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1、Dual pulse presentation on 185A. Top trace shows pulse from mercury pulser applied to 2N1385 mesa tran- sistor. Bottom trace shows respond- ing turn-on of transistor. Dip in bot- tom trace at start of turn-on results from capacitance. Scape sweep speed 1 millimicrasecond/cm. Analyze mi I I i m icros
2、econd pulses Measure transistor response time Make fractional mil limicrosecond time comparisons Measure diode switching time Determine pulse jitter Make permanent X-Y plots Measure memory-unit switching . . . Measure uhf voltage amplitude _- f 60 nt in the The 185A 500 MC Oscilloscope is a complete
3、ly new instrument that is virtu- ally as simple, convenient and easy to read as conventional broadband oscillo- scopes, yet provides a wealth of fast-circuit information never before available. In such fields as computer and radar research and design, and semiconductor research, the Model 185A is th
4、e first practical, available answer to the pressing need for measuring and viewing millimicrosecond phenomena. It should be emphasized that the 185A is an existing instrument- ready for you now, with bright, clear 5” scope traces that are totally comparable i n information, clarity and usefulness wi
5、th presentations you associate with much lower frequencies. RadioFans.CN 收音机爱 好者资料库 SAMPLING OSCILLOSCOPE 185A is a sampling oscilloscope, whereas most previous oscilloscopes have been broad- band instruments. The sampling technique avoids several inherent limita- tions of the broadband approach whi
6、ch arise in the milli- microsecond region. One of these is the intrinsic sensi- tivity-bandwidth-display-size limitation of cathode ray tubes ; another is the characteristic gain-bandwidth limitation of associated amplifiers. A third critical problem with the broadband approach in the 500 MC band pa
7、ss area is that, frequently, fast pulses or occurrences happen at low repetition rates. This means that the writing rate is not sufficient to pro- vide a bright trace on the cathode ray tube. 185A adroitly sidesteps all these roadblocks by im- mediately translating the input signal to a much lower f
8、requency, through the sampling technique, then pro- ceeding with more conventional signal processing to provide standard oscilloscope operating ease and bright, clear, large-screen presentation. “Sampling” in this application is analogous to strobo- scopic light methodology in that both techniques s
9、imu- late slowing down the “motion” for better visual study -and both depend on repetition to build a faithful image. The first step in building the 185As cathode ray tube picture is to apply a staircase voltage to step the beam across the CRT face. (Figure 1). Next, input voltage samples, each take
10、n from a differing point on the waveform, are fed through the vertical amplifier to the scope face. Now, between the staircase steps, the beam is blanked so that the signal becomes a series of dots. In operation, many dots are present, and the pattern appears continu- ous. (Figure 2). Figure 1 Figur
11、e 2 A basic element of the sampling technique as here ap- plied is the incremental delay of each sampling pulse- such delay insuring that a different or successive portion of the wave is examined each time. i kL j 7 r- -t (-1 _-”i -L -_i L i L- i i - - - I i -: _ _ -A- h L _-L - 2 - _- - _ _ Figure
12、3 Figure 3 illustrates this delay process. Electrically speaking, it operates as follows. A gate is opened for a very brief time and a capacitor charged to a voltage proportional to the instantaneous amplitude of the test signal. The voltage on the capacitor remains after the gate is closed, and is
13、ampli- fied to provide vertical cathode ray tube deflection. OPERATION DESCRIBED In the case of the ($9 185A, the sampling approach is applied in the following manner. So that the entire signal under ex- amination is scanned, each succeed- ing sample is gated El RadioFans.CN 收音机爱 好者资料库 U N I Q U E A
14、 DVA NTAG E S SPECIAL, EASY-TO-USE PROBES An outstanding feature of the 185A is the pair of compact, new-concept probes arranged for easy applica- tion to the circuit under test. The probes provide a high 100,000 ohm input resistance shunted by 3 ppf to virtu- ally eliminate loading to the circuit u
15、nder test. For maxi- mum versatility, the probes may be used with Type N, BNC or other conventional fittings. Calibrated vertical sensitivity controls permit the in- strument to measure a wide range of input levels from 10 to 200 mv/cm. A vernier between steps further in- creases sensitivity to 3 mv
16、/cm. To assure maximum usefulness, the 185A has a variable time delay and a four-range time scale with a six-step scale magnifier. These features permit study of fast pulses in extreme detail and under varied trigger con- ditions. Model 185A syncs with external triggers up to 50 MC, and also provide
17、s a front panel delayed sync pulse which may be used to trigger the circuit under test. In situa- tions where the circuit will respond to this trigger, a delay line is unnecessary. Front panel controls are few in number and grouped in fa- miliar oscilloscope array. One unusual control is a front pan
18、el scanning control gov- erning the number of samples contained in a single trace. Density of these samples may be adjusted from 50 samples (a series of spaced dots) to 1,000 samples (where the presentation appears as a continuous trace). 2 millirnicrosecond pulse on 5 CRT of 185A. A particularly he
19、lpful feature of the 185A is its X-Y recorder output. The Manual Scan control can be used to further slow the input signal, permitting X-Y plot- ting for permanent records, reports, etc., with such in- struments as the Moseley Model 2D Autograf Recorder. DUAL OR DIFFERENTIAL INPUT $ 1 187A Dual Trac
20、e Amplifier is a plug-in unit for use with 185A. It permits observation and comparison of two high speed signals simultaneously, or comparisons of time, duration and spacing. The amplifier has a wide dynamic range of 3 mv to 2 volts peak ; each channel has an independent sensitivity control calibrat
21、ed to f 5%. VERTICAL (Dual Channel Bandwidth: Sensitivity: Voltage Calibrator: Input Impedance: Sweep Speeds: Greater than 500 MC at 3 db; less than 0.7 mpsec rise time Colib. ranges 10 to 200 mv/cm, * 5% accuracy Vernier sens. increase to 3 mv/cm 10 to 500 mv, f 3% accuracy 100,000 ohms, 3 ppf shun
22、t 0.1 mpseclcm to 100 mpsec/cm, 5% full sweep, 1 mpseclcm to 100 mpseclcm except on xlOO scale and first 30 mpsec of 100 mpseclcm scale. 10, 20, 50, 100 mpseclcm, vernier Less than 0.05 mpsec peak-peak 500 and 50 M C damped sine waves HORIZONTAL Time Scale: Time Scale Magnifier: x2, x5, x10, x20, x5
23、0, xlOO Jitter: Time Calibrator: Minimum Delay: 120 millimicroseconds Variable Delay Range: 10 times TIME SCALE less display time External Trigger: f 50 mv, 20 mpsec; * 0.5 v, 1 mpsec Sampling Rep Rate: 100 KC maximum Trigger Rate: 50 cps to 50 M C SYNC PULSE OUTPUT: Amplitude: Negative 3 v into 50
24、ohmv Rise Time: Approx 2 millimicroseconds Timing: Approx 20 mpsec after undelayed trace start Accessories Furnished: 187A-76A BNC Adaptors (2); 185A-21A Sync Probe Accessories Available: 187A-768 type N Adaptor, $8.00; 187A-76C 1O:l Divider, $12.50; $ 2 l87A-76D Blocking Ca- pacitor, $3.50; 187A-76
25、E 50 ohm T Connector, $15.00 PRICES: 185A Oscilloscope, $2,000.00 187A Dual Trace Amplifier, $1,000.00 H EWLETT- PACKARD COMPANY 1021A Page Mill Road Palo Alto, California, U.S.A. Hewlett-Packard S.A., Rue du Vieus Billard No. 1, Geneva, Switzerland Cable HEWPACK DAvenrJort 5-4461 Tel. No. (022) 26.
26、43.36 Cable HEWPACKSA ! id$. I E! Recently Hewlett-Packard S.A. was established in Geneva, with a branch in Frankfurt am Main, offering technical sales and engineering help and information. Previously established relationships with representatives in other parts of Europe, of course, continue. In ad
27、dition, there is a new warehouse in Base1 stocking instruments and parts, and an factory near Stuttgart is producing instruments for customers throughout Europe. )LE COMPANY, 1NC.-Advertising .ctrunic Design RadioFans.CN 收音机爱 好者资料库 (4 Sales and Service Representatives in North America + Ii,di bw* Io
28、wruiiiinr Rcorir r t r o n ! n i fL,”,i r t * $ m I France India (Continued) Radio Equipements The Scientific Instrument 65 rue de Richelieu, Paris 2 h e Tel. RIChelieu 49 88 Company, Ld B-7, Ajmeri Gate Extn. New Delhi 1 Germany Hewlett-Packard S.A. Verkaufsbiiro Frankfurt am Main Holzhausensttasse
29、 69 Telefon 55 47 27 Israel Electronic h Engineering Ltd. 6 Feierberg St., Tel-Aviv Greece Phone 4288 The Scientific Instrument Company, Ld. 30, Mount Road, Madras 2 K. Karayannis Karitsi Square, Athens + Italy Tel: 23-213 (9 Lines) Dott. Ing. Mario Vianello Via. L. Anelli 13, Milano Telef. 553-081
30、India The Scientific Instrument Company, Ld. 6, Tej Bahadur Sapru Road Allahabad 1 Japan Seki & Company, Ltd. Daini Taihei Building No. 1 Kanda Higashi-Fukudacho Chiyoda-Ku, Tokyo Tokyo (866) 3136 - 8 The Scientific Instrument Company Ld. 11, Esplanade Ea&, Calcutta 1 Overseas New Zealond Sweden Geo
31、. H. Sample & Son (N.Z.) Ltd. 431 Mount Albert Road Erik Ferner AB Snormakarvagen 35 Mount Roskili S.l, Auckland Bromma Tel: 89-439 Tel: 252870 Norway -+ Swiherlond Max Paul Frey Hangweg 27 Koniz - Bern Tel: (031) 63 36 44 Morgenstierne & Co. Colletts Gate 10, Oslo Tel. 60 17 90 Portugal Senatejo In
32、dustrial, Lda. Rua do Alecrim, 46-S/Loja Lisbon Tel: 3 44 46 - Expedlente 36 86 43 - Gerencia Taiwan (Formosa) Far-Eastern Company No. 6 Nanyang Street Taipei, Taiwan Telephone: 27876 31868 Union of South Africa F. H. Flanter & Co. (Pty.), Ltd. Buitencingle Street, Cape Town Tel. 3-3817 Spain ATAIO,
33、 Ingenieros Yugoslavia A. Aguilera, No. 8 Madrid Tel: 23 27 42 United Kingdom Livingston Laboratories Rosella House Retcar Street London N. 19, England Tel: Archway. 6251 Belram Electronics 43 Ch. de Charleroi Brussels, Belgium 57 84 51 Tel: 38.12.40 - Cooysight 1959 Newlett-PacRard Company PRINTED IN U. S. A. Registered Trademark of the Hewlett-Packard Company
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