Synchronized sweep Oscilloscope history

-


oscilloscope synchronized sweep. hor. selector sets horizontal frequency range (the capacitor); freq. vernier adjusts free-running frequency; sync. amplitude sets gain comparator.


early oscilloscopes used synchronized sawtooth waveform generator provide time axis. sawtooth made charging capacitor relatively constant current; create rising voltage. rising voltage fed horizontal deflection plates create sweep. rising voltage fed comparator; when capacitor reached level, capacitor discharged, trace return left, , capacitor (and sweep) start traverse. operator adjust charging current sawtooth generator have longer period multiple of vertical axis signal. example, when looking @ 1 khz sinewave (1 ms period), operator might adjust horizontal frequency little bit more 5 ms. when input signal absent, sweep free run @ frequency.


if input signal present, resulting display not stable @ horizontal sweep s free-running frequency because not submultiple of input (vertical axis) signal. fix that, sweep generator synchronized adding scaled version of input signal sweep generator s comparator. added signal cause comparator trip little earlier , synchronize input signal. operator adjust synch level; designs, operator choose polarity. sweep generator turn off (known blanking) beam during retrace.


the resulting horizontal sweep speed uncalibrated because sweep rate adjusted changing slope of sawtooth generator. time per division on display depended upon sweep s free-running frequency , horizontal gain control.


a synchronized sweep oscilloscope not display non-periodic signal because not synchronize sweep generator signal. horizontal circuits ac-coupled








Comments

Post a Comment

Popular posts from this blog

Mobility.2C training and insignia Impi

-
zulu warrior in full regimental regalia, carrying large isihlangu war shield. c. 1860. upper body covered in cow tails, kilt of spotted cat, genet or civet skin , shins decorated cowtails. elaborate headdress consists of browband , face-framing flaps of leopard skin band of otter skin above. there multiple ostrich feather plumes , single upright crane s feather. shaka discarded sandals enable warriors run faster. move unpopular, objected killed, practice concentrated minds of remaining personnel. zulu tradition indicates shaka hardened feet of troops having them stamp thorny tree , bush branches flat. shaka drilled troops frequently, implementing forced marches covering more fifty miles day. drilled troops carry out encirclement tactics (see below). such mobility gave zulu significant impact in local region , beyond. upkeep of regimental system , training seems have continued after shaka s death, although zulu defeats boers, , growing encroachment british colonists, sharply curtailed r...
Read more

11th century parish church of St Leonard Hythe, Kent

-
st. leonard s church shelf containing skulls in ambulatory below chancel, commonly inaccurately described crypt. the large 11th century church hill; tower @ eastern end destroyed earth tremor in 1739 , restored in 1750. chancel, 1220, covers processional ossuary (a bone store, more commonly found on continent) lined 2,000 skulls , 8,000 thigh bones. date medieval period, having been stored after removal, make way new graves. common in england, bones dispersed, , rare collection. several of skulls show marks of trepanning. 1 of 2 surviving ossuaries in england; other in holy trinity church in rothwell, northamptonshire. other curiosities worth looking for. on pillars on south side of nave medieval graffiti depicting ships. vestry door, on north side of nave, unlocked; open see fine norman doorway. has been suggested this, in late medieval times apparently on outer wall of church, once internal wall, earlier norman church stage higher hill. make existing chapel of st edmund (or north tra...
Read more

Expenses controversy Ian Gibson (politician)

-
in may 2009, gibson became embroiled in mps expenses scandal detailed daily telegraph, reported claimed flat in daughter lived rent-free before selling half market value. subsequently, barred standing in next general election disciplinary panel of labour party. believing after panel s decision position untenable , resigned mp (by traditional procedural device of becoming crown steward , bailiff of 3 chiltern hundreds of stoke, desborough , burnham), thereby forcing by-election. resultant by-election won chloe smith, conservative party candidate, majority of 7,348, reversing previous labour majority of 5,459.
Read more