- #1
What is causing the strange signal on my PMT R928?
In summary, the conversation is about the Hamamatsu R928 and the strange signal it produces when connected to a power supply and oscilloscope. The person is looking for the origin of the signal and asks for more information, such as if it is covered or open, what type of fixture is being used, and for a schematic. The OP responds that it is open and uses a standard D type socket assembly E717-63, with a vertical scale of 5mV/division and a horizontal scale of 20ns/division. They mention that the signal looks strange and they are not able to see any signal like in the typical PMT setup. Another person suggests using a flashlight or TV remote control to test the PMT
- #2
berkeman
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Is it covered or open? What kind of fixture are you plugging it into? Can you post your schematic?
https://www.hamamatsu.com/blobs/1328784013964?blobheadername1=content-disposition&blobheadervalue1=inline%3Bfilename%3D1328467311959.jpg&ssbinary=true
https://www.hamamatsu.com/blobs/1328784013964?blobheadername1=content-disposition&blobheadervalue1=inline%3Bfilename%3D1328467311959.jpg&ssbinary=true
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- #3
- #4
jim hardy
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What are vertical scale and timebase on that 'scope trace ?
In other words - what do we know about your "noise" ?
120 hz would likely be nearby fluorescent lights.
In other words - what do we know about your "noise" ?
120 hz would likely be nearby fluorescent lights.
- #5
Rive
Science Advisor
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So far it looks like common EMI from an SMPS nearby.
- #6
- #7
jim hardy
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what does yours look like at those people's settings?
\
shine a flashlight on it through a fan blade.
or point your TV remote control at it and press a button.
tv remote is typically just a bit longer than 900 nm so the tubewill probably see it.
.
oops make that might see it.
..
\
shine a flashlight on it through a fan blade.
or point your TV remote control at it and press a button.
tv remote is typically just a bit longer than 900 nm so the tube
.
oops make that might see it.
..
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Last edited:
What is a PMT R928?
A PMT R928 is a type of photomultiplier tube, which is a device that detects and amplifies light signals. It is commonly used in scientific research, medical imaging, and other applications that require high sensitivity detection of light.
What is a "strange signal" in relation to a PMT R928?
A "strange signal" refers to an abnormal or unexpected output from the PMT R928. This could be in the form of a sudden spike, inconsistent readings, or other unusual patterns that deviate from the expected behavior of the device.
What are some potential causes of a strange signal in a PMT R928?
There are several factors that could contribute to a strange signal in a PMT R928, including environmental conditions (such as temperature or electromagnetic interference), improper setup or calibration, malfunctioning components, or external light sources.
How can a strange signal in a PMT R928 be addressed?
The first step in addressing a strange signal is to thoroughly check and troubleshoot the equipment and setup. This may involve adjusting settings, replacing faulty components, or minimizing external disturbances. If the issue persists, further investigation and analysis may be necessary.
Are there any measures that can prevent or minimize strange signals in a PMT R928?
Yes, there are several measures that can help prevent or minimize strange signals in a PMT R928. These include properly shielding the device from external light and interference, regularly calibrating and maintaining the equipment, and following best practices for experimental setup and data collection.
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