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Lake Shore Model 340 Temperature Controller User’s Manual

Installation

3-3

3.1.5 Handling Liquid Helium and Liquid Nitrogen

Liquid Helium (LHe) and liquid nitrogen (LN

) may be used in conjunction with the Model 340. Although not

explosive, the following paragraphs provide safety considerations in the handling of LHe and LN

3.1.5.1 Properties

LHe and LN

are colorless, odorless, and tasteless gases. Gaseous nitrogen makes up about 78% of Earth’s

atmosphere, while helium comprises only about 5 ppm. Most helium is recovered from natural gas deposits.

Once collected and isolated, the gases liquefy when properly cooled. A quick comparison between LHe and

is provided in Table 3-1.

Table 3-1. Comparison of Liquid Helium to Liquid Nitrogen

PROPERTY LIQUID

HELIUM LIQUID

NITROGEN

Boiling Point @1 atm, in K
Thermal Conductivity (Gas), w/cm–K
Latent Heat of Vaporization, Btu/liter
Liquid Density, pounds/liter

4.2
0.083
2.4
0.275

77.35

0.013

152

0.78

3.1.5.2

Handling Cryogenic Storage Dewars

All cryogenic containers (dewars) must be operated in accordance with

instructions from the manufacturer. Safety instructions are normally posted on

the side of each dewar. Cryogenic dewars must be kept in a well-ventilated

place where they are protected from the weather and away from any sources

of heat. A typical cryogenic dewar is shown in Figure 3-1.

3.1.5.3

Liquid Helium and Nitrogen Safety Precautions

Transferring LHe and LN

and operation of the storage dewar controls should

be in accordance with instructions from the manufacturer/supplier. During this

transfer, it is important that all safety precautions written on the storage dewar

and recommended by the manufacturer be followed.

WARNING

Liquid helium and liquid nitrogen are potential asphyxiants and can

cause rapid suffocation without warning. Store and use in area with

adequate ventilation. DO NOT vent container in confined spaces. DO

NOT enter confined spaces where gas may be present unless area

has been well ventilated. If inhaled, remove to fresh air. If not

breathing, give artificial respiration. If breathing is difficult, give

oxygen. Get medical help.

Liquid helium and liquid nitrogen can cause severe frostbite to the

eyes or skin. DO NOT touch frosted pipes or valves. In case of

frostbite, consult a physician at once. If a physician is not readily

available, warm the affected areas with water that is near body

temperature.

The two most important safety aspects to consider when handling LHe and LN

are adequate ventilation and

eye and skin protection. Although helium and nitrogen gases are non-toxic, they are dangerous in that they

replace the air in a normal breathing atmosphere. Liquid products are of an even greater threat since a small

amount of liquid evaporates to create a large amount of gas. Therefore, it is imperative that cryogenic dewars

be stored, transfers accomplished, and systems operated in open and well ventilated areas.

Persons transferring LHe and LN

should make every effort to protect eyes and skin from accidental contact

with liquid or the cold gas issuing from it. Protect your eyes with full face shield or chemical splash goggles.

Safety glasses (even with side shields) are not adequate. Always wear special cryogenic gloves (Tempshield

Cryo-Gloves

or equivalent) when handling anything that is, or may have been, in contact with the liquid or

cold gas, or with cold pipes or equipment. Long sleeve shirts and cuffless trousers that are of sufficient length

to prevent liquid from entering the shoes are recommended.

NON-

MAGNETIC

KEEP

UPRIGHT

LIQUID

HELIUM

NON-

FLAMMABLE

Figure 3-1. Typical

Cryogenic Storage Dewar

Содержание 340

Страница 1: ...m Fax 614 891 1392 Telephone 614 891 2243 Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics Inc No government or other contract...

Страница 2: ...Continued 9 EXCEPT TO THE EXTENT ALLOWED BY APPLICABLE LAW THE TERMS OF THIS LIMITED WARRANTY STATEMENT DO NOT EXCLUDE RESTRICT OR MODIFY AND ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS APPLICA...

Страница 3: ...conforms to the following Directives and Standards Application of Council directives 73 23 EEC 89 336 EEC Standard to which Conformity is declared EN 61010 1 2001 Overvoltage II Pollution Degree 2 EN...

Страница 4: ...Lake Shore Model 340 Temperature Controller User s Manual C This Page Intentionally Left Blank...

Страница 5: ...mputer Interface 1 6 2 COOLING SYSTEM DESIGN 2 1 2 0 General 2 1 2 1 Temperature Sensor Selection 2 1 2 1 1 Temperature Range 2 1 2 1 2 Sensor Sensitivity 2 1 2 1 3 Environmental Conditions 2 2 2 1 4...

Страница 6: ...NSOR INPUTS 3 6 3 4 1 Sensor Input Connector and Pinout 3 6 3 4 2 Sensor Lead Cable 3 7 3 4 3 Grounding and Shielding Sensor Leads 3 7 3 4 4 Sensor Polarity 3 7 3 4 5 Four Lead Sensor Measurement 3 7...

Страница 7: ...put Off 5 3 5 2 SELECTING A TEMPERATURE RESPONSE CURVE 5 3 5 3 FILTER AND MATH 5 4 5 3 1 Filter 5 4 5 3 2 Max Min 5 5 5 3 3 Linear Equation 5 6 5 4 SCANNER SUPPORT 5 6 5 4 1 Scan Modes 5 6 5 4 2 Input...

Страница 8: ...e Beeper 7 6 7 4 HIGH AND LOW RELAYS 7 6 7 4 1 Selecting a Relay Mode 7 6 7 4 2 Manually Setting a Relay 7 6 8 INSTRUMENT PROGRAMMING 8 1 8 0 GENERAL 8 1 8 1 CURVE ENTRY FROM THE FRONT PANEL 8 1 8 1 1...

Страница 9: ...9 9 2 7 3 Program Operation 9 20 9 2 8 Troubleshooting 9 20 9 3 IEEE 488 SERIAL INTERFACE COMMANDS 9 21 10 OPTIONS AND ACCESSORIES 10 1 10 0 GENERAL 10 1 10 1 OPTIONS 10 1 10 2 ACCESSORIES 10 1 10 3 M...

Страница 10: ...Cabling 10 14 10 6 3 3 Reading Rate 10 14 10 6 4 Operation 10 15 10 6 4 1 General Operation 10 15 10 6 4 2 Input Setup 10 15 10 6 4 3 Temperature Control 10 15 10 6 5 Computer Interface Commands 10 16...

Страница 11: ...emplate Configuration 9 5 9 3 Typical National Instruments GPIB Configuration from IBCONF EXE 9 10 9 4 Serial Interface Connections 9 13 10 1 Model 2001 RJ 11 Cable Assembly 10 3 10 2 Model 2003 RJ 11...

Страница 12: ...Data Card 8 13 9 1 IEEE 488 Interface Program Control Properties 9 7 9 2 Visual Basic IEEE 488 Interface Program 9 8 9 3 Quick Basic IEEE 488 Interface Program 9 11 9 4 Serial Interface Specification...

Страница 13: ...ed in Chapter 5 Temperature control operation is described in Chapter 6 Analog and digital I O operation is described in Chapter 7 Instrument programming is provided in Chapter 8 Remote interface oper...

Страница 14: ...cle of cause and effect From the control equation to the actuator to the load to the sensor to the control loop and so on The loop operation allows the heat source to turn on and off repeatedly keepin...

Страница 15: ...rature below the setpoint 1 2 4 Heating Once the control equation computes the adjustment needed in heating the Model 340 implements it by changing the amount of current being sent to the resistive he...

Страница 16: ...s added to the Model 340 it may have its own isolated ground The heater output is also isolated from earth ground and from the sensor inputs to minimize interaction between the heater output and any o...

Страница 17: ...output has several current ranges These ranges allow different powers without the loss of control resolution The Model 340 allows for heaters of different resistance but at highest power the choice o...

Страница 18: ...scanning or be used to set and monitor system function 1 3 14 Memory Card A memory card slot conforming to PCMCIA pin out is included for special instrument applications The slot is not a general pur...

Страница 19: ...solution Rate Derivative 1 1000 seconds with 1 second resolution Manual Output 0 100 with 0 01 setting resolution Zone Control Mode 10 temperature zones with control parameters Setpoint Ramping 0 1 10...

Страница 20: ...300 K 3 0 mK at 675 K 1 m 5 3 mK at 30 K 2 4 mK at 77 K 2 6 mK at 300 K 3 0 mK at 800 K 10 m 5 3 mK at 30 K 2 4 mK at 77 K 2 6 mK at 300 K 3 0 mK at 675 K Electronic Accuracy Sensor Units Temperature...

Страница 21: ...ve 10 0 1 mK at 77 K 0 1 mK at 100 K 3 mK at 200 K 60 mK at 300 K 6 digits above 10 0 1 mK at 1 4 K 0 2 mK at 4 2 K 20 mK at 77 K 133 mK at 300 K 6 digits above 10 0 1 mK at 1 4 K 0 1 mK at 4 2 K 0 5...

Страница 22: ...0 2 V 12 mK at 4 2 K 10 mK at 300 K 0 4 V 24 mK at 4 2 K 20 mK at 300 K 0 2 pF 3 mK at 4 2 K 28 mK at 60 K 2 0 pF 65 mK at 4 2 K 34 mK at 77 K 10 mK at 200 K Electronic Accuracy Sensor Units Temperat...

Страница 23: ...s temperature range The experimental temperature range must be known when choosing a sensor Some sensors can be damaged by temperatures that are either too high or too low Manufacturer recommendations...

Страница 24: ...kage When different packages are available for a sensor consider the sensor mounting surface and how leads will be heat sinked 2 2 CALIBRATED SENSORS It can be difficult to choose the right sensor cal...

Страница 25: ...ve for either SoftCal or Precision Calibration CalCurve There are 3 ways to improve temperature sensor accuracy 8001 8000 3405 128F CALCRV Breakpoint pairs are factory loaded in non volatile memory Br...

Страница 26: ...d can be ordered with sensors or instruments Mounting materials is discussed in Paragraph 2 3 1 Sensor location is discussed in Paragraph 2 3 2 Thermal conductivity is discussed in Paragraph 2 3 3 Con...

Страница 27: ...ter wiring not shown for clarity 340 2 2 eps Figure 2 2 Typical Sensor Installation In A Mechanical Refrigerator 2 3 4 Contact Area Thermal contact area greatly affects thermal conduction because a la...

Страница 28: ...res to simplify heat sinking 2 3 9 Thermal Radiation Thermal black body radiation is one of the ways heat is transferred Warm surfaces radiate heat to cold surfaces even through a vacuum The differenc...

Страница 29: ...rtridge should be snugly held in a hole in the load or clamped to a flat surface Heat sinking for good thermal contact is again important Foil heaters are thin layers of resistive material adhered to...

Страница 30: ...s of the load as small as possible so the system can cool quickly and improve cycle time Small mass can also have the advantage of reduced thermal gradients Controlling a very small mass is difficult...

Страница 31: ...ange if either of these change 2 6 2 Integral I In the control loop the integral term also called reset looks at error over time to build the integral contribution to the output Output I PI e dt a f a...

Страница 32: ...ature Controller User s Manual 2 10 Cooling System Design P Only too high P Only P Only too low P I P I D temperature time change in setpoint actual temperature response a b c d e 340 2 3 bmp Figure 2...

Страница 33: ...e range is set too high the load may have very large temperature changes that take a long time to settle out Delicate loads can even be damaged by too much power Often there is little information on t...

Страница 34: ...to reach the setpoint An integral setting that is too high creates instability and cause the load temperature to oscillate Begin this part of the tuning process with the system controlling in proporti...

Страница 35: ...the load is disguised by the ramp rate The user can tell when data is being logged because the Tune annunciator changes to Tuning When the annunciator returns to Tune the process is complete and will...

Страница 36: ...rest These parameters are then entered into the Model 340 where up to ten zones can be defined with different P I D heater range and manual output A setpoint setting is assigned as the maximum tempera...

Страница 37: ...please notify the shipping agent immediately Open the shipping containers A packing list is included with the system to simplify checking that the instrument sensor accessories and manual were receiv...

Страница 38: ...equipped with a three conductor AC power cable The power cable must either be plugged into an approved three contact electrical outlet or used with a three contact adapter with the grounding wire gre...

Страница 39: ...and liquid nitrogen are potential asphyxiants and can cause rapid suffocation without warning Store and use in area with adequate ventilation DO NOT vent container in confined spaces DO NOT enter con...

Страница 40: ...hysician immediately 3 2 REAR PANEL DEFINITION This paragraph provides a summary of Model 340 rear panel connections See Figure 3 2 CAUTION l Verify that the AC Line Voltage shown in the window on the...

Страница 41: ...Refer to Paragraph 3 3 3 for fuse replacement instructions Fuses are slow blow time delay type and should always be the value specified in Table 3 1 Fuse values are also printed on the rear panel of t...

Страница 42: ...nt is OFF Do not remove instrument covers without first disconnecting the power cord even if the instrument power switch is off 3 4 STANDARD SENSOR INPUTS This paragraph details how to connect sensors...

Страница 43: ...tor It should not be terminated at the opposite end of the cable The shield should not be connected to earth ground on the instrument chassis or in the cooling system NOTE The shell of the connector i...

Страница 44: ...the cooling system Use similar technique for heater leads Use a grounded receptacle for the instrument power cord Consider ground strapping the instrument chassis to other instruments or computers 3 5...

Страница 45: ...340 is a current source and has protection that prevents it from being damaged even if shorted The heater fuse on the rear panel of the instrument is there to provide one more level of protection for...

Страница 46: ...by the Loop 2 output is calculated as P V Rheater 2 The output is rated for no more than 100 mA of current so for the maximum of 1 W output power use a 100 resistive heater with a power rating greate...

Страница 47: ...d control applications See Figure 3 5 Their most basic function is a temperature monitor where they put out a voltage that is proportional to temperature They can be configured to monitor the output o...

Страница 48: ...d controlled directly by the user from the front panel or over computer interface Refer to Paragraph 7 4 The relay status indicated on the relays and beeper screen is for monitoring the relay status I...

Страница 49: ...ent does not respond to keys being pressed If any of these symptoms are observed please contact the factory Messages that indicate the need for further setup are common when first powering up the unit...

Страница 50: ...s Some error conditions are part of normal operation and do not prevent the instrument from operating Error messages for these will be shown on the normal display and the instrument will continue to o...

Страница 51: ...eters NOTE Within setting screens press Save Screen to accept the entire screen Press Cancel Screen or let the keypad time out to return the screen parameters to pre setting values Use the s or t key...

Страница 52: ...a temperature response curve curve identification information is entered like a setting screen then the curve data is entered in a long table 4 4 5 The Help Key The Help key at the lower right corner...

Страница 53: ...sor type and curve number Other sensor parameters can be overwritten but this changes sensor status to Special Only curves appropriate to the sensor type display SoftCal Displays the SOFTCAL screen wh...

Страница 54: ...lay This section discusses the display fields that can be configured using the Display Format key 4 5 1 Number of Readings Displayed The Model 340 can display between one and eight input readings at a...

Страница 55: ...hown on the normal display The hidden parameters can be viewed by pressing the Loop 1 or Loop 2 key they will also appear when being changed Loop 1 Displays Loop 1 parameters including P I D and Manua...

Страница 56: ...a florescent tube as a backlight The backlight is powered with a high voltage supply operating at 30 kHz Some experiments are sensitive to noise in the frequency range of 30 kHz so the backlight powe...

Страница 57: ...xcitation Range Temp Coefficient Update Silicon Diode volts 10 A 0 2 5 V Negative 20 Hz GaAlAs Diode volts 10 A 0 7 5 V Negative 20 Hz Platinum 100 250 ohms 1 mA 0 250 Positive 20 Hz Platinum 100 500...

Страница 58: ...ay from the leads Even in a well designed system thermal EMF voltages can be an appreciable part of a low voltage sensor measurement The Model 340 can help with a thermal correction algorithm The inst...

Страница 59: ...wish to turn off an input This can be done from the input setup screen If an input that has been turned off is chosen for the display the DISABLE message will appear in the reading field To turn an i...

Страница 60: ...sor input The filter is designed to prevent electronic noise that is picked up on the sensor lead wires from showing on the display It is enabled or disabled for all of the reading formats of an input...

Страница 61: ...put Press the Enter key or the Next Setting key to display the Max Min parameters for that input Press the Next Setting key until the Max Min enable field is highlighted and then use s or t key to sel...

Страница 62: ...y to select one of the two equations from the highlighted equation field Press the Next Setting key and continue to select parameter settings for M X and B A number setting field will appear next to t...

Страница 63: ...ce the individual input channels have a designated curve the user can manually select the channel to be scanned The Model 340 can set its digital outputs to the corresponding scan channel If the exter...

Страница 64: ...Save Screen key to store the setting in the Model 340 Please note that only input channels that have been enabled on the input setup screen will be read in sequence The default setting is 2 The digita...

Страница 65: ...control is described in Paragraph 6 9 Setting a setpoint and setpoint units are described in Paragraph 6 10 Setpoint ramping is described in Paragraph 6 11 Control output is described in Paragraph 6...

Страница 66: ...Next Setting key The control setup parameters for that loop appear on the screen Press the Next Setting key until the Enable field is highlighted Use the s or t key to select ON for enabled or OFF fo...

Страница 67: ...equired the user must change the control parameters depending on the setpoint temperature The Model 340 offers several options for doing so including zone control AutoTune or internal programming Tabl...

Страница 68: ...r the Escape key to return to the previous setting The default setting is 0 6 6 4 Manual Output Manual output is a manual setting of control output It can function in two different ways depending on c...

Страница 69: ...ct AutoTune mode press the AutoTune key The AUTOTUNE screen appears with the control loop indicator highlighted in the upper left hand corner of the screen Use the s or t key to select Loop 1 or 2 Pre...

Страница 70: ...Zone Setting WorkSheet Heater Range Manual Output Gain P Reset I Rate D Heater Range Manual Output Gain P Reset I Rate D Heater Range Manual Output Gain P Reset I Rate D Heater Range Manual Output Ga...

Страница 71: ...ts need not match setpoint units When changing setpoint units while the control loop is active the Model 340 converts the control setpoint to the new control units for minimal disruption in control ou...

Страница 72: ...n Press the Next Setting key until the Ramp field is highlighted Use the s or t key to turn the ramp feature OFF Press the Save Screen key to stop the ramp Another method to stop the ramp is to press...

Страница 73: ...maximum power computed with the maximum current setting and user specified resistance If the power does not change when you change the range the voltage compliance is limiting the maximum power If ra...

Страница 74: ...put as a source for an Analog Output press the Analog Outputs key The analog output indicator is highlighted in the upper left hand corner Use the s or t key to select analog output 2 Press the Enter...

Страница 75: ...The rising slope limit is shown as Slope the falling slope limit is shown as Slope Both are set in percent of output current per second The setting range is 0 to 100 with a resolution of 0 1 To change...

Страница 76: ...Lake Shore Model 340 Temperature Controller User s Manual 6 12 Temperature Control Operation This Page Intentionally Left Blank...

Страница 77: ...instrument causes noise on the internal circuits The analog output connector and pinouts are shown in Figure 10 5 To set up an analog output first select an operating mode Other parameters depend on...

Страница 78: ...sensitivity is 0 01 V K or 10 mV K If the application does not require a wide temperature range the user can change the value of the low and high parameters to improve sensitivity This setup has a nar...

Страница 79: ...information about the digital signals is provided in Paragraph 3 7 The digital signal lines are protected against short circuit and over voltage but it is not recommended to expose the terminals to ES...

Страница 80: ...than the low alarm setting the low alarm is active for the input The alarm feature can be enabled or disabled for each individual input Active alarms are indicated on the display with an annunciator T...

Страница 81: ...Screen key to store the changes The default values are Low 0 0 and High 1000 7 3 4 Input Alarm Latching To enable an alarm latching press the Alarm Setup key The ALARM SETTINGS screen appears with the...

Страница 82: ...rface Relay parameters are shown on the Relays and Beeper Setup screen which is accessed by pressing the Options key then pressing the More key The relay and beeper Status shown on the right side of t...

Страница 83: ...ata pairs breakpoints including a value in sensor units and a corresponding value in Kelvin Using fewer than 200 breakpoints will not increase the number of available curve locations SoftCal generated...

Страница 84: ...ance vs Kelvin 4 log R 0 00001 log R log R log K log Resistance vs log Kelvin 4 log R 0 00001 log R mV K mV vs Kelvin 100 mV 0 00001 mV Coeff Enter an appropriate temperature for proper temperature co...

Страница 85: ...nloading procedure is provided in Paragraph 8 4 To copy a curve press the Curve Entry key Press the Next Setting key until Copy curve is selected then press the Enter key Change to the desired curve n...

Страница 86: ...f the user buys the CalCurve service with the calibrated sensor the factory generates the curve for later entry like any other curve 8 2 1 SoftCal and Silicon Diode Sensors Lake Shore Silicon Diode Se...

Страница 87: ...rd because of its consistent and repeatable temperature response above 30 K SoftCal gives platinum sensors better accuracy than their nominal matching to the DIN 43760 curve Use one two or three calib...

Страница 88: ...s are for timing and decision making The instrument can run the instructions in an internal program without operator interaction Since program status can be monitored with a computer interface interna...

Страница 89: ...e control mode the control parameters including heater range are updated as the setpoint temperature changes through new zones Setpoint ramps in an internal program override the stand alone setpoint r...

Страница 90: ...de Loop 1 control mode P I D Loop 1 control parameters Set with zone feature if zone control mode is selected above Htr Range Loop 1 heater output range Set maximum heater current before running an in...

Страница 91: ...ions called a subprogram may be entered into a program location Another program called a main program can call one or more subprograms in any sequence A subprogram must occupy an entire program locati...

Страница 92: ...lves The left half is a list of instructions in the program location and the right half shows parameters for a single instruction when the instruction is highlighted Enter instructions like any other...

Страница 93: ...left side P Paste Insert the previously deleted instruction when on the left side 8 3 6 Example of an Internal Program Example 1 This example illustrates the typical use of an internal program It repr...

Страница 94: ...inutes 0 Seconds 30 3 Relays High OFF Low OFF 4 End 8 3 8 Run an Internal Program To run a program already entered into memory press the Program key Use the Next Setting key to highlight Run program P...

Страница 95: ...time Data is taken in groups called records Each record consists of a timestamp and up to four points of data in any combination of the input readings setpoints or control outputs The Model 340 can ut...

Страница 96: ...Changing Type will erase stored records Input Specifies Input channel to log This field is available only if Input is specified in the Type field Note Changing Input will erase stored records Source S...

Страница 97: ...rom 0 to 255 Each bit has its own meaning as shown below Bit 7 1 Input is DISABLed Bit 6 1 Input has NOCURVe Bit 5 1 Input is S OVER Bit 4 1 Input is S ZERO Bit 3 1 Input is T OVER Bit 2 1 Input is T...

Страница 98: ...key the erasure is canceled D a ta L o g g in g R e a d D a ta C a r d W r ite D a ta C a r d E r a s e D a ta C a r d C a r d 12 8 K B F la s h M 3 4 0 C o n f ig D A T A C A R D C o n f ig u r a tio...

Страница 99: ...igital computer which tells the Model 340 which functions to perform The IEEE 488 interface capabilities of the Model 340 Controller are listed below as well as in mnemonic format on the rear panel of...

Страница 100: ...only the addressed device responds GTL Go To Local The GTL command is used to remove instruments from the remote mode With some instruments GTL also unlocks front panel controls if they were previousl...

Страница 101: ...ke If bits 0 1 2 4 or 5 are set then the corresponding bit in the Status Byte Register is set The Model 340 produces a service request only if bit 6 of the Service Request Enable Register is set If di...

Страница 102: ...l selected pending operations 9 1 4 IEEE Interface Example Programs Two BASIC programs are included to illustrate the IEEE 488 communication functions of the instrument The first program was written i...

Страница 103: ...Lake Shore Model 340 Temperature Controller User s Manual Remote Operation 9 5 Figure 9 1 GPIB Setting Configuration Figure 9 2 DEV 12 Device Template Configuration...

Страница 104: ...Interface Program in Visual Basic 1 Start VB6 2 Choose Standard EXE and select Open 3 Resize form window to desired size 4 On the Project Menu select Add Module select the Existing tab then navigate...

Страница 105: ...or window under the Object dropdown list select General Add the statement Public gSend as Boolean b Double Click on cmdSend Add code segment under Private Sub cmdSend_Click as shown in Table 9 2 c In...

Страница 106: ...nd True Loop until Send button pressed gSend False Set Flag as False strCommand frmIEEE txtCommand Text Get Command strReturn Clear response display strCommand UCase strCommand Set all characters to u...

Страница 107: ...and terminators are CR LF 9 1 4 4 Quick Basic Program The IEEE 488 interface program in Table 9 3 works with QuickBasic 4 0 4 5 or Qbasic on an IBM PC or compatible running DOS or in a DOS window It...

Страница 108: ...the board or device on the GPIB Valid primary addresses range from 0 to 30 00H to 1EH Adding 32 to the primary address forms the Listen Address LA Adding 64 to the primary address forms the Talk Addre...

Страница 109: ...pt The computer transmits to the instrument and displays any response If no query is sent the instrument responds to the last query received Type EXIT to exit the program REM INCLUDE c gpib pc qbasic...

Страница 110: ...lled query without a nothing will be returned Incorrectly spelled commands and queries are ignored Commands and queries should have a space separating the command and associated parameters Leading zer...

Страница 111: ...computer industry For you convenience Lake Shore offers a Model 2001 RJ 11 Cable When combined with either the Model 2002 DB 25 Adapter or Model 2003 DE 9 Adapter this cable assembly can be used to c...

Страница 112: ...One parity bit configured for odd parity is included in each character ASCII letter and number characters are used most often as character data Punctuation characters are used as delimiters to separat...

Страница 113: ...issuing commands only the user program should Properly format and transmit the command including terminators as one string Guarantee that no other communication is started for 50 ms after the last cha...

Страница 114: ...sired size 4 On the Project Menu click Components to bring up a list of additional controls available in VB6 5 Scroll through the controls and select Microsoft Comm Control 6 0 Select OK In the toolba...

Страница 115: ...nt Public gSend as Boolean b Double Click on cmdSend Add code segment under Private Sub cmdSend_Click as shown in Table 9 6 c In the Code Editor window under the Object dropdown list select Form Make...

Страница 116: ...ts Loop Until gSend True Loop until Send button pressed gSend False Set Flag as false strCommand frmSerial txtCommand Text Get Command strReturn Clear response display strCommand UCase strCommand Set...

Страница 117: ...Basic Serial Interface Program CLS Clear screen PRINT SERIAL COMMUNICATION PROGRAM PRINT TIMEOUT 2000 Read timeout may need more BAUD 9600 TERM CHR 13 CHR 10 Terminators are CR LF OPEN COM1 BAUD O 7 1...

Страница 118: ...terface program If you enter a correctly spelled query without a nothing will be returned Incorrectly spelled commands and queries are ignored Commands and queries should have a space separating the c...

Страница 119: ...s A parameter with status as part of the name can use these values 0 off or disabled and 1 on or enabled value A parameter with value as part of the name is specified in floating point format This for...

Страница 120: ...NGE Query Heater Range 40 SETP Set Setpoint 41 SETP Query Setpoint 41 Command Function Page SETTLE Set Loop 1 Settle 41 SETTLE Query Loop 1 Settle 41 TUNEST Query Tuning Status 42 ZONE Set Zone 42 ZON...

Страница 121: ...event flag bit send the command ESE with the sum of the bit weighting for each desired bit See the ESR command for a list of event flags Example To enable event flags 0 3 4 and 7 send the command ESE...

Страница 122: ...the Status Byte Register To enable a status flag bit send the command SRE with the sum of the bit weighting for each desired bit See the STB command for a list of status flags Example To enable statu...

Страница 123: ...ch enable Specifies a latched alarm remains active after alarm condition correction relay enable Specifies how the activated alarm affects relays NOTE Does not guarantee the alarm activates the relays...

Страница 124: ...analog output 1 to manual mode with 25 5 output 2 55 V ANALOG 2 0 1 A 1 100 0 0 0 term Sets analog output 2 to monitor Input A kelvin reading with 100 0 K at 100 output 10 0 V and 0 0 K at 0 output 0...

Страница 125: ...ge output enable Disables or enables the large output display Example CDISP 1 1 25 0 1 term Control Loop 1 displays using 25 to determine maximum power output The output displays in current and in lar...

Страница 126: ...nn n nnn n n n term Remarks Returns parameters for control loop limits See the CLIMIT command for parameter descriptions loop specifies which loop to query CMODE Configure Control Loop Mode Input CMOD...

Страница 127: ...characters format Specifies the curve data format Valid entries 1 mV K 2 V K 3 K 4 log K 5 log log K limit value Specifies the curve temperature limit in kelvin coefficient Specifies the curves tempe...

Страница 128: ...or off powerup enable Specifies whether the control loop is on or off after power up Example CSET 1 A 1 1 term Control Loop 1 controls off of Input A with setpoint in kelvin CSET Query Control Loop P...

Страница 129: ...Returned input data source Format ann n term Remarks Returns the parameters for a displayed field See the DISPFLD command for parameter descriptions field specifies which field to query Valid entries...

Страница 130: ...ts window Format a nn nn term Remarks Returns input filter configuration See the FILTER command for parameter descriptions input specifies which input to query HTR Query Heater Output Input HTR Return...

Страница 131: ...s only valid with NTC resistor or special Example INSET A 1 term Turns on compensation for Input A INSET Query Input Hardware Setup Parameters Input INSET input Returned enable compensation Format n n...

Страница 132: ...input input specifies which input to query LDAT Query Linear Equation Data for an Input Input LDAT input Returned linear value Format nnn nnnE n term Remarks Returns the linear equation data for an i...

Страница 133: ...rned Nothing Remarks Turns data logging on and off stop start 0 stop 1 start LOG Query Data Logging Status Input LOG Returned off on Format n term Remarks Returns data logging status 0 stopped 1 loggi...

Страница 134: ...LOGVIEW record point Returned timestamp point data The format of point data varies depending on the point type specified by point See DATETIME command for the timestamp parameters format 1 point type...

Страница 135: ...MNMX B 1 3 term Input B min max function is on and processes data from the input sensor units reading MNMX Query Minimum and Maximum Input Function Parameters Input MNMX input Returned on pause source...

Страница 136: ...e 9 Ramp SP Rel deviation value hours minutes seconds rate 10 Parameters control channel control mode P value I value D value heater range 11 Digital Output bit weighting 12 Relays high enable low ena...

Страница 137: ...arameter descriptions loop specifies which loop to query RAMP Configure Control Loop Ramp Parameters Input RAMP loop off on rate value Returned Nothing Remarks Configures the control loop ramp loop Sp...

Страница 138: ...tries 1 high and 2 low mode Specifies relay settings mode Valid entries 0 off 1 alarms 2 manual off on Specifies the manual relay settings if mode 2 Example RELAY 1 2 1 term Manually turns on the high...

Страница 139: ...TP Configure Control Loop Setpoint Input SETP loop value Returned Nothing Remarks Configures the control loop setpoint loop Specifies which loop to configure value The value for the setpoint in whatev...

Страница 140: ...rnal scanner mode configuration See the XSCAN command for parameter descriptions ZONE Configure Control Loop Zone Table Parameters Input ZONE loop zone top value P value I value D value mout value ran...

Страница 141: ...tandard inputs 3464 Dual Thermocouple Input Option Card Adds two thermocouple inputs to the Model 340 A microprocessor on the card manages the A D and communication with the Model 340 3465 Single Capa...

Страница 142: ...to use the ground terminals provided but in certain circumstances it can help to reduce the noise Shorting out the filter input or output with the controller driving it turned on is not recommended a...

Страница 143: ...el chromium resistance wire magnesium oxide insulation two solid pins non magnetic package and has UL and CSA component recognition The heater is 50 watt 6 35 mm 0 25 inch diameter by 25 4 mm 1 inch l...

Страница 144: ...Optional Model 2002 RJ 11 to DB 25 Adapter 1 Rack Mount Ear 107 049 2 2 Screw 6 32 x 1 2 Inch 0 035 4 FHMS Phillips 3 Rack Mount Handle 107 433 2 4 Screw 8 32 x 3 8 inch 0 081 4 FHMS Phillips Item Des...

Страница 145: ...and bottom cover screws instruments may have 1 or 2 screws on the top and bottom covers 4 Remove rear plastic bezel The covers are tracked Slide the top and bottom covers to the rear on the tracks to...

Страница 146: ...t and above the Digital Option plug J9 Ignore hole to left and beneath Hole 4 Into each hole insert a 4 40 screw through the bottom of the circuit board and thread it into a metal standoff on the top...

Страница 147: ...ighlight the Disp field Use the s or t key to scroll through the inputs 10 3 3 Specifications The 3462 Option Card input specifications are the same as for standard inputs on the Model 340 main board...

Страница 148: ...DT0 C0 E1 RELAYS NC C NO NC C NO LO HI HEATER FUSE 2 5 A HEATER OUTPUT LO HI DATA CARD FUSE DATA 10 5 50 60 Hz 175 VA MAX LINE 100 120 2 0 A 25x1 25in SB 220 240 1 0 A 5x25mm SB OFF ON INPUT A l V l V...

Страница 149: ...the terminal block Twisting the thermocouple wires helps reject noise If shielding is necessary extend the shield from the oven or cryostat to cover the thermocouple wire but do not attach the shield...

Страница 150: ...re range for some thermocouple types may extend below 1 K or above 1000 K The input voltage of the 3464 is limited to 50 mV so any part of the curve that extends beyond 50 mK is not usable by the inst...

Страница 151: ...splayed temperature Standard laboratory practices are expected the temperature at the top of a dewar of liquid nitrogen is different from the bottom If the temperature display is not as expected check...

Страница 152: ...OR INSTALLATION 10 5 2 1 Sensor Input Connector A six pin connector on the 3465 attaches the four sensor leads and shields Capacitance temperature sensors are commonly two lead devices but four lead m...

Страница 153: ...nd a negative temperature coefficient at warmer temperature Sensor data sheets detail where the coefficient changes There is often a temperature range where the sensor is not usable Temperature contro...

Страница 154: ...is installed in a Model 340 press Options and then press More three times Option identification displays on the REVISION INFORMATION screen If options are changed the Model 340 changes all parameter...

Страница 155: ...setting screens when available For an example of option input selection press Input Setup to display the INPUT SETUP screen Use the Up Arrow and Down Arrow keys to select inputs A B C or D Select C or...

Страница 156: ...NTYPE input input Specifies input to query C or D Returned type units coefficient excitation range type See the INTYPE command units Sensor units 1 volts 2 ohms coefficient Temperature coefficient 1 n...

Страница 157: ...V 1 mK at 10 K 16 mK at 77 K 10 mK at 300 K 10 mK at 475 K 2 m 10 6 mK at 30 K 10 mK at 77 K 10 mK at 300 K 10 mK at 675 K 10 mK at 800 K 20 m 10 6 mK at 30 K 10 mK at 77 K 10 mK at 300 K 10 mK at 800...

Страница 158: ...Lake Shore Model 340 Temperature Controller User s Manual 10 18 Options and Accessories This Page Intentionally Left Blank...

Страница 159: ...equipment damage If a test connection to energized equipment is required make the test equipment ground connection before probing the voltage or signal to be tested Do not install or service equipment...

Страница 160: ...torage of ESD material 6 Do not handle ESDS devices unnecessarily or remove them from packaging until actually used or tested 11 3 GENERAL MAINTENANCE If there is no power ensure you are plugged into...

Страница 161: ...0 mA max 9 DI1 Digital Input 1 TTL Input 10 DI2 Digital Input 2 TTL Input 11 DI3 Digital Input 3 TTL Input 12 DI4 Digital Input 4 TTL Input 13 DI5 Digital Input 5 TTL Input 14 15 V 15 Volt Output 50 m...

Страница 162: ...UT 1 2 BNC Rear Panel Connector Details INPUT A INPUT B I I V V I I V V 1 2 3 4 5 6 1 2 3 4 5 6 PIN SYMBOL DESCRIPTION 1 2 3 4 5 6 I V none V I none Current Voltage Driven Shield or Guard Voltage Curr...

Страница 163: ...nd signal names as views from the rear panel of the controller 11 12 10 9 8 7 6 5 4 3 2 1 23 24 22 21 20 19 18 17 16 15 14 13 IEEE 488 INTERFACE SH1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1 C 340 11 7 eps...

Страница 164: ...3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 Not Used 6 5 4 3 2 1 DB 25 Connector RJ 11 Receptacle RxD Gnd TxD For Customer supplied computer with DB 25 Serial Interface Connector configured as DCE If th...

Страница 165: ...to unit 6 If required reattach 19 inch rack mounting brackets 7 Connect power cord to rear of unit and set power switch to On l 11 7 EPROM AND NOVRAM REPLACEMENT Part of the operating software for the...

Страница 166: ...the curve System board error messages The slave input processor is not responding The curve FLASH chip is not responding Flash error code XXH Write down the error code number and call Lake Shore Serv...

Страница 167: ...TION SCREEN displays the current firmware revision information for both Master and Input processors If the instrument displays no version numbers please contact Lake Shore Instrumentation Service Depa...

Страница 168: ...into the device 10 Note the orientation of the notch on the M340MN Flash Memory U26 and M340SV EEPROM Memory U146 chips Gently pry the chips from both ends Once removed install the new memory chips wi...

Страница 169: ...y until the REVISION INFORMATION SCREEN displays the current firmware revision information for both Master and Input processors If the instrument displays no version numbers please contact Lake Shore...

Страница 170: ...Lake Shore Model 340 Temperature Controller User s Manual 11 12 Service This Page Intentionally Left Blank...

Страница 171: ...0191 0 11356 0 12547 0 13759 0 14985 0 16221 0 17464 0 18710 0 19961 0 22463 0 24964 0 27456 0 28701 0 32417 0 36111 0 41005 0 44647 0 45860 0 50691 0 51892 0 55494 0 60275 0 63842 0 67389 0 70909 0 7...

Страница 172: ...9260 0 73440 0 84490 0 92570 0 99110 1 02840 1 07460 1 08480 1 09090 1 09810 1 10800 1 11500 1 12390 1 13650 1 15590 1 18770 1 23570 1 33170 1 65270 1 96320 2 17840 2 53640 2 59940 2 65910 Table A 3 S...

Страница 173: ...22 5 125 5 128 5 131 5 134 5 137 5 140 5 144 147 5 151 154 5 158 161 5 165 168 5 172 176 180 184 188 192 196 200 5 205 209 5 214 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118...

Страница 174: ...989110 6 855790 6 720200 6 582330 6 442220 6 299900 6 155400 6 008740 5 859960 5 687430 5 512090 5 334130 5 153520 4 970330 4 784590 4 596330 4 405600 4 212440 3 992330 3 769140 3 543070 3 314120 3 0...

Страница 175: ...093440 4 004430 3 913940 3 821970 3 728520 3 633620 3 537260 3 439460 3 340240 3 239610 3 122930 3 004370 2 884040 2 761910 2 638010 2 512340 2 384920 2 255770 2 124900 1 992320 1 858060 1 705090 1 54...

Страница 176: ...0639 2 42737 3 5 6 35 8 15 9 75 12 5 16 95 19 3 22 2 26 29 1 31 3 34 5 36 3 49 8 55 4 60 5 65 5 70 5 76 80 85 5 89 5 90 5 94 95 5 100 110 120 130 140 150 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 4...

Страница 177: ...0 2 877550 2 776950 2 675700 2 563610 2 450770 2 337230 2 223010 2 097700 1 971630 1 844890 1 706840 1 568040 1 428520 1 277520 1 114900 0 940599 0 754604 0 556906 0 358437 0 170179 0 041150 0 152699...

Страница 178: ...5 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1 01064 1 02125 1 03167 1 04189 1 05192 1 06277 1 07472 1 09110 1 09602 1 10014 1 10393 1 10702 1 10974 1 11204 1 11414 1 1...

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