HP-1744A-Manual 电路图.pdf

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1、 HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! On-line curator: Georg zur Horst-Meyer RadioFans.CN 收音机爱 好者资料库 le OPERATORS GUIDE 1744A OSCILLOSCOPE HEWLETT PACKARD RadioFans.CN 收音机爱 好者资料库 SAFETY SUMMARY The following general safet

2、y precautions must be observed during operation of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assumes no liability for the c

3、ustomers failure to comply with these requirements. GROUND THE INSTRUMENT. To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. The instrument is equipped with a three-conductor ac power cable. The power cable must either be plugged into an approved

4、 three-contact outlet or used with a three-contact to two-contact adapter with the grounding wire (green) firmly connected to an electrical ground (safety ground) at the power outlet. The power jack and mating plug of the power cable meet International Electrotechnical Commission (IEC) safety standa

5、rds. DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE. Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard. DO NOT REMOVE INSTRUMENT COVERS. Operating personnel must not remove instrume

6、nt covers. Component replacement and internal adjustments must be made by qualified maintenance personnel.Service instructions for this instrument are provided in a separate Operating and Service Manual. DANGEROUS PROCEDURE WARNINGS. Warnings such as the example below, precede potentially dangerous

7、procedures throughout this manual! Instructions contained in the warnings must be followed. WARNING Dangerous voltages, capable of causing death, are present in this instrument. Use extreme caution when handling, installing or operating. RadioFans.CN 收音机爱 好者资料库 ii OPERATORS GUIDE MODEL 1744A OSCILLO

8、SCOPE COPYRIGHT HEWLETT-PACKARD COMPANY/COLORADO SPRINGS DIVISION 1978 1900 GARDEN OF THE GODS ROAD, COLORADO SPRINGS, COLORADO, U.S.A. ALL RIGHTS RESERVED Operators Guide Part Number 01744-90902 Microfiche Part Number 01744-90802 PRINTED: AUGUST 1978 Table of Contents Model 1744A TABLE OF CONTENTS

9、Page GeneralInformation . 1 Description. 1 AccessoriesFurnished . 8 Accessories and Options Available . 8 Preparationfor Use . 8 PowerCord . 8 PowerRequirements . 9 Controlsand Connectors . 10 Turn-on Procedure . 18 Checking Instrument Performance . TraceAlignment . Astigmatismand Focus . ProbeCompe

10、nsation . VerticalAccuracy Check. SweepTime Accuracy . TriggerSelection Table . ObtainingBasic Displays . NormalSweep Display . MagnifiedSweep Display . DelayedSweep Display . MixedSweep Display . X-Y Display . Variable Persistance - Storage Operation. AutoErase . AutoStore Mode. ContinuousScan . Pa

11、ge EliminatingFlicker . 29 Storinga Trace . 30 Display Brightness Control . 30 MeasurementTechniques . 31 Introduction. 31 VoltageMeasurements . 31 Absolute Voltage Measurements . 32 Peak-to-peak Voltage Measurements . 33 Average Voltage Measurements . 34 Amplitude Comparison Measurements . 35 Metho

12、d1 . 35 Method2 . 36 CommonMode Rej ection . 36 Time-interval Measurements . 38 PeriodMeasurements . 38 Repetition Rate or Frequency Measurements . 38 Transition Time Measurements . 39 DelayedSweep . 40 Measuring Phase Difference by Time Delay . 43 Avs B Phase Measurements . 45 Triggering. 46 Trigge

13、rView . 46 Eliminating Multiple Triggering an ComplexWaveforms . 47 Measuring CRT Writing Speed . 48 19 19 20 20 21 21 21 21 21 23 24 25 25 26 26 26 28 11 Model 1744A Operators Guide MODEL 1744A OPERATORS GUIDE OPERATING INSTRUCTIONS GENERAL INFORMATION. This Operators Guide will acquaint you with t

14、he Model 1744A features, capabilities, accessories, power require- ments, and controls. To aid in operating the oscillo- scope, initial turn-on instructions, calibration proce- dures, and a performance check are provided. Detailed explanations in the Applications Section show how you can use varied

15、capabilities of the 1744A to best ad- vantage in a variety of electrical measurements. Speci- fiications and general characteristics for the 1744A are listed in tables 1 and 2. Service information is available in a separate service manual. DESCRIPTION. The Hewlett-Packard Model 1744A is a dual-chann

16、el, 100-MHz, delayed-sweep variable persistence storage oscilloscope designed for single-shot transients and low duty cycle waveform analysis in the bench or field environment. The writing speed specification of 1800 cm/s permits full screen capture of transients at the maximum slew rate of the vert

17、ical amplifier system. The dual-channel dc to 100 MHz vertical deflection system has 12 calibrated deflection factors from 5 mV/div to 20 V/div. A maximum sensitivity of 1 mV/div to 30 MHz is provided an both channels by means of a 5X vertical magnification feature. Selectable input impedance of 50

18、ohms or 1 megohm permits selection of that impedance which best meets measurement requirements. The hori- zontal deflection system has calibrated sweep rates from 2 s/div to 0.05 s/div and delayed sweep rates from 20 ms/div to 0.05 gs/div. A 10X magnifier expands all sweeps by a factor of 10 and ext

19、ends the fastest sweep to 5 ns/div. In alternate or chop modes, a trigger-view control will display three signals: the channel A signal, the channel B signal, and the trigger signal. This allows you to correlate time between the trigger signal and the channel A and channel B signals. In trigger-view

20、 operation, center screen represents the trigger threshold point, allowing you to see the triggering level location. With the A VS B control, an X-Y mode of operation is possible. The channel A input (Y-axis) is plotted versus the channel B input (X-axis). A trigger-view control provides capability

21、for observing the channel A signal, channel B signal, and an external Operators Guide Model 1744A Table 1. Specifications VERTICAL AMPLIFIERS (2) Bandwidth and Rise Time at all deflection factors from 0C to +55C. BANDWIDTH: 3 dB down from 6 div reference signal. DC-Coupled: dc to 100 MHz in both 50f

22、1 and 1 Mn input modes. AC-Coupled: approx 10 Hz to 100 MHz; 1 Hz with 10:1 divider probes. BANDWIDTH LIMIT: limits upper bandwidth to approx 20 MHz. RISE TIME: 3.5 ns, measured from 10% to 90% points of a 5 div input step. DEFLECTION FACTOR Ranges: 5 mV/div to 20 V/div (12 calibrated positions) in

23、1, 2, 5 sequence, accurate within 3%. Vernier: continuously variable between all ranges, extends maximum deflection factor to at least 50 V/div. UNCAL light indicates when vernier is not in CAL position. POLARITY: channel B may be inverted, front panel pushbutton. INPUT RC (selectable) AC or DC: 1 M

24、Ci 2% shunted by approx 20 pF. 50 Ohm: 50n 3%. MAXIMUM INPUT AC or DC: 250 V (dc + peak ac at 1 kHz or less) or 500 V (p-p ac at 1 kHz or less). 50 Ohms: 5 V rms. A+B OPERATION Amplifler: bandwidth and deflection factors are un- changed; channel B may be inverted for A-B opera- tion. Differential (A

25、-B) Common Mode: CMRR is at least 20 dB from dc to 20 MHz. Common mode signal ampli- tude equivalent to 6 divisions with one vernier adjusted for optimum rejection. VERTICAL MAGNIFICATION (X5) BANDWIDTH: 3 dB down from 6 div reference signal. DC-Coupled: dc to approx 30 MHz. AC-Coupled: approx 10 Hz

26、 to 30 MHz. RISE TIME: -12 ns (measured from 10% to 90% points of 5 div input step). DEFLECTION FACTOR: increases sensitivity of the 5 and 10 mV/div deflection factor settings by a factor of 5 for a maximum sensitivity of 1 mV an channels A and B. TRIGGER SOURCE Selectable from channel A, channel B,

27、 composite, or line frequency. CHANNEL A: all display modes triggered by channel A signal. Mode! 1744A Operators Guide Table 1. Specifications (Contd) CHANNEL B: all display modes triggered by channel B signal. COMPOSITE: all display modes triggered by displayed signal except in Chop. In Chop mode,

28、trigger signal is derived from channel A. LINE FREQUENCY: trigger signal is derived from power line frequency. TRIGGER VIEW Displays internal or external trigger signal. In Alter- nate or Chop mode, channel A, channel B, and the trigger signals are displayed. In Channel A or B mode, Trigger View ove

29、rrides that channel. Internal trigger signal amplitude approximates vertical sig- nal amplitude. External trigger signal deflection factor is approx 100 mV/div or 1 V/div in EXT =10. Triggering point is approx center screen. With id- entically timed signals to a vertical input and the external trigg

30、er input, trigger signal delay is 3.5 ns. MAIN AND DELAYED TIME BASES RANGES Main: 50 ns/div to 2 s/div (24 ranges) in 1, 2, 5 sequence. Delayed: 50 ns/div to 20 ms/div (18 ranges) in 1, 2 5 sequence. Accuracy: (over center 8 div) Sweep Time/Div*Accuracy 1 Temp Range X1X10 50 ns to 20 ms 3% 4% 0C to

31、 +15C 2% 3% +15C to +35C 3% 4% +35C to +55C 1 *Add 1% for 50 ms to 2 s ranges.1 MAIN SWEEP VERNIER: continuously variable be- tween all ranges, extends slowest sweep to at least 5 s/div. UNCAL light indicates when vernier is not in CAL position. MAGNIFIER (X10): expands all sweeps by a factor of 10,

32、 extends fastest sweep to 5 ns/div. CALIBRATED SWEEP DELAY DELAY TIME RANGE: 0.5 to 10 X Main Time/Div settings of 100 ns to 2 s (minimum delay 150 ns). DIFFERENTIAL TIME MEASUREMENT ACCURACY: *Accuracy Main Time Base Setting I(+15C to +35C) 100 ns/div to 20 ms/div (0.5% +0.1% of full scale) 50 ms/d

33、iv to 2 s/div (1% +0.1% of fll scale) *Add 1% from 0C to +15C and +35C to +55C. 3 Operators Guide Model 1744A Table 1. Specifications (Contd) DELAY JITTER: 0.002% (1 part in 50000) of maximum delay in each step from +15C to +35C; 0.005% (1 part in 20 000) from 0C to +15C and +35C to +55C. TRIGGERING

34、 INTERNAL: dc to 25 MHz on signals causing 0.3 division or more vertical deflection, increasing to 1 division of vertical deflection at 100 MHz in all display modes (required signal level is increased by 2 when in Chop mode and by 5 when X5 vertical magnifier is used). Triggering on Line frequency i

35、s also selectable. EXTERNAL: dc to 50 MHz on signals of 50 mV p-p or more increasing to 100 mV p-p at 100 MHz (required signal level is increased by 2 when in Chop mode). EXTERNAL INPUT RC: approx 1 Mfl shunted by ap- prox 20 pF. MAXIMUM EXTERNAL INPUT: 250 V (dc + peak ac at 1 kHz or less) or 500 V

36、 (p-p ac at 1 kHz or less). LEVEL and SLOPE Internal: at any point on the positive or negative slope of the displayed waveform. External: continuously variable from +1 V to -1 V on either slope of the trigger signal, +10 V to -10 V in divide by 10 mode (=10). COUPLING: AC, DC, LF REJ, or HF REJ. AC:

37、 attenuates signals below approx 20 Hz. LF Reject (Main Sweep): attenuates signals below approx 4 kHz. HF Reject (Main Sweep): attenuates signals above approx 4 kHz. CALIBRATED MIXED TIME BASE Dual time base in which the main time base drives the First portion of sweep and the delayed time base comp

38、letes the sweep at the faster delayed sweep. Also operates in single sweep mode. Accuracy, add 2% to main time base accuracy. A vs B OPERATION BANDWIDTH Channel A (Y-AXIS): same as channel A. Channel B (X-AXIS): dc to 5 MHz. DEFLECTION FACTOR: 5 mV/div to 20 V/div (12 calibrated positions) in 1, 2,

39、5 sequence. PHASE DIFFERENCE BETWEEN CHANNELS: ,1800 cm/s over center 6 x 8 div (with viewing hood). STORAGE TIME Display Mode: at least 10 s at 22C. Store Mode: at least 30 s at 22C. Wait Time: at least 60 s at 22C. ERASE TIME: approx 300 ms. GENERAL REAR PANEL OUTPUTS: main and delayed gates, +0.8

40、 V to +2.5 V capable of supplying approx 5 mA. AMPLITUDE CALIBRATOR (0C to +55C) Output Voltage 1 V p-p into -1 MSl 1% 0.1 V p-p into 50f1 Rise Time 10.1 s Frequency 1 approx 1.4 kHz POWER:100,120, 220, 240 Vac, 10%, 48 to 440 Hz;100 VA max. WEIGHT: net, 13.8 kg (30.4 lb); shipping, 16.6 kg (36.6 lb

41、). OPERATING ENVIRONMENT Temperature: 0C to +55C. Humidity: to 95% relative humidity at +40C. Altitude: to 4600 m (15 000 ft). Vibration: vibrated in three planes for 15 min. each with 0.254 mm (0.010 in.) excursion, 10 to 55 Hz. Operators Guide Model 1744A Table 2. General Characteristics VERTICAL

42、DEFLECTION VERTICAL DISPLAY MODES Channel A; channel B; channels A and B displayed alternately on successive sweeps (ALT); channels A and B displayed by switching between channels at an approximate 250 kHz rate with blanking during switching (CHOP); channel A plus channel B (al- gebraic addition); a

43、nd trigger view. DELAY LINE: input signals are delayed sufficiently to view leading edge of input pulse without advanced trigger. INPUT COUPLING: selectable AC or DC, 50(1 (dc), or ground. Ground position disconnects input connect- or and grounds amplifier input. HORIZONTAL DISPLAY MODES Main, main

44、intensified, mixed, delayed, mag X10, and A vs B. TRIGGERING MAIN SWEEP Normal: sweep is triggered by internal or external signal. Automatic: bright baseline displayed in absence of input signal. Above 45 Hz, triggering is same as normal. For stable triggering at approx 45 Hz and below, use Normal t

45、riggering. Single: automatically switches triggering to Normal and the sweep occurs once with same triggering as Normal, reset pushbutton arms sweep and lights indicator. Single sweep is also initiated with Erase pushbutton, sweep is armed after the erase cycle. DELAYED SWEEP (SWEEP AFTER DELAY) Auto: delayed sweep automatically starts at end of delay. Trig: delayed sweep is armed and triggerable at end of delay period. TRIGGER HOLDOFF (Main Sweep): increases sweep holdoff time in all ranges. CATHODE-RAY TUBE