Stanford Research Systems BJT SIM911 Operation And Service Manual Download Page 34

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4 – 4

Circuitry

4.2

Parts List

Reference

SRS P/N Part Value

Reference

SRS P/N Part Value

C103,C109,C111,C113,C202,

5-00319

10U-35V

R125

4-01134

1.50K

C204,C206,C208,C213,C215,

R126,R127,R205,R206,R212,

4-01431

C217,C219,C404,C406,C408

R213,R221,R222,R223,R224

C104,C106,C108,C110,C112,

5-00299

0.1U

R128,R129

4-00142

100K

C116,C117,C201,C203,C205,

R130,R131,R412,R414

4-01455

100

C207,C212,C214,C216,C218,

R132,R302,R303,R304,R305,

4-01471

470

C403,C405,C407,C411,C412,

R306,R307,R308,R309,R310,

C413,C414,C415,C416

R311,R315

C107,C114

5-00369

33P

R201,R207

4-00528

499.0

C115

5-00361

6.8P

R202,R208

4-01656

301.0

C191,C192

5-00245

1.0U

R203,R204,R211

4-00685

100.0

C209,C220

5-00363

10P

R209

4-01657

48.70

C211,C210

5-00375

100P

R210

4-01658

52.30

C221

5-00372

56P

R214

4-00987

44.2

C301

5-00298

0.01U

R215

4-00353

100.

C401

5-00381

330P

R216

4-01084

453

C402

5-00106

9.0-50P

R219

4-01041

162

C409,C410

5-00387

1000P

R225

4-00913

49.9-2W

D102,D101

3-01400

BAV199W

R232,R235,R236

4-01274

43.2K

D401

3-00945

BAT54S

R233,R234,R237

4-01318

124K

D501,D502,D503,D504,D507,

3-00424

LED

R240

4-01018

93.1

D509,D510,D511,D512,D515

R241

4-00988

45.3

D508

3-00425

LEDRED

R301,R316,R402,R405,R407,

4-01527

100K

D514,D513

3-00426

YELLOW

R409,R410,R415

J101,J102,J201,J202

1-00003

BNC

R314,R401,R406,R408,R417

4-01503

10K

J301

1-00609

HEADER 22

R403

4-01479

1.0K

J401

1-00367

DB15

R404

4-01083

442

J501

1-00610

HEADER 22

R413,R411

4-01465

270

K101,K102,K103,K104

3-01401

DS2E-ML-DC5V

S501,S502,S503,S504,S505

2-00053

L401,L402,L403

6-00174

BEAD

TVS101

3-01402

LCDA05

Q102

3-00231

MAT02

U101

3-00542

AD587JR

Q301

3-00580

MMBT3906

U103

3-01398

OPA2131

R101,R102,R108

4-01213

10.0K

U202

3-01426

AD797

R103,R104

4-00925

U204

3-01360

OPA228UA

R238

4-01021

100

U106

3-01403

OPA2130UA

R105

4-01251

24.9K

U107,U208

3-00727

LM339

R106,R226,R227,R228,R229,

4-01280

49.9K

U201,U203

3-01358

DG444

R230,R231

U105,U206

3-00998

OPA227UA

R107

4-01687

2.0K

U207

3-00279

LT1010CN8

R109

4-01120

1.07K

U209

3-00728

LM393

R217,R218,R220

4-01096

604

U302,U301

3-00787

74HC595

R110,R111

4-01098

634

U401

3-00903

MAX6348UR44

R112,R113

4-01367

402K

U402

3-00663

74HC08

R117,R114

4-01088

499

U403

3-00742

74HC74

R116,R115

4-00991

48.7

U404

3-01405

74AC00

R118,R119

4-01611

8.25

U405

3-01406

68HC705C8A

R120

4-00486

50.0

U406

3-01407

93AA56

R122,R121

4-01355

301K

U407

3-00662

74HC14

4.3

Schematic Diagrams

Schematic diagrams follow this page.

SIM911

BJT Preamp

Summary of Contents for BJT SIM911

Page 1: ...Operation and Service Manual BJT Preamp SIM911 Stanford Research Systems Revision 2 1 May 8 2007...

Page 2: ...must be returned to a Stanford Research Systems authorized service facility Contact Stanford Research Systems or an authorized representative before returning this product for repair Information in th...

Page 3: ...tput 1 5 1 4 SIM Interface 1 6 2 Remote Operation 2 1 2 1 Index of Common Commands 2 2 2 2 Alphabetic List of Commands 2 3 2 3 Introduction 2 4 2 4 Commands 2 5 2 5 Register Model 2 9 3 Performance Te...

Page 4: ...ii Contents SIM911 BJT Preamp...

Page 5: ...ct grounding com WARNING ponent failure and excessive common mode input voltages are ex amples of conditions in which the instrument may expose the subject to large input currents Therefore Stanford R...

Page 6: ...may Find on SRS Products Symbol Description Alternating current Caution risk of electric shock Frame or chassis terminal Caution refer to accompanying documents Earth ground terminal Battery Fuse On s...

Page 7: ...e instructions WARNING are not obeyed A caution means that damage to the instrument or other equipment CAUTION is possible Front panel buttons are set as Button Adjust is shorthand for Adjust Adjust F...

Page 8: ...A B GND Input coupling AC or DC Input shields Floating or ground Maximum input differential 1 V before overload Maximum input common mode 5 V clamped at 6 V Maximum output voltage 10 V before overloa...

Page 9: ...necessary information to get started quickly with the SIM911 In This Chapter 1 1 Instrument Overview 1 2 1 2 Front Panel Operation 1 2 1 2 1 Gain 1 3 1 2 2 Offset 1 3 1 2 3 Overload 1 3 1 2 4 Inputs 1...

Page 10: ...liminated by only clocking the microprocessor when settings are being changed The complete amplifier configuration i e gain settings coupling etc is saved in non volatile memory The front end amplifie...

Page 11: ...g Gain or Gain in the GAIN block on the upper right of the module The change is reflected in the LEDs to the left of the buttons Pushing Gain when on gain 100 produces no effect Pushing Gain when on g...

Page 12: ...The maximum signal voltage is 1 V while the maximum common mode voltage is 5 V Exceeding these limits will cause OVLD to light up When the Ground input is selected the user inputs A B are left floatin...

Page 13: ...e output and the SIM interface connector see Figure 1 2 The rear panel output is wired in parallel to the front panel output The output is not designed to drive 2 simultaneous 50 loads If one output i...

Page 14: ...d in Table 1 1 Direction Pin Signal Src Dest Description 1 SIGNAL GND MF SIM Ground reference for signal 2 STATUS SIM MF Status service request GND asserted 5 V idle 3 RTS MF SIM HW Handshake 5 V talk...

Page 15: ...the PC TXD directly to TD and similarly RTS RTS and CTS CTS In other words a null modem style cable is not needed To interface directly to the DB 9 male DTE RS 232 port typically found on contemporary...

Page 16: ...d Power Ground are tied through protection schot tky diodes and can therefore not be more than 0 35 V apart These two ground lines should be separately wired back to a single low impedance ground sour...

Page 17: ...Commands 2 3 2 3 Introduction 2 4 2 3 1 Power on configuration 2 4 2 3 2 Buffers 2 4 2 3 3 Device Clear 2 4 2 4 Commands 2 5 2 4 1 Command syntax 2 5 2 4 2 Notation 2 5 2 4 3 Examples 2 5 2 4 4 Amplif...

Page 18: ...rameter for set commands illegal for queries Amplifier RST 2 6 Reset GAIN i 2 6 Gain COUP i 2 6 Coupling INPT i 2 6 Input SHLD i 2 6 Shield Status STB 2 7 Status Byte SRE i 2 7 Service Request Enable...

Page 19: ...8 Identify RST 2 6 Reset SRE i 2 7 Service Request Enable STB 2 7 Status Byte TST 2 8 Self Test C CONS i 2 8 Console Mode COUP i 2 6 Coupling G GAIN i 2 6 Gain I INPT i 2 6 Input O OVLD 2 7 Overload...

Page 20: ...oldface 2 3 2 Buffers Incoming data from the host interface is stored in a 32 byte input buffer Characters accumulate in the input buffer until a command terminator either hCRi or hLFi is received at...

Page 21: ...hout any surrounding characters are always required Do not send or as part of the command Multiple parameters are separated by commas Commands are ter minated by either hCRi or hLFi characters Null co...

Page 22: ...ounded shield floated RST Example Gain GAIN i Set query the amplifier gain to i 1 2 5 10 20 50 100 GAIN Example 50 Coupling COUP i Set query the amplifier input coupling COUP 1 sets AC coupling while...

Page 23: ...le Status Monitors Overload STOL i Set query the Status Monitors Overload mode to i 0 1 STOL 1 causes the STATUS signal pin 2 on J401 Dsub 15 connec tor to become a real time monitor of the amplifier...

Page 24: ...N VER where is the 6 digit serial number and is the firmware revision level IDN Example Stanford Research Systems SIM911 s n003654 ver2 10 Self Test TST Query the device self test The SIM911 does not...

Page 25: ...es it to be cleared Weight Bit Flag 1 0 EXE 2 1 CMD 4 2 QRE 8 3 OVR 16 4 SERR 32 5 URQ 64 6 DCAS 128 7 OVLD EXE Execution Error Indicates an error in a command that was successfully parsed Out of rang...

Page 26: ...n the SRE corresponds one to one with a bit in the SB register and acts as a bitwise AND of the SB flags If any bits are simultaneously set in both the SB and the SRE then a service request is indicat...

Page 27: ...he module should be warmed up for at least 15 minutes before making any adjustments In This Chapter 3 1 Offset 3 2 3 2 Calibration 3 2 3 2 1 Adjusting the CMRR 3 2 3 2 2 Adjusting the gain 3 2 3 2 3 A...

Page 28: ...be running for at least 15 minutes before doing any adjustments 3 2 1 Adjusting the CMRR The common mode adjustment minimizes the common mode re sponse of the amplifier by balancing the two sides of t...

Page 29: ...requency at the test point 2 5 MHz 3 3 Performance Tests The following curves are typical noise density vs frequency for the SIM911 10 0 10 1 10 2 10 3 10 4 10 5 1 10 Frequency Hz Voltage Noise nV Hz...

Page 30: ...ommunication connector pin specifications 3 4 SIM911 Performance Test Record Description Measured Value Serial Number Clock Frequency at TP401 Gain 1 Gain 2 Gain 5 Gain 10 Gain 20 Gain 50 Gain 100 CMR...

Page 31: ...911 circuit design A complete parts list and circuit schematics are included In This Chapter 4 1 Circuit Discussion 4 2 4 1 1 Input amplifier and protection circuitry 4 2 4 1 2 Programmable gain stage...

Page 32: ...cision divider ladders R201 R204 and R207 R211 provide programmable gain steps without introducing excessive noise at lower gains Gain allocations are noted on the schematic indicating which switches...

Page 33: ...art time of the RC oscillator ensures that incoming se rial data will be correctly decoded by the microcontroller s UART even when the clock is started by the serial start bit of the incoming data Whe...

Page 34: ...D515 R241 4 00988 45 3 D508 3 00425 LEDRED R301 R316 R402 R405 R407 4 01527 100K D514 D513 3 00426 YELLOW R409 R410 R415 J101 J102 J201 J202 1 00003 BNC R314 R401 R406 R408 R417 4 01503 10K J301 1 00...

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