Stanford Research Systems SIM983 Operation And Service Manual Download Page 69 | Manualshive

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Summary of Contents for SIM983

Page 1: ...Operation and Service Manual Scaling Amplifier SIM983 Stanford Research Systems Revision 2 2 August 28 2006...

Page 2: ...t 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 this...

Page 3: ...1 2 1 Signal Connections and Grounding 2 2 2 2 Autocalibration 2 2 2 3 AC Characteristics 2 3 2 4 Clock Stopping 2 4 3 Remote Operation 3 1 3 1 Index of Common Commands 3 2 3 2 Alphabetic List of Comm...

Page 4: ...ii Contents A Index A 1 SIM983 Scaling Amplifier...

Page 5: ...input front panel output and the rear panel output coaxial BNC connectors in the SIM983 are referenced to the Earth and their outer casings are grounded No dangerous voltages are generated by the mod...

Page 6: ...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 supp...

Page 7: ...s gain gain is shorthand for gain gain Front panel indicators are set as OVLD Signal names are set as STATUS Signal levels are set as HIGH Remote command names are set as IDN Literal text other than c...

Page 8: ...Stability 10 ppm C Offset 3 Voltage 10 00 10 00 V Resolution Vofs 1 999 V 1 mV Vofs 2 00 V 10 mV Accuracy 2 4 6 1 200 mV ppm Stability 4 20 20 V ppm C Settling time 7 2 s AC 3 dB bandwidth G 1 00 2 0...

Page 9: ...n applies to the output referred noise and offset 5 Amphenol 31 10 4052 or similar 6 Following an autocalibration at 23 5 C within 24 hours following a 2 hour warmup 7 To within 0 1 of the final value...

Page 10: ...viii General Information SIM983 Scaling Amplifier...

Page 11: ...1 1 Introduction to the Instrument 1 2 1 1 1 Front and rear panels 1 3 1 2 Front Panel Operation 1 3 1 2 1 Polarity 1 3 1 2 2 Gain 1 3 1 2 3 Offset 1 4 1 2 4 Overload 1 4 1 3 Connections 1 5 1 4 Power...

Page 12: ...fier s high slew rate allows it to output a 10 V peak peak sine wave at a frequency of 1 MHz The gain stage of the amplifier AC performance is compensated in a flexible fashion to provide a sensible p...

Page 13: ...simultaneous press of polarity and one of gain has a special meaning This press initiates autocalibration Section 2 2 1 2 2 Gain The gain G can be set to an absolute value between 0 01 and 19 99 To ra...

Page 14: ...absolute value Thus for example pressing offset when Vofs 5 49 V makes Vofs 5 48 V If offset is pressed when Vofs 10 00 V the press has no effect If offset is pressed when Vofs 10 00 V the press has...

Page 15: ...imits To distinguish between the two input overload possibilities use the command OVLD The overload LED stays on for a minimum of 50 ms after this time it turns off if the overload condition has cease...

Page 16: ...ration of the remote interface is detailed in Section 3 3 1 1 5 Restoring the Default Configuration The default configuration of the SIM983 is G 1 00 Vofs 0 000 V and bandwidth 0 see Section 2 3 1 Thi...

Page 17: ...nnection in SIM983 6 5V MF SIM Power supply no connection in SIM983 7 15V MF SIM Power supply 8 PS RTN MF SIM Ground Reference 2 9 CHASSIS GND Chassis ground 10 TXD MF SIM Async data start bit 0 5 V 1...

Page 18: ...TS 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 personal computers a cable must be made with a female DB...

Page 19: ...hrough back to back Schottky diodes so they cannot be more than 0 35 V apart The three ground lines should be separately wired to a single low impedance ground source at the power supply 1 6 2 2 Seria...

Page 20: ...1 10 Getting Started SIM983 Scaling Amplifier...

Page 21: ...ditional details of the operation of the SIM983 In This Chapter 2 1 Signal Connections and Grounding 2 2 2 1 1 Output drive 2 2 2 1 2 Grounds 2 2 2 2 Autocalibration 2 2 2 3 AC Characteristics 2 3 2 3...

Page 22: ...t of the amplifier returns to the power supply through Ground 2 The outer casing of the rear panel output BNC is connected to chas sis ground Pin 9 of the DB 15 SIM interface connector The sepa rate p...

Page 23: ...f 3 dB G 1 00 The gain bandwidth product is determined by a compensation ca pacitor in the feedback path of the gain stage amplifier It is possible to override the value of this capacitor giving the...

Page 24: ...A power on 2 A press of a front panel button 3 Activity send or receive at the remote interface 4 An overload The clock runs for as long as is necessary to complete a gain or offset adjustment or to...

Page 25: ...xamples 3 8 3 4 4 General commands 3 9 3 4 5 Configuration commands 3 10 3 4 6 Calibration commands 3 11 3 4 7 Status commands 3 11 3 4 8 Interface commands 3 14 3 4 9 Serial communication commands 3...

Page 26: ...10 Keep Clock Awake Configuration GAIN f 3 10 Gain OFST f 3 10 Offset BWTH m 3 11 Bandwidth Calibration ACAL 3 11 Autocalibration Status CLS 3 11 Clear Status STB i 3 12 Status Byte SRE i j 3 12 Servi...

Page 27: ...5 Operation Complete CONS z 3 15 Console Mode LEXE 3 16 Execution Error LCME 3 16 Command Error LDDE 3 17 Device Error TOKN z 3 17 Token Mode TERM z 3 17 Response Termination Serial Communications PAR...

Page 28: ...Self Test A ACAL 3 11 Autocalibration AWAK z 3 10 Keep Clock Awake B BWTH m 3 11 Bandwidth C CESE i j 3 13 Communication Error Status Enable CESR i 3 12 Communication Error Status CONS z 3 15 Console...

Page 29: ...3 2 Alphabetic List of Commands 3 5 P PARI z 3 18 Parity PSTA z 3 13 Pulse STATUS Mode T TERM z 3 17 Response Termination TOKN z 3 17 Token Mode SIM983 Scaling Amplifier...

Page 30: ...e command descriptions 3 3 2 Buffers The SIM983 stores incoming bytes from the host interface in a 64 byte input buffer Characters accumulate in the input buffer until a command terminator either hCRi...

Page 31: ...are always required Do not send or or as part of the command Multiple parameters are separated by commas Multiple commands may be sent on one command line by separating them with semi colons so long...

Page 32: ...eries var Optional parameter for both set and query forms 3 4 3 Examples Each command is provided with a simple example illustrating its usage In these examples all data sent by the host computer to t...

Page 33: ...ays required the brackets themselves should not be sent General commands HELP Send this text AWAK z Keep the module clock awake Configuration commands GAIN f Set query gain OFST f Set query offset BWT...

Page 34: ...nly enabled during processing of events Section 2 4 Setting AWAK ON forces the clock to stay running and is useful only for diagnostic purposes AWAK ON Example 3 4 5 Configuration commands Gain GAIN f...

Page 35: ...s also automatically selected from this table if the optional parameter is omitted GAIN 17 BWTH 1 BWTH Example 1 GAIN 17 BWTH 3 3 4 6 Calibration commands Autocalibration ACAL Perform a self calibrati...

Page 36: ...ice Request Enable register Bit i to j SRE 0 1 Example Standard Event Status ESR i Query the Standard Event Status Register Bit i Upon execution of ESR the returned bit s of the ESR register are clear...

Page 37: ...STATUS Mode PSTA z Set query the Pulse STATUS mode to z OFF 0 ON 1 When PSTA ON is set all new service requests will only pulse the STATUS signal LOW for a minimum of 1 s The default behavior is to l...

Page 38: ...s in OLSR However once cleared by OLSR or CLS the overload status bits will stay cleared even though the overload condition may persist and remain reported by OVLD OVLD Example 6 implies that the inpu...

Page 39: ...test in the SIM983 after the power on so this query always returns 0 TST Example 0 Operation Complete OPC Sets the OPC flag in the ESR register The query form OPC writes a 1 into the output queue when...

Page 40: ...7 The second read of LEXE returns 0 Command Error LCME Query the Last Command Error code A query of LCME always clears the error code so a subsequent LCME will return 0 Valid codes are Value Definiti...

Page 41: ...Thus the only possible responses to the TOKN query are ON and 0 TOKN OFF Example Response Termination TERM z Set query the htermi sequence to z NONE 0 CR 1 LF 2 CRLF 3 or LFCR 4 The htermi sequence i...

Page 42: ...3 18 Remote Operation Parity PARI z Set query the parity to z NONE 0 ODD 1 EVEN 2 MARK 3 SPACE 4 The value in boldface is the power on value TOKN ON PARI Example EVEN SIM983 Scaling Amplifier...

Page 43: ...tatus X X X X X 2 1 0 X X X X X 2 1 0 Input Input Offset undef undef undef undef undef Output OLSR OLSE Overload Status STATUS Figure 3 1 Status register model for the SIM983 Scaling Amplifier There a...

Page 44: ...ndard Event Status Register is true MSS Master Summary Status Indicates whether one or more of the enabled status messages in the Status Byte register is true CESB Communication Error Summary Bit Indi...

Page 45: ...es that a front panel button was pressed PON Power On Indicates that an off to on transition has occurred 3 5 4 Standard Event Status Enable ESE The ESE acts as a bitwise AND with the ESR register to...

Page 46: ...TSH CTS Holdoff Event Unused in the SIM983 DCAS Device Clear Indicates that the SIM983 received the Device Clear signal an RS 232 hbreaki Clears the input buffer and the output queue and resets the co...

Page 47: ...overload bits that are set If the overload condition persists the bits will remain cleared until the overload condition ceases and reoccurs Use OVLD to query the current state of the overload 3 5 8 Ov...

Page 48: ...3 24 Remote Operation SIM983 Scaling Amplifier...

Page 49: ...the DC Accuracy 4 2 4 1 1 Getting ready 4 2 4 1 2 Interpreting the accuracy specifications 4 2 4 1 3 Input bias current 4 4 4 2 Verifying AC Performance 4 4 4 2 1 Transfer characteristic 4 4 4 2 2 St...

Page 50: ...o the voltage source must be stable within the voltmeter s accuracy No such stability is required if two voltmeters are used 1 Warm up the SIM983 for at least 2 hours 2 If the voltmeter requires a war...

Page 51: ...V andVofs 5 480 V performedatalaboratorytemperatureof 23 C For G 1 the specified offset error term is referenced to the output according to Note 4 on Page vii The worst case error budget is Specifica...

Page 52: ...or with at most 25 ns square wave rise time such as the Stanford Research Systems DS345 and an oscilloscope with at least 100 MHz bandwidth An FFT spectrum analyzer such as the Stanford Research Syste...

Page 53: ...ponse of the SIM983 to a 1 0 V peak peak step G 1 00 Vofs 0 000 V TDS 3034 28 Apr 2006 11 39 28 Figure 4 2 Response of the SIM983 to a 1 0 V peak peak step G 4 00 Vofs 0 000 V TDS 3034 28 Apr 2006 11...

Page 54: ...V s 4 2 4 Total harmonic distortion Figure 4 7 shows a distortion measurement made on the SR785 FFT Spectrum Analyzer 4 3 Noise Characteristics Figure 4 8 shows noise plots of the SIM983 up to f 100 k...

Page 55: ...cipal The total THD for 10 harmonics is 96 dB as measured by an SR785 The THD does not degrade with higher gain or larger input signal up to the overload limits of the SIM983 10 0 10 1 10 2 10 3 10 4...

Page 56: ...ance Test Record 4 4 1 DC test Serial number Lab temperature C G Vin Vofs Vout G Error Gain Gain Offset Offset Cal V V V Vin Vofs V accuracy stability accuracy stability within V error V error V error...

Page 57: ...4 4 Performance Test Record 4 9 4 4 2 Noise test Serial number Input bias current pA Noise volage nV Hz G 0 10 G 0 10 G 1 00 G 1 00 G 19 99 G 19 99 f 1 kHz f 10 kHz SIM983 Scaling Amplifier...

Page 58: ...4 10 Performance Verification SIM983 Scaling Amplifier...

Page 59: ...of the SIM983 circuit design A complete parts list and circuit schematics are included In This Chapter 5 1 Circuit Discussion 5 2 5 1 1 Microcontroller interface 5 2 5 1 2 The amplifier 5 2 5 1 3 Fro...

Page 60: ...pending activity it drives the STOP signal HIGH Pin 71 of U107 effectively halting its own processor clock In this way the SIM983 guarantees that no digital clock artifacts can be generated during qui...

Page 61: ...istance of U204 in combination with C206 with f 3 dB 11 Hz 5 1 2 3 Summing amplifier The voltages at the outputs of the input buffer and the two offset generating DACs are combined by a summing amplif...

Page 62: ...ad by comparator U214 triggered at the voltage limits discussed in Sec tion 1 2 4 1 5 1 2 5 Gain stage The variable gain element is one half of high speed op amp U211 connected in the inverting config...

Page 63: ...of the analog switches3 that configure the variable resistance MDAC add together at the output of the MDAC This ca pacitance becomes the input capacitance of the inverting amplifier and its value pla...

Page 64: ...ifier Circuit Board 1 of 1 Revision D BILL OF MATERIALS May 5 2006 Item Qty Reference Part SRS P N Manufacturer Manf P N 1 2 C101 C102 22 T 5 00327 030 VISHAY 199D226X9035E6B1 2 10 C103 C110 C111 C205...

Page 65: ...11 28 1 L201 1 2 5 500mA 6 00676 100 API DELEVAN 1210 122J 29 0 MH101 MH102 MH103 MH104 Mounting Hole no part 30 2 Q201 Q202 Q203 MMBF4416 3 01324 152 VISHAY SST4416 31 1 Q204 MMBT2907A 3 00927 150 ON...

Page 66: ...1 R221 10 0 4 00925 110 VENKEL TRN55CF 10R0TR 63 1 R225 10 0k 4 01213 110 VENKEL TRN55CF 1002TR 64 1 R226 2 00k 4 01146 110 VENKEL TRN55CF 2001TR 65 1 R228 35 7 2W flameproof 4 01735 000 VISHAY CPF235...

Page 67: ...n Cap 0 00996 999 OMRON B32 1000 105 4 no designator 4 40x1 4 Pan Phil 0 00187 999 ACF PPM 04C04 0 Z 106 4 no designator 4 Split Washer 0 00096 999 J M 4NLOCLZ 107 2 no designator 4 40x3 8 Flat Phil 0...

Page 68: ...5 10 Circuit Description 5 3 Schematic Diagrams Circuit schematic diagrams follow this page SIM983 Scaling Amplifier...

Page 69: ...4 9 8 R104 3 9k MH104 J102 Header 0 100 4 1 1 2 3 4 U102A 74HC74 2 3 5 6 4 1 D CLK Q Q PR CL U106 MAX6348 4 4V 3 2 1 VCC RESET GND X114 0 1 R111 100k 5 R102 1 0k R115 100k 5 U108F 74HC14 13 12 R114 10...

Page 70: ...3 2 1 R232 365k C225 10 T D201 TL431CDBV 5 3 4 R261 4 7k U214B LM393 5 6 7 X214 0 1 L201 1 2 500 mA 5 U201A AD8510A 2 3 6 R245 2 4M R217 604 0 5 ppm K C222 10 T C224 10 T C226 10 T R257 249 C R222 1...

Page 71: ...1 8 R305B 4 7k 4 D 2 7 R307D 4 7k 4 D 4 5 U305 74HC595A 14 11 10 12 13 15 1 2 3 4 5 6 7 9 16 8 SI SCK SCLR RCK G QA QB QC QD QE QF QG QH QH VCC GND R311C 4 7k 4 D 3 6 R311A 4 7k 4 D 1 8 R312C 4 7k 4...

Page 72: ...16 3 21 parameters 3 7 3 16 separator 3 7 terminator 3 6 7 3 14 3 17 Compensation 2 3 4 4 5 5 Console mode 3 6 3 14 15 DB 15 1 7 8 2 2 DB 9 female 1 8 male 1 8 Default configuration see Reset Device...

Page 73: ...istance vi 2 2 voltage iii 1 8 limits vi 1 5 2 3 5 5 maximum undistorted sine wave 1 2 2 3 voltage buffer 5 5 Output queue 3 6 3 15 3 21 22 Overload 1 2 1 4 2 4 3 14 4 2 input vii 1 2 1 5 3 14 3 22 5...

Page 74: ...et stability Status 3 11 3 19 registers 3 11 3 19 CESE 3 12 3 22 CESR 3 6 3 12 3 20 22 ESE 3 12 3 14 3 21 ESR 3 6 3 12 3 15 3 20 OLSB 3 20 OLSE 3 13 14 3 23 OLSR 3 13 14 3 22 23 SB 3 12 3 20 23 SRE 3...

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