HP-150-1000-Manual-AC-DC-Preamp-Chopper 电路图.pdf

150-1000 AC-DC PREAMPLIFIER OPERATING AND SERVICE MANUAL HEWLETT PACKARD b,g SANBORN DIVISION IM 150 10002 RadioFans.CN 收音机爱 好者资料库 INSTRUCTION MANUAL Sanborn AC-DC Preamplifier Model 150-1000 Sanborn Company RadioFans.CN 收音机爱 好者资料库 HP Archive This vintage Hewlett Packard document was preserved and distributed by Please visit us on the web ! Prepared by on-line curator: Tony Gerbic For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 SANBORN AC-DC PREAMPLIFIER MODEL 150-1000 Paragraph 2 3 1 2 3 4 5 6 7 8 1 2 3 4 5 6 2 3 4 5 6 7 8 9 10 11 TABLE OF CONTENTS SECTION I -DESCRIPTION AND DATA Functional Description Tabulation of Characteristics Front Panel Data Introduction Starting Balancing Calibration SECTION II -OPERATION Operation: As AC Preamplifier Operation: As DC Preamplifier without Zero Suppression Operation: As DC Preamplifier with Zero Suppression Operation: As DC Preamplifier Null Indicator SECTION Ill -MAINTENANCE Introduction Removing and Replacing Preamplifiers Adjusting the Calibration Circuit Voltage Adjusting the Damping Control(s) Adjusting the Voltage Regulator Control Adjusting the DC Gain Control SECTION IV -THEORY Introduction Complete Recording System General Description: AC Operation General Description: DC Operation Input Circuit Calibration Circuit Zero Suppression Circuit Input Circuit of VlOOl Interstage Circuit: AC Operation Interstage Circuit: DC Operation Output Circuit Page 1 1 2 4 4 4 6 6 6 6 7 8 8 8 9 9 9 10 10 10 11 12 13 13 15 16 16 17 - - . - . . - SANBORN COMPANY 175 WYMAN STREET WALTHAM, MASS. 02154 AREA CODE 617 TEL: 894-6300 OCTOBER 23, 1959 INSTRUCTION MANUAL SUPPLEMENT IM-150-1000-2.A SANBORN AC-DC PREAMPLIFIER MODEL 150-1000 The Instruction Manual lM-150-1000-2 for the AC-DC Preamplifier should be corrected as follows: Page 9, paragraph 6d This paragraph does not apply here, should replace paragraph 3d at top of page. ; DESCRIPTION AND DATA_ I SECTIO N I DESCRIPTION AND DATA 1. FUNCTIONAL DESCRIPTION The Sanborn AC-DC Preamplifier Model 150-1000 is a general-purpose plug-in preamplifier designed for use in the Sanborn 150 series of recording systems. It is used for voltage measurements up to 100 cycles, with single-ended or push-pull input signals. The instrument features a RANGE control calibrated directly in terms of voltage sensitivity, and a DC ZERO SUPPRESSION control which can suppress single-ended positive d-c voltages up co 20 times the full scale value. 2. TA BULA TION OF CHARACTERISTICS (Including Drivr Amplifier and Galvanometer) SENSITIVITY AC: 1 mv./ cm. to 2 volts/ cm. DC: 1 mv./mm. to 2 voles /mm. SIGNAL RANGE AC: reads from 0.1 mv. to 10 voles. DC: reads from l mv. co 100 voles. FREQUENCY RANGE AC: 1-100 cycles. See fig. 1. DC: 0-100 cycles. See fig. 1. RISE TIIE five milliseconds (approx). See fig. l. CALI BRA TIOK Internal. AC: 2 mv. 13 . DC: 20 mv. :!:13 . STABILITY AC: Orift less than 0.2 mm./ hr. DC: Drift less than 1 mm./ hr. after 90 min. warmup. lPLT IIPEDAKCE DC: Five megohms each input terminal to ground. AC: Same, with 0. 1 !FD in series wich each input. INPUT SIGNALS Push-pull or single-ended. ZERO SuPPRESSION To 20 times full scale voltages, wich 500 volt max- imum limit. DC vs AC Jn both AC and DC operation, the system records the waveform of the signal. AC operation is more sensitive than DC by a factor of ten, and the fre- quency response does not extend to zero cycles (see fig. 1). With DC operation, the response of the recording extends to zero cycles, and zero sup- pression facilities arc available. I, -PHASE REJ ECTIOX Any s ignal component appearing ac che push-pull input terminals wich che same amplitude and polar- ity is an in-phase component. A fraction of che in-phase voltage appears on che recording. The table shows the fraction of this in-phase voltage which appears on che record, and liscs chc maximum in-phase voltage which the Preamplifier will tol- erate. 2 SANBORN AC- DC PREAMPLIFIER MODEL 150-1000 RANGE IN-PHASE FRACTION LIMIT ON RECORD .001 5.0 volts Less than 1/1000 .002 5.0 volts Less than 1/1000 .005 2.0 volts Less than 1/25 .01 3.0 volts Less than 1/25 .02 5.0 volts Less than 1/ 25 .05 12.5 volts Less than 1/25 .1 25 voles Less than 1/ 25 .2 25 voles Less than 1/ 2 5 .5 25 volts Less than 1/ 25 1.0 25 volts Less than 1/25 2.0 25 volts Less than 1/25 r-1 t _ b The instantaneous voltage a exists between one input lead and ground. The instantaneous voltage b exists between the other input lead and ground. The Preamplifier measures the differential volcage. A small fraction of the in-phase voltage appears on the recording. Differential voltage a - b a+ b In-phase voltage - 2 3. FRONT PANEL DATA IKPUT Three circuit jack for applying the input signal thr- ough a three terminal phone plug. SENSITIVITY Adjusts the gain of the Preamplifier during calibra- tion, so chat the values of sensitivity marked on the RANGE switch arc accurate. Clockwise rotation increases the gain. AC/DC Connects the Preamplifier for AC ( condcnser- coupled) operation, or DC (direct-coupled) operation. ZERO SCPPRESSIO IN;OUT Makes the zero suppression facilities of the Pre- amplifier available or not as required. ZERO SUPPRESSION Hclipot control with a ten-turn counting dial, cal- ibrated from l to 1,000. Each division on the dial represents one millimeter of baseline suppression, providing SENSITIVITY seccing is accurate . RANGE A multi-position switch which selects the system sensitivities marked on the panel. CAL Push- buccon switch for applying the calibration signal. DC BALANCE Maintains the vol cage balance of the DC interstage coupling circuic. AC BAL A protective button covers the AC BAL control. Screwdriver-controlled adjustment, for maintaining output stage balance. POSITIO Sets the stylus base line. Clockwise rotation moves the stylus up-scale. USE;OFF /CAL Sets the Preamplifier for operation, or calibration, or grounds the input circuit to protect the system. w V z 0 Q. V UI 0: 0: UI t- UI :! 0 z .J c( C IL 0 t- z w 0 0: w Q. DESCRIPTION AND DATA - I :! 2 Q 0 2 110 100 90 80 70 I 60 50 40 30 20 10 0 0.4 _ l.; ll II J v 0.6 - TO ZERO t DC - v f-< f< II Iii; Iii.- i _/00 . rrs ( DC INPUT Al SIGNAL i 12 % DOWN AT I 100 MSEC. 4% DOWN AT 50 MSEC. ii RISE TIME: 5 MSEC. 2 5 10 20 50 FREQUENCY IN CYCLES PER SECOND Figure 1. Combined Response Characteristics of the Sanborn AC-DC Pre,1mplifier, Driver Amplifier and Recorder. 100 3 4 SANBORN AC-DC PREAMPLIFIER MODEL 150-1000 SECTION II OPERATION 1. INTRODUCTION There are four basic procedures in operating the Sanborn AC/ DC Preamp! ifier: Starting . paragraph 2 Balancing . paragraph 3 Calibration . paragraph 4 Operation . AC. . paragraph 5 2. STARTING DC . paragraph 6 DC, v.ith zero suppression . paragraph 7 DC, as null indicator . . . . . . . . . . . paragraph 8 Apply power and allow 90 minutes warmup for max- imum stability. Connect the signal to the INPUT jack on the pane l or to J204 at the Driver Amplifier rear, as shown in figure 2. Always remove the plug from the INPUT socket when using J204. o. ith the push-pull balanced) connection, the recording shows the potential between the two signal terminals. A fraction of the in-phase signal be- tween these two terminals and ground appears on the record (see Paragraph 2, Section I). b. With the single-ended (unbalanced) connections, the recording shows the potential between the live terminal and ground. c. Operation with zero suppression requires a posi- tive, single-ended (unbalanced) s ignal, connected to the phone plug tip or to J 204-1. Negative signals require a series battery or equivalent, to keep the signal applied to the Preamplifier input always pos- itive with respect to ground. d. To record the difference of two single-ended signals, connect one signal to one push-pull input terminal and the other signal to the other input terminal. The instantaneous average of the two sig- nals is present at the two input terminals as an in- phase potential. A fraction of tlus in-phase pott:nt- ial appears on the record; see page 2 for in-phase rejection data. e. To record the algebraic sum of two (or more) voltages, connect to the Preamplifier through an external mixing circuit. Al ways correct for the attenuation of the mixing circuit v. hen interpreting the recording. 3. BALANCING Balancing is important, but is usually not required as an operational step. Avoid the possibility of out-of-balance operation by checking the balancing after each warmup period and before each series of recordings. a. After 90 minutes warmup, set the panel concrols for balancing. OPERATION_ 11 RANGE . Off AC-DC . AC ZERO SUPPRESSION L-OUT . OUT USE-OFF-CAL . OFF POSITION . . . . . . . . . . . . . . . . . . to center the stylus b. Turn the SENSITIVITY control back and forth from one end of its rotation to the other, and watch the stylus. There should be no stylus motion. If the stylus moves, remove chrome button marked AC BAL and adjust the control with a screwdriver for zero stylus motion while the SENSITIVITY control is turning. r-1 I Potentiometer RJ065 located behind the ZERO SUPPRESS/ON potentiometer RI028 is used as a coarse AC balance. When a tube is changed or balance cannot be gained with the AC Bal control, center the AC Bal control, and use R1065 as a coarse balance and then balance with AC Bal control. c. Set the RANGE switch to .001 and the AC/DC switch to DC. Return the stylus toward mid-scale with the DC BALANCE control. d. Turn the RANGE switch back and forth between .001 and .002, and adjust the DC BALA./CE control for zero motion of the writing arm while the RANGE switch is moving. POSITIVE FOR UP-SCALE DEfLECTION _.:.;_., TO INPUT JACK ._.-, I I 1L_ :u J -, 0J204 : 4 -.,-:_,J._-_-_-_-:_-_-_-0 0 o 0 PUSH-PULL(BALANCED)SNAL r-, I PO:ll:-s:L-:- _,_ , . , TO INPUT JACK -=- : -2 I I t SIGNAL SOURCE 1 ._ _ J -. , SINGLE- ENDED (UNBALANCED) SIGNAL (Required for null indicator operation, or for operation with zero suppression). SINGLE - END ED (UNBALANCED) SIGNAL Figure 2. Input Circuit Connections for Sanborn AC-DC Preamplifier, Model 150-1000. 5 6 SAN.BORN. AC-DC PREAMPLIFIER MODEL 150-1000 4. CALIBRATION. Calibration adjusts the Preamplifier to the sensi- civity values marked on the RANGE control. o. After warmup and balancing, set che panel con- trols for calibration: RA_ GE . fully clockwise (.001) ZERO SUPPRESSION I-OUT . OUT USE-OFF-CAL . CAL POSITION . to center the stylus AC I DC . DC b. lncermiccently press che CAL button and adjust the SENSITIVITY control for a two centimeter def- lection on che recording. c. Return the RAlGE switch co OFF and the USE- OFF-CAL switch to OFF. The preamplifier is now calibrated. 5. OPERATION.: AS AC PREAMPLIFIER With this type of operacion, the recording shows the waveform of the input signal, with a high maximum sensitivity available. The frequency response does not extend co zero cycles. a. After warmup, balancing, and calibration, set the controls for AC operation: RANGE . OFF AC-DC . AC USE-OFF-CAL . USE POSITION . co sec the baseline b. Turn the RAGE switch co the right for a con- venient stylus deflection, or set to the appropriate sensitivity for the expected s ignal. c. Turn on the paper drive motor and stare the recording. 6. OPERATION. ( As DC Preamplifier without zero s uppression) Uith this type of operation, the recording shows che waveform of the input signal, down to zero cycles. a. After warmup, balancing, and calibration, set the panel controls for DC operation. RANGE . OFF AC-DC . DC ZERO SUPPRESSION IN-OUT . . . . . . . . OUT USE-OFF-CAL . USE POSITION . .to set the baseline b. Turn the RANGE switch co the right for a con- venient stylus deflection, or set to the appropriate sensitivity for the expected s ignal. c. Turn on the paper drive motor and start the recording. 7. OPERATION. (As DC Preamplifier with zero suppression) With this type of operation, the input must be a single-ended signal, connected as identified in figure 2. The recording shows the wave form of the input signal, down to zero cycles. o. After warmup, balancing, and calibration, set the panel controls for DC operation wich zero sup- pression. RANGE . OFF AC-DC . DC ZERO SUPPRESSION IN-OUT . . . . . . . . . . . . . IN ZERO SUPPRESSION . fully counterclockwise USE-OFF-CAL . USE POSITIOK . co set the bas eline b. Uhen the steady componem (to be suppressed) and the varying component (to be recorded) are both known, set the RANGE switch for the varying com- ponent, and suppress the steady component by set- ting the ZERO SUPPRESSION control to the correct number of millimecers of suppression on the record- ing at the rate of one millimeter of suppression per division on the dial. To Illustrate: When reading a signal which varies between 0.60 and 0.65 volts, the varying component is 0.05 volts. This corresponds to a full-scale deflection with the RANGE control at .001. Suppress the 0.60 volt component by turning the DC ZERO SUPPRESSION control to 600. c. When either the steady component (to be sup- pressed) or the varying component (to be recorded) are unknown, advance the RANGE switch for a rea- sonable deflection, and advance the ZEHO SUP- PRESSION control to subtract a convenient amount of the steady component. Continue until the varying component is spread over as much of the chart as convenient. d. Turn on the paper drive motor and start the re- cording. Read the recording by adding algebraically the stylus deflection (in millimeters from the base- line) and the ZERO SUPPRESSION control setting (in divisions), and then multiplying this sum by the RANGE switch setting. (The oper