Gaskiya na Oscilloscope

Oscilloscopes suna daya daga cikin abubuwan da suke so in ba da su a fannin elektronika bayan multimeter. Bila haka, yana da wuya kawai don samun wani abu ya faru a kan circuit. Amma wannan irin tafiya tana da matsalolin da ke mutuwa. Don in iya gudanar da wannan matsaloli, yana bukata a duba shi daidai da kuma tabbatar da shi da kyau.
Muhimmanci a cikin muhimmanci na oscilloscope shine bandwidth. Yadda ya yi aiki a kan adadin sampalin analog per second da zan iya bincike ita ce muhimman abu ga oscilloscope. Ina jin magana muna, misali na bandwidth? Duk da cewa akwai masu sani suna yi amfani da maximum allowed frequency ta scope as bandwidth. Amma a halin haka, bandwidth na oscilloscope shine frequency inda sinusoidal input signal ita zai iya cutar da 3dB, wanda yake da 29.3% low na amplitude na signal.

Yana nufin cewa a kan maximum rated frequency point, amplitude da instrument ita ke nuna ita ce 70.7% na amplitude na sadarwa. Idan a maximum frequency, amplitude na sadarwa ita ce 5V amma zai nuna a kan skrin kamar ~3.5V.

Oscilloscope da specification 1 GHz bandwidth ko kadan ita na nuna Gaussian response ko low-pass frequency response wanda take da dukkan fasahar -3 dB a farkon da take karamin karamin a wasu frequencies.
Scopes da specification da ke da 1 GHz na nuna maximally flat response tare da sharp roll-off a kan -3dB frequency. Frequency da na da ita da input signal ita zai iya cutar da 3 dB shine bandwidth na scope. Oscilloscope da maximally flat response zai iya cutar da signals da ke da ita da kyau musamman da oscilloscope da Gaussian response da ke yi measurements da dabara.

Duk da cewa, scope da Gaussian response ita na cutar da out-bands signals da ke da ita da kyau musamman da scope da maximally flat response. Yana nufin cewa scope wanda yake da rise time da take da faɗi a matsayin bandwidth specification.
Gaussian response type oscilloscope zai iya da rise time kamar 0.35/f BW kafin a haɗe 10% zuwa 90%. Maximally flat response type scope zai iya da rise time kamar 0.4/f BW kafin a haɗe sharhiyar frequency roll-off characteristic.

Koƙari ina jin magana, rise time shine edge speed da ya fi saurari da scope ita za su iya faɗa idan input signal ita ta da theoretically infinitely fast rise time. Amma don in iya baƙar ta theoretical value ita da wani nasara, yana bukata a haɗe practical value.

Gagarumin Da Ya Yi Kyautar Sai Da Tabbacin Measurements a Kan Oscilloscope

1. Abu mai ban sha'awa wanda masu amfani su ke bukata shine matsalolin bandwidth na scope. Bandwidth na oscilloscope ya kamata ya fi da ita da tsawon frequencies a kan signal da kuma tushen waveform daidai.

2. Probe da ake amfani a kan scope yana da rawa wajen performance na tafiya. Bandwidth na oscilloscope da probe ita ya kamata ya fi da ita da gyara daidai. Amfani da oscilloscope probe da ba daidai ba zai iya gudanar da performance na duk tafiya.

3. Don in iya bincike frequency da kuma amplitude da dabara, bandwidth na scope da probe da ake kafa ita ya kamata ya fi da ita da tsawon signal da kake son in ka ƙirƙira. Misali, idan accuracy required amplitude ita ce ~1%, akwai karfin scope by 0.1x, wanda yana nufin 100MHz scope zai iya ƙirƙira 10MHz ta 1% error a amplitude.

4. Yana bukata a duba triggering na scope daidai don in iya samun view daidai na waveform.

5. Masu amfani su ke bukata game da ground clips a lokacin da suke ƙirƙira high-speed measurements. Wire na clip ita ke produce inductance da ringing a cikin circuit wanda ke iya gudanar da measurements.

6. Muhimmiyar takaitaccen article shine cewa don analog scope, bandwidth na scope ya kamata ya fi da ita da uku tsawon highest analog frequency na system. Don digital application, bandwidth na scope ya kamata ya fi da ita da baya tsawon fastest clock rate na system.

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