Products > Test Equipment
Should I Buy the Finrsi DSO510 on a Tight Budget?
tggzzz:
--- Quote from: osmax_br on February 11, 2025, 01:15:48 am ---Well , guys I have a stupid question
My analog scope (os9020g 20mhz plus 1 mhz function generator) that I bought is out of calibration, it was in a humid storage environment for 30 years
HOW DO I CALIBRATE THIS THING WIITHOUT SEPARATE FUNCTION GENERATOR, I have the service manual
However I only have a dmm (cheap one) and this scope
My stupid question is : can I do a BASIC calibration using the built-in function gen, or it is a stupid idea
And if it is a stupid idea (most probably is) , what is the least expensive thing I can buy to calibrate this thing , should I just do a simple crystal oscillator circuit and call it a day?!!
Or just leave it as is since I might do more de-calibration than calibration with my not-good equipment
Also one more stupid question, when I push times 10 knob, the crt becomes very dim that I barly see a trace , any suggestions about the problem or a guess why it happened?
--- End quote ---
The principal function of a scope is to show a waveform's shape, not the absolute voltage, not the absolute timing. Analogue scopes are about as accurate as an analogue multimeter, around 2%.
To calibrate the vertical deflection, use a PSU as a voltage source, and measure the voltage with a DVM (which should be much better than 2%).
To calibrate the horizontal deflection, you need a known frequency. Mains frequency will be accurate to better than 1%, except in exceptional conditions. Do not connect to the mains; just connect a wire to the input and you will see (very distorted) EMI pickup at mains frequency.
If your internal function generator is based on a crystal oscillator, then it will be accurate. If, as I expect, it is not then its frequency will be suspect. Use your scope to compare it's output frequency accuracy with the mains using the lissajous figures X Y method; that does not guarantee frequency accuracy at other frequencies.
So, creating your own crystal oscillator and digital divider is probably the best route.
When the scope's horizontal is *10, then it is sweeping ten times faster (doh!), so only 10% of the electrons are hitting each spot. That will make it dimmer.
tunk:
--- Quote from: osmax_br on February 11, 2025, 01:15:48 am ---Well , guys I have a stupid question
My analog scope (os9020g 20mhz plus 1 mhz function generator) that I bought is out of calibration, it was in a humid storage environment for 30 years
HOW DO I CALIBRATE THIS THING WIITHOUT SEPARATE FUNCTION GENERATOR, I have the service manual
However I only have a dmm (cheap one) and this scope
My stupid question is : can I do a BASIC calibration using the built-in function gen, or it is a stupid idea
And if it is a stupid idea (most probably is) , what is the least expensive thing I can buy to calibrate this thing , should I just do a simple crystal oscillator circuit and call it a day?!!
Or just leave it as is since I might do more de-calibration than calibration with my not-good equipment
Also one more stupid question, when I push times 10 knob, the crt becomes very dim that I barly see a trace , any suggestions about the problem or a guess why it happened?
--- End quote ---
Please don't double-post, and this has nothing to do with the DSO510:
https://www.eevblog.com/forum/testgear/calibrating-analog-scope-with-minimal-equipment-only-built-in-generator/
osmax_br:
--- Quote from: tunk on February 11, 2025, 12:26:49 pm ---
--- Quote from: osmax_br on February 11, 2025, 01:15:48 am ---Well , guys I have a stupid question
My analog scope (os9020g 20mhz plus 1 mhz function generator) that I bought is out of calibration, it was in a humid storage environment for 30 years
HOW DO I CALIBRATE THIS THING WIITHOUT SEPARATE FUNCTION GENERATOR, I have the service manual
However I only have a dmm (cheap one) and this scope
My stupid question is : can I do a BASIC calibration using the built-in function gen, or it is a stupid idea
And if it is a stupid idea (most probably is) , what is the least expensive thing I can buy to calibrate this thing , should I just do a simple crystal oscillator circuit and call it a day?!!
Or just leave it as is since I might do more de-calibration than calibration with my not-good equipment
Also one more stupid question, when I push times 10 knob, the crt becomes very dim that I barly see a trace , any suggestions about the problem or a guess why it happened?
--- End quote ---
Please don't double-post, and this has nothing to do with the DSO510:
https://www.eevblog.com/forum/testgear/calibrating-analog-scope-with-minimal-equipment-only-built-in-generator/
--- End quote ---
Got it boss , sorry for the inconvenience I made
I am kinda new to the forums
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