313 Triggering

The trigger unit comprises the following circuits a trigger pre-amplifier, a differential amplifier, trigger mode selector and a trigger-pulse shaper. The circuit diagram shows all triggering push-buttons in their released positions. 3.1.3.1. Trigger pre-amplifier for internal triggering If Y push-button SK4 is depressed, trigger pick-off stage TS64 in the Y channel and transistor TS402 form together an amplifier with series and shunt feedback. Y push-button SK4 is only a mechanical release for...

326 Timebase Generator And Horizontal Amplifier

Note For adjustment of the stability (R553) se6point 3.2.3.1. 3.2.6.1. Time coefficients (R534, R539, R618) Depress YA switch SK4, + switch SK8, AUTO switch SK10, X MAGN switch SK1 and BEAM SELECTOR switch A SK14. Set TIME div potentiometer R4 to CAL. Set LEVEL potentiometer R3 to its mid-position. Set TIME div switch SK2 to .5 ms. Check that the length of the time-base is 10 to 10,5 div, if necessary, readjust potentiometer R618 (Fig. 3.17.). Set TIME div switch SK2 to 20 jus. Apply a time...

315 Horizontal Amplifier

In the time positions of TIME div switch SK2 the sawtooth voltage of the time-base generator is fed to the base of transistor TS603. The sawtooth is also applied, for external purposes, to TB OUT socket BU6 via emitter follower TS516. In position X via Y of TIME div switch SK2, the external X deflection voltage applied to the Y channel is fed from transistor TS64 to the base of transistor TS603, via emitter follower TS75 and amplifier TS602. The external X deflection voltage is also applied to...

Transformer

Mains transformer TS801 has three primary windings (SI, S1' and S1) which, together with the secondary winding (S2), can be combined by means of voltage adapter SK21. This combination allows the instrument to be used with mains voltages of 110 V, 127 V, 220 V and 240 V. The voltage on secondary winding is full-wave rectified. The resulting negative d.c. voltage, or alternatively a negative d.c. voltage on EXT DC SUPPLY input socket BU8, is applied to the voltage stabilizer and converter. Part...

Location Of Components

Items 25 399 on A and B vertical amplifier unit Items 400 799 on Time-base unit Items 800 850 on Power supply unit and CRT.adjusment unit, except TS813 Items 900 1025 on Delay line unit Circuits formed by TS808.80a811.8l2.8U.816 on CRT adjustment unit Circuits formed by IC 1001.1002,1003 and 1023.1024 on storage unit Circuits formed by TS1026.1027.1028.1029.1031 on brightness control unit

314 Timebase Generator

Trigger Time Base Generator

The time-base generator comprises a sweep-gating multivibrator, a sawtooth generator, a hold-off circuit and an auto circuit. 3.1.4.1. Sweep-gating multivibrator and sawtooth generator, single and erase functions The sweep-gating multivibrator comprises transistors TS503 and TS504 in Schmitt-trigger configuration. In the state transistor TS503 cut off and transistor TS504 conducting, transistor TS509 is cut off. Then the time-base capacitor selected with TIME div switch SK2 is charged with a...

3311 Cathoderay Tube

Philips 3311

Attention Be very careful with the side connections of the c.r.t. If these pins are bent, the c.r.t. is likely to develop a gas leak. Slacken the brace around the c.r.t. neck by means of screw F. Remove magnets T and pull the yoke Y from the c.r.t. neck. Slacken the four screws H and remove the plates. Remove the rrtli-metal screening tube S. Remove the bezel with graticule, filter and mask. Remove the rubber collar around the front side of the c.r.t. Push the c.r.t. to the rear side of the...

324 Vertical Amplifiers

- The adjustments of the vertical amplifier channels YA and Yg are identical. The knobs, sockets and adjusting elements of channel Yg are shown in brackets after those of channel YA. - Unless otherwise stated the controls always occupy the same position as in the previous check. - Adjust INTENS control R8 for adequate display brightness. - Rotate potentiometer PERSISTENCE R10 entirely anti-clockwise. - Depress YA Yg switch SK4 SK5 , switch SK8 and BEAM SELECTOR switch A SK14 B SK15 . - Set...

Info

Philips 3234

Der 10-MHz-Zweistrahl-Speicher Oszillograf PM 3234 ist f r allgemeine Laborarbeiten, den Service und f r Unterrichtszwecke vorgesehen. Beide Y-Verst rker besitzen eine Verz gerungsleitung und eine driftarme und voll berlastungsgesch tzte Eingangsschaltung mit Feldeffekttransistoren. Alle Schaltungen sind voll transistorisiert. Die Transistoren stecken in Fassungen, damit sie n tigenfalls schnell ersetzt werden k nnen. Der Oszillograf kann mit Netzwechselspannung oder einer externen...

Ma9006

Crt Storage Flood Gun

The storage circuit, located on the storage unit, supplies voltage levels and timing pulses to control the storage part of the C.R.T. in the SAVE, READ, ERASE and WRITE modes and in the positions PERSISTENCE and MAX. WRITE. The storage circuit will be discussed with the aid of the simplified diagram of this circuit as shown in Fig. 3.12. The schematic of this circuit is on the diagram Fig. 3.51. at the rear of the manual. The WRITE mode is operative after depressing push-button SK25. Assume...

213 Anschluss An Eine Externe Gleichspannungsquelle

Gleichspannungsquelle

Das Ger t kann an eine externe Gleichspannung von 22 bis 30 V angeschlossen werden die Stromaufnahme betr gt 1,25 A. Diese Spannung ist an Buchse BU8 EXT. D.C. SUPPLY anzuschliessen. DER PLUSPOL DER SPANNUNG IST MIT ERDE ZU VERBINDEN WIE ES IN DEM SCHALTBILD AN DER HINTEREN TEXTPLATTE ZU SEHEN IST, DA DER PLUSPOL DER STROMVERSORGUNG MIT DEM CHASSIS VERBUNDEN IST. Bei einer falschen Polung der Spannungsquelle wird der Oszillograf nicht besch digt. Beim Betrieb an einer externen Gleichspannung...

Mas9

Storage-mesh potential during variable persistence mode b. Corresponding storage-layer surface potential containing information c. Same as b. but persistence adjustment shorter bigger pulse width 3.1.6.9. Automatic brightness control unit The A.B.C. unit is a circuit which controls the trace brilliance by means of the following devices. The ratio between sweep time and combination sweep time hold-off time in the following text this ratio will be called duty cycle . If this ratio...

222 Grundeinstellungen

Wir empfehlen das Ger t 5 Minuten vor Beginn der Messungen einzuschalten. Diese Vorw rmzeit gen gt allerdings nicht, wenn das Ger t aus einem kalten Raum kommt und erst akklimatisiert werden muss siehe auch Abschnitt 2.1.6. . Pr fen ob der Netzspannungsumschalter auf die vorhandene Netzspannung eingestellt ist. Falls erforderlich den Umschalter f r die entsprechende Spannung einstellen, wie in Abschnitt 2.1.2. angegeben. Das Ger t einschalten. Bei externer Gleichspannung. Pr fen ob die externe...

31 Circuit description

Input Attenuator Pm3234

CHANNEL YA VERTICAL AMPLIFIER 3.1.1.1. General The vertical amplifier provides control of the input coupling, Y deflection coefficient and gain. Furthermore, a drift-reduction circuit, a delay line and a trigger pick-off stage are part of the amplifier circuitry. Fig. 3.1. Vertical amplifier, channel Y Fig. 3.1. Vertical amplifier, channel Y Input signals connected to YA socket BU3 can be a.c. coupled, d.c. coupled or internally disconnected. In position DC of AC-O-DC switch SK16, the...

343 Remark

Philips Oscilloscope Pm3234

In case of a defect is always possible to apply to the world wide PHILIPS Service Organization. When the instrument is to be sent to a PHILIPS Service Workshop for repair, the following points should be Attach a label with your name and address to the instrument. Give a complete description of the faults found. Use the original packing, or, if this is no longer available, carefully pack the instrument in a wooden crate or box. Send the instrument to the address obtained after consultation with...

U

Der PM 3234 Oszillograf enth lt eine Elektronenstrahlr hre mit einem Speichernetz mit variabler Speicherzeit. Daher kann die Elektronenstrahlr hre wie jede normale verwendet werden, jedoch mit ver nderlicher Nachleuchtdauer des dargestellten Signals. Information wird durch Schreiben des Signals des Hauptelektrodenstrahls auf eine SPEICHERSCHICHT aus nicht leitendem Material gespeichert. Als Folge der Sekund remission von Elektronen aus dieser Schicht wird ein positives Ladungsmuster aufgebaut....

71

Zweistrahl-Speicheroszillograf PM 3234 31 Abb. 2.1. R ckansicht mit Buchsen 36 Abb. 2.2. R ckansicht mit Sicherung VL 802 37 Abb. 2.3. Vorderansicht mit Bedienungsorganen und Buchsen 38 Abb. 2.4. Abb. 2.5. Vereinfachtes Schaltbild der Elektronenstrahlr hre 45 Abb. 2.6. Ausschnitt aus den Speicher- und Kollektornetzen 45 Abb. 2.7. Querschnitt des Speichersystems 45 Abb. 2.8. Speichersystem mit hohem Helligkeitsgrad 45 Abb. 2.9. Cut off des Speichersystems 45 Abb. 2.10. Blockschaltbild...