Iyakokin daɗi na ƙarfin birnin oscilloscope

Matsayin Yawan Bandwidth

Kamar idan mutanen fura, oscilloscopes na nufin karamin abubuwa masu muhimmanci don samun fahimtar circuits. Amma akwai matsayin da suke da su. Don haka, yana da kyau a samun waɗannan matsayin kuma tuntubi masu lalacewar su.

Wani muhimman siffofin oscilloscope shine bandwidth. Bandwidth ya ba da shawarar da za a iya samun alama mai sauƙi. Me ke nufin bandwidth? Abubuwan mutane suna yi wani takam da zai iya samun frequency ta rikicin scope. Bisa ga haka, bandwidth shine frequency inda amfani kan alaman signal ya rage 3dB, ko 29.3% ciki har zuwa amfani kan alama.

A cikin frequency ta rikicin an samu, oscilloscope ya baka 70.7% daga amfani kan alaman halaye. Misali, idan amfani kan alama ce 5V, za a baka ita a cikin scope kamar 3.5V.

Oscilloscopes da suka da bandwidth 1 GHz ko kadan ne suka da response mai Gaussian ko low-pass, tun daga babban tashar -3 dB kuma ya rage shiga ciki a frequencies masu yawa.

Scopes da suka da specification da ya fi 1 GHz suka da response mai flat da rage shiga ciki a tashar -3dB. Frequency na tafin da input signal ya rage 3 dB shine bandwidth ta scope. Oscilloscope da response mai flat yana iya rage in-band signals da suka da biyu ciki saboda oscilloscope da response mai Gaussian kuma yana iya yi measurements da ingantaccen daidaito a in-band signals.

Daga baya, scope da response mai Gaussian ya rage out-bands signals da suka da biyu ciki saboda scope da response mai flat. Yana nufin haka cewa scope wuce yana da rise time da ya fi yawa saboda scopes masu same bandwidth specification. Rise time specification ta scope yana da shawarar da bandwidth.

Oscilloscope da response mai Gaussian yana da rise time kamar 0.35/f BW kamar 10% zuwa 90% criterion. Scope da response mai flat yana da rise time kamar 0.4/f BW kamar sharpness of the frequency roll-off characteristic.

Rise time shine speed mafi yawan edge da oscilloscope zai iya baka idan input signal yana da rise time mai tsarki. Idan ban iya samun wannan value mai tsarki, yana da kyau a kula value mai gaskiya

Abubuwan Da Za A Yi Don Samun Measurements Da Ingantaccen Daidaito a Oscilloscope

Wani abu da masu amfani da scope suke son sanin bandwidth limitation ta scope. Bandwidth ta oscilloscope yana da kyau a zama tafiyar da za a iya jagoranci frequencies a cikin signal kuma baka waveform daidai.

Probe da ake amfani da scope yana da muhimmanci a kan performance ta equipment. Bandwidth ta oscilloscope da probe da kuma yana da kyau a zama combination daidai. Amfani da oscilloscope probe da ba daidai ba zai iya kasance performance ta duka test equipment.

Don samun frequency da kuma amplitude daidai, bandwidth ta scope da probe da ake amfani da shi yana da kyau a zama tafiyar da signal da kake so ku fada. Misali, idan accuracy ta amplitude ce ~1%, maka rate ta scope bayan 0.1x, yana nufin 100MHz scope zai iya fada 10MHz da 1% error a amplitude.

Yana da kyau a duba triggering ta scope daidai cewa view ta waveform ya zama daidai.

Masu amfani da scope suke son sanin ground clips a lokacin da suke samun measurements mai sauƙi. Wire ta clip yana produce inductance da kuma ringing a cikin circuit wanda ke kusa samun measurements.

Gistin rubutun shine cewa don analog scope, bandwidth ta scope yana da kyau a zama uku daga frequency mafi yawa ta system. Don digital application, bandwidth ta scope yana da kyau a zama arba daga clock rate mafi yawa ta system.