Tektronix TEKFAX ADA400A Instruction Manual Download Page 55

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Adjustment Procedures

ADA400A Differential Preamplifier

RV106

(10X Gain)

CV17

R18

(HF CMRR)

CV13

CV14

(LF Compensation)

CV6
(LF Compensation)

CV12

CV18

CV4 (HF)

RV17
(LF CMRR)

RV62
(100X Gain)

RV33
(Offset Balance)

RV32

(Offset Zero)

*Factory adjust only

Figure 16: Location of Adjustments Underneath Inner Shield

Summary of Contents for TEKFAX ADA400A

Page 1: ...eamplifier 070 9164 02 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the S...

Page 2: ...and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 50...

Page 3: ...any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish ser...

Page 4: ......

Page 5: ...ecifications 21 Nominal Characteristics 21 Warranted Characteristics 22 Typical Characteristics 24 Performance Verification 29 Requirements for Performance 29 Equipment Required 29 Procedures 30 Adjus...

Page 6: ...e 15 Typical and Warranted CMRR in X100 Gain 28 Figure 16 Location of Adjustments Underneath Inner Shield 43 Figure 17 Replacing TEKPROBE Interface Pins 53 Figure 18 Replacing the TEKPROBE collar 53 F...

Page 7: ...ecks 36 Table 16 Equipment Settings for X10 10 kHz CMRR Checks 37 Table 17 Equipment Settings for X10 100 Hz CMRR Checks 37 Table 18 Equipment Settings for Gain Adjustments 44 Table 19 Equipment Setti...

Page 8: ...Table of Contents iv ADA400A Differential Preamplifier...

Page 9: ...nections to the input or output terminals of the product ensure that the product is properly grounded To avoid electric shock or fire hazard do not operate this product with covers or panels removed T...

Page 10: ...ge to this product or other property These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immed...

Page 11: ...asics contains a graphical overview and a brief description of each control and connector of the ADA400A Differential Preamplifier H The Reference section describes how to connect the ADA400A Differen...

Page 12: ...m Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 6 00 a m 5 00 p m Pacific...

Page 13: ...r equal to 100 000 to 1 in the frequency range of DC to 10 kHz removes unwanted common mode electrical noise from sensitive pickups H Bandwidth of greater than or equal to 1 MHz amplifies signals with...

Page 14: ...fier housing and disconnect the internal line that carries the scale factor coding Compatible Oscilloscopes Most oscilloscopes with the TEKPROBE interface except the 11000 Series models are compatible...

Page 15: ...he ADA400A Differential Preamplifier to any oscilloscope that does not provide TEKPROBE power The 1103 TEKPROBE Power Supply has connections for two probe channels NOTE Use the offset controls of the...

Page 16: ...Adjust the oscilloscope to display a flat signal trace at center screen 3 Connect the output of the ADA400A Differential Preamplifier or 1103 TEKPROBE Power Supply to the input connector of the oscil...

Page 17: ...ET controls to ON 8 Adjust the COARSE and FINE controls to bring the trace to center screen 9 Set each input separately to AC DC and back to GND and check that the offset controls still bring the trac...

Page 18: ...Getting Started 6 ADA400A Differential Preamplifier...

Page 19: ...hical overview and a brief description of each control and connector of the ADA400A Differential Preamplifier See Figures 2 through 4 and Table 2 1 Input Coupling Vertical Offset Controls Upper Bandwi...

Page 20: ...Basics 8 ADA400A Differential Preamplifier Input Fuse Input Fuse Input BNC Connector Input BNC Connector Figure 3 Input Connectors and Fuses TEKPROBE Interface Pins Signal Output BNC Figure 4 Output...

Page 21: ...for coupling the input signals to the internal inputs of the preamplifier The AC position couples the input signal through a capacitor and blocks any DC and AC components of the signal from 0 to 2 Hz...

Page 22: ...3 to determine the effective volts division setting The effective volts per division is the volts per division setting of the oscilloscope divided by the gain setting of the ADA400A Differential Pream...

Page 23: ...leads you should use and the way you should connect the inputs WARNING To prevent personal injury do not attach the ADA400A Differential Preamplifier to human subjects for any testing or bio monitori...

Page 24: ...arge voltages a fuse on each input opens if the input current exceeds 62 mA 1 16 A To replace or check these fuses refer to the procedure on page 54 Each input connector of the ADA400A Differential Pr...

Page 25: ...of the preamplifier Do not remove the inner shield With a pair of needle nose pliers or tweezers move the jumpers from the 1 M to the infinite position as Figure 5 illustrates Infinite 1 M Input Inpu...

Page 26: ...signal is connected to the input and the other is connected to the input Because the preamplifier inverts the signal at the input the preamplifier amplifies only differential voltages between the inpu...

Page 27: ...ADA400A Differential Preamplifier determine signal coupling amplification DC offset and the bandwidth limit The type of input coupling you select depends on whether or not you want to pass or block t...

Page 28: ...nput coupling capacitor to charge to the DC level of the signal source 4 Set the input coupling switch to AC Position the AC signal within the graticule area on the oscilloscope display The gain selec...

Page 29: ...ange Figure 8 Input and Offset Range for X 0 1 Gain 40 30 20 10 10 20 30 40 Maximum Differential or Single Ended Input Common Mode Range and Offset Range Figure 9 Input and Offset Range for X 1 Gain 1...

Page 30: ...ch of the oscilloscope to the appropriate settings based on the amount of offset you expect to measure See Figures 8 through 11 Select a lower gain setting if you are unsure of the amount of the offse...

Page 31: ...sensitive electronic detectors or amplifiers can receive and amplify Switch mode power supplies generate interference in the range of 20 to 100 kHz Sources of interference can include florescent ligh...

Page 32: ...Hz 3 kHz 100 MHz and FULL 1 MHz Some pieces of electronic or electrical equipment can generate enormous amounts of electrical noise One solution is to isolate or eliminate the noise that these devices...

Page 33: ...rms of limits that are performance requirements Table 4 Nominal Characteristics Signal Acquisition System Name Description Input Configuration Differential and Input Coupling DC AC or GND Ground coupl...

Page 34: ...nd vibration within the operating limits described in these specifications H The instrument must have had a warm up period of at least 20 minutes H The instrument must be used with an oscilloscope tha...

Page 35: ...e for the ambient temperature of 22 5_ C Table 6 Warranted Characteristics Environmental Name Description Atmospherics Temperature Operating 0_ C to 50_ C Non operating 55_ C to 75_ C g Relative Humid...

Page 36: ...range of 27 MHz to 500 MHz Electrostatic Discharge ESD Up to 8 kV with no change to control settings of impairment of normal operation and up to 15 kV with no loss of stored data or damage that preven...

Page 37: ...s than 25 pA at an ambient temperature of 22 5_ C Random Noise RMS Noise Random Noise RMS Noise Bandwidth Selection Gain of 0 1 Gain of 1 Gain of 10 Gain of 100 1 MHz 5 mV 3 mV 50 V 30 V 100 kHz 4 mV...

Page 38: ...ng 1 78 kg 3 92 lbs including accessories Net Weight 1 14 kg 2 51 lbs Overall Dimensions Height 36 mm 1 42 in Width 112 mm 4 41 in Depth 203 mm 8 00 in Cable Length 2 m 78 7 in 10 100 1 k 10 k Frequen...

Page 39: ...0 100 90 80 70 60 50 40 30 20 10 0 dB Gain 1 0 DC Typical AC Typical Figure 13 Typical AC and DC Coupled CMRR in X1 Gain 10 100 1 k 10 k Frequency Hz 100 k 1 M 110 100 90 80 70 60 50 40 30 20 10 0 dB...

Page 40: ...s 28 ADA400A Differential Preamplifier 10 100 1 k 10 k Frequency Hz 110 100 90 80 70 60 50 40 30 20 10 0 dB Gain 100 0 DC Typical DC Warranted AC Typical 100 k 1 M Figure 15 Typical and Warranted CMRR...

Page 41: ...ation section on page 2 H The ADA400A Differential Preamplifier has a period of at least a 20 minutes to warm up prior to verification Equipment Required Table 9 lists the equipment required to verify...

Page 42: ...ation 9 Coaxial Cables 2 50 36 in L BNC male both ends Tektronix part number 012 1341 00 Signal connection 10 Adjustment Tool Probe Plastic Insulated Tektronix part number 003 0675 01 Adjustments Adju...

Page 43: ...o DC 4 Connect coaxial cable from input of ADA400A to the BNC to banana adapter on the multimeter 5 Check input resistance 1 M 2 980 k to 1 02 M 6 Remove coaxial cable from ADA400A input and connect i...

Page 44: ...alibration Generator Control Setting Output 50 mV 1 kHz 2 Connect a dual input connector to inputs of ADA400A 3 Connect a coaxial cable from calibration generator output to dual input connector 4 Adju...

Page 45: ...he inputs of the ADA400A Equipment Required One digitizing oscilloscope item 1 One dual input coupler item 6 1 Connect the ADA400A to Ch1 of the oscilloscope Table 11 Equipment Settings for Offset Adj...

Page 46: ...equired One digitizing oscilloscope item 1 One sine wave generator item 2 One dual input coupler item 6 One 50 terminator item 7 Two 10X attenuators item 8 Two coaxial cables item 9 1 Connect the ADA4...

Page 47: ...wave generator for 5 divisions on screen 9 Remove the two 10X attenuators and connect the cable directly to the 50 terminator 10 Set ADA400A input to DC 11 Set oscilloscope to 1 mV div 12 Measure sign...

Page 48: ...10 V div Measure trace is 3 2 divisions wide 32 V 90 dB 21 Modify the equipment settings according to Table 15 Table 15 Equipment Settings for X10 100 kHz CMRR Checks ADA400A Setting Gain 10 Upper Ba...

Page 49: ...loscope to 100 V div Measure trace is 0 56 division wide 56 V 85 dB 29 Modify the equipment settings according to Table 17 Table 17 Equipment Settings for X10 100 Hz CMRR Checks ADA400A Setting Upper...

Page 50: ...Performance Verification 38 ADA400A Differential Preamplifier...

Page 51: ...re for use only by qualified personnel To avoid injury do not perform any servicing other than that stated in the operating instructions unless you are qualified to do so Refer to all safety summaries...

Page 52: ......

Page 53: ...ollowing requirements H You must be a trained service technician to perform this procedure H You must adjust the ADA400A Differential Preamplifier in an environment in which temperature altitude humid...

Page 54: ...t of theADA400A Differential Preamplifier to the oscillo scope turn the oscilloscope on and let the ADA400A warm up for 20 minutes NOTE Before performing these procedures make sure your oscilloscope c...

Page 55: ...plifier 43 RV106 10X Gain CV17 R18 HF CMRR CV13 CV14 LF Compensation CV6 LF Compensation CV12 CV18 CV4 HF RV17 LF CMRR RV62 100X Gain RV33 Offset Balance RV32 Offset Zero Factory adjust only Figure 16...

Page 56: ...tting Input DC Input Gnd Gain 100 Upper Bandwidth 100 kHz Offset Off Oscilloscope Setting Channel Selection Ch1 Vertical input impedance 1 M Vertical gain 10 mV div Time base 200 s div Coupling DC Ver...

Page 57: ...digitizing oscilloscope item 1 1 Connect the ADA400A to Channel 1 and make the equipment settings according to Table 19 Table 19 Equipment Settings for Offset Adjustments ADA400A Setting Input Gnd In...

Page 58: ...nd 100 and verify that trace does not shift more than one division from center 6 Disconnect setup Equipment Required One digitizing oscilloscope item 1 One sine wave generator item 2 One dual input co...

Page 59: ...8 Set oscilloscope volts div to 1 mV 9 Adjust RV17 for minimum signal amplitude 10 Disconnect setup Equipment Required One digitizing oscilloscope item 1 One sine wave generator item 2 One dual input...

Page 60: ...a coaxial cable from sine wave generator output to 10X attenuators 7 Adjust trigger level for a steady display 8 Adjust amplitude for 5 divisions 10 mV on screen 9 Remove the two 10X attenuators and c...

Page 61: ...l input connector 4 Connect a coaxial cable to calibration generator fast rise output to 50 terminator 5 Connect a coaxial cable from trigger out of calibration generator to Ch4 of oscilloscope 6 Adju...

Page 62: ...Adjustment Procedures 50 ADA400A Differential Preamplifier...

Page 63: ...ktronix service center Include the following information name of purchaser return address name and phone number of a person that Tektronix may contact date of purchase and a description of the defect...

Page 64: ...e circuit board Handle the circuit board by the edges If the circuit board is contaminated wash the board with Isopropyl Alcohol and rinse with warm deionized water Replacement Procedures Refer to the...

Page 65: ...ly pull the interface collar off To replace the collar first note the pin configuration in the interface collar The group of three pins fit through the smaller of the two holes in the interface collar...

Page 66: ...loosen the set screws on the COARSE and FINE controls and remove the knobs 2 Remove the four screws that hold the top housing separate the top housing from the bottom housing and set the top housing t...

Page 67: ...A400A Differential Preamplifier replace the cable assembly as follows 1 Remove the remaining two screws that hold the circuit board to the bottom housing NOTE To prevent contaminating sensitive areas...

Page 68: ...ate the functional blocks that the controls affect 1 M 1 Select High Z Attenuator 1 1 1 100 Input Coupling Input Protection Scale Factor Coding Signal Out 5V Ground Output Cable TEKPROBE Interface Osc...

Page 69: ...0 attenuation in the low impedance attenuator The lowest gain setting for example selects the highest total amount of attenuation The offset controls adjust the DC component of the input signal To kee...

Page 70: ...ssembly Intermittent or difficult positioning Defective position controls Replace position control s No signal output to cable assembly interface power is present and fuses are not blown Faulty module...

Page 71: ...strument serial number H Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative w...

Page 72: ...al number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers 5 Qty This indic...

Page 73: ...857 OLD TRAIL RD ETTERS PA 17319 32997 BOURNS INC TRIMPOT DIV 1200 COLUMBIA AVE RIVERSIDE CA 92507 2114 61935 SCHURTER INC 1016 CLEGG COURT PETALUMA CA 94952 1152 71400 BUSSMANN DIV OF COOPER INDUSTRI...

Page 74: ...OF 22 9 22526 65474 006 13 220 0497 00 2 NUT PLAIN HEX 0 5 28 X 0 562 HEX BRS CD PL 73743 ORDER BY DESC 14 210 0986 00 2 WASHER FLAT 0 5 ID X 0 672 OD X 0 035 STL CD PL 80009 210098600 15 211 0711 00...

Page 75: ...Replaceable Parts ADA400A Differential Preamplifier 63 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 5 6 15 16 17 18 19 20 21 22 23 24 Figure 22 ADA400A Differential Preamplifier Exploded View...

Page 76: ...Replaceable Parts 64 ADA400A Differential Preamplifier...

Page 77: ...fied frequency down to DC or 0 Hz Common mode Signals on both preamplifier inputs that are identical in voltage and phase Common Mode Rejection Ratio CMRR The extent to which a differential amplifier...

Page 78: ...e in amplitude between the maximum value and the average or mean value of a waveform Peak to Peak Amplitude measurement of the absolute difference between the maximum and minimum amplitude Period A ti...

Page 79: ...llustrated 8 Contacting Tektronix viii controls offset 18 57 overview 7 10 cover procedure for removing 54 D diagnostic procedures 58 E effective volts division 10 electrostatic discharge preventing 5...

Page 80: ...ures performance verification 29 Product support contact information viii R repackaging 58 replacement procedures 52 S safety general summary v scale factor coding 57 Service support contact informati...

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