EXCELLENCE IN MAGNETICS AND CRYOGENICS AMI MODEL 187 LIQUID LEVEL CONTROLLER INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS American Magnetics, Inc.
Model 187 Liquid Level Controller Model 187 Configuration AMI Order Number:_____________________ Shipping Date:_________________________ Model 187 Serial #:______________________ Firmware Revision:_____________________ Input Power Requirements:___________________________________________________________ Sensor Length (mm):_____________________________________________________________ Calibration Passcode:____________________ Maximum Dielectric: _________________ Configuration Notes: ___________________
Table of Contents Foreword................................................................................... v Purpose and Scope..................................................................... v Contents of This Manual .......................................................... v Applicable Hardware ............................................................... vi General Precautions................................................................. vi Cryogen Safety.....................................
Table of Contents 4 ii 3.2 Sensor contamination ..............................................................17 3.3 Menu Reference........................................................................18 3.3.1 Accessing Menus ..........................................................18 3.3.1.1 Entering Numerical Values .............................18 3.3.1.2 Menu Option Selection .....................................19 3.3.1.3 Exiting Menus ..................................................19 3.3.
Table of Contents 4.3.3 5 Flow Control Modes..................................................... 39 4.4 IEEE-488 Configuration ......................................................... 39 4.4.1 Termination Characters.............................................. 39 4.4.2 Device Clear ................................................................. 40 4.5 Command Reference ............................................................... 40 4.5.1 System-Related Commands ................................
Table of Contents Appendix..................................................................................57 A.1 4-20 mA Current Loop Option.................................................57 A.2 Auxiliary Connector J8 Pinout ................................................58 A.3 IEEE-488 Connector ................................................................59 A.4 RS-232/422 Connector..............................................................60 Index................................................
Foreword Purpose and Scope This manual contains the operation and maintenance instructions for the American Magnetics, Inc. Model 187 Liquid Level Controller. The manual outlines the instructions for instrument use in various system designs.
Foreword Applicable Hardware Applicable Hardware The Model 187 has been designed to operate with an AMI Liquid Level Sensor. Operation with other equipment is not recommended and may void the warranty. General Precautions Cryogen Safety Personnel handling cryogenic liquids should be thoroughly instructed and trained as to the nature of the liquids. Training is essential to minimize accidental spilling.
Foreword Safety Summary 2. Do not apply heat. Loosen any clothing that may restrict circulation. Apply a sterile protective dressing to the affected area. 3. If the skin is blistered or there is any chance that the eyes have been affected, get the patient immediately to a physician for treatment. Containers of cryogenic liquids are self pressurizing (as the liquid boils off, vapor pressure increases). Hoses or lines used to transfer these liquids should never be sealed at both ends (i.e.
Foreword Safety Summary rupture disks, etc.) included in the cryostat and top plate assembly are necessary. Recommended Safety Equipment First Aid kit Fire extinguisher rated for class C fires Leather gloves Face shield Signs to indicate that there are potentially dangerous cryogens in use in the area.
1 Introduction 1.1 Model 187 Features The American Magnetics, Inc. (AMI) Model 187 Liquid Level Controller system (patent-pending) is an advanced, microprocessor-based solution designed to provide compensated, capacitance-based level monitoring and control of virtually any cryogenic liquid over a wide range of operating pressures and temperatures. 1.1.
Introduction Model 187 Features 1.1.3 Convenient display and direct keypad entry The instrument is equipped with a 16 x 2 backlit character-mode LCD display which provides liquid level and setpoint indication in inches, centimeters, or percent as selected by the user. A front panel keypad interface allows the user to easily view and modify the instrument settings. The default display indicates liquid level and fill/loss rate.
Introduction Front Panel Layout 1.
Introduction Rear Panel Layout 1.3 Rear Panel Layout 1 2 2873876 *$6 5() /,4 5() - 3 ,13876 352%( - *$6 5() - /,4 5() - 352%( - ,((( - &21752//(5 287387 $0(5,&$1 0$*1(7,&6 ,1& 2$.
Introduction Instrument/Sensor System Diagram 1.4 System Diagram SENSOR CABLES RG-59/U COAXIAL 150 FEET MAXIMUM LENGTH 2873876 *$6 5() /,4 5() - ,13876 352%( - *$6 5() - /,4 5() - - 352%( - ,((( - &21752//(5 287387 /,1( +] $ 0$; $0(5,&$1 0$*1(7,&6 ,1& 2$.
Introduction Specifications 1.5 Model 187 Specifications @ 25 °C Level Measurements Resolution: 0.1 %, 0.1 cm, or 0.1 in Accuracy: ± 0.5% Linearity: ± 0.2% Temperature Coefficient: 0.1% / °C Operating Parameters HI, A, B, and LO Alarms: HI/LO Alarm Relay Contact Ratings: Controller Output: Fill Timer: 0% to 100% adjustable 10 V at 0.5 A (normally open, closed on alarm) AC line voltage @ 2A max current 0.1 to 9,999.9 minutes Analog Output Integral Non-linearity: ± 0.
2 Installation Warning Before energizing the instrument, the earth ground of the power receptacle must be verified to be at earth potential and able to carry the rated current of the power circuit. Using extension cords should be avoided; however, if one must be used, ensure the ground conductor is intact and capable of carrying the rated current.
Installation Installing the sensor 2.2 Rack Mounting the Instrument If the instrument has a rack mount chassis, follow the following procedure: a. Attach the rack mount adapter pieces to the instrument by first removing the four screws on the side of the instrument that attach the cover to the chassis. Attach the rack mount adapter pieces to the sides of the instrument by reinstalling the screws. b.
Installation Connecting the sensor cables 2.4 Connecting the Model 187 to the Sensor Note The electrical characteristics of the interconnecting coaxial cables are temperature dependent over extreme ranges and the cables may become brittle at cryogenic temperatures. The cables should be mounted in such a manner as to avoid large temperature gradients such as those encountered in the path of dewar vents.
Installation Connecting the sensor cables included with the liquid level sensor packaging to reduce the possibility of this occurring. If the sensor is operated in an environment where it will be exposed to moisture or other contaminants, AMI recommends applying a small amount of ECL to any of the BNC connectors that may be exposed. Mate the doped connectors and then remove any excess ECL from the outside of the connector.
Installation Verifying power requirements 2.6 Connecting the Instrument to Power Warning The Model 187 operates on 50-60 Hz power and may be configured for 100-120 or 200-240 VAC ±10%. The power requirements for each instrument is marked on the calibration sticker on the bottom of the instrument. Verify that your instrument is configured for your power source prior to plugging in the line cord. Do not fail to connect the input ground terminal securely to an external earth ground.
Installation Verifying power requirements 12
3 Operation 3.1 Operational Guidelines This section describes the front panel display and kepad functions for the Model 187. In addition to the front panel operation described, the remote communication ports provide methods for performing the identical operations and acquiring the current state of the instrument. Refer to the Remote Interface section beginning on page 27 for more details regarding the communication functions. 3.1.
Operation Operational Guidelines 3.1.2 Selecting the Appropriate Units Repeatedly press the 81,76 key to cycle between display units of percent, inches, or centimeters. The level reading displays the sensor length, or percentage of the measured span, above the zero offset that is immersed in liquid (see diagram below). The selected units may be changed at any time except during the process of entering a numerical value. 3.1.
Operation Operational Guidelines 3.1.4 Configuring the HI and LO Alarms To adjust the HI and LO alarm levels, use the HI and LO menus accessible by using the +, and /2 keys, respectively. The setpoints may be located anywhere between 0% to 100% of the measured span. The HI and LO alarm adjustments are compatible with all three units modes. a.
Operation Operational Guidelines c. In addition to the LED functions, the controller output receptacle may be energized and de-energized as discussed in paragraph 3.1.6 below. Note The A setpoint must always be above the B setpoint. The firmware does not allow these setpoints to be reversed. Both may be set from 0% to 100% as long as A > B. 3.1.
Operation Sensor contamination The fill timeout feature is enabled when the instrument is operated in the AUTO mode with a fill timeout setting greater than zero. Once the liquid level falls below the B setpoint, an internal fill timer (whose period is the timeout setting) begins to increment. If the liquid level does not reach the A setpoint before the timeout period expires, the FILL LED will begin blinking and power to the rear panel controller output receptacle will be interrupted.
Operation Menu Reference 3.3 Menu Reference The default display is illustrated in Figure 3-2 below. The default display provides the level measurement in the selected units, and a usage estimate in the selected units per minute. An arrow displayed to the right of the usage estimate indicates the usage trend. The operating values on the left side of the display are always visible during any mode of operation or menu selections. /HYHO ∆ PLQ ↑ Figure 3-2.
Operation Menu Reference If the (6& key is pressed once while entry is initiated, the entered digits will be cleared and the cursor will remain for reentry of a new desired value. If the (6& key is depressed twice, the setting will revert to the previous value and the entry is cancelled. 3.3.1.2 Menu Option Selection Some menus may require the user to cycle through and select from a list of predefined options.
Operation Menu Reference The LO alarm may be set between 0.0% to 100.0%. The default setting is 20.0%. 3.3.4 A Menu /HYHO $ Accessible by pressing the $ key. The “A” menu adjusts the A setpoint level in the selected units, which defines the upper limit of the automatic fill function control band. When the measured liquid level reaches or exceeds the A setpoint, the A LED on the front panel is energized. When the level falls below the A setpoint, the LED is extinguished.
Operation Menu Reference The RATE alarm may be set up to 9,999.9% per minute. The default value is 10.0% per minute. 3.3.7 LEN (Length) Menu The LEN menu is accessible by pressing the /(1 key while in selected units of inches or centimeters. The LEN menu provides access to two menu screens, accessible by pressing the 0(18 key, for the zero offset and measured span settings. For a complete discussion of the zero offset and measured span settings, refer to paragraph 3.1.3 on page 14. 3.3.7.
Operation Menu Reference 3.3.8.1 Fill Mode )LOO 0RGH 2Q 2II $XWR The fill mode menu provides three options for the fill mode of the Model 187. Press the 237,21 key to cycle between the three selections The FILL LED indicates the energized or de-energized state of the controller output receptacle. On: Energizes the controller output receptacle. Off: De-energizes the controller output receptacle.
Operation Menu Reference remote interface, and the serial remote interface. Consult Section 4 for more information regarding the communication interfaces. 3.3.10.1 Display Contrast 'LVSOD\ &RQWUDVW Adjusts the contrast of the liquid crystal display from 0 to 100%. The default setting is 80%. 3.3.10.2 IEEE-488 Address ,((( $GGUHVV Specifies the IEEE-488 primary address of the Model 187. The valid range is from 0 to 30.
Operation Menu Reference 3.3.10.5 Serial Stop Bits 6HULDO 6WRS %LWV Specifies the number of stop bits for the serial interface. Use the 237,21 key to cycle between values. The default value is 1 stop bit. 3.3.10.6 Serial Handshaking 6HULDO +DQGVKDNH 6: 1RQH Specifies whether the serial interface uses no handshaking or software flow control (commonly referred to as XON/XOFF). Hardware flow control (i.e. using RTS/CTS) is not supported. Use the 237,21 key to cycle between values.
Operation Menu Reference After entry of the correct passcode and the (17(5 is pressed, the calibration selection menu will appear as shown below: &DOLEUDWLRQ 8VHU )DFWRU\ The 237,21 key can be used to select between the USER and FACTORY calibrations. The selected calibration is retained between power-ups of the instrument.
Operation Menu Reference 26
4 Remote Interface Reference The Model 187 provides the capability of supporting RS-232 and IEEE 488.2 compliant interfaces simultaneously. Upon request, the RS-232 port can be reconfigured for RS-422 operation. Separate output buffers are provided for the serial and IEEE-488 return data. However, for optimal performance and simplicity of programming, AMI normally recommends limiting operation to one interface.
Remote Interface Reference SCPI Command Summary Status System Commands (see page 41 for more information) *STB? *SRE *SRE? *CLS *ESR? *ESE *ESE? *PSC {0|1} *PSC? *OPC *OPC? STATus:ALARm:CONDition? STATus:ALARm:EVENt? STATus:ALARm:ENABle STATus:ALARm:ENABle? Alarm Configuration Commands and Queries (see page 43 for more information) CONFigure:ALARm:HI CONFigure:ALARm:A CONFigure:ALARm:B CONFigure:ALARm:LO CONFigure:ALARm:RATE
Remote Interface Reference SCPI Command Summary Level and Usage Queries (see page 44 for more information) LEVel? USAGe? Length Configuration Commands and Queries (see page 44 for more information) CONFigure:LENgth:ZERO CONFigure:LENgth:SPAN LENgth:ZERO? LENgth:SPAN? Fill Mode Control and Queries (see page 45 for more information) CONFigure:FILL:MODE {0|1|2} or {OFF|ON|AUTO} CONFigure:FILL:TIMEout FILL:MODE? FILL:TIMEout? FILL:TIME:ELAPsed? Calibration Commands a
Remote Interface Reference SCPI Introduction Units Commands and Queries (see page 46 for more information) UNITs {0|1|2} PERCent INches CM UNITs? 4.2 Programming Overview The Model 187 conforms to the SCPI (Standard Commands for Programmable Instruments) IEEE standard. The SCPI standard is an ASCII-based specification designed to provide a consistent command structure for instruments from various manufacturers.
Remote Interface Reference SCPI Status System Alarm Registers EV EN 0 HI Alarm 0 <1> 1 A Alarm 1 <2> 2 B Alarm 2 <4> 3 LO Alarm 3 <8> 4 RATE Alarm 4 <16> 5 Over/Under Flow Max Dielectric Exceeded 5 <32> C 6 7 STATus:ALARm:COND? 6 <64> 7 <128> "OR" NOTES: C = Condition Register EV = Event Register EN = Enable Register STATus:ALARm:EVENt? STATus:ALARm:ENABle < value> STATus:ALARm:ENABle? Serial Output Buffer Status Byte Registers IEEE-488 Output Buffer Standard Event Reg
Remote Interface Reference SCPI Status System enable register. To enable or disable bits in an enable register, write a decimal value which corresponds to the binary-weighted sum of the bits you wish reported to the Status Byte register. 4.2.2.1 Status Byte Registers The Status Byte register group reports conditions from the Standard Event register or output buffers.
Remote Interface Reference SCPI Status System Bit 1 of the Status Byte register, indicating that the controller output is energized, remains set until the controller output is de-energized via the front panel, a fill timeout, or by remote command. However, an SRQ is only asserted when the controller output transitions from de-energized to energized. Bits 3 and 4, indicating available data in an output buffer, are similar in that the SRQ is only asserted when data is first available in an output buffer.
Remote Interface Reference SCPI Status System 4.2.2.3 Reading the Status Byte using *STB? The *STB? returns the contents of the Status Byte register, but it is processed in the command queue like any other command. The *STB? command returns the same result as a Serial Poll, however bit 6 of the Status Byte register is not cleared. Issuing an *STB? query does not clear an SRQ condition. 4.2.2.
Remote Interface Reference SCPI Status System Table 4-2. Bit definitions for the Standard Event register. 4.2.4 Bit Number Decimal Value 0 Operation Complete 1 All commands prior to and including *OPC have been executed. 1 Not Used 2 Always “0”. 2 Query Error 4 A query error occurred. See the error messages in the -200 range. 3 Device Error 8 A device error occurred. See the error messages in the -400 range. 4 Execution Error 16 An execution error occurred.
Remote Interface Reference Command Handshaking The Alarm Event register is queried using the STATus:ALARm:EVENt? command. The Alarm Event enable register is cleared when: The STATus:ALARm:ENABle 0 command is executed. The power is turned off and then back on, and the instrument was configured for *PSC 1 (power-on status clear). The enable register settings are persistent if the Model 187 is configured for *PSC 0 (no status clear on power-on). Table 4-3.
Remote Interface Reference Command Handshaking 4.2.5.1 Using the *OPC Command The *OPC command is executed within the normal command queue. Upon completed execution of the *OPC command, the “Operation Complete” bit (bit 0) of the Standard Event register will be set. If the operator has so configured the Standard Event and Status Byte enable registers, the *OPC command can generate an IEEE-488 service request when execution completes (see Figure 4-1).
Remote Interface Reference RS-232/422 Configuration 4.3 RS-232/422 Configuration The Model 187 allows several parameters related to the RS-232/422 interface to be configured by the user. See the Comm Menu description in paragraph 3.3.10 on page 22 for illustrations of the menus provided for configuring the Model 187 serial interface.
Remote Interface Reference IEEE-488 Configuration transmission. The Model 187 can accept , , , or , or a semicolon ( ; ) as termination characters from an external computer. 4.3.3 Flow Control Modes The operator may select between two flow control modes for data transfers between the host device and the Model 187: None: Data is sent and received over the interface with no flow control.
Remote Interface Reference System-Related Commands 4.4.2 Device Clear The Device Clear is a low-level IEEE-488 bus message which you can use to return the instrument to a responsive state if communication appears to stall. The status registers and the error queue are left unchanged when a Device Clear message is received. Device Clear performs the following actions: The Model 187’s serial and IEEE-488 output buffers are cleared. The Model 187 is prepared to accept a new command.
Remote Interface Reference Status System Commands SYSTem:LOCal Enables all front panel controls. All front panels controls are enabled by default after a power-up or *RST command. SYSTem:REMote Disables all front panel controls. SYSTem:ERRor? Queries the instrument’s error buffer. Up to 10 errors are stored in the instrument’s error buffer. Errors are retrieved in first-in-first-out (FIFO) order. The error buffer is cleared by the *CLS (clear status) command or when the power is cycled.
Remote Interface Reference Status System Commands *ESE Enables bits in the Standard Event register to be reported in the “Standard Event” bit (bit 5) of the Status Byte register. To enable bits, you must write a decimal which corresponds to the binaryweighted sum of the bits you wish to enable. Refer to Table 4-2 on page 35 for more information.
Remote Interface Reference Alarm Configuration Commands and Queries sum of the bits you wish to enable. Refer to Table 4-3 on page 36 for more information. For example, to enable all alarms to be reported in bit 2 of the Status Byte register, send: STATus:ALARm:ENABle 127; STATus:ALARm:ENABle? Returns a decimal sum which corresponds to the binary-weighted sum of the bits enabled by the last STATus:ALARm:ENABle command. 4.5.
Remote Interface Reference Level and Usage Queries ALARm:RATE? Returns the RATE alarm value in the presently selected remote units per minute. CONFigure:ALARm:MUTE {0|1} or {NO|YES} Mutes the continuous audible alarm if a HI, LO, or Over/Under Flow alarm condition exists. Error conditions will still report as a short audible beep. “0” or “NO” enables the continuous audible alarm. “1” or “YES”disables (or mutes) the continuous audible alarm.
Remote Interface Reference Fill Mode Control and Queries CONFigure:LENgth:SPAN Configures the measured span above the “zero point” in the selected remote units. LENgth:SPAN? Returns the measured span in the selected remote units. 4.5.6 Fill Mode Control and Queries The mode of operation and the timeout of the fill function may be controlled through the remote interfaces.
Remote Interface Reference Remote Units Commands and Queries CALibration:SELect {0|1} or {USER|FACTORY}, Selects between the USER and FACTORY calibrations. For example, the command: CAL:SELECT USER, 1234; selects the USER calibration (if available) and requires that the calibration passcode (“1234” in this example) be provided as a parameter. If the calibration passcode is missing or incorrect, the Model 187 will beep indicating an error.
Remote Interface Reference Error Messages 1,”INCHES” is returned if the remote units are inches. 2,”CM” is returned if the remote units are centimeters. PERCent Sets the remote units to percent. INches Sets the remote units to inches. CM Sets the remote units to centimeters. 4.
Remote Interface Reference Error Messages 4.6.1 Command Errors -101,"Unrecognized command" The command string sent was not identified as valid. Check the command string for invalid characters or separators, syntax errors, or for errors in the mnemonics. Spaces are not allowed before or after colon separators, and at least one space must separate a command string from the parameter(s). -102,"Invalid argument" The argument provided as a parameter for the command was invalid.
Remote Interface Reference Error Messages 4.6.2 Query Errors -201,"Unrecognized query" The query string sent (identified as a query by a ?) was not identified as valid. Check the query string for invalid characters or separators, syntax errors, or for errors in the mnemonics. Spaces are not allowed before or after colon separators. -202,"Query interrupted" A new query was processed before the return string of a previous query had been completely transmitted to the host.
Remote Interface Reference Error Messages -404,"Serial data overrun" The received buffer of the Model 187 was overrun. Either switch to software handshaking (XON/XOFF), or decrease the baud rate.
5 Service 5.1 Model 187 Maintenance The Model 187 was designed and manufactured to give years of reliable service. The only routine maintenance required is to keep the exterior surfaces of the instrument clean by gently wiping with a damp cloth moistened with a mild detergent. 5.2 Model 187 Troubleshooting Hints The following paragraphs serve as an aid to assist the user in troubleshooting a potential problem with the Model 187 within a cryogenic level measurement system.
Service Troubleshooting Hints 5.2.1 The Model 187 does not appear to be energized with the power switch in the 32:(5 (,) position. 1. Ensure that the Model 187 is energized from a power source of proper voltage. Warning If the instrument has been found to have been connected to an incorrect power source, return the instrument to AMI for evaluation to determine the extent of the damage. Frequently, damage of this kind is not visible and must be determined using test equipment.
Service Troubleshooting Hints d. Replace the fuse and securely fasten the instrument top cover. Reconnect the power-cord. 3. Verify the input voltage selector switch on the instrument’s printed circuit board is in the proper position for the available input power. Checking the input voltage selector requires removal of the top cover of the instrument. Observe the same safety procedures as presented in step 2, above. 4.
Service Troubleshooting Hints 5.2.3 The Model 187 displays “Over/Under Flow”. 1. The vapor and liquid reference plate sensors are either both submerged or exposed. The vapor reference plates should be exposed at all times. The liquid reference plates should be submerged at all times. 2. The dielectric between the vapor and liquid is not sufficiently different to allow for operation of the Model 187. The dielectric difference between the vapor and liquid must be greater than 1.0%.
Service Troubleshooting Hints 5.2.6 The liquid level unexpectedly rises rapidly as the tank level approaches 0%. 1. The liquid reference plate sensor is most likely becoming exposed to vapor. Verify that the zero offset does not fall below the highest point of the liquid reference plate sensor (see “Configuring the Length Settings” on page 14.). 5.2.7 The USER and FACTORY calibrations do not yield the same liquid level. 1. It is possible that the USER calibration was not performed properly.
Service Return Authorization cards that have introduced communication errors. AMI attempts to establish compatibility with as many products as possible, however it is difficult to test every card available. Contact AMI directly if you have thoroughly checked your setup and continue to experience problems with the IEEE-488 interface. 5.3 Additional Technical Support If the cause of the problem cannot be located, contact an AMI Technical Support Representative at (865) 482-1056 for assistance.
Appendix A.1 4-20 mA Current Loop Option The 4-20 mA output utilizes pins 2 and 4 of connector J8. When the Model 187 is configured for the 4-20 mA current loop option, the 0-10 VDC analog output from connector J8 is not available. The figure below shows the wiring diagram for the receiver. The 4-20 mA output has a maximum compliance of 11.5 VDC.
Appendix Auxiliary connector J8 pinout A.2 Auxiliary Connector J8 Pinout Pin Function 1 Not used 2 4-20 mA current loop output (optional feature) 3 0-10 VDC output (optional feature) 4 Analog output common 5&6 Lo level relay contacts (dry) 7&8 Hi level relay contacts (dry) 9 Not used Pin 1 J8 The HI level and LO level contacts are provided for external use by the customer. When a HI or LO level condition exists, the respective contact pairs are closed. The HI and LO setpoints provide 0.
Appendix IEEE-488 Connector A.3 IEEE-488 Connector - ,((( Table A-1. IEEE-488 female connector J7 description.
Appendix RS-232/422 Connector A.4 RS-232/422 Connector 56 - Table A-2. PC (DB-25)-to-Model 187 connections for RS-232 operation. PC (DTE) DB-25 Pin Model 420 (DCE) DB-9 Pin DTE Function 2 3 TD 3 2 RD 4 7 RTS 5 8 CTS 6 6 DSR 7 5 GND 8 1 DCD 20 4 DTR 22 9 RI Table A-3. PC (DB-9)-to-Model 187 connections for RS-232 operation.
Appendix RS-232/422 Connector Table A-4. EIA-530 Device-to-Model 187 connections for RS-422 operation.
Appendix RS-232/422 Connector 62
Index A H AMI Internet e-mail address AMI WWW address 56 applicable hardware vi audible alarm 13, 22 56 HI/LO contacts specs I IEEE-488 configuration 39 device clear 40 primary address 23 SRQ 33 termination characters 39 input voltage configuration 11 installation controller valve 10 instrument-to-sensor 9 rack mounting 8 sensor 8 verifying power requirements C calibration 24 medium 25 passcode entry 24 performing a USER cal 25 selection 25 cleaning a sensor 17 cleaning the instrument 51 configuration
Index R T rack mounting 8 rear panel layout 4 remote interface reference 27 alarm registers 35 command conventions 27 command handshaking 36 command reference 40 alarm commands 43 calibration 45 fill mode 45 lengths 44 level and usage rate 44 remote units 46 status commands 41 system commands 40 command summary 27, 28, error messages 47 message available bit(s) 34 overview 30 SCPI intro 30 serial polling 33 standard event register 34 status byte 32 status system 30 status system diagram 31 return authoriz
