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Lake Shore Model 325 Temperature Controller User’s Manual

Operation

4-9

4.4.4.1

Room-Temperature Compensation

Room-temperature compensation is required to give accurate temperature measurements with thermocouple sensors.
It corrects for the temperature difference between the instrument thermal block and the curve normalization temperature
of 0 °C. An external ice bath is the most accurate form of compensation, but is often inconvenient. The Model 325 has
built-in room-temperature compensation that is adequate for most applications. The built-in compensation can be turned
on or off by the user. It operates with any thermocouple type that has an appropriate temperature response curve loaded.
Room-temperature compensation is not meaningful for sensor units measurements.

NOTE:

Room temperature compensation should be calibrated as part of every installation.

To turn room temperature compensation on or off, press the

Input Setup

and press

Enter

until the following display

appears.

Select for InputA °®
Room Comp On

Use the

s

or

t

key to turn room-temperature compensation on or off, then press the

Enter

key. The default setting is

On. If curve is set to “None” the room-temperature compensation selection is automatically turned off.

4.4.4.2

Room-Temperature Calibration Procedure

Room-temperature calibration is used to calibrate the built-in compensation and is recommended when a thermocouple is
first installed or any time a thermocouple is changed.

Factory calibration of the instrument is accurate to within approximately ±1 K. Differences in thermocouple wire and
installation technique create errors greater than the instrument errors.

Therefore, the best accuracy is achieved by calibrating with the thermocouple actually being used 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 Model 325 is configured as dual thermocouple unit,
calibrate both inputs even if they use the same type of thermocouple. An appropriate curve must be selected and room
temperature compensation must be turned on before calibration can be started.

There are three options for room temperature calibration:

• Cleared

. The previous room-temperature calibration value is cleared and no adjustment will be made to the

temperature value provided by the internal temperature sensor when compensation is on.

• No

. Use the room-temperature calibration value determined the last time the room-temperature calibration procedure

was performed.

• Yes

. Perform the room-temperature calibration procedure that follows.

Calibration Procedure

1. Attach a thermocouple sensor or direct short across the input terminals of the thermocouple input. See Figure 3-4 for

polarity.

2. Place the instrument away from drafts. If calibrating using a short, place an accurate room-temperature thermometer

near the terminal block.

3. Allow the instrument to warm up for at least ½ hour without moving or handling the sensor.

4. If calibrating with a short skip to step 6, otherwise insert the thermocouple into the ice-bath, liquid nitrogen, helium

Dewar, or other know fixed temperature. The temperature should be close to the measurement temperature that
requires best accuracy.

5. Read the displayed temperature. If the temperature display is not as expected, check to be sure that the thermocouple

is making good thermal contact. If possible, add a thermal mass to the end of the thermocouple.

6. Press the

Input Setup

key and press the Enter key until the “Room Cal” screen appears. Press the

s

or

t

key until

the “Yes” selection appears then press the

Enter

key.

Select for InputA °®
Room Cal Yes

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Содержание 325

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 6: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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