Lakeshore 325 User Manual Download Page 2

Lake Shore Model 335 Temperature Controller User’s Manual 

LIMITED WARRANTY STATEMENT 

WARRANTY PERIOD: THREE (3) YEARS 

1.

Lake Shore warrants that products manufactured by Lake Shore (the "Product") will be free from defects in materials and workmanship for 
three years from the date of Purchaser's physical receipt of the Product (the "Warranty Period"). If Lake Shore receives notice of any such 
defects during the Warranty Period and the defective Product is shipped freight prepaid back to Lake Shore, Lake Shore will, at its option, 
either repair or replace the Product (if it is so defective) without charge for parts, service labor or associated customary return shipping cost 
to the Purchaser. Replacement for the Product may be by either new or equivalent in performance to new. Replacement or repaired parts, or 
a replaced Product, will be warranted for only the unexpired portion of the original warranty or 90 days (whichever is greater).

2.

Lake Shore warrants the Product only if the Product has been sold by an authorized Lake Shore employee, sales representative, dealer or an
authorized Lake Shore original equipment manufacturer (OEM).

3.

The Product may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use when it is
originally sold to the Purchaser.

4.

The Warranty Period begins on the date of Purchaser's physical receipt of the Product or later on the date of operational training and 
verification (OT&V) of the Product if the service is performed by Lake Shore, provided that if the Purchaser schedules or delays the Lake 
Shore OT&V  for more than 30 days after delivery then the Warranty Period begins on the 31st day after Purchaser's physical receipt of the 
Product.

5.

This limited warranty does not apply to defects in the Product resulting from (a) improper or inadequate installation (unless OT&V services
are performed  by Lake Shore), maintenance, repair or calibration, (b) fuses, software, power surges, lightning and non-rechargeable 
batteries, (c) software, interfacing, parts or other supplies not furnished by Lake Shore, (d) unauthorized modification or misuse, (e) 
operation outside of the published specifications, (f) improper site preparation or site maintenance (g) natural disasters such as flood, fire,
wind, or earthquake, or (h) damage during shipment other than original shipment to you if shipped through a Lake Shore carrier.

6.

This limited warranty does not cover: (a) regularly scheduled or ordinary and expected recalibrations of the Product; (b) accessories to the 
Product (such as probe tips and cables, holders, wire, grease, varnish, feed throughs, etc.); (c) consumables used in conjunction with the 
Product (such as probe tips and cables, probe holders, sample tails, rods and holders, ceramic putty for mounting samples, Hall sample 
cards, Hall sample enclosures, etc.); or, (d) non-Lake Shore branded Products that are integrated with the Product.

7.

To the extent allowed by applicable law,, this limited warranty is the only warranty applicable to the Product and replaces all other 
warranties or conditions, express or implied, including, but not limited to, the implied warranties or conditions of merchantability and
fitness for a particular purpose. Specifically, except as provided herein.
Lake Shore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products. 
Any implied warranty is limited in duration to the warranty period.  No oral or written information, or advice given by the Company, its
Agents or Employees, shall create a warranty or in any way increase the scope of this limited warranty. Some countries, states or provinces
do not allow limitations on an implied warranty, so the above limitation or exclusion might not apply to you. This warranty gives you
specific legal rights and you might also have other rights that vary from country to country, state to state or province to province. 

8.

Further, with regard to the United Nations Convention for International Sale of Goods (CISC,) if CISG is found to apply in relation to this
agreement, which is specifically disclaimed by Lake Shore, then this limited warranty excludes warranties that: (a) the Product is fit for the 
purpose for which goods of the same description would ordinarily be used, (b) the Product is fit for any particular purpose expressly or 
impliedly made known to Lake Shore at the time of the conclusion of the contract, (c) the Product is contained or packaged in a manner 
usual for such goods or in a manner adequate to preserve and protect such goods where it is shipped by someone other than a carrier hired
by Lake Shore.

9.

Lake Shore disclaims any warranties of technological value or of non-infringement with respect to the Product and Lake Shore shall have 
no duty to defend, indemnify, or hold harmless you from and against any or all damages or costs incurred by you arising from the 
infringement of patents or trademarks or violation or copyrights by the Product.

10.

THIS WARRANTY IS NOT TRANSFERRABLE. This warranty is not transferrable.

11.

Except to the extent prohibited by applicable law, neither Lake Shore nor any of its subsidiaries, affiliates or suppliers will be held liable for 
direct, special, incidental, consequential or other damages (including lost profit, lost data, or downtime costs) arising out of the use, inability 
to use or result of use of the product, whether based in warranty, contract, tort or other legal theory, regardless whether or not Lake Shore 
has been advised of the possibility of such damages.  Purchaser's use of the Product is entirely at Purchaser's risk. Some countries, states and
provinces do not allow the exclusion of liability for incidental or consequential damages, so the above limitation may not apply to you.

12.

This limited warranty gives you specific legal rights, and you may also have other rights that vary within or between jurisdictions where the 
product is purchased and/or used.  Some jurisdictions do not allow limitation in certain warranties, and so the above limitations or 
exclusions of some warranties stated above may not apply to you.

13.

Except to the extent allowed by applicable law, the terms of this limited warranty statement do not exclude, restrict or modify the 
mandatory statutory rights applicable to the sale of the product to you.

Summary of Contents for 325

Page 1: ...al support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods and apparatus disclosed herein ma...

Page 2: ...s express or implied including but not limited to the implied warranties or conditions of merchantability and fitness for a particular purpose Specifically except as provided herein Lake Shore underta...

Page 3: ...at the user s risk Lake Shore will assume no responsibility for damage or errors incurred as result of any changes made to the firmware Under the terms of this agreement you may only use the Model 325...

Page 4: ...Lake Shore Model 325 Temperature Controller User s Manual...

Page 5: ...and interface cables attached If the installation and operating instructions in the User s Manual are followed there should be no degradation in EMC performance This instrument is not intended for us...

Page 6: ......

Page 7: ...terials 2 4 2 3 2 Sensor Location 2 4 2 3 3 Thermal Conductivity 2 4 2 3 4 Contact Area 2 4 2 3 5 Contact Pressure 2 5 2 3 6 Lead Wire 2 5 2 3 7 Lead Soldering 2 6 2 3 8 Heat Sinking Leads 2 6 2 3 9 T...

Page 8: ...Output Wiring 3 7 3 6 4 Loop 1 Heater Output Noise 3 8 3 6 5 Loop 2 Output 3 8 3 6 6 Loop 2 Output Resistance 3 8 3 6 7 Loop 2 Output Connector 3 8 3 6 8 Loop 2 Heater Protection 3 8 3 6 9 Boosting th...

Page 9: ...akpoints 5 1 5 2 FRONT PANEL CURVE ENTRY OPERATIONS 5 3 5 2 1 Edit Curve 5 3 5 2 1 1 Thermocouple Curve Considerations 5 5 5 2 2 Erase Curve 5 5 5 2 3 Copy Curve 5 6 5 3 SOFTCAL 5 6 5 3 1 SoftCal With...

Page 10: ...tatic Discharge Sensitive Components 8 3 8 7 REAR PANEL CONNECTOR DEFINITIONS 8 4 8 7 1 Serial Interface Cable Wiring 8 6 8 7 2 IEEE 488 Interface Connector 8 7 8 8 TOP OF ENCLOSURE REMOVE AND REPLACE...

Page 11: ...ture Ranges for Silicon Diode Sensors 5 7 5 2 SoftCal Temperature Ranges for Platinum Sensors 5 8 6 1 Model 325 Status System 6 4 6 2 Standard Event Status Register 6 6 6 3 Operation Event Register 6...

Page 12: ...rial Interface Specifications 6 15 6 7 Serial Interface Program Control Properties 6 18 6 8 Visual Basic Serial Interface Program 6 19 6 9 Command Summary 6 22 8 1 Calibration Table for Diode Ranges 8...

Page 13: ...instrument functions for quiet and repeatable sensor measurements The Model 325 also uses current reversal to eliminate thermal EMF errors in resistance sensors Sensor data from each input is updated...

Page 14: ...heater power at the 50 setting or 1 W at the 25 setting When not being used for temperature control the loop 2 heater output can be used as a manually controlled voltage source The output voltage can...

Page 15: ...tor is underlined to indicate which channel is being controlled by the displayed control loop Normal Default Display Configuration The display provides four reading locations Readings from each input...

Page 16: ...A B 1500 2 6 K to 100 K3 Not Recommended Germanium GR 200A B 2500 3 1 K to 100 K3 Not Recommended Carbon Glass CGR 1 500 4 K to 325 K4 T 2 K to 19 T Carbon Glass CGR 1 1000 5 K to 325 K4 T 2 K to 19 T...

Page 17: ...ll Scale PT 103 with 1 4J calibration 30 K 3 660 0 191 K 10 5 mK 23 mK 33 mK 21 mK 77 K 20 38 0 423 K 4 8 mK 15 mK 27 mK 9 6 mK 300 K 110 35 0 387 K 5 2 mK 39 mK 62 mK 10 4 mK 500 K 185 668 0 378 K 5...

Page 18: ...moved during calibration 5 Accuracy specification does not include errors from room temperature compensation Thermometry Number of inputs 2 Input configuration Each input is factory configured for eit...

Page 19: ...Heater Output Type Variable DC voltage source D A resolution 16 bit 25 Setting 50 Setting Max power 1 W 2 W Max voltage 5 V 10 V Current compliance min 0 2 A 0 2 A Heater load range 25 50 Heater load...

Page 20: ...ocouple input 325 T2 Two thermocouple inputs Refer to Chapter 7 of this manual for a complete description of Model 325 options and accessories Specifications subject to change without notice 1 3 SAFET...

Page 21: ...n an Explosive Atmosphere Do not operate the instrument in the presence of flammable gases or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard K...

Page 22: ...Lake Shore Model 325 Temperature Controller User s Manual 1 10 Introduction This Page Intentionally Left Blank...

Page 23: ...g to consider when choosing a temperature sensor is that instruments like the Model 325 are not able to read some sensors over their entire temperature range Lake Shore sells calibrated sensors that o...

Page 24: ...e National Physical Laboratory in Great Britain These standards allow Lake Shore to calibrate sensors from 50 mK to above room temperature Calibrated sensors are more expensive than uncalibrated senso...

Page 25: ...ve way to get reasonable temperature accuracy Sensors that have a standard curve are often used when interchangeability is important Some individual sensors are selected for their ability to match a p...

Page 26: ...k apart potentially damaging them The thermal expansion or contraction of rigid clamps or holders could crush fragile samples or sensors that do not have the same coefficient Thermal conductivity is a...

Page 27: ...ificant length of lead wire must be added to the sensor for proper heat sinking and connecting to a bulk head connector at the vacuum boundary The lead wire must be a good electrical conductor but sho...

Page 28: ...easily made one alternative is to wrap several layers of super insulation aluminized mylar loosely between the vacuum shroud and load This reduces radiation transfer to the sample space 2 4 HEATER SEL...

Page 29: ...recommended 2 5 CONSIDERATION FOR GOOD CONTROL Most of the techniques discussed above to improve cryogenic temperature accuracy apply to control as well There is an obvious exception in sensor locati...

Page 30: ...re them for stable control If difficulty is encountered it is recommended to gain experience with the system at temperatures several degrees away from the limit and gradually approach it in small step...

Page 31: ...al the derivative can work to boost the output when the setpoint changes quickly reducing the time it takes for temperature to reach the setpoint It can also see the error decreasing rapidly when the...

Page 32: ...Lake Shore Model 325 Temperature Controller User s Manual 2 10 Cooling System Design P 325 2 3 bmp Figure 2 3 Examples of PID Control...

Page 33: ...o require two or more heater ranges for good control over their full temperature Lower heater ranges are normally needed for lower temperature The Model 325 is of no use controlling at or below the te...

Page 34: ...point changes that raise the temperature act differently than changes that lower the temperature If it was not possible to measure the oscillation period of the load during proportional setting start...

Page 35: ...ould be expected much larger lags can be a problem System nonlinearity is a problem for both AutoTune and manual tuning It is most commonly noticed when controlling near the maximum or minimum tempera...

Page 36: ...Lake Shore Model 325 Temperature Controller User s Manual 2 14 Cooling System Design This Page Intentionally Left Blank...

Page 37: ...veral parts The items included with the Model 325 are listed below Contact Lake Shore immediately if there is a shortage of parts or accessories Lake Shore is not responsible for any missing items if...

Page 38: ...strument CAUTION Always turn off the instrument before making any rear panel connections This is especially critical when making sensor to instrument connections HI LO 1 3 2 LOOP 1 HEATER OUT HI LO GN...

Page 39: ...replace it with the value and type indicated on the rear panel for the line voltage setting The letter T on the fuse rating indicates that the instrument requires a time delay or slow blow fuse Fuse v...

Page 40: ...for use with a Model 321 or a Model 330 the jumper should be placed in the 321 330 position factory default This provides the output current selected via the front panel input setup function on both P...

Page 41: ...any specified lead assignment for four lead resistors Mixing leads could give a reading that appears correct but is not the most accurate 3 4 5 Four Lead Sensor Measurement All sensors including both...

Page 42: ...h one or two thermocouple sensor inputs being Model 325 T1 or T2 Sensor connection is important when using thermocouples because the measured signal is small Many measurement errors can be avoided wit...

Page 43: ...ower The heater output for Loop 1 is a traditional control output for a cryogenic temperature controller It is a variable DC current source with software settable ranges and limits The heater is confi...

Page 44: ...rating greater than 2 W A 25 heater can be used to provide 1 W of power The 25 setting for Loop 2 changes the output voltage range to allow for control over the entire range of output Using a 25 heat...

Page 45: ...per voltage setting If incorrect refer to Section 8 4 3 Ensure the power switch is in the off O position CAUTION The sensor must be connected to the rear of the unit before applying power to the Tempe...

Page 46: ...ing purposes Press the Setpoint key Press the 7 key twice then press the Enter key Details of setpoint setting are discussed in Section 4 11 77 35 75 35 77 000 0 Off 13 The default setting for the hea...

Page 47: ...Lake Shore Model 325 Temperature Controller User s Manual 3 11 This Page Intentionally Left Blank...

Page 48: ...Lake Shore Model 325 Temperature Controller User s Manual 3 12 This Page Intentionally Left Blank...

Page 49: ...h Control Setup Setpoint PID MHP Zone Settings AutoTune Heater Range and Heater Off Refer to Section 4 6 1 Heater Range For Loop 1 allows selection of High 25 W or Low 2 5 W heater range For Loop 2 al...

Page 50: ...parameters during setting operations and decrements numerical parameter value Escape Terminates a setting function without changing the existing parameter value Press and hold to reset instrument to d...

Page 51: ...ey to accept the new data and advance to the next setting Press the Escape key once to clear the entry twice to return to the normal display Most data entry operations are combined with other settings...

Page 52: ...y be a problem with the line power or the instrument Individual messages in a reading location normally indicate that input setup is required 4 3 DISPLAY FORMAT AND SOURCE UNITS SELECTION In the norma...

Page 53: ...ble the following 295 22 The process is the same for the other three display locations However additional choices are provided for Display Location 3 and 4 being Setpoint and Heater Out respectively I...

Page 54: ...couple mV K Positive Chromel AuFe 0 07 Type E Chromel Constantan Type K Chromel Alumel Type T Copper Constantan Thermo 50mV 50 mV NA Thermocouple Refer to the Lake Shore Temperature Measurement and Co...

Page 55: ...ress the Enter key Select for InputA Type 2 5V 1mA Use the s or t key to cycle through the sensor types shown in Table 4 1 with 2 5V 1mA and 7 5V 1mA being the relevant choices Press the Enter key Pro...

Page 56: ...ersal on or off press the Input Setup key and press the Enter key until the following display appears Select for InputA Reversal Off Resistor sensors have the additional choice of turning current reve...

Page 57: ...ed because it eliminates all sources of error If that is not possible use a thermocouple made from the same wire For less demanding applications a short across the input terminals will suffice If the...

Page 58: ...r for Input A Temp Limit 0K The temperature limit is entered using the numeric keypad which includes the numbers 0 9 The user can set temperature limit in kelvin with a range of 0 to 2999 and a resolu...

Page 59: ...nd 50mV Type T 3 670 K Table D 9 15 AuFe 0 03 Thermo 25mV and 50mV AuFe 0 03 3 5 500 K Table D 10 16 AuFe 0 07 Thermo 25mV and 50mV AuFe 0 07 3 15 610 K Table D 11 17 Reserved 18 Reserved 19 Reserved...

Page 60: ...s 21 through 35 Data points for thermocouple curves are detailed in Tables D 7 through D 11 in Appendix D Press the Enter key until you see the curve selection screen shown below Select for InputA Cur...

Page 61: ...ol Loops The Model 325 is capable of running two simultaneous control loops Their capabilities are compared in Table 4 3 As shown there the primary difference between the two loops is their control ou...

Page 62: ...only the heater range and MHP Output parameters are active the setpoint control sensor and PID parameters are ignored This type of control guarantees constant power to the load but it does not activel...

Page 63: ...he following setpoint units Temp K Temp C and Sensor where K kelvin C degrees Celsius and Sensor volts V millivolts mV or ohms Press the Enter key The Model 325 has two control modes Closed Loop and O...

Page 64: ...parameters to provide three term PID control Manual heater power output can be set manually in open loop and closed loop control modes For details on PID tuning refer to Section 2 7 To place the cont...

Page 65: ...Press the Enter key to save changes and return to the normal display 4 8 3 Manually Setting Derivative D The derivative parameter sometimes called rate is the D part of the PID control equation The r...

Page 66: ...does not set the manual heater power output or heater range The control sensor must have a valid temperature response curve assigned to it An appropriate heater range must also be determined as descr...

Page 67: ...es and heater ranges Zone control can be active for both control loops at the same time The user should configure the zones using 01 as the lowest to 10 as the highest zone Zone boundaries are always...

Page 68: ...The Derivative D value is entered using the numeric keypad which includes the numbers 0 9 and decimal point Derivative has a range of 0 to 200 percent with a default of 0 Press the Enter key to accep...

Page 69: ...Lake Shore Model 325 Temperature Controller User s Manual Operation 4 21 C 325 4 4 bmp Figure 4 4 Record of Zone Settings...

Page 70: ...n the specifications Section 1 2 The instrument allows a large setpoint range to accommodate a variety of sensors and units With setpoint expressed in sensor units setpoint range is unlimited The user...

Page 71: ...most current setting i e the reading will not jump to the end of the ramp NOTE If the input type or input curve is changed while a ramp is in progress both ramping and the heater are turned off NOTE...

Page 72: ...2 Heater settings Off and On Once the desired heater setting is displayed press the Enter key You will return to the normal display To immediately turn the heater off press the Heater Off key If the H...

Page 73: ...OCKED message To unlock the keypad press and hold the Enter key for 10 seconds to display the screen shown as follows Enter Code To Unlock Keypad Use the numeric keypad to enter the 3 digit lock code...

Page 74: ...return to the normal display 4 18 DEFAULT VALUES It is sometimes necessary to reset instrument parameter values or clear out the contents of curve memory Both are all stored in nonvolatile memory cal...

Page 75: ...e Resistor Configuration Input Type Silicon Diode Curve DT 470 Input Setup Thermocouple Configuration Input Type Thermocouple 25mV Curve Type K Room Comp On Room Cal Cleared Interface Baud 9600 IEEE A...

Page 76: ...Lake Shore Model 325 Temperature Controller User s Manual 4 28 Operation This Page Intentionally Left Blank...

Page 77: ...The format parameter tells the instrument what breakpoint data format to expect Different sensor types require different formats Formats for Lake Shore sensors are V K Volts vs kelvin for diode sensor...

Page 78: ...t A setpoint temperature limit can be included with every curve When controlling in temperature the setpoint cannot exceed the limit entered with the curve for the control sensor The default is 375 K...

Page 79: ...To begin a curve operation press the Curve Entry key and the above selections appear Press the Next Setting key until the desired operation is highlighted and press the Enter key A curve screen appea...

Page 80: ...not be changed Press the Enter key Now that the curve identification parameters are entered it is time to enter curve breakpoints User Curve 21 0 00000v 00 0000 The cursor initially blinks on the curv...

Page 81: ...add 273 15 to the temperature in Celsius The temperature range for some thermocouple types may extend below 1 K or above 1000 K The input voltage of the 325 is limited to 50 mV so any part of the curv...

Page 82: ...rument The following sections describe the data points needed from the user and the expected accuracy of the resulting curves Both DT 400 Series and platinum SoftCal algorithms require a standard curv...

Page 83: ...eratures outside 50 K to 100 K are not allowed This data point improves accuracy between 28 K and 100 K Points 2 and 3 together improve accuracy to room temperature and above Point 3 Calibration data...

Page 84: ...are not allowed Point 3 Calibration data point at a higher temperature 480 K Temperatures outside 400 K to 600 K are not allowed 5 3 4 SoftCal Accuracy with Platinum Sensors A SoftCal calibration is...

Page 85: ...e sensor type is selected press the Enter key You will see the following message Select Write to Curve 21 User NOTE The copy routine allows you to overwrite an existing user curve Please ensure the cu...

Page 86: ...ge of 50 100 K are not permitted For this example we will enter 1 02111 Press the Enter key The cursor will jump to the temperature reading Again use numerical keypad to enter the temperature the meas...

Page 87: ...be a BUS CONTROLLER The BUS CONTROLLER is the digital computer that tells the Model 325 which functions to perform Below are Model 325 IEEE 488 interface capabilities SH1 Source handshake capability R...

Page 88: ...commands A uniline command message asserts only a single signal line The Model 325 recognizes two of these messages from the BUS CONTROLLER Remote REN and Interface Clear IFC The Model 325 sends one...

Page 89: ...e instrument which response to send Queries are issued similar to commands with the computer acting as talker and the instrument as listener The query format is query mnemonic space parameter data ter...

Page 90: ...summary bit for the register set in the Status Byte The user may write to or read from an enable register Each event register bit is logically ANDed to the corresponding enable bit of the enable regis...

Page 91: ...ighted sum of all bits in the register Table 6 1 The actual query commands are described later in this section Table 6 1 Binary Weighting of an 8 Bit Register Position B7 B6 B5 B4 B3 B2 B1 B0 Decimal...

Page 92: ...ves loss of data because the output queue is full Operation Complete OPC Bit 0 When OPC is sent this bit will be set when the instrument has completed all pending operations The operation of this bit...

Page 93: ...indicates that an enabled operation event has occurred Request Service RQS Master Summary Status MSS Bit 6 This bit is set when a summary bit and the summary bits corresponding enable bit in the Serv...

Page 94: ...s Byte summary bit or MAV bit is enabled by the Service Request Enable Register and goes from 0 to 1 bit 6 RQS MSS of the status byte will be set This will send a service request SRQ interrupt message...

Page 95: ...irect the bus controller to look for the SRQ leaving the bus available for other use The MAV bit will be clear whenever the output buffer is empty 6 1 4 3 6 Using Operation Complete OPC and Operation...

Page 96: ...location These files will be used during the development process of a Visual Basic program a Niglobal bas b Vbib 32 bas NOTE If the files in Steps 2 and 3 are not installed on your computer they may b...

Page 97: ...Lake Shore Model 325 Temperature Controller User s Manual Remote Operation 6 11 VB_GPIB_1 bmp Figure 6 5 GPIB Setting Configuration VB_GPIB_2 bmp Figure 6 6 DEV 12 Device Template Configuration...

Page 98: ...aption Default cmdSend Send True Form1 Name Caption frmIEEE IEEE Interface Program 10 Add code provided in Table 6 5 a In the Code Editor window under the Object dropdown list select General Add the s...

Page 99: ...pressed gSend False Set Flag as False strCommand frmIEEE txtCommand Text Get Command strReturn Clear response display strCommand UCase strCommand Set all characters to upper case If strCommand EXIT T...

Page 100: ...led query without a nothing will be returned Incorrectly spelled commands and queries are ignored Commands and queries and should have a space separating the command and associated parameters Leading...

Page 101: ...E near the interface connector stand for Data Terminal Equipment and indicate the pin connection of the directional pins such as transmit data TD and receive data RD Equipment with Data Communications...

Page 102: ...ic space parameter data terminators Query mnemonics are often the same as commands with the addition of a question mark Parameter data is often unnecessary when sending queries Query mnemonics and par...

Page 103: ...gram works with Visual Basic 6 0 VB6 on an IBM PC or compatible with a Pentium class processor A Pentium 90 or higher is recommended running Windows 95 or better with a serial interface It uses the CO...

Page 104: ...tement Public gSend as Boolean b Double click on cmdSend Add code segment under Private Sub cmdSend_Click as shown in Table 6 8 c In the Code Editor window under the Object dropdown list select Form M...

Page 105: ...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...

Page 106: ...u enter a correctly spelled query without a nothing will be returned Incorrectly spelled commands and queries are ignored Commands and queries and should have a space separating the command and associ...

Page 107: ...presented in alphabetical order Sample Command Format Sample Query Format Key Q Begins common interface command Required to identify queries aa String of alphanumeric characters nn String of number c...

Page 108: ...ES Heater Resistance Setting Cmd 6 28 HTRRES Heater Resistance Setting Query 6 28 IEEE IEEE Interface Parameter Cmd 6 28 Command Function Page IEEE IEEE Interface Parameter Query 6 29 INCRV Input Curv...

Page 109: ...for a list of event flags Example To enable event flags 0 4 and 7 send the command QESE 145 term 145 is the sum of the bit weighting for each bit Bit Bit Weighting Event Name 0 1 OPC 4 16 EXE 7 128 PO...

Page 110: ...t has a bit weighting and represents the enable disable mask of the corresponding status flag bit in the Status Byte Register To enable a status flag bit send the command QSRE with the sum of the bit...

Page 111: ...re 1 or 2 mode Specifies the control mode Valid entries 1 Manual PID 2 Zone 3 Open Loop 4 AutoTune PID 5 AutoTune PI 6 AutoTune P Example CMODE 1 4 term Control Loop 1 uses PID AutoTuning CMODE Contro...

Page 112: ...s match the CRVHDR query parameters The temperature coefficient is determined by the first two points in the curve CRVHDR Curve Header Query Input CRVHDR curve term Format nn curve Valid entries 1 36...

Page 113: ...ET loop term Format n loop Specifies which loop to query 1 or 2 Returned input units powerup enable current power term Format a n n n Refer to command for description DFLT Factory Defaults Command Inp...

Page 114: ...command for description HTR Heater Output Query Input HTR loop term Returned heater value term Format nnn n heater value Loop 1 or Loop 2 heater output in percent of current or power depending on sett...

Page 115: ...erm Format a input Specifies which input to query A or B Returned curve number term Format nn Refer to command for description INTYPE Input Type Parameter Command Input INTYPE input sensor type compen...

Page 116: ...K Front Panel Keyboard Lock Command Input LOCK state code term Format n nnn state 0 Unlocked 1 Locked code Specifies lock out code Valid entries are 000 999 Remarks Locks out all front panel entries E...

Page 117: ...set 0 1 to 1000 D value The value for control loop Derivative rate 0 to 200 Remarks Setting resolution is less than 6 digits indicated Example PID 1 10 50 term Control Loop 1 P is 10 and I is 50 PID C...

Page 118: ...t n n loop Specifies loop to configure 1 or 2 range For loop 1 0 Off 1 Low 2 5 W 2 High 25 W For loop 2 0 Off 1 On RANGE Heater Range Query Input RANGE loop term Format n loop Specifies which loop to...

Page 119: ...d temperature point U3 value Specifies third sensor units point Remarks Generates a SoftCal curve Refer to Section 5 3 Example SCAL 1 21 1234567890 4 2 1 6260 77 32 1 0205 300 0 0 5189 term Generates...

Page 120: ...rmat a input Specifies which input to query A or B Returned limit value term Format nnnn TUNEST Control Tuning Status Query Input TUNEST Returned tuning status term Format n 0 no active tuning 1 activ...

Page 121: ...e Parameter Query Input ZONE loop zone term Format n nn loop Specifies which loop to query 1 or 2 zone Specifies which zone in the table to query Valid entries 1 10 Returned top value P value I value...

Page 122: ...Lake Shore Model 325 Temperature Controller User s Manual 6 36 Remote Operation This Page Intentionally Left Blank...

Page 123: ...1011 7 220 V China cord GB 1002 7 2 OPTIONS The list of Model 325 options is provided as follows Model Description of Options 8000 CalCurve on CD or E Mail The Model 8000 CalCurve is offered on CD or...

Page 124: ...N Grease when permanent sensor mountings are desired ID 10 XX Indium Solder Disks Quantity 10 Indium is a semi precious non ferrous metal softer than lead and extremely malleable and ductile It stays...

Page 125: ...7 3 RM 2 Dual Mounting Shelf for Two Model 325 Temperature Controllers Mounting shelf to attach any two 5 25 in tall half rack instruments side by side on a 483 mm 19 in rack mount shelf See Figure 7...

Page 126: ...Lake Shore Model 325 Temperature Controller User s Manual 7 4 Options and Accessories P 325 7 4 jpg Figure 7 2 Model RM 1 2 Rack Mount Kit...

Page 127: ...Lake Shore Model 325 Temperature Controller User s Manual Options and Accessories 7 5 C 325 7 5 bmp Figure 7 3 Model RM 2 Dual Rack Mount Shelf...

Page 128: ...Lake Shore Model 325 Temperature Controller User s Manual 7 6 Options and Accessories...

Page 129: ...Fax 614 818 1600 614 818 1609 Sales Instrument Service Web Service Request http www lakeshore com sup serf html Instrument Service When contacting Lake Shore please provide your name and complete con...

Page 130: ...rocedures 1 Identify the line input assembly on the instrument rear panel See Figure 8 2 2 Turn the line power switch OFF O 3 Remove the instrument power cord 4 With a small screwdriver release the dr...

Page 131: ...n electrostatic field The low energy source that most commonly destroys Electrostatic Discharge Sensitive ESDS devices is the human body which generates and retains static electricity Simply walking a...

Page 132: ...d for storage of ESD material 6 Do not handle ESDS devices unnecessarily or remove from the packages until actually used or tested 8 7 REAR PANEL CONNECTOR DEFINITIONS The sensor input heater output R...

Page 133: ...DTE DE 9P DTE Pin Description Pin Description Pin Description 1 No Connection 2 TD out 1 DCD in 2 Receive Data RD in 3 RD in 2 RD in 3 Transmit Data TD out 4 RTS out 3 TD out 4 Data Terminal Ready DT...

Page 134: ...1 NC 7 RTS out 7 DTR tied to 4 8 CTS in 8 NC 1 DCD in Model 325 to PC Serial Interface PC with DB 25P Model 325 DE 9P Standard Null Modem Cable DE 9S to DB 25S PC DB 25P 5 GND 7 GND 2 RD in 2 TD out...

Page 135: ...e time Figure 8 7 shows the IEEE 488 interface connector pin location and signal names as viewed from the Model 325 rear panel C 325 8 6 bmp PIN SYMBOL DESCRIPTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15...

Page 136: ...red reattach 19 inch rack mounting brackets 6 Connect power cord to rear of unit and set power switch to On l 8 9 FIRMWARE REPLACEMENT There are two integrated circuits ICs that may potentially requir...

Page 137: ...21 330 Set at factory to reflect configuration of Input B where 321 330 1 mA excitation current on Pin 3 of the connector and 340 Pin 3 connected to shield Refer to Section 3 4 1 JMP5 D R TC Set at fa...

Page 138: ...Lake Shore Model 325 Temperature Controller User s Manual 8 10 Service P 325 8 7 bmp Figure 8 8 Location Of Internal Components...

Page 139: ...ed which provides serial command line communication Example program in Section 6 2 7 is ideal for this purpose DE 9 to DE 9 cable Pin to pin connections on all 9 pins Female connectors on both ends DE...

Page 140: ...del 325 to warm up for at least 1 hour with 100 k resistors attached to all inputs configured as diode resistor and all thermocouple inputs shorted Connect the Model 325 to the PC via the serial port...

Page 141: ...the V terminal from the others and connect to the positive output of the voltage reference Connect the voltage reference negative output to the V I and I terminals 7 Set the voltage reference to provi...

Page 142: ...versal Off CALREAD Reading 000 003 Calibration Command CALZ A 2 0 003 6 From Table 8 2 select the calibration resistor for the range being calibrated and use the DMM in 4 lead resistance measurement m...

Page 143: ...stead precision voltages are supplied to each input and mathematical calibration constants are calculated and programmed into the Model 325 Constants are stored to compensate for both input offset and...

Page 144: ...ulation 25 0032 24 9867 1 00066 Calibration Command CALG A 6 1 00066 10 Send the CALSAVE command to save the constants in the EEPROM 11 Perform calibration on both thermocouple ranges 12 Repeat for se...

Page 145: ...41 Calibration Command CALG V 1 0 99341 9 Send the CALSAVE command to save the constants in the EEPROM 8 12 6 Calibration Specific Interface Commands CALG Gain Calibration Constant Command Input CALG...

Page 146: ...As Diode or Loop 2 Output 7 Thermo 50mV 2 100 Plat 250 Reversal Off 10 100 Plat 250 Reversal On 3 100 Plat 500 Reversal Off 11 100 Plat 500 Reversal On 4 1000 Plat Reversal Off 12 1000 Plat Reversal O...

Page 147: ...Magnetic Flux Density bar Unit of pressure equal to 105 pascal or 0 98697 standard atmosphere baud A unit of signaling speed equal to the number of discrete conditions or signal events per second or...

Page 148: ...the setpoint 1 Dewar flask A vessel having double walls the space between being evacuated to prevent the transfer of heat and the surfaces facing the vacuum being heat reflective used to hold liquid g...

Page 149: ...ned at H 0 and M 0 interchangeability Ability to exchange one sensor or device with another of the same type without a significant change in output or response international system of units SI A unive...

Page 150: ...pole magnetization M This is a material specific property defined as the magnetic moment m per unit volume V M m V Measured in SI units as A m and in cgs units as emu cm3 1 emu cm3 103 A m Since the...

Page 151: ...om the cylinder after reseating pressure has been achieved remanence The remaining magnetic induction in a magnetic material when the material is first saturated and then the applied field is reduced...

Page 152: ...applied field H M H In both SI units and cgs units the volume susceptibility is a dimensionless parameter Multiply the cgs susceptibility by 4 to yield the SI susceptibility See also Initial Suscepti...

Page 153: ...essure Formerly known as Centigrade Originally devised by Anders Celsius 1701 1744 a Swedish astronomer Fahrenheit Abbreviation F A temperature scale that registers the freezing point of water as 32 F...

Page 154: ...48 116 67 243 67 153 15 120 240 151 11 122 04 239 67 150 93 122 22 238 150 123 15 230 145 56 127 59 229 67 145 37 127 78 225 67 143 15 130 220 140 133 15 219 67 139 82 133 33 210 134 44 138 71 209 67...

Page 155: ...cted and isolated the gases will liquefy when properly cooled A quick comparison between LHe and LN2 is provided in Table C 1 Table C 1 Comparison of Liquid Helium and Liquid Nitrogen PROPERTY LIQUID...

Page 156: ...ry 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...

Page 157: ...5 0 190 0 180 0 0 09062 0 10191 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...

Page 158: ...31070 1 32727 1 34506 1 36423 1 38361 1 40454 1 42732 1 45206 1 48578 1 53523 1 56684 1 58358 1 59690 1 60756 1 62125 1 62945 1 63516 1 63943 1 64261 1 64430 20 2 17 10 15 90 14 90 14 00 13 15 12 35 1...

Page 159: ...5 0 715 0 760 0 800 0 3 820 4 235 5 146 5 650 6 170 6 726 7 909 9 924 12 180 15 015 19 223 23 525 32 081 46 648 62 980 75 044 98 784 116 270 131 616 148 652 165 466 182 035 198 386 216 256 232 106 247...

Page 160: ...7 68 69 70 3 05186 3 05322 3 05466 3 05618 3 05780 3 05952 3 06135 3 06330 3 06537 3 06760 3 06968 3 07190 3 07428 3 07685 3 07922 3 08175 3 08447 3 08786 3 09150 3 09485 3 09791 3 10191 3 10638 3 110...

Page 161: ...56 57 58 59 60 61 62 63 64 65 66 3 40482 3 40688 3 40905 3 41134 3 41377 3 41606 3 41848 3 42105 3 42380 3 42637 3 42910 3 43202 3 43515 3 43853 3 44230 3 44593 3 44984 3 45355 3 45734 3 46180 3 46632...

Page 162: ...100 102 5 105 107 5 110 5 113 5 116 5 119 5 122 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 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109...

Page 163: ...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...

Page 164: ...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...

Page 165: ...60639 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...

Page 166: ...80 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...

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