Stanford Research Systems SIM918 Page 53 Operating And Service Manual Download

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3.4

Commands

3 – 21

Execution Error

LEXE?

Query the Last Execution Error code. A query of

LEXE?

always

clears the error code, so a subsequent

LEXE?

will return

. Valid

codes are:

Value

Definition

No execution error since last

LEXE?

Illegal value

Wrong token

Invalid bit

Reference clock inactive

*STB? 12; LEXE?; LEXE?

Example:

3
0

The error (3, ”Invalid bit”) is because

*STB?

only allows bit-specific

queries of 0–7. 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

. Valid

codes are:

Value

Definition

No command error since last

LCME?

Illegal command

Undefined command

Illegal query

Illegal set

Missing parameter(s)

Extra parameter(s)

Null parameter(s)

Parameter bu

er overflow

Bad integer

Bad integer token

Bad token value

Unknown token

*IDN

Example:

LCME?

The error (4, ”Illegal set”) is due to the missing “

”.

SIM918

Precision Current Preamplifier

Summary of Contents for SIM918

Page 1: ...Operation and Service Manual Precision Current Preamplifier SIM918 Stanford Research Systems Revision 1 8 December 13 2006 ...

Page 2: ...e 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 document is subject to change without notice Copyright c Stanford Research Systems Inc 2006 All rights reserved Stanford Research Systems Inc 1290 D Reamwood Avenue Sunnyvale CA 94089 USA Phone 408 744 9...

Page 3: ... 1 9 1 6 SIM Interface 1 10 2 Description of Operation 2 1 2 1 About Transimpedance Amplifiers 2 2 2 2 Bias and Ground 2 4 2 3 Output 2 5 2 4 Autozero Trim 2 5 2 5 Phase Locked Loop 2 6 2 6 Autocalibration 2 6 2 7 Clock Stopping 2 7 2 8 Quiescent Operation 2 8 3 Remote Operation 3 1 3 1 Index of Common Commands 3 2 3 2 Alphabetic List of Commands 3 4 3 3 Introduction 3 6 3 4 Commands 3 7 3 5 Statu...

Page 4: ...ii Contents SIM918 Precision Current Preamplifier ...

Page 5: ...he outer shield of the front panel Input coaxial BNC connector in the SIM918 can be switched to the rear panel Program input If a dangerous voltage is applied to the Program terminal it may be present on the outer shell of the Input connector and may cause injury or death Do not exceed 60 volts to the Earth at the center terminal of the rear panel WARNING Shield Program Voltage BNC connector Do no...

Page 6: ...is cable is connected to the curent input of the SIM918 the stored charge may damage the front end JFET To avoid this problem provide a leakage path of about 100 kΩ to ground inside the base of the PMT to prevent charge accumulation Service Do not install substitute parts or perform unauthorized modifications to this instrument Preparation for use The SIM918 is a single wide module designed to be ...

Page 7: ...General Information v SIM918 Precision Current Preamplifier ...

Page 8: ...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 supply Off supply SIM918 Precision Current Preamplifier ...

Page 9: ...IN 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 command names is set as OFF Special ASCII characters are set as hCRi Remote command examples will all be set in monospaced font In these examples data sent by the host computer to the SIM918 are set as str...

Page 10: ...5 106 V A 130 fA Hz 107 V A 42 fA Hz 108 V A 15 fA Hz Voltage noise 1 4 25 µV rms 3 dB bandwidth 5 106 V A 22 kHz 107 V A 12 kHz 108 V A 4 kHz Terminals Isolated BNC 6 BNC shield Ground bias program open Bias input Selection On ground Voltage 7 5 0 5 0 V Resistance 10 MΩ 3 dB bandwidth 0 2 Hz Terminals Isolated BNC 6 BNC shield Ground float Program input Voltage 60 60 V Resistance 3 GΩ Terminals G...

Page 11: ...ce Higher values of source capacitance or a finite source resistance will degrade these specifications 6 Amphenol 31 10 4052 or similar 7 An overload will be detected and the instrument is not guaranteed to perform properly if these limits are exceeded or if Vbias iin RF exceeds the limits Continuous application of a bias voltage Vbias in excess of 15 V will damage the instrument 8 Tyco 227169 4 o...

Page 12: ...x General Information SIM918 Precision Current Preamplifier ...

Page 13: ...1 2 1 1 3 Cabling and grounding 1 3 1 1 4 Autocalibration 1 3 1 1 5 Remote interface and status 1 3 1 1 6 Block diagram 1 4 1 1 7 Front and rear panels 1 5 1 2 Front Panel Operation 1 5 1 2 1 Gain 1 5 1 2 2 Autozero 1 5 1 2 3 Input 1 7 1 2 4 Bias 1 7 1 2 5 Output overload 1 8 1 3 Connections 1 8 1 4 Power On 1 9 1 5 Restoring the Default Configuration 1 9 1 6 SIM Interface 1 10 1 6 1 SIM interface...

Page 14: ... necessary to keep the offset voltage at zero The autozero feature can be engaged or inhibited remotely or from the front panel giving the user flexibility in sensitive applications With autozero inhibited the preamplifier retains microvolt input accuracy for many hours When engaged it takes the autozero only a few cycles of a reference clock to restore the offset to within its specified limits Th...

Page 15: ...maximum flexibility for cabling and ground ing The input connection can be opened and the bias voltage can be connected to signal ground The shield of the Input BNC can be switched between signal ground the bias voltage or the rear panel Program input which can be left floating if desired With the Program input a user can supply an excitation potential to an experiment via the shield conductor of ...

Page 16: ...the overload or unlocked condition 1 1 6 Block diagram The output of the main amplifier transimpedance stage is refer enced to the bias voltage A difference amplifier subtracts the bias voltage so the output of the instrument is directly proportional to the input current iin and the gain RF Vout Vbias iin RF Vbias iin RF 1 1 A block diagram of the preamplifier is shown below in Figure 1 1 LPF 0 5 ...

Page 17: ... effect If GAIN is pressed when RF 100 V µA the press has no effect A simultaneous press of GAIN has a special meaning This press initiates autocalibration Section 2 6 1 2 2 Autozero 1 2 2 1 Engaging the autozero circuit The autozero circuit is turned ON by the press of a front panel button There will be a pause of up to 3 3 seconds a wait for a positive going edge of the reference clock At the en...

Page 18: ...acquisition time ically takes 250 s just over 4 minutes to acquire a lock The yel low Unlocked LED is illuminated whenever the SIM918 is not in a locked state For further discussion of locking see Chapter 2 5 For the duration of an unlocked state the switches in the autozero circuit are not guaranteed to have correct duty cycles Therefore the specified input offset accuracy is not guaranteed while...

Page 19: ...nter terminal of the Bias BNC and the signal ground of the instrument If the bias source is set to ground the green BIAS GND light is on With Bias grounded the difference amplifier Figure 1 1 is switched out and the output of the instrument is taken directly from the trans impedance stage With this configuration there is no common mode error and the output offset error is reduced When Bias is conn...

Page 20: ...raw output of the transimpedance stage Vbias iin RF exceeds these limits To distinguish between the two output over load possibilities use the OVLD query The overload LED stays on for a minimum of 50 ms after this time it turns off if the overload condition has ceased 1 3 Connections There are five BNC connectors in the SIM918 three on the front panel and two at the rear Panel BNC Terminal Signal ...

Page 21: ...efault Configuration The default configuration of the SIM918 is 1 Gain 106 V A 2 Autozero on 3 Input connected 4 Input shield at ground 5 Bias at ground 6 Bias shield at ground 7 Reference clock direction is input 8 The phase locked loop Section 2 5 is inactive when autozero is off To reset the module into this configuration turn the SIM900 Main frame power on while holding a front panel button of...

Page 22: ...connection in SIM918 6 5V MF SIM Power supply no connection in SIM918 7 15V MF SIM Power supply 8 PS RTN MF SIM Power ground 9 CHASSIS GND Chassis ground 10 TXD MF SIM Async data start bit 0 5 V 1 GND 11 RXD SIM MF Async data start bit 0 5 V 1 GND 12 REF 10MHZ MF SIM 10 MHz reference no connection in SIM918 13 5V MF SIM Power supply 14 15V MF SIM Power supply 15 24V MF SIM Power supply no connecti...

Page 23: ...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 15 socket to mate with the SIM918 and a female DB 9 socket to mate with the PC s serial port Separate leads from the DB 15 need to go to the power supply making what is sometimes know as a hydra cable The pin connecti...

Page 24: ...ower Ground are connected through back to back Schottky diodes so they cannot be more than 0 35 V apart The three ground lines should be sepa rately wired to a single low impedance ground source at the power supply 1 6 2 2 Serial settings The initial serial port settings at power on are baud rate 9600 8 bits no parity 1 stop bit and no flow control The baud rate of the SIM918 cannot be changed Flo...

Page 25: ...hapter 2 1 About Transimpedance Amplifiers 2 2 2 1 1 Input capacitance and stability 2 2 2 1 2 Choosing the right gain 2 3 2 2 Bias and Ground 2 4 2 2 1 Grounds 2 4 2 2 2 Bias 2 4 2 3 Output 2 5 2 4 Autozero Trim 2 5 2 5 Phase Locked Loop 2 6 2 6 Autocalibration 2 6 2 7 Clock Stopping 2 7 2 8 Quiescent Operation 2 8 2 1 ...

Page 26: ...plifier of the SIM918 Precision Current Preamplifier is a transimpedance amplifier based on a composite JFET input design 2 1 1 Input capacitance and stability The input impedance of JFET devices is extremely large However the impedance experienced as a whole by a current input to the feedback amplifier i e the change in the input voltage1 divided by the input current has two other much more signi...

Page 27: ...ance in parallel with the effective inductance can form a resonant tank circuit if the capacitance is large enough that the resulting resonant frequency lies within the bandwidth of the transimpedance amplifier The SIM918 has adequate compensation feedback capacitance to prevent oscillation for up to 100 pF of ad ditional input capacitance 4 To avoid a feedback oscillation follow these steps 1 Pla...

Page 28: ...ar panel Shield Program Voltage and Ref Clock Sync BNCs are connected to chassis ground Pin 9 of the DB 15 SIM interface connector The separate power signal and chassis grounds are not directly connected within the preamplifier When operating in the SIM900 Mainframe the three grounds are tied together inside the mainframe and through the mainframe to the Earth The signal and power grounds are conn...

Page 29: ...nt panel The output signal is filtered by a passive LRC with f 3 dB 25 kHz The filter eliminates broad spectrum noise while adding a negligi ble amount of overshoot in the step response The R in the filter contributes to the output resistance The output difference amplifier when engaged Bias not at GND introduces an offset error that can be greater than the maximum input offset error of the preamp...

Page 30: ...e PLL oscillator runs freely generating a 1 0 Hz square wave with rising edges at the beginning of each autozero half cycle The voltage controlled oscillator in the loop operates at 240 Hz for 60 Hz power line frequency FPLC and at 200 Hz for FPLC 50 Hz The PLL can be automatically inhibited and the voltage controlled oscillator turned off when the reference clock is External and au tozero is off ...

Page 31: ... 2 If an external reference clock is detected the autocalibration terminates immediately with LDDE 2 Autocalibration does not affect gain accuracy 2 7 Clock Stopping The microprocessor clock of the SIM918 stops if the module is idle freezing the digital circuitry The following actions wake up the clock 1 A power on 2 A press of a front panel button 3 Activity send or receive at the remote interfac...

Page 32: ...clock transitions 1 Reset the preamplifier Section 1 5 2 Set Input to Open 3 Wait for at least 40 s 4 Turn autozero off 5 Select the desired gain 6 Close the input 7 Perform the measurement After this sequence is complete the control output of the autozero circuit holds at a value that initially drives the input offset within its specification Without active autozeroing the input offset may drift ...

Page 33: ... 5 Configuration commands 3 11 3 4 6 Calibration commands 3 14 3 4 7 Status commands 3 16 3 4 8 Interface commands 3 19 3 4 9 Serial communication commands 3 22 3 5 Status Model 3 24 3 5 1 Status Byte SB 3 25 3 5 2 Service Request Enable SRE 3 25 3 5 3 Standard Event Status ESR 3 26 3 5 4 Standard Event Status Enable ESE 3 26 3 5 5 Communication Error Status CESR 3 26 3 5 6 Communication Error Sta...

Page 34: ...m 3 12 Gain INPT z 3 12 Input BIAS z 3 12 Bias SHLD y z 3 13 Shield CHOP z 3 13 Autozero SYNC z 3 13 Reference Clock Direction FREQ 3 13 Reference Clock Frequency PHAS 3 14 Autozero Phase APLL z 3 14 Keep PLL Active Calibration ACAL 3 14 Autocalibration READ m 3 15 Read Microvoltmeter OFST m j 3 15 Offset Trim Status CLS 3 16 Clear Status STB i 3 16 Status Byte SRE i j 3 16 Service Request Enable ...

Page 35: ... 3 18 Overload RCLK 3 19 Reference Clock State Interface RST 3 19 Reset IDN 3 20 Identify TST 3 20 Self Test OPC 3 20 Operation Complete CONS z 3 20 Console Mode LEXE 3 21 Execution Error LCME 3 21 Command Error LDDE 3 22 Device Error TOKN z 3 22 Token Mode TERM z 3 22 Response Termination Serial Communications PARI z 3 23 Parity SIM918 Precision Current Preamplifier ...

Page 36: ... Self Test A ACAL 3 14 Autocalibration APLL z 3 14 Keep PLL Active AWAK z 3 11 Keep Clock Awake B BIAS z 3 12 Bias C CESE i j 3 17 Communication Error Status Enable CESR i 3 17 Communication Error Status CHOP z 3 13 Autozero CONS z 3 20 Console Mode F FPLC j 3 12 Power Line Cycle Frequency FREQ 3 13 Reference Clock Frequency G GAIN m 3 12 Gain H HELP 3 10 Instrument Help I INPT z 3 12 Input L LBTN...

Page 37: ...8 Overload P PARI z 3 23 Parity PHAS 3 14 Autozero Phase PSTA z 3 18 Pulse STATUS Mode R RCLK 3 19 Reference Clock State RCSE i j 3 17 Reference Clock Status Enable RCSR i 3 17 Reference Clock Status READ m 3 15 Read Microvoltmeter S SHLD y z 3 13 Shield SYNC z 3 13 Reference Clock Direction T TERM z 3 22 Response Termination TOKN z 3 22 Token Mode SIM918 Precision Current Preamplifier ...

Page 38: ... power line frequency FPLC 2 The gain 3 Autozero on off 4 Input selection on open 5 Input shield selection program bias ground 6 Bias selection on ground 7 Bias shield selection float ground 8 Whether or not the phase locked loop stays active when au tozero is off 9 Calibration values Upon power on those settings are restored to their values before the power was turned off Where appropriate the de...

Page 39: ...ce specifies the command The rest of the sequence consists of parameters Commands may take either set or query form depending on whether the character follows the mnemonic Set only commands are listed without the query only commands show the after the mnemonic and optionally query commands are marked with a Parameters shown in and are not always required Parameters in are required to set a value a...

Page 40: ...y its corresponding integer value For ex ample to set the response termination sequence to hCRi hLFi the following two commands are equivalent TERM CRLF or TERM 3 For queries that return token values the return format keyword or integer is specified with the TOKN command SIM918 Precision Current Preamplifier ...

Page 41: ...l 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 the SIM918 are set as straight teletype font while responses received by the host computer from the SIM918 are set as slanted teletype font The usage examples vary with respect to set query optional parame ters and tok...

Page 42: ...equired the brackets themselves should not be sent General commands HELP Send this text AWAK z Keep the module clock awake Configuration commands FPLC j Power line rejection frequency 50 60 GAIN m Set query gain INPT z Input OPEN CLOSE BIAS z Bias GND ON SHLD y z Shield INPUT BIAS GND BIAS FLOAT PROG CHOP z Autozero OFF ON SYNC z Reference clock IN OUT FREQ Reference clock frequency Hz PHAS Switch...

Page 43: ...known state IDN Identify TST Does nothing OPC Operation complete CONS z Console OFF ON LEXE Last Execution Error LCME Last Communications Error LDDE Last Device Error TOKN z Turn token mode OFF ON TERM z Cmd line end NONE CR LF CRLF LFCR Serial interface command baud rate is always 9600 PARI z Parity NONE EVEN ODD MARK SPACE Keep Clock Awake AWAK z Set query the SIM918 keep awake mode to z OFF 0 O...

Page 44: ...put terminal to the output of the transimpedance stage through RF 20 kΩ This state is indicated by all GAIN LEDs switched off With BIAS GND the configuration reproduces the input offset voltage at the output of the instrument This voltage may be measured with READ 3 The configuration m 0 is volatile and is reset to m 1 upon power on GAIN Example 2 Input INPT z Set query the preamplifier input conn...

Page 45: ...rection of the signal at the SIM918 rear panel Ref Clock Sync connector to z IN 0 OUT 1 The direction is reset to IN upon power on SYNC 1 Example Reference Clock Frequency FREQ Query the reference clock frequency of the preamplifier in hertz The nominal frequency of the internal reference clock is 1 0 Hz The command can also be used to measure the frequency of an external reference clock If autoze...

Page 46: ...uring that no digital clock transitions occur One consequence of APLL OFF is that the oscillator will require up to 250 s to reestablish the lock to an external reference when returning to CHOP ON Conversely with APLL ON the internal oscillator will continue to track an external 1 pps reference clock during CHOP OFF periods In this case there is no re lock time needed when returning to CHOP ON The...

Page 47: ...s for the command to execute while internal switches are configured and the voltages are sampled and averaged Autozero is ON while READ executes and the reference clock is used during the measurement The results of READ will be unpredictable if the reference clock is external and Unlocked Remote commands are not processed until READ is complete READ 1 Example 12 Offset Trim OFST m j Set query offs...

Page 48: ...s causes the STATUS signal to be deasserted Note that STB i will not clear STATUS even if Bit i is the only bit presently causing the STATUS signal STB Example 16 Service Request Enable SRE i j Set query the Service 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 regist...

Page 49: ...erload Status Register Bit i Upon executing an OLSR query the returned bit s of the OLSR reg ister are cleared OLSR Example 3 Overload Status Enable OLSE i j Set query the Overload Status Enable register Bit i to j OLSE 4 Example Reference Clock Status RCSR i Query the Reference Clock Status Register Bit i Upon executing an RCSR query the returned bit s of the RCSR reg ister are cleared RCSR Examp...

Page 50: ...sync 5 INPUT Open 6 INPUT Shield 7 BIAS GND 8 BIAS Shield 9 Both GAIN and GAIN autocalibrate 10 A button held upon power on reset The value 0 is returned if no button was pressed since the last LBTN A query of LBTN always clears the button code so a subse quent LBTN will return 0 LBTN Example 5 Overload OVLD Query the current overload condition The response is OVLD Overloaded 1 Bias 2 Output 4 Bia...

Page 51: ...ne correspondence between the response of RCLK and bits in RCSR Once cleared by RCSR or CLS the reference clock status bits will stay cleared even though the reference clock state may persist and remain reported by RCLK RCLK Example UNLOCKED 3 4 8 Interface commands The Interface commands provide control over the interface between the SIM918 and the host computer Reset RST Reset the SIM918 to its ...

Page 52: ... n005432 ver2 1 Self Test TST There is no internal self test in the SIM918 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 com plete but does not affect the ESR register OPC Example 1 Console Mode CONS z Set query the console mode to z OFF 0 ON 1 CONS causes each ch...

Page 53: ...ific queries of 0 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 Definition 0 No command error since last LCME 1 Illegal command 2 Undefined command 3 Illegal query 4 Illegal set 5 Missing parameter s 6 Extra parameter s 7 Null parameter s 8 Parameter buff...

Page 54: ...eger value 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 is appended to all query responses sent by the module and is constructed of ASCII character s 13 carriage return and 10 line feed The token mnemonic gives the sequence of characters A reset d...

Page 55: ...3 4 Commands 3 23 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 SIM918 Precision Current Preamplifier ...

Page 56: ...ndef undef Bias Output OLSR OLSE Overload Status STATUS X X X X 3 2 1 0 X X X X 3 2 1 0 Leave Arrive Lock undef undef undef undef Unlock RCSR RCSE Reference Clock Status Figure 3 1 Status register model for the SIM918 Precision Cur rent Preamplifier There are two categories of registers in the SIM918 status model Event Registers These read only registers record the occurrence of defined events If ...

Page 57: ...ates that the input buffer is empty and the command parser is idle Can be used to help synchronize SIM918 query responses ESB Event Status Bit Indicates whether one or more of the enabled events in the Standard 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...

Page 58: ...xecution Error Indicates the error in a command that was successfully parsed Out of range parameters are an example CME Command Error Indicates a command parser detected error URQ User Request Indicates 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 59: ... input buffer to be flushed and resets the command parser RTSH RTS Holdoff Event Unused in the SIM918 CTSH CTS Holdoff Event Unused in the SIM918 DCAS Device Clear Indicates that the SIM918 received the Device Clear signal an RS 232 hbreaki Clears the input buffer and the output queue and resets the command parser 3 5 6 Communication Error Status Enable CESE The CESE acts as a bitwise AND with the...

Page 60: ...of the overload 3 5 8 Overload Status Enable OLSE The OLSE acts as a bitwise AND with the OLSR register to produce the single bit OLSB message in the Status Byte Register SB The register can be set and queried with the OLSE command At power on this register is cleared 3 5 9 Reference Clock Status RCSR The Reference Clock Status Register consists of 4 event flags each of the flags is set by the cor...

Page 61: ...ocked to locked Reading this register with the RCSR query clears all event bits that are set If the clock state persists e g the clock remains un locked the bits will remain cleared until the state ceases and reoc curs Use RCLK to query the current state of the reference clock 3 5 10 Reference Clock Status Enable RCSE The RCSE acts as a bitwise AND with the RCSR register to produce the single bit ...

Page 62: ...3 30 Remote Operation SIM918 Precision Current Preamplifier ...

Page 63: ...4 Circuit Description In This Chapter 4 1 Schematic Diagrams 4 2 4 1 ...

Page 64: ...4 2 Circuit Description 4 1 Schematic Diagrams Circuit schematic diagrams follow this page SIM918 Precision Current Preamplifier ...

Page 65: ... 3 6 3 12 3 19 shield button see Button BIAS Shield LED see LED BIAS Shield voltage iii 1 2 4 1 7 8 2 4 5 3 15 limits viii ix 1 7 2 4 5 voltage buffer 1 7 2 4 offset voltage 1 7 2 4 Block diagram 1 4 BNC iii viii ix 1 3 1 7 8 2 3 4 2 7 3 12 3 15 Buffer bias see Bias voltage buffer input 3 6 3 25 27 overflow 3 6 7 3 27 output see Output queue voltage see Output voltage buffer Button 1 9 3 18 3 26 A...

Page 66: ...also Shield pro gram voltage current iii 1 2 1 4 6 1 8 2 2 impedance viii 1 2 2 2 LED see LED INPUT Open maximum cable length 2 3 offset voltage iii viii 1 2 1 6 7 2 5 2 8 3 12 3 15 adjusting see Trim input offset drift 2 8 measuring 3 12 3 15 zeroing 3 14 program see Shield program voltage resistance see Input impedance selecting viii 1 3 1 6 1 9 3 6 3 12 3 19 shield button see Button INPUT Shiel...

Page 67: ... 6 7 3 6 7 3 11 14 3 18 3 20 3 22 3 25 29 Power line frequency see FPLC Preparation for use iv Program see Shield program voltage Query command 3 7 3 21 3 25 Quiescent operation 1 3 2 6 2 8 3 14 Rear panel 1 5 1 8 Reference clock viii 1 2 3 1 5 1 8 3 14 15 3 19 3 21 capture time 1 6 2 6 3 14 capture range see input frequency limits connector iii viii 1 2 1 6 1 8 2 4 2 6 7 3 13 3 28 direction 1 8 2...

Page 68: ...y Status 3 15 3 24 registers 3 16 3 24 CESE 3 17 3 27 CESR 3 6 3 16 3 25 27 ESE 3 16 3 20 3 26 ESR 3 6 3 16 3 20 3 25 OLSE 3 17 3 20 3 28 OLSR 3 17 18 3 25 3 27 28 RCSE 3 17 3 29 RCSR 3 17 3 19 3 25 3 28 29 SB 3 16 3 25 29 SRE 3 16 3 20 3 25 Sticky bits 3 24 25 Temperature ix 2 6 Token 3 7 8 3 21 mode 3 19 3 22 Transimpedance iii 1 2 2 2 amplifier 1 2 2 2 3 Transimpedance stage iii 1 4 1 7 2 2 5 3...

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