Gould OS4000 电路图.pdf

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1、DIGITAL STORAGE OCILLOSCOPE 054000 Instruction Manual -GOULD Telephone 01-5001000 Telegrams AttenuateIlford Telex 263785 RadioFans.CN 收音机爱 好者资料库 Contents SECTION1Introduction4ILLUSTRATIONS Fig.1Alias Effects10 SECTION2Specification5Fig.2Block Diagram of Instrument12 Fig.3Block Diagram of ADC16 SECTI

2、ON3OperatingInstructions6Fig.4TypicalSignal Waveforms(ADC)17 3.1Supplies6Fig.5TimingSignal Waveforms(ADC)18 3.2C.R.T. Controls6Fig.6TimingChart (ADC)19 3.3Y Channel Controls6Fig.7Logic Block Diagram: 3.4Timebase Controls6Refreshed Mode20 3.5Store Controls7Fig.8Tim ing Diagram:Refreshed 3.6Alias Effe

3、cts8Mode21 3.7AdditionalFacil ities9Fig.9Tim ing Diagram:Address 3.8FunctionalChecks9Sequence22 Fig. 10Logic Block Diagram:Roll Mode 23 SECTION4CIRCUITDESCRIPTION12Fig. 11TimingDiagram:Roll Mode24 4.1SystemDescription12Fig. 12SimplifiedControlLogic28 4.2Power Supplies13Fig. 13Timebase Block Diagram:

4、 4.3Y Amplifier14NormalMode30 4.4Analogue-DigitalConverter16Fig. 14BottomView37 4.5Store and ControlLogic20Fig. 15RighthandView37 4.6Mode Control27Fig. 16RighthandView:Maintenance 4.7Trigger and Timebase30Position38 4.8D-A Converterand Dot Joiner34Fig. 17ControlConditionTable40 4.9Calibrator35Fig. 1

5、8Data Faults50 Fig. 19ADC Waveforms51 SECTION5Maintenance36Fig. 20CircuitDiagram:Power Supplies, 5.1General36Y Outputand Blanking57 5.2MechanicalAssembly36Fig. 21CircuitDiagram:Pre-amplifiers59 5.3Fault Finding39Fig. 22CircuitDiagram:A-D Converter63 5.4CalibrationProcedure52Fig. 23CircuitDiagram:Tim

6、ingand 5.5Wiring details for l00Voperation52Store Logic69 Fig. 24CircuitDiagram:Timebase71 SECTION6CircuitDiagrams and Fig. 25CircuitDiagram:D-A Converter ComponentSchedules55 and Dot Joiner73 SECTION7Guarantee and Service Facilities79 Fig. 26InterconnectionDiagram75 Fig. 27MechanicalViews 77 RadioF

7、ans.CN 收音机爱 好者资料库 The Gould Advance OS4000 Digital Storage Oscilloscope is a versatile instrumentwhich combines conventional lOMHz oscilloscope performancewith a digital storage system, capable of storing signals up to 450kHz.The digital method of storage offers several advantages over the more comm

8、on tube storage, notably the facility of pre-trigger viewing, the simultaneousviewing of a stored and a real-time display, absence of deteriorationof the stored display with time, completelyflicker free, low frequency performance,and the abolition of the very expensive storage tube. Careful attentio

9、nto the ergonomic design allows the OS4000 to be operated in the same way as a conventional Section 1 oscilloscope with the addition of the minimum number of additional controls for the storage functions. APPLICATIONS The OS4000 isideally suited for viewing: 1. Transient waveforms, e.g. in Medical,

10、dynamic testing, vibration, pulse testing application. 2. All LF applications where the Refresh mode eliminates flicker.The slowest sweep speed of 200s maximum allows the instrumentto be used for new classes of viewing application. 3. Normal (real time) viewing with the 10MHz real time performance.

11、4. Comparisons between stored and real time waveforms. RadioFans.CN 收音机爱 好者资料库 Specification DISPLAY 8 x 10 cm rectangular CRT operating at 4kV Illuminatedgraticule VERTICAL DEFLECTION Two identical input channels Bandwidth:DC-lOMHz in the Normal mode Sensitivity:5mV/cm to 20V/cm in 12 ranges Uncali

12、bratedfine gain control gives between range sensitivity adjustment Accuracy: 3% in calibrated positions Input Impedance:IM/28pF Input Coupling:AC-GND-DC Maximum Input:400V DC or pk AC HORIZONTAL DEFLECTION Timebase:Ills/cm to 20 sec/cm in 23 rangesJ-Jkb . +XJOt.siA$a Accuracy.- 3%IMCcrcc;I SIVVC/L.

13、X Expansion:Continuouslyvariable from IX to 10X with calibrated stops at each end TRIGGER Source:CHl, CH2, Ext, or line Coupling:AC, LF Rej., HF Rej, DC Sensitivity:Internal 2mm approx., DC-2MHz (lcm at 10MHz) External IV approx. DC-2MHz (5Vat10MHz) Bright Line:Available on normal operationonly DISP

14、LAY VIA STORE Store size:1024 x 8 bits Vertical Resolution:Approx. 200 for 8cm display, Le. 25 steps per(;m HORIZONTALRESOLUTION Single Trace:Approx. 1000 samples for complete scan (lOO samples/cm) Double TraceApprox. 500 samples for complete scan or Alt. Lock:(50 samples/cm) Maximum Sample Rate:1.8

15、MHz(0.55Ils) Section 2 FASTEST RISE TIME For step response:0.551lssingle trace I.Ills dual trace or Alt. Lock (EquivalentBandwidth 600kHz and 300kHz) Maximum Storage450kHz single trace Frequency - 3 db:225kHz dual trace or Alt. Lock Limited Store:For timebase speeds faster than SOils/cmthe number of

16、 samples per cm is reduced in proportionto the sweep rate. For speeds slower than SOils/cmthe maximum stored bandwidth is reduced in proportionto the sweep rate Dot Joining:The expanded display appears as straight lines joining consecutive samples rather than as distinct dots ACCESSORIES SUPPLIED Ha

17、ndbook PN 36240 2 x Lead PL44BNC-clip 2 x Lead PL43BNC-BNC Supplies:Il5V,220V, 240V 10% 45-400Hz,55W Size:17.8 x 31.2 x 41.7 (7 x 12% x 16*) Weight:Approx. 11 kg (24% Ib) TemperatureRange:Operating 0 to 50C Full spec. 15 to 35C OPTION 4001 This add-on option provides analogue outputs to allow the tr

18、ace to be recorded on strip chart, X Y or T Y recorders and digital outputs for further processing of the recorded data.(See data sheet.) Operation 3.1SUPPLI ES The instrumentis normally despatchedfrom the factory with the supply range switch on the rear panel set to the 240V(10%) range. Check that

19、this is set correctly before connecting to the supply.Note that the correct fuse for the two high voltage ranges, 220V and 240V, is 500mA Slo-Blo (20mm) Advance Part No. 33685.If the 115V range is selected the fuse should be changed to a lA Slo-Blo Advance Part No. 34790. NOTE: DO NOT CHANGE THE SUP

20、PLY RANGE SWITCH WITH THE INSTRUMENT CONNECTED TO THE SUPPLY. While the instrumentdoes not rely on forced air circulation,it should not be operated at elevated temperaturesif the natural connectioncooling is restricted,particularlyat the rear of the instrument. The instrumentis switched on by pressi

21、ng the POWER buttonwhen the associated neon indicator should light. The buttonis self locking and the instrumentis switched off by pressing the buttonagam. 3.2C.R.T. CONTROLS These controls are grouped to the right of the c.r.t. display. IntensityThis is used to set optimum trace intensity depending

22、 on ambient lighting conditions. FocusUsed to obtain finest possible trace width. ScaleThe un-illuminatedgraticule is easily visible under normal lighting conditions.Graticule illuminationis usually only reqUired under low ambient light conditionsor when photo- graphically recording the display.The

23、intensity will depend on the film speed, aperture and exposure time being used. The graticule has 0, 10, 90,100%lines marked to assist in rise time measurement. 3.3Y CHANNELCONTROLS These controls are grouped beneath the c.r.t. display. The input signal is applied to the CHI or CH2 BNC input socket.

24、 Coupling For direct connectionof the input signal, set the associated AC-Ground-DC input iever switch to DC. For capacitive coupling of the input signal through an internal O.lpF 400V capacitor, set the lever switch to AC. NOTE: When examining low amplitude a.c. signals super- imposed on.a high d.c

25、. level, the lever switch should be set to AC and the sensitivity of the Y amplifier increased. To locate the baseline, set the lever switch to the ground setting.At this setting, the input signal is open circuit and the input of the amplifier is switched to ground. Section 3 Sensitivity Set the VOL

26、TS/CM switch to a suitable setting.To minimise pick up at sensitive settings, it is essential to ensure that the ground lead connectionis near to the signal point. If necessary, adjust the concentric VARIABLE control. NOTE: The range of the VARIABLE control is approximately 3.1 so that its.full adju

27、stmentoverlaps the adjacent lower sensitivity range.Except at the CAL setting, the VARIABLE control is uncalibrated.At the CAL setting, the calibration corresponds to the setting of the VOLTS/ CM switch. Shift For vertical shift of the trace, adjust the Y shift controls (identified with vertical arr

28、ows). Ba!. The preset balance should be adjusted to minimise verticle movement of the CHI or CH2 traces when the inputs are grounded and the attenuatorswitch is moved between the 0.5V/cm position and the 0.2V/cm position: This should only be done after a reasonable warm up time of say 15 minutes and

29、 should only require infrequentadjustmentthereafter. Y Mode This three position switch allows single channel display of the selected channel CHI or CH2, or dual channel display when CHI CHI and CH2 attenuatorsto 0.2V/cm; Trigger Lever Control knob pushed in; CHI, CH2 and X shift controls central; Y

30、Mode switch to CHI Input coupling switches to GND; Trigger source switch to CHI; Trigger Coupling to A.C. Turn Intensity control to clockwise end.Adjust CHI and CH2 shift controls to obtain two traces.Adjust Intensity and Focus control to obtain finest possible traces. Rotation of the Trigger Level

31、control through the central position will cause trigger L.E.D. to flash once. After about 15 mins. warm up, check that on both channels the vertical trace movement caused by turning the attenuatorswitches from 0.2V/cm to 0.5V/cm is less than 0.5cm.If not adjust the BAL. pre-set for that channel.Set

32、input coupling switch to DC. Apply sine wave at approx. 1kHz to CHI and select CHI as trigger source.Adjust CHI attenuatorand/or signal amplitude to give about 5cm Y deflection.Adjust level control to obtain stationarytrace - check trigger L.E.D. is illuminated.Pull out Trigger level control to disa

33、ble Bright Line facility and turn until trigger is lost; trace should disappear.Trace should re-appear free running when Level control is pushed in. Reset Level control for stationarytrace. Operation TRACE A INPUT TRACE B SAMPLE RATE TRACE C TRACE o SAMPL.E RATE TRACE E SAMPLE RATE Section 3 Operati

34、on Refreshed Mode Apply approx. 1kHz with the timebase on the O.5ms/cm range. Obtain a stable display.Switch the Display mode to Refreshed.The Display is now being obtained from the store.Removal of the signal by disconnectingthe input or switching the input coupling switch to the CND will cause the

35、 last sweep to be preserved in the store and displayed indefinitely.This sweep may include the break of signal. Apply a 1 to 10Hz sine wave and adjust the timebase range switch accordingly.Adjust the level control to light the trigger L.E.D.The refreshing sweeps through the store can be clearly seen

36、 as the time base range is switched up or down. Store If the signal is removed and the Store buttonpressed, on re-applying the signal the sequence-trigger-storecan be followed by watching the status indicators, and the store will have been completelyupdated when the store L.E.D. is lit. The sequence

37、 may be repeated by pressing the Store buttonagain. Lock Full Store Select CHI only, with CHI as trigger source.Apply approximately1kHz signal and adjust the Trigger Level so that refreshing sweeps are occuring.Push Store buttonand when the store L.E.D. is lit, push the Lock Full Store button.On ret

38、urning the Display mode switch to the normal position, conventionaloscilloscope operation is possible - Le. the input attenuatorsand timebase range can be altered, another signal can be observed, but on returning the mode switch to the Refreshed position, the original stored display will be obtained

39、, irrespective of the current input and setting of the sensitivity and sweep speed controls(SOils/cmor slower).Release the Lock button. Lock Alt. Samples With the display mode switch in the refreshed position again, apply the same signal as before and adjust trigger level to obtained refresh sweeps.

40、 Store the trace then press the Lock Alt. Samples button.On returning to the refreshed mode (pushing Release button)it will be found that operating the CHI shift control, results in two traces being generated - one which responds to the input signal, shift, attenuatorand timebase controls, the other

41、 a fixed display of the original store contents.On uplatching the Lock ALT. Samples buttona single trace is again displayed. Section 3 Select CHI the 1024 available store locations represent approximately11.3 cms. of trace length, thus there are 91 samples per cm. A data entry rate of 0.91 MHz would

42、 correspondto 100Ils/cm. and 91 Hz to Is/cm. and so on. The data entry rate is determinedby a programmable digital divider controlledby the timebase range switch. This divider operates on the basic clock frequencyof 1.82MHz which correspondsto SOils/cm, the fastest sweep rate available in the digita

43、l mode. Dual trace operationin the REFRESH mode is catered for by operating the beamswitch in the chop mode at half the data entry rate, thereby storing samples of each trace in alternate store locations.Since the store is being read out at a relatively fast rate, however, the alternate sweep techni

44、que is used during read out, with store Circuit Description locations relevant to one trace being read out on one sweep, and the remaining location on the next sweep. The STORE control provides a conventionalsingle shot facility to enter one triggered sweep of data into the store, while the LOCK STO

45、RE controls inhibit immediately the entry of any new data. The ROLL mode of operationis similar to the REFRESHED mode except in the way in which new data is entered into the store.Instead of waiting for a trigger pulse to initiate a new data input cycle, data is continuouslyentered into the store.Th

46、us, if data entry is made to stop on receipt of a trigger pulse, the contents of the store will be informationstored before the trigger pulse, rather than after it as in a conventionaltrigger sequence.To expand this facility, which operates only in conjunctionwith the single shot store controls, a s

47、witched delay is incorporatedmarked STORED TRIGGER POINT which allows the input of new data to continue after a trigger is received, for a time corres- ponding to , or%of the store length.This allows the amount of pre-trigger and post trigger information retained in the store to be varied to suit th

48、e application. Circuit References Each componentin the instrumentis specified by a circuit reference consisting of a letter prefix and a number.The number also indicates which printed circuit board assembly the componentis mountedon as shown below:- Circuit Reference No. o -99Main Frame Components 1

49、00 - 399Analogue to Digital Converter Assembly E.H.T. Board Power Supply Board Store Logic Board Timing Logic Board Output Unit 4001 - Fitted as an option.See separate handbook for details. 900 -1099Timebase Board. The location of the various assemblies is shown in Figs.14, 15 and 16. 400 - 499 500 - 599 600 -699 700 - 799 800 - 899 4.2.1GENERAL Referring to Fig.20 all the power supplies for the instrumentare derived from the transformer,TS1. Two tapped primary windings are switched by SS2 to allow for three supply voltage ranges and fuse FSS1 provides fault protection.The supply indi