result. Is that not negligible?
Best regards,
SunSung
Hi, Milad-D
Please let me know about details about your saying
.
What do you mean as AC gain, after 1MHz(How do you figure out 1MHz).
Best regards,
SunSung
Hi, FvM and Milad-D
I think that before more thing to do what you said, the first thing I shoud do is
improve measurement accuracy.
So, I tested referring to the material **broken link removed**.
As you see the attached image. I measure ground voltage on PCB with probe with sprung earth-tip...
Many thanks for response.
Although more calculation needed, Sampling speed to need would by 400Hz or more.
Distance between sensor and PCB is 1.5M. But Currently I connected shield cable for signal line, opened
wire for exc line.
The resonance with Fig. A_3_8, is found when flourescent lamp is...
Thanks for your interests.
I increased LC filter value between TP1 and TP2, 1mH and 10uF, but I cannot find significant change on noise figure. and 4 order with same values made more fluctuation than before.
The TP1 and TP2 test graph is attached.
Please let me know about the detailed...
Many thanks for your responses.
I will immediately return more accurate results.
You are correct. The attached spectrum result is at final stage (at Test Point 4 on shematic).
Please notify if you know materials about accurate probing.
Best regards,
---------- Post added at 06:02 ----------...
Thanks for your response.
The current test schematic is attached.
Test result is as follows,
TP1 noise 45mV(Peak to Peak)
TP2 noise 23mV(Peak to Peak)
TP3 noise 16mV(Peak to Peak)
TP4 noise 15mV(Peak to Peak)
The change on 2 order to 4 order seems to be little effect on ripple after...
I'm designing high precision pressure sensor signal conditioner.
And I would like to reduce noise.
Although many issue about the attached schematic exist, initially noise at between TP7/TP8 and 24PC sensor.
<Test 1>
When 3Pin(GND), 1Pin(+10V) is established, then meaure at TP7...
I am using commercial SMPS +5, +/-5V output.
Against SMPS output, I applied LC filter, and achieved 45mV noise down to 20mV noise, but I need about 5mV or below.
Please anyone help me about how to find cutoff frequency not easy to figure out
The microscopic view is after currently...
1) Please let me know about Over-Temperature protection circuit examples for
power supply unit.
2) NTC thermistor SMT would be used, which place on pcb is to be used sensor
contacts?
Thanking you
SunSUng
Hi,
Thanks for your comment.
Not good-experienced, I would like to know what switcher mentioned is.
If possible, please let me know where I find sample schematic.
Best regards,
SunSung Hwang
I would like to design Power supply with very stable and low ripple for analog measurement application.
For regulation from +15 to +5V, from -15 to -5V 3A, about 3Vx3A voltage drop is needed for too much heat.
Please advice me a better alternative for voltage drop under stabilty and ripple...
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