HP-150-1300-Manual-DC-Coupling-Preamp 电路图.pdf

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1、D C COUPLING PREAMPLIFIER MODEL 150-1300 I M-150-1300-2 INSTRUCTION MANUAL HEWLETT_ PACKARD hp SANBORN DIVISION RadioFans.CN 收音机爱 好者资料库 DC COUPLING PREAMPLIFIER MODEL 150-1300 I M-150-1300-2 Printed on U.S.A. HEWLETT=- PACKARD np SANBORN -DIVISION 175 WYMAN STREET WAL THAM, MASS. 02154 RadioFans.CN

2、收音机爱 好者资料库 OPERATING MANUAL SANBORN DC COUPLING PREAMPLIFIER Model 150-1300 Sanborn CoIDpany RadioFans.CN 收音机爱 好者资料库 HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! Scanned by on-line curator: Tony Gerbic *For FREE Distribution Only

3、* SANBORN DC COUPLING PREAMPLIFIER MODEL 150- 1300 Paragraph 1 2 3 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 8 TABLE OF CONTENTS SECTION I -DESCRIPTION AND DATA Functional Description Characteristics Front Panel Data SECTION II -OPERATING PROCEDURES Basic Procedures Connecting the Preamplifier Balancing t

4、he Preamplifier Calibrating the Preamplifier Operation SECTION Ill - MAINTENANCE Introduction Removing and Replacing the Preamplifiers Adjusting the Calibration Circuit Voltage Adjusting the Damping Control Adjusting the Voltage Regulator Control Trouble Shooting Chart -Test, Symptom, Location of Fa

5、ult Table 1 -Voltage and Resistance Measurement SECTION IV - THEORY Introduction Complete Recording System Preamplifier: General Description Calibration Circuit Input Circuit: Theory Grid Circuit: Theory Plate Circuit: Theory Control Circuits Page 1 1 3 4 4 4 5 6 7 7 7 8 8 9 9 11 12 12 12 13 14 14 1

6、8 18 SECTION DESCRIPTION AND DATA 1. FUNCTIONAL DESCRIPTION The Sanborn DC Coupling Preamplifier Model 150- 1300 is a simplified general purpose Preamplifier designed for use in the Sanborn 150 Series of Recording Systems. It is used for voltage measure- ments up to 100 cycles, with single-ended or

7、push- pull input signals. The instrument features an ATTENUATOR which introduces fixed attenuation factors between Xl and XlOOO. 2. CHARACTERISTICS (Including Driver Amplifier and Galvanometer) SENSITIVITY 50 mv./cm. to 50 volts/cm. SIGNAL RANGE Reads from 5 millivolts to 250 volts. FREQUENCY RANGE

8、Zero to 100 cycles. See fig. 1. RISE TIME Five milliseconds (approx.). See fig. 1. CALIBRATION Internal, 100 mv. 13 . STABILITY Less than 0.5 mm. drift per hour. INPUT IMPEDANCE Resistive, five megohms each input terminal to ground. INPUT SIGNALS Push-pull or single-ended. IN-PHASE REJECTION Any sig

9、nal component appearing at the push-pull input terminals with the same amplitude and polarity is an in-phase component. A fraction of the in- phase voltage appears on the recording. The table shows the fraction of this in-phase voltage which appears on the record, and lists the maximum in- phase vol

10、tage which the Preamplifier will tolerate. ATTENUATOR IN-PHASE FRACTION ON SETTING LIMIT RECORD Xl 5 volts Less than 1/1000 X2 10 volts Less than 1/50 X5 25 volts Less than 1/50 XlO 50 volts Less than 1/50 X20 100 volts Less than 1/ 50 X50 250 volts Less than 1/50 XlOO 500 volts Less than 1/ 50 X200

11、 500 volts Less than 1/ 50 X500 500 volts Less than 1/50 XlOOO 500 volts Less than 1/50 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 voltage. A small fracti

12、on of the in- phase voltage appears on the recording. 1 SANBORN DC COUPLING PREAMPLIFIER MODEL 150-1300 . ., z 0 . ., . at at w . :a . :a 0 2 z .J c 0 C 9 . 0 . z . u at . . 2 eo 70 60 50 40 INPUT SIGNAL o 10 - 1 I I I I I I I TO 4 % I RISE TIME : 5 MSEC. FREQUENCY IN CYCLES PER SECONO Figure 1. Com

13、bined Response Characteristics of the Sanborn DC Coupling Preamp/Hier, Driver Amplifier and Galvanometer. 1 2. CHARACTERISTICS (Cont.) r-1 I i,.- 1 I I 0 l _ I b : -+- I L-G=-o_u_R_C,!_J 3. FRONT PANEL DATA ATTENUATOR A multi-position switch which attenuates the input voltage by the ratios marked oo

14、 the panel. SENSITIVITY Adjusts the gain of the amplifier. Clockwise rota- tion increases the gain. BALANCE A protective button covers the BALANCE control. Eliminates the residual internal unbalance of the Amplifier. POSITION Sets the stylus base line. Clockwise rotation moves DESCRIPTION AND DAT A

15、Differential voltage a - b a+ b In-phase voltage - 2- the stylus up-scale. CAL lOOMV Impresses lOOMV on one grid of 1301 for calibra- tion. USE-OFF-CAL-CAL ADJ Sets the Preamplifier for operation, calibration, or grounds the input circuit to protect the system. INPUT Three circuit jack for applying

16、the input signal through a three terminal phone plug. 3 SANBORN DC COUPLING PREAMPLIFIER MODEL 150-1300 4 SECTI ON II OPERATING 1. BASIC PROCEDURES There are four basic procedures in operating the Sanborn DC Coupling Preamplifier: Connecting . paragraph 2 Balancing . paragraph 3 Calibration . paragr

17、aph 4 Operation . paragraph 5 2. CONNECTING THE PREAMPLIFIER Apply power and allow 30 minutes warmup for sta- bility. Connect the signal to the INPUT jack on the panel or to 204 at the Driver Amplifier rear, as shown in figure 2. Always remove the plug from the INPUT socket when using 204. a. With t

18、he push-pull (balanced) connections, the recording shows the potential between the two signal terminals. In-phase signals between these two terminals and ground are rejected. (See paragraph 2 section 1.) b. With the single-ended(unbalanced) connections, the recording shows the potential between the

19、live terminal and ground. c. To record the difference of two single-ended signals, connect one signal between one push-pull input terminal and ground, and connect the other signal between the other input terminal and ground. The instantaneous average of the two signals is PROCEDURES present at the t

20、wo input terminals as an in-phase potential. A fraction of this in-phase potential appears on the record; see paragraph 2, Section I, for in-phase rejection data. d. To record the sum of two (or more) signals, connect to the Preamplifier as a single-ended (unbalanced) signal through an external mixi

21、ng circuit. Al ways correct for the attenuation of the mixing circuit when interpreting the recording. 3. BALANCING THE PREAMPLIFIER Balancing is important but is usually not required a:; an operational step. Avoid the possibility of out- of-balance operation by checking the balancing after each war

22、 mup period and before each series of recordings. a. After 30 minutes warmup, set the panel controls for balancing: ATTENUATOR . 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 sty

23、lus motion. c. If the stylus moves, remove the chrome button marked BALANCE and adjust the control with a screwdriver for zero stylus mption while the SEN- SITIVITY control is turning. d. Replace the chrome button. The Preamplifier is now balanced. 4. CALIBRATING THE PREAMPLIFIER Calibration adjusts

24、 the DC Coupling Preamplifier to its rated sensitivity of 50 millivolts per centimeter. a. After war mup, and balancing, set the panel controls for calibration: ATTENUATOR . XI r-1 I OPERATING PROCEDURES 11 USE-OF F-CAl.r CAL ADJ . CAL POSITION . to center the stylus b. Intermittently press the CAL

25、button, and adjust the SENSITNITY control for a two centimeter deflection on the recording. c. Return the USE-OFF-CAL-CAL ADJ switch to OFF. The Preamplifier is now calibrated. -=Ci 0 ;: -._ _ ,: _ , : ro me + :t. i_ _ _ _ -fL.-_.J I. I I L-!_UJ -, 0Jt0 4 : 4 -f._ 0 o0o 0 PUSH-PULL (BALANCED) SIGNAL

26、 r-1 TO INPUT JACK .:f : -? I -I : SIGNAL SOURCE 1 . _ J -. SINGLE- ElVED (UNBALANCED) SIGNAL REQUIRED WHEN ADJUSTING THE CALIBRATION CIRCUIT TO INfUT JACK -, o Jro -: - 4 0 0 . - 0 0 0 SINGLE -ENDED (UNBAL ANCEO) SIGNAL figure 2. Input Circuit Connections to INPUT Jack or to J204 at Rear of Driver

27、Amplifier. 5 SANBORN DC COUPLING PREAMPLIFIER MODEL 150- 1300 6 5. OPERA TIOM a. After warmup, balancing, and calibration, set the panel controls for operation: ATTENUATOR . OFF USE-OFF-CAL-CAL ADJ . USE POSITION . to center the stylus Then advance the ATTENUATOR for a convenient stylus deflection,

28、or set the appropriate attenuation factor for the expected signal. b. Turn on the paper drive motor and start the recording. c:. Read the input signal in volts from the formula: Volts (.05)(cm deflection)(ATTENUATOR setting) - MAINTENANCE Ill SECT I 0 N Ill MAINTENANCE 1. INTRODUCTION This Section c

29、ontains the installation and mainten- ance data for the Sanborn DC Coupling Preamplifier Model 150-1300, when used in the 150 series of Sanborn recording equipment. The data includes trouble shooting procedures to help locate the source of faulty or erratic operation and instructions for all control

30、 adjustments which are not normally used in operation. 2. REMOVING AND REPLACING PREAMPLIFIERS a. To remove a Preamplifier, turn off the POWER switch on the associated Power Supply. Loosen the thumb-nuts behind the chrome handles on the Pre- amplifier and pull the Preamplifier from its recess. b. To

31、 replace a Preamplifier, check that the POWER switch on the associated Power Supply is turned off. Insert the new Preamplifier into the vacant space, taking care that the multi-circuit connector at the Preamplifier chassis rear becomes properly engaged with the mating connector on the Driver Amplifi

32、er. Align the two small dowels at the top corners of the Preamplifier with the correspond- ing holes in the framework. Then press the Pre- amplifier in firmly and tighten the thumb-nuts. 3. ADJUSTING THE CALIBRATION CIRCUIT VOLTAGE The calibration circuit is adjusted by the +SOV ADJ control located

33、at the Driver Amplifier rear. It is set at manufacture, and should require adjustment only after extended use, or after replacing the glow tube voltage regulator in the Driver Amplifier. a. Connect a laboratory type cadmium cell (1.019 volts) co the INPUT jack on the Preamplifier panel as shown in f

34、igure 3. t Figure 3. Connecting 1.019 volt Cell. b. Set the Preamplifier controls for calibration circuit adjustment: ATTENUATOR . Xl SENSITIVITY . fully clockwise POSITION . to center the stylus USE-OFF-CAL-CAL ADJ . OFF c. Locate the +80V ADJ control R236 at the Driver Amplifier rear. See figure 4

35、. J203 J204 +0 O)C)7 RBS R237 -(!)GNO I OtUY(llt I . , . 11 Figure 4. Driver Amplifier, Rear View 7 SANBORN DC COUPLING PREAMPLIFIER MODEL 150-1300 8 d. Intermittently turn the USE-OFF-CAL-CAL ADJ switch between OFF and CAL ADJ. and adjust the +80V ADJ control R236 for minimum stylus motion. e. Remo

36、ve the standard cell. The calibration volt- age is now adjusted for both the Sanborn DC Coup- ling Preamplifier Model 150-1300 or the Sanborn AC-DC Preamplifier Model 150-1000. Recalibrate the Preamplifier before further operation. 4. ADJUSTING THE DAMPING CONTROL The Damping control aHects the tran

37、sient and fre- quency response of the recording. Refer to the Instruction Manual for the Sanborn Driver Amplifier and Power Supply Model 150-200/400, 150-200A/ 400. SIGNAL . ORtlfR PllEAMPLIFIER AMPLlIEll SIGN POWER 115 VOLTS POWER AC POY,Ell SUPPLY 5. ADJUSTING THE VOLTAGE REGULATOR CONTROL This co

38、ntrol sets the regulated plate supply voltage at +250 volts. Refer to the Instruction Manual for the Sanborn Driver Amplifier and Power Supply Model 150-200/400, 150-200A/400. 6. TROUBLE SHOOTING Figure 5 is a block diagram showing one channel of a Sanborn 150 series Recording System. This drawing s

39、hows the possible locations of trouble: (1) the signal and the operating techniques, (2) the power line, (3) the Preamplifier, (4) the Driver Amp- lifier, (5) the Power Supply, (6) the Galvanometer. This paragraph shows how to track down the trouble by a process of eliminatinn. SIGNAL - RECOROE.R ,

40、. FINIS HEO ROING RECO figure 5. Simplified Block Diagram of 150 Series Recording System. - TROUBLE SHOOTING (Cont.) TEST 1. Repeat the steps of connect- ing the signal, balancing, cal- ibration, etc., at the Preamp- lifier. 2. Check that the signal ap- plied to the Preamplifier is within the signal

41、 ratings. 3. Measure the line voltage and frequency. 4. Che ck the non-operational adjustments of the Driver Amp- lifier and the Preamplifier, as given in the instruction man- uals. SYMPTOM CASE 1. The system now oper- ates normally, with no apparent fault. CASE 2. One or more steps do not proceed n

42、ormally. CASE 1. The signal is outside the ratings. CASE 2. The signal is inside the ratings. CASE 1. Line voltage and fre- quency are outside the rated limits. CASE 2. quency limits. Line voltage and fre- are inside the rated CASE 1. One or more adjust- ments require re-setting. CASE 2. The adjustm

43、ents are normal. MAINTENANCE Ill LOCATION OF FAULT The fault was probably in the operating technique. This is the most common cause of un- satisfactory operation. The operation techniques are not at fault if the operating in- structions are followed exactly. The trouble is probably in the signal, or

44、 somewhere in the system. Continue with test No. 2. The signal is probably at fault. This is a common cause of unsatisfactory operation. The signal is normal, and the fault is somewhere else in the system. No. 3. Continue with test The fault is probably in the line voltage or frequency. Line voltage

45、 and frequency are not at fault, and the trouble is somewhere else in the system. Continue with test No. 4. These adjustments were possibly at fault. Non-operational adjustments are not at fault, and the trouble is somewhere eise in the system. Continue with test No. S. 9 SANBORN DC COUPLING PREAMPL

46、IFIER MODEL 150-1300 10 TROUBLE SHOOTING (Cont.) TEST (Cont./ 5. Check the Preamplifier by removing it from the Driver Amplifier, and replacing it with one which is known to be good. Turn the POSITION control of the replacement Preamplifier back and forth over its range. Figure 6 shows an alternate

47、plug-in circuit which may be used if a replacement Preamp- lifier is not available. 6. If test No. 5 shows that the fault is in the Preamplifier, check for a defective tube in the Preamplifier. 7. If the fault was not caused by defective tubes (test No. 6), check the voltage and resis- tance at each tube socket terminal as shown in the follow- ing table. SYMPTOM (Cont