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Fluke Hart Scientific 1575 Super-Thermometer, User Manual

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9

Calibration

This chapter explains the step-by-step procedure for calibrating and verifying
the 1575/1590 Thermometer to ensure that the instrument meets its published
specifications. The calibration should be performed at least once per year. In
line with normal prudent metrology practices, Hart recommends a short-cycle
calibration interval of six months for new units during the first year to ensure
that all components are as stable as expected.

9.1

Setup

The following standard resistors are recommended for calibrating and verifying
the resistance accuracy of the thermometer:

The 1575/1590 must be turned on and allowed to warm up for at least one hour
before proceeding with the calibration. The resistor oven should also be on and
warmed up for at least one hour. (See Section 7.6.5.2 to operate the resistor
oven.)

109

9 Calibration

Setup

Standard Resistor

Uncertainty

1

Ω

10 ppm

10

Ω

5 ppm

100

Ω

1.5 ppm

10 k

Ω

2.5 ppm

Table 15

Standard Resistors Used for

Calibration of the Reference Resistors

Standard Resistors

Ratio Uncertainty

25

Ω/

100

Ω

0.25 ppm

100

Ω

/100

Ω

0.25 ppm

400

Ω

/100

Ω

0.25 ppm

Table 16

Standard Resistors Used for

Calibration of the Ratio Measurement

Summary of Contents for Hart Scientific 1575 Super-Thermometer

Page 1: ...1575 1590 Thermometer Readout User s Guide Rev 5B2802 Hart Scientific ...

Page 2: ...ientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com www hartscientific com Subject to change without notice Copyright 2005 Printed in USA ...

Page 3: ...akage 9 2 2 2 5 Self heating 9 2 2 2 6 Component Drift 9 2 2 2 7 Noise and Resolution 9 2 2 2 8 Nonlinearity 10 2 2 2 9 Measurement Speed 10 2 2 2 10 Solid State Design 11 3 Specifications and Environmental Conditions 13 3 1 Specifications 13 3 2 Environmental Conditions 15 3 3 Warranty 15 4 Quick Start 17 4 1 Unpacking 17 4 2 Learn About the Features and Components 17 4 3 2575 2590 Scanner Setup ...

Page 4: ...emory 45 7 3 5 Run Pause Sampling 45 7 4 Probe Menu 45 7 4 1 Select Channel 46 7 4 2 Select Probe 46 7 4 3 Edit Probe 46 7 4 3 1 Serial Number 47 7 4 3 2 Temperature Conversion 47 7 4 3 2 1 ITS 90 47 7 4 3 2 2 IPTS 68 48 7 4 3 2 3 Callendar Van Dusen 48 7 4 3 2 4 Polynomial 49 7 4 3 2 5 Thermistor 49 7 4 3 2 6 Resistance 49 7 4 3 2 7 W T90 49 7 4 3 2 8 Ratio 50 7 4 3 3 Reference 50 7 4 3 4 Current...

Page 5: ...arameters 84 7 6 2 3 Load Parameters 85 7 6 2 4 Reset Parameters 85 7 6 2 5 Screen Parameters 85 7 6 3 Disk Menu 85 7 6 3 1 Setup 86 7 6 3 2 Record Stop 87 7 6 3 3 Record N 87 7 6 3 4 Format Disk 87 7 6 3 5 Run Application 87 7 6 4 Communications Menu 88 7 6 4 1 Serial 88 7 6 4 2 IEEE 488 89 7 6 4 3 Printer 90 7 6 4 4 Analog Output 91 7 6 4 4 1 Parameter 92 7 6 4 4 2 Resolution 92 7 6 4 4 3 Offset...

Page 6: ...tput 114 10 3 1 2 Control Cable 114 10 3 1 3 Resistance Inputs 115 10 3 2 Setup 116 10 4 Parts and Controls 116 10 5 Scanner Operation 119 10 5 1 Soft key Menus 119 10 5 2 Channel Menu 119 10 5 2 1 Scanner Channel 120 10 5 2 2 Scanner Sequence 120 10 5 3 Probe Menu 122 10 5 3 1 Select Channel 122 10 5 4 Digital Interface Commands 123 11 2590 Scanner optional 125 11 1 Introduction 125 11 2 Specific...

Page 7: ...2 2 Standby Current 133 11 5 3 Digital Interface Commands 133 12 Maintenance 135 13 Troubleshooting 137 13 1 Troubleshooting 137 13 2 CE Comments 1590 Only 140 13 2 1 EMC Directive 140 13 2 1 1 Immunity Testing 141 13 2 1 2 Emission Testing 141 13 2 2 Low Voltage Directive Safety 141 v ...

Page 8: ...9 Example Calibration Table Page 73 Figure 10 Data Type Display 75 Figure 11 Graph Type Display 76 Figure 12 Example of Data Recorded to Disk or Output Via the Digital Interface 86 Figure 13 Serial Cable Wiring 99 Figure 14 Scanner Output Connection 114 Figure 15 1575 to 2575 Control Cable Connection 115 Figure 16 Probe Input Connection 116 Figure 17 2575 Scanner Front Panel 117 Figure 18 Menu Tre...

Page 9: ... Table 8 Automatic Sequencing Calibration Setup 57 Table 9 SPRT Resistance Comparison Calibration Setup 58 Table 10 Units of Measure 83 Table 11 Interface Commands 105 Table 12 Interface Commands continued 106 Table 13 Interface Commands continued 107 Table 14 Interface Commands continued 108 Table 15 Standard Resistors Used for Calibration of the Reference Resistors 109 Table 16 Standard Resistor...

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Page 11: ...ing of each symbol Symbol Description AC Alternating Current AC DC Battery Complies with European Union Directives DC Direct Current Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On 1 1 Before You Start Symbols Used Table1 International Electrical Symbols ...

Page 12: ...d actions that may damage the in strument being used 1 2 1 WARNINGS DO NOT use this unit in environments other than those listed in the User s Guide Follow all safety guidelines listed in the User s Guide Calibration equipment should only be used by trained personnel This instrument can measure extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes ma...

Page 13: ...rheating and absorption of moisture or fluids in the wires or hub Damage may not be visibly apparent but nevertheless can cause drift in stability and loss of accuracy Observe the following precautions DO NOT allow probes to be dropped struck bent or stressed DO NOT overheat probes beyond their recommended temperature range DO NOT allow any part of the probe other than the sheath to be im mersed i...

Page 14: ... 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage...

Page 15: ...n LCD graphics display that shows in a clear and easy to read manner a variety of information such as present and past measure ments statistical results and instrument settings Measurements can be viewed in numeric and graphic plot form The display is easily configured by the user for various applications Contrast brightness and colors 1590 only can be ad justed Even the tilt of the display on the...

Page 16: ... with the amplifier and ADC Since only one of the voltages can be mea sured at a time the relay must be used to switch between them The voltage on each resistor is measured twice once with the current in one di rection and again with the current in the opposite direction Subtracting the two voltage measurements eliminates offset voltages including those arising from thermoelectric EMF since they a...

Page 17: ... 1990 ITS 90 by applying coefficients unique to the SPRT or PRT The 1575 1590 does these calculations automati cally The sensor coefficients are entered into the 1575 1590 by the user and stored in non volatile memory Temperature is calculated in any of a variety of units including degrees Celsius C degrees Fahrenheit F or Kelvin K Once the temperature reading is obtained it is sent to the display...

Page 18: ... poten tials called thermoelectric EMFs Unless rejected in some way the thermoelec tric EMFs can interfere with the sensor EMF and degrade the accuracy of the measurement There are three different techniques that can be used to cancel thermoelectric EMF Some resistance bridges apply AC driving current and use sensing circuits that detect only the AC signal rejecting the DC EMFs This technique is v...

Page 19: ...her than it should be The 1575 1590 is able to achieve full accuracy with small currents that minimize self heating 1 mA for PRTs and 10 μA for thermistors The current can be set within a wide range and with excellent resolution Being able to set the current to precise ar bitrary values allows self heating errors to be controlled measured and canceled 2 2 2 6 Component Drift The accuracy of a typi...

Page 20: ...alance between resolution and response 2 2 2 8 Nonlinearity Having taken care of all the other sources of error explained above all that s left is nonlinearity Consider nonlinearity to be curvature in the graph of the re lationship between the actual resistance ratio and the resistance ratio measured by the 1575 1590 It is a result of imperfections in the analog to digital con verter and also to a...

Page 21: ...h as tracking fast changing temperatures measuring temperature differences or evaluating thermal response times 2 2 2 10 Solid State Design Unlike a bridge that requires a large heavy precision ratio transformer and doz ens of relays the 1575 1590 uses semiconductor circuits and only a few relays to switch between resistors This gives it better reliability smaller size lighter weight and lower cos...

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Page 23: ...100 ppm 40 ppm 2 5 to 40Ω input 10Ω refr 3 mA 40 ppm 20 ppm 0 to 25Ω input 100Ω refr 1 mA 0 0002Ω 0 00015Ω 25 to 400Ω input 100Ω refr 1 mA 8 ppm 6 ppm 400 to 1000Ω input 100Ω refr 0 1 mA 25 ppm 10 ppm 0 to 2 5 kΩ input 10 kΩ refr 0 01 mA 0 05Ω 0 025Ω 2 5 to 40 kΩ input 10 kΩ refr 0 01 mA 20 ppm 10 ppm 40 to 100 kΩ input 10 kΩ refr 0 005 mA 60 ppm 30 ppm 100 to 500 kΩ input 10 kΩ refr 0 002 mA 200 ...

Page 24: ... 11 Pollution Degree 2 per IEC1010 1 Size 516 mm x 320 mm x 178 mm 20 3 W x 12 6 D x 7 0 H Weight 16 kg 35 lb Notes Specifications stated in ppm are relative to the reading Accuracy specifications are applicable for a one year calibration interval In line with normal prudent metrology practices Hart recommends a short cycle calibration interval of six months for new units during the first year to ...

Page 25: ...misuse alteration abuse or abnormal conditions of operation or handling Software is warranted to operate in accordance with its programmed instruc tions on appropriate Hart products It is not warranted to be error free Hart s obligation under this warranty is limited to repair or replacement of a product which is returned to Hart within the warranty period and is determined upon examination by Har...

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Page 27: ...tion 5 4 3 2575 2590 Scanner Setup If a 2575 or 2590 scanner was purchased refer to Section 10 2575 Scanner or Section 11 2590 Scanner concerning specifics to each scanner 4 4 Power Source The 1575 1590 is normally configured to use 100 125 VAC 50 60Hz It may optionally be switched to use 200 250 VAC 50 60Hz The switch on the back of the instrument is used for switching the voltage Make sure the v...

Page 28: ...ng initialization the display re mains dark 4 7 Measure Temperature To make temperature measurements using your probe you must set up the following 1 Select the channel to which your probe is connected To do this enter the CHANNEL MENU and press the INPUT 1 soft key if the probe is connected to Input 1 or press the INPUT 2 soft key if it is connected to the Input 2 Section 7 1 If you are using the...

Page 29: ...alibration report or specifications for your probe When finished exit out to the main menu using the RETURN soft key or Exit 6 Begin sampling If the 1575 1590 is not now sampling press the RUN soft key in the SAMPLE MENU to begin sampling Section 7 2 1 The 1575 1590 should now be able to measure temperature accurately If de sired you can modify the filter settings in the SAMPLE MENU to minimize no...

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Page 31: ... 5 4 Patented DWF Connector Posts The input patented DWF connector posts are located on the right side of the front panel Thermometer probes can be connected to the patented DWF con nectors with spade lugs banana plugs or bare wires There are two channel in puts These are labeled Input 1 and Input 2 on the front panel Input 1 is usually used when measuring with only one resistance thermometer Inpu...

Page 32: ...panel It is illumi nated when power is on Rack Mounting Screws The 1575 1590 can be removed from the outer cabinet for installation into a rack system It is removed by first removing the four front panel screws and the four back panel screws It may be easier to take out if the top of the box is removed 5 2 Back Panel The following are found on the back of the 1575 1590 Power Cord The power supply ...

Page 33: ...or The 1575 1590 can be connected to an IEEE 488 bus GPIB through this con nector on the back panel The IEEE 488 bus can be used to read measurements and control the operation of the instrument Analog Output The two binding posts on the back panel are used for the analog output This provides a DC potential between 5V and 5V that indicates the value of measurements Scanner Connector The 15 pin conn...

Page 34: ... used to show measurements status information operating parameters and soft key functions The types of data shown on the screen are described below Measurement Window The most recent measurement is shown in large digits in the box at the top of the screen Out of range measurements are displayed as The unit of measurement is shown to the right of the measurement C for Cel sius F for Fahrenheit K fo...

Page 35: ... measurements graphically Oven Indicator This indicator shows whether the oven is on or off If it was recently turned on the time remaining until the oven is warmed up and stabilized is shown The oven regulates the temperature of the internal reference resistors to minimize drift see Section 7 6 5 2 Date and Time The date is shown at the bottom of the screen in the order of month day and year The ...

Page 36: ...r If the cursor is at the bottom of the list pressing Enter without changing the parameter will exit the window The Enter button may also be used during some operations to affirm or continue with an action or choice NOTE The Enter button must always be pressed after changing a param eter to accept the new value or option Del When entering or editing a numeric parameter the Del delete key is used t...

Page 37: ... dis played in a window U and D can be used to scroll the list The left and right arrow keys have two functions When entering or editing a numeric parameter these can be used to move from digit to digit When setting some parameters these are used to change the option Remember you must al ways press Enter to save a new value or option These are the display contrast adjustment buttons They can be us...

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Page 39: ...3 4 This makes the 1575 1590 an excellent readout for thermistor temperature sensors The superb accuracy and reso lution of the 1575 1590 along with the extra sensitivity of thermistors gives you the capability of measuring temperature with remarkable reso lution and accuracy The 1575 1590 will accept Steinhart Hart thermistor characterization coefficients for direct readout of temperature see Sec...

Page 40: ...s of measurements taken over a long period of time You can use this to observe long term fluctuations of temperature The data can be downloaded to a computer for analysis graphing and print ing Recording temperature with a strip chart recorder The 1575 1590 an alog output allows you to connect the 1575 1590 to a strip chart recorder and graph measurements directly on paper see Section 7 6 4 4 You ...

Page 41: ...a fields so that they can be readily checked see Section 7 5 3 3 Set the digital filter correctly The digital filter helps to improve resolu tion and accuracy If it not set up properly the filter can be ineffective A common mistake is to set the filter threshold too low This can cause the filter to reset too often allowing excessive noise to pass through see Sec tion 7 2 4 The message FILTER RESET...

Page 42: ... 2 2 Evaluating Temperature Uncertainty The 1575 1590 Thermometer Readout is often used for calibrating PRTs and in other applications where precision temperature measurements are critical It is important to know how much uncertainty the 1575 1590 contributes to total system uncertainty The specification section of this manual Section 3 1 pro vides typical temperature uncertainty figures for some ...

Page 43: ... the uncertainty of temperature measurements using the 1575 1590 The specification section of this manual provides typical temperature uncer tainty figures for some particular conditions The actual uncertainty of your measurements may vary depending on the resistance of your sensor Uncer tainty also depends significantly on the quality of the SPRT or sensor and its calibration Section 6 2 2 provid...

Page 44: ...th the 1590 this problem can be avoided since the 2590 incorporates an independent standby current source for each channel Can the 1575 1590 calculate ITS 90 coefficients Yes The ITS 90 calibration feature allows you either measure resistance data or enter previously obtained values to calculate ITS 90 coefficients see Section 7 4 4 2 8 Can the 1575 1590 generate Callendar Van Dusen IPTS 68 or the...

Page 45: ... the 1575 The inputs of the 1575 1590 can be connected to third party scanners but the 1575 1590 will not be able to control the scanner directly You would have to select channels manually or use a computer to con trol the scanner What has been done to verify and validate the accuracy of the 1575 1590 and its internal software Hart Scientific makes every effort to ensure that your 1575 1590 Super ...

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Page 47: ...The CHANNEL menu contains functions that control the input channels You can select either channel or you can have the Super Thermometer alternate be tween them Within the channel menu there are three soft keys INPUT 1 IN PUT 2 and ALT N If the 2575 or 2590 Scanner is connected to the thermometer two additional soft key functions SCANNER and SCANNER SEQ appear in this menu refer to the 2575 and 259...

Page 48: ...07 CAL ITS 90 Calibrate probe ITS 90 coefficients CONV TEST Test probe characterization coefficients SYSTEM MENU UNITS TIME DISK MENU COMMUNICATIONS MENU Select units C K F ohms ratio W Set date and time Start or stop data logging to disk Record a number of measurements to disk Setup disk sampling parameters Run application program on disk Set serial setup and sampling parameters Set parallel inte...

Page 49: ...e taken with Input 2 and the sequence repeats The alternate mode works with either of the sampling modes described below in Section 5 2 If continuous sampling is selected the channels will alternate indefinitely while measurements are made If SAMPLE N is selected the chan nels will be switched alternately until the total number of measurements reaches the number specified with SAMPLE N 7 2 Sample ...

Page 50: ...graying RUN while the samples are being taken and STOP when fin ished Channels may be switching manually or automatically without affecting the total number of measurements made 7 2 3 Sample Timing The SAMPLE TIMING soft key allows the user to set any of the sample timing parameters which include conversion time sample interval and integration pe riod Access to the sample timing parameters can be ...

Page 51: ...ment once every hour If you want the measurement to be the average of only the last one minute you would set the integration time to 60 seconds If you want the measurement to be the average of all raw samples during the hour you would set the integration period to 3600 seconds The range of the integration period is 2 to 32000 but must be between the conversion time and sample interval inclusive 7 ...

Page 52: ...et to the smallest value that achieves the desired resolution and accuracy To help allow the filter to track changing temperatures while still removing noise the digital filter has an automatic reset feature The filter will reset if the difference between the raw measurement and the previous filtered measurement exceeds a specified reset threshold This limits the amount of error the filter can cau...

Page 53: ...nually at any time by pressing the DIGI TAL FILTER soft key and then pressing Exit The filter resets whenever the fil ter window is exited The filter will also be reset if the system units are changed unless the units are only changed from one type of temperature units to another e g C to F 7 2 5 Reset Statistics Pressing the RESET STATS soft key causes the statistical registers to be cleared Any ...

Page 54: ...mory along with its units 7 3 2 Write Value With WRITE VALUE you can enter any number into any memory location This may be useful if you want to display the differences between measure ments and a particular value see Section 7 5 3 When you press this key a small window appears that allows you to enter the memory location you want the value and the units The value will stay in memory until you ove...

Page 55: ...stored in memory as explained in Section 7 3 1 Measuring will re sume when the key is pressed again or the memory menu is exited The word RUN or PAUSE is grayed out to indicate the current status 7 4 Probe Menu The PROBE menu includes functions for specifying probe characterization co efficients and measuring parameters It also includes functions for calibrating PRTs according to ITS 90 Access to ...

Page 56: ...hen you press this soft key a list of probe defi nitions appears with the serial numbers of the probes Use the U and D but tons to move to the desired probe number and press Enter The probe window will be updated to show the parameters for the selected probe One restriction is you can not select a probe for INPUT 2 that has EXTERNAL selected as the reference 7 4 3 Edit Probe The EDIT PROBE soft ke...

Page 57: ... conversion type and the System Units settings Ratio or ohms set tings will override temperature units 7 4 3 2 1 ITS 90 Most PRTs and SPRTs are characterized according to the International Temper ature Scale of 1990 ITS 90 If you select ITS 90 for CONVERSION you must then select one or two sub ranges then enter the coefficients for the sub ranges You may select both a low temperature sub range and...

Page 58: ...ternational Practical Tem perature Scale of 1968 IPTS 68 probes are often only calibrated over a limited temperature range and some of the coefficients may not be available e g a3 b3 Enter 0 0 for unused coefficients You can select the ITS 90 scale conver sion by setting the SCALE parameter to T90 This causes the temperature to be adjusted by an amount equal to the difference between the IPTS 68 a...

Page 59: ...THRM T R If the coefficients are for resistance as a function of tem perature equation select THRM R T If there is no coefficient for the second order term set A2 or B2 to 0 T R K A A InR A InR A InR 0 1 2 2 3 3 1 R T K B B T B T B T exp 0 1 1 2 2 3 3 7 4 3 2 6 Resistance The R Ω option causes the measurement to be displayed as a resistance in ohms rather than temperature The resistance is display...

Page 60: ...m external reference resistor is recommended TIP Program the data window to show the reference resistor so you can easily see that it s set correctly see Section 7 5 3 If you use an external standard resistor as the reference be sure you have en tered its correct resistance with the SET EXT function in the SYSTEM REF ERENCE menu see Section 7 6 5 1 An external reference resistor must be connected ...

Page 61: ... tem perature using two wire or three wire RTDs It adjusts the measured resistance to compensate for lead resistance This is not necessary with four wire probes since the lead resistance is canceled automatically CAUTION When using four wire probes the 3W OFFSET value must be set to zero or the measurement may not be accurate When using three wire or two wire probes the 1575 1590 is unable to dire...

Page 62: ...very important when calibrating the probe It is recommended that you use filtering with a time constant of 20 to 60 sec onds Be sure the filter threshold is high enough To begin the calibration place the probe in the triple point of water cell and al low the temperature to equilibrate Press the CAL TPW soft key A window ap pears asking for the immersion depth in millimeters of the probe in the tri...

Page 63: ...r When STOP is pressed the final value of the measurement will be shown Press the STORE soft key or Enter to save the new value The measured re sistance will replace the previous value for the water triple point resistance R TPW for the given probe 53 7 Front Panel Operation Probe Menu ...

Page 64: ...for comparison calibrations For details on the fixed points and the ITS 90 in general refer to NIST Technical Note 1265 Guidelines for Realizing the International Temperature Scale of 1990 Subrange Number Temperature Range Fixed Points Comparison Temperature Range Low Range 4 83 8058 to 273 16K Argon Ar 83 8058K Mercury Hg 234 3156K Water TPW 273 16K 65 to 210K 225 to 250K 263 to 283K 5 234 3156 t...

Page 65: ...he resistance and temperature measurements you may examine the data using the DATA soft key 4 The ITS 90 coefficients are calculated from the resistance temperature data using the CALCULATE soft key 5 A report is generated for the probe using the PRINT REPORT soft key The report shows the new ITS 90 coefficients along with applicable data The report may optionally include a table of resistances fo...

Page 66: ...e setup parameters for the comparison calibration method are shown in Table 7 Options not indicated are irrelevant In the table PROBE 2 is shown set up as the reference SPRT on INPUT 2 as an example A different probe and chan nel may be used instead For best accuracy the temperature measurement should be repeated between each probe s resistance measurement TEMP set to REPEAT 7 4 4 2 3 Comparison C...

Page 67: ...lculated by multiplying the measured ratio by the previously measured SPRT resistance If the bath is drifting the resistances of the probe and SPRT will change in the same proportion so the ratio and thus the mea sured resistance will remain constant Likewise any error in measuring the bath temperature has little effect on the results since the recorded SPRT resis tance will reflect the same error...

Page 68: ...nd again at the triple point of water W is calculated by di viding the fixed point resistance by the triple point of water resistance W T R T R TPW The self heating can be determined while measuring resistance by in creasing the current by a factor of 1 414 and noting the increase in the measurement see Section 7 4 4 3 Subtract the difference from the mea sured value with normal current to obtain ...

Page 69: ...opriately in the SAMPLE MENU To remind you that the probe parameters must be set before beginning the calibra tion a message appears when you begin SETUP Press the NEXT soft key also Enter or Exit to continue The setup parameters are grouped in four screens The first screen sets up the temperature reference You must specify the type of reference If only fixed points will be used select FIXED POINT...

Page 70: ...ed in the first screen and its channel was set to INPUT 2 You specify whether to use the normal ref erence resistor determined by REFERENCE in EDIT PROBE or the SPRT connected to Input 2 when measuring the resistances of the calibration probes Select NORM if the resistances are to be measured in ratio to the normal refer ence resistor e g 100 internal resistor Select SPRT if you desire to measure ...

Page 71: ...d in the setup the next screen will prompt to begin the temperature measurement Press the START soft key or Enter to be gin measuring with the SPRT or press FIXED POINT if a fixed point is to be used or the temperature is already known This screen will not appear if the TIMED mode was selected in the setup 61 7 Front Panel Operation Probe Menu ...

Page 72: ...gth of time has elapsed If the thermometer detects that the noise of the measurements exceeds the filter threshold a warning message will appear To fix this return go into the FIL TER parameter window in the SAMPLING MENU and increase the filter threshold value Start over with the calibration When STOP is pressed the final value of the measurement will be shown Press the STORE soft key or Enter to...

Page 73: ...nce measurement If you want to use a fixed point cell for the calibration point press FIXED POINT instead of START You will be requested to store the fixed temperature value You may change the temperature if necessary using the numeric keys and Enter Press the STORE soft key or Enter to accept the value 63 7 Front Panel Operation Probe Menu ...

Page 74: ...erly Press the START soft key or Enter to begin the measurement This screen will not appear if the TIMED mode was selected in the setup The thermometer will begin measuring the resistance of the probe If the RREF mode was set to SPRT the resistance will be obtained by measuring the ratio of the probe resistance to the SPRT on INPUT 2 and multiplying by the SPRT re sistance measured in the temperat...

Page 75: ...t to be recorded automatically When STOP is pressed the final value of the measurement will be shown Press the STORE soft key or Enter to save the value The measurement will be stored with the calibration data as the resistance value of the given probe 65 7 Front Panel Operation Probe Menu ...

Page 76: ... The DATA soft key can be used to examine the calibration data obtained in the measurement step You may also enter resistance temperature data obtained previously and use it to calculate coefficients When you press this soft key a window appears showing the data for the first probe You may select any of the calibration probes using the LR buttons Use the UD buttons to scroll down through the list ...

Page 77: ...ontinue Press RETURN or Exit to cancel and return to the menu Next a window will show the first probe in the set and ask if you want to pro ceed with calculating the coefficients You can select any probe in the set using the LR buttons Only those probes assigned a channel in the setup can be selected Press the CALCULATE soft key or Enter to continue with the calcu lation If the calculations are su...

Page 78: ... output port for the report You may use the LR buttons to select the probe Only the probes assigned channels in SETUP can be selected Press Enter after changing the probe number For the output port you may select among the printer parallel port serial port IEEE 488 port or disk Printing to disk may be useful if you want to customize the report using a word processor When printing to disk the filen...

Page 79: ...he CONV TEST soft key can be used to test the accuracy of the resis tance to temperature conversion calculations and probe characterization coeffi cients It allows you to enter a resistance value and then it will display the corresponding temperature values in C K and if ITS 90 or IPTS 68 is used W values You can compare the resistance and temperature to values given in a calibration report table ...

Page 80: ... confirm to replace the current param eters with those in the file You may set a different probe with the parameters in the file by changing the probe number using the buttons Press Enter to pro ceed or Exit to abort CAUTION Using the READ PROBE or READ ALL functions will over write current probe parameters 7 4 5 3 Save All You can use the SAVE ALL soft key to save the parameters for all of the pr...

Page 81: ...sity or 1 44 Mb high density format Generally disks of one type cannot be formatted to the opposite density When you begin the format operation you must specify the density by using the LR buttons and pressing Enter The 1575 1590 will try to format the disk at the density you select If the disk cannot be formatted at this density a message will appear to tell you so If this happens select the othe...

Page 82: ...hermometer Serial Number 2 20 March 1995 Current 1 0 mA Temperature K W T90 83 8071 0 21586101 234 3141 0 84415349 273 16 1 00000000 505 0759 1 89270529 692 6744 2 56876956 Coefficients a4 1 26508267E 04 b4 8 61659096E 05 a8 1 03200171E 04 b8 9 448039801E 06 Resistance at 273 16 K 25 57249 ohms Figure 8 Example Calibration Report ...

Page 83: ...9 0 0 30399751 119 0 0 51590002 168 0 0 30830574 118 0 0 51991744 167 0 0 31261096 117 0 0 52408265 166 0 0 31691315 116 0 0 52824567 165 0 0 32121225 115 0 0 53240653 164 0 0 32550826 114 0 0 53656525 163 0 0 32980114 113 0 0 54072184 162 0 0 33409087 112 0 0 54487634 161 0 0 33837745 111 0 0 54902876 160 0 0 34266087 110 0 0 55317913 159 0 0 34694113 109 0 0 55732746 158 0 0 35121822 108 0 0 561...

Page 84: ...emory The display menu includes the soft keys DATA GRAPH SELECT DISPLAY EDIT DISPLAY DISPLAY RESOL and CLEAR GRAPH graph display only 7 5 1 Data Graph The DATA GRAPH soft key allows you to select between two types of dis plays data type and graph type The data type display shows five lines of nu 1575 1590 Thermometer Readout User s Guide 74 ...

Page 85: ... information such as a statistical calculation or probe parameter The graph type display shows a plot of past measurements see Figure 11 You can set the upper and lower bounds of the graph The time scale of the graph is 75 7 Front Panel Operation Display Menu Figure 10 Data Type Display ...

Page 86: ...determined by the sample interval set with the SAMPLE TIMING soft key in the SAMPLE MENU 1575 1590 Thermometer Readout User s Guide 76 Figure 11 Graph Type Display ...

Page 87: ...he type of data shown for the data display or the scale limits for the graph display You select the display using the LR buttons After you press Enter the display will change to the configura tion you selected 7 5 3 Edit Display Data Press the EDIT DISPLAY soft key to edit a display configuration For the data type display you can program the five data fields to show any of a variety of 77 7 Front ...

Page 88: ...d Press Enter to change the parameter for the field A new window will appear showing the available parameters Move the cursor to the parameter you want The window will scroll if you move past the top or bottom of the screen 1575 1590 Thermometer Readout User s Guide 78 ...

Page 89: ... refer back to Section 7 3 1 When you select this option you will be prompted to enter a memory number There are 100 memory locations If there is a conflict be tween the units of the T value and the MEMORY value will be displayed 4 T HISTORY This option displays the difference between the present measurement and a pre vious measurement in the history buffer This can be used to calculate the rate a...

Page 90: ...easure temperature stability or noise in the measurement system 12 T C This displays the most recent temperature measurement in degrees Celsius 13 T K This displays the most recent temperature measurement in Kelvin 14 T F This displays the most recent temperature measurement in degrees Fahrenheit 15 T This displays the resistance of the most recent measurement in ohms 16 T r This displays the most...

Page 91: ...ample interval specified with the SAMPLE TIMING soft key in the SAMPLE MENU The scale of the horizontal axis is the length of time required to make 216 measurements This function also allows you to select the graph style between POINTS or LINES POINTS causes temperature measurements to be represented as sepa rate points on the display LINES causes lines to be drawn that connect the measurement poi...

Page 92: ...esolution 7 5 6 Clear Graph The CLEAR GRAPH soft key is only available when the graph type display is selected It clears all of the past data from the graph If the limits are set to AUTO the graph will automatically rescale to the new measurements 1575 1590 Thermometer Readout User s Guide 82 ...

Page 93: ...its with which measurements are displayed saved to disk and transmitted over the communications channels You can choose any the units shown in Table 10 Access to the UNIT function can be locked out as explained in Section 7 6 5 4 83 7 Front Panel Operation System Menu Units Description C Temperature in degrees Celsius F Temperature in degrees Fahrenheit K Temperature in degrees Kelvin Ω Resistance...

Page 94: ... one of two modes 12 hour mode 12 00 a m to 11 59 p m and 24 hour mode 0 00 to 23 59 If you will be transmitting time stamped measurements to a computer it may be more convenient to use the 24 hour format Press Enter after you make any changes to a parameter NOTE You may need to set the date again after January 1 2000 7 6 2 2 Save Parameters With the SAVE PARAMS soft key you can save all of the op...

Page 95: ...tion only when necessary Access to the RESET PARAMS function may be locked out if any parameters are pro tected as explained in Section 7 6 5 4 7 6 2 5 Screen Parameters The SCREEN PARAMS function lets you set some of the display options which are COLORS 1590 only BRIGHTNESS and SCREEN SAVER COLORS lets you select one of various color schemes BRIGHTNESS lets you adjust the brightness of the displa...

Page 96: ...rements You may set it to a specific value or you can set it to AUTO If you set the period to AUTO each new measurement will be recorded as soon as it is available The period will be the same as the sample interval set in SAMPLE TIMING see Section 7 2 3 Using AUTO will insure that you record every measurement and will record samples with a more precise interval 1575 1590 Thermometer Readout User s...

Page 97: ...specified number of measurements has been obtained The RECORD N soft key will be highlighted while recording and it will indicate the number of samples remaining The RECORD STOP soft key will indicate RECORD while the samples are being recorded and then STOP when finished Before starting disk sampling make sure the disk sampling parameters are set cor rectly with the SETUP soft key 7 6 3 4 Format ...

Page 98: ...nications see Section 8 Parameters that control the action of the serial interface are set with the SERIAL soft key These include the baud rate sample period duplex mode linefeed and time and date stamp Pressing this soft key brings up a window as shown below BAUDRATE determines the rate at which data is transferred You must set the baud rate of the thermometer to be the same as that of the equipm...

Page 99: ...transmitted at the end of a line of data Data transmitted from the serial port is always followed by a carriage return If you set the linefeed ON a linefeed will also be transmit ted immediately after the carriage return The TIME and DATE parameters determine whether the current time and date are transmitted along with measurements The time can be set to 12 hour or 24 hour time format Section 7 6 ...

Page 100: ... parameters determine whether the current time and date are transmitted along with measurements in response to the tem command see Section 8 3 The time can be set in 12 hour or 24 hour time format Sec tion 7 6 2 1 7 6 4 3 Printer With the printer parallel interface you can connect a printer to the thermome ter and have it record measurements on paper Data sampled to the printer port is formatted t...

Page 101: ...e period is set to OFF measurements will not be printed LINEFEED determines whether a linefeed character will be transmitted at the end of a line of data Data transmitted from the thermometer is always followed by a carriage return If you set linefeed ON a linefeed will also be transmitted immediately after the carriage return The TIME and DATE parameters determine whether the current time and dat...

Page 102: ...is 100 the parameter is T temperature in the current units and the system units are set for C for ev ery 100 C increase in the measurement the analog output will increase 1 volt The smaller the resolution the smaller the range of measurements that can be output 7 6 4 4 3 Offset The OFFSET soft key allows you to set the offset of the analog output The off set is the measurement value in the appropr...

Page 103: ...calibrating VSCALE calibrate Vos accurately To calibrate VSCALE measure the actual voltage at the output using a precision voltmeter when the output is 5 The output will automatically be set to 5 whenever the cursor is on the VSCALE parameter for convenience in calibration Enter the measured volt age for VSCALE HIGH LIMIT sets the maximum voltage that can be output Normally this is set to the maxi...

Page 104: ...nter Example If your reference resistor is 99 99985 ohms enter 99 99985 into the External field 3 Use Probe Menu Select Channel Input 2 to see which probe is assigned to Input 2 Firmware will not allow you to use a probe with an external reference if it is assigned to Input 2 If a probes is assigned to Input 2 and attempted to be used with an external reference the error INPUT 2 CANNOT USE EXTERNA...

Page 105: ... critical to the accuracy of the instrument so this should not be done except by a qualified technician For an explanation of the calibration procedure see Section 9 Access to the CAL REFR function may be locked out as explained in Section 7 6 5 4 7 6 5 4 Security Lock out The SECURITY function in the SYSTEM CAL menu will allow you lock out access to certain parameters menus and functions This pro...

Page 106: ... out by default OFF The SAMPLING lock out controls access to the SAMPLE TIMING and the DIGITAL FILTER functions in the SAMPLING MENU This locks out the sample timing parameters and the digital filter parameters This parameter group is not locked out by default OFF The UNITS TIME lock out controls access to the UNITS and TIME functions in the PARAM MENU This locks out the units time and date settin...

Page 107: ...e the password be sure to make a note of it and keep it in a safe place so it will not be forgotten or lost 7 6 5 5 Information The INFO soft key displays the software version number 97 7 Front Panel Operation System Menu ...

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Page 109: ...h other instruments in a cali bration or control system 8 1 Serial Communications The 1575 1590 Super Thermometer comes with a built in RS 232 serial inter face that allows the operator to use a computer or terminal to remotely read the temperature and also program any of the parameters and settings 8 1 1 Wiring The serial communications cable attaches to the thermometer through the D9 connector a...

Page 110: ...1590 to set the various parameters The interface commands are listed in Section 8 3 below 8 1 3 Serial Communication Example Program Here is a listing of an example program used to read measurements from the 1575 1590 This example runs on a PC compatible computer using GWBasic or QBasic You must set the baud rate of the 1575 1590 to be the same as the computer 1200 in this example SERIAL BAS THIS ...

Page 111: ... parameters The same commands are used with IEEE 488 that are used with se rial communications These are listed in Section 8 3 8 2 2 IEEE 488 Interface Functions Specific IEEE 488 interface features and commands that are implemented with the 1575 1590 are described below The codes that describe the GPIB function ality of the 1575 1590 are SH1 AH1 T6 L4 SR1 RL1 PP1 DC1 DT1 C0 and E2 8 2 2 1 Local L...

Page 112: ... the output buffer 8 2 3 IEEE 488 Communication Example Program Here is a listing of an example program used to control the 1575 1590 and read measurements from it This example program is written for a PC compatible computer using GWBasic with the National Instruments GPIB PC controller The address of the 1575 1590 must be set to the same device address specified in the controller configuration Th...

Page 113: ...ALL IBWRT DEV1 WRT 1070 RD SPACE 80 1080 CALL IBRD DEV1 RD read measurement data 1090 PRINT LEFT RD IBCNT 1 print measurement data 1100 GOTO 1000 loop back 1500 End 1510 CALL IBCLR DEV1 send device clear SDC 1520 CALL IBLOC DEV1 set local mode GTL 1530 END 8 3 Digital Interface Commands The various commands for reading or programming the 1575 1590 parameters via the digital interfaces are listed o...

Page 114: ... IEEE 488 setup screens or by using the appropriate interface commands The new command can be used to determine if a new measurement is avail able since the last one was read The new command returns NEW 1 if a new measurement is available and NEW 0 otherwise This or any other com mand should not be sent at a rate higher than about five per second In the following list of commands characters or dat...

Page 115: ...d or select action of sampling sn sample n sact r san n read or set number of samples in sample n mode san 100 ct ime n read or set conversion time for each sample ct 2 si nterval n read or set sample interval si 10 st ime n read or set integration time for each sample sti 10 fty pe n one a verage s ingle pole w indow e xp read or select filter type the exp setting is for the 1590 only fty s fr es...

Page 116: ...r IPTS 68 scale 16 68 rc vd p n read or set Callendar Van Dusen R 0 constant rcvd 16 100 0 alc vd p n read or set Callendar Van Dusen alpha constant alcvd 16 0 00385 dec vd p n read or set Callendar Van Dusen delta constant decvd 16 1 507 bec vd p n read or set Callendar Van Dusen beta constant becvd 16 0 111 ap oly p i n read or set polynomial coefficients ap 16 0 31 9438576 at herm p i n read or...

Page 117: ...of f read or set printer date transmission enable prid off Analog Output Commands anch annel d efault 1 2 anp arameter n ani ndex n ance nter anr esolution n ano ffset n anvo n read or set analog output channel read or set analog output parameter see Sec 5 6 3 n 0 temperature in current units read or set index for history or memory p arameters center analog output offset read or set analog output ...

Page 118: ...or set time read or set date time 2 43 15pm date 4 9 93 System Commands u nits c k f o hm r atio w read or select temperature units un c v ersion read firmware version ver scrb rightness n read or set screen brightness in percent n 40 100 scrb 85 scrc ontrast n read or set screen contrast in percent n 40 100 scrc 65 scrs aver on of f read or set screen saver on or off scrs on scrt ime n read or se...

Page 119: ...d resistors are recommended for calibrating and verifying the resistance accuracy of the thermometer The 1575 1590 must be turned on and allowed to warm up for at least one hour before proceeding with the calibration The resistor oven should also be on and warmed up for at least one hour See Section 7 6 5 2 to operate the resistor oven 109 9 Calibration Setup Standard Resistor Uncertainty 1Ω 10 pp...

Page 120: ... 2 To properly verify the resistance in step 7 the internal reference resistor for the probe assigned to Input 2 needs to be set to 100Ω To verify the internal reference resistor setting for the probe assigned to Input 2 from the main menu select PROBE MENU EDIT PROBE select the probe number assigned to Input 2 and verify that the internal REFERENCE is set to 100Ω If not set it to 100Ω and then ve...

Page 121: ...o Input 2 using the 100Ω internal reference resistor It should be accurate within the specifications Repeat the procedure for each of the other reference resistors 1Ω 10Ω and 10 kΩ When calibrating the 1Ω 10Ω or 10 kΩ reference resistors replace 100Ω in steps 1 2 4 and 8 with the respective reference resistor value 111 9 Calibration Reference Resistor Calibration ...

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Page 123: ...575 via the communications interfaces Each of the ten inputs has four terminals The terminals are gold plated for low contact resistance and excellent durability The selected channel input is routed to the output by a four pole relay Only one input is connected to the output at any time LED indicators on the front panel show which channel if any is switched on The high quality relays have low cont...

Page 124: ...he scanner must be properly connected to the input of the 1575 The arrangement of the scanner Output terminals corresponds to that of the 1575 Probe 1 input terminals and should be connected accordingly as shown in Figure 14 below 10 3 1 2 Control Cable Before connecting the control cable between the scanner and the 1575 Ther mometer switch the power off to the 1575 The control input of the scanne...

Page 125: ...he four terminal binding posts The top red and bottom black terminals C and C source current to the probe The middle two terminals P and P sense the voltage on the probe Figure 16 below shows how to connect a probe 115 10 2575 Scanner optional Quick Start Figure 15 1575 to 2575 Control Cable Connection ...

Page 126: ...et up the correct reference current conversion algorithm and conver sion coefficients as explained in the Setup section of the 1575 manual Section 10 3 1 3 Other probes may be connected to other channels of the scanner and set up in the same way 3 The 1575 should now be able to measure temperature accurately through the scanner The 1575 can be programmed to automatically switch be tween the channe...

Page 127: ... reference the polarity is ac tually periodically reversed The red and black potential terminals P and P are used to sense the voltage on the probe Guard Connector The guard or shield of the probe cable can be connected to the Guard termi nal If the guard is used the Output guard terminal of the scanner should be connected to the Probe 1 guard terminal of the 1575 All of the guard terminals of the...

Page 128: ...ENU UNITS TIME DISK MENU COMMUNICATIONS MENU Select units C K F ohms ratio W Set date and time Start or stop data logging to disk Record a number of measurements to disk Setup disk sampling parameters Run application program on disk Set serial setup and sampling parameters Set parallel interface sampling parameters Set IEEE 488 setup and sampling parameters SETUP RUN APP SERIAL PRINTER IEEE488 FOR...

Page 129: ... operation of the 1575 Thermometer with the 2575 Scan ner using the front panel buttons and soft keys 10 5 1 Soft key Menus Besides the display brightness and contrast controls all instrument functions are controlled using the soft key menu system This menu system is outlined in the diagram below In each sub menu the RETURN soft key not shown below returns to the next higher menu 10 5 2 Channel Me...

Page 130: ...ng the appropriate channel button on the scanner The light for that channel on the scanner will turn on and the 1575 will begin measuring the channel The 1575 will use the probe parameters set up for that scanner channel see Section 10 5 3 10 5 2 2 Scanner Sequence The SCANNER SEQ soft key can be used to program the 1575 to automati cally measure a sequence of channels A window allows you to selec...

Page 131: ...er of scanner channels or in other words the last scanner channel number in the sequence For the user defined sequence CHANNELS sets the total number of steps in the sequence After the thermometer measures the last channel the sequence repeats starting again at the beginning The NUMBER OF SAMPLES parameter specifies the number of measure ments to make on each channel before advancing to the next T...

Page 132: ...u are unaffected For a description of these functions see Section 7 4 on page 45 10 5 3 1 Select Channel The SELECT CHAN soft key allows you to select the channel for which you want to edit the probe parameters Note that this function does not actually change the channel being measured Each of the two 1575 channels and ten scanner channels are assigned one of the 16 probe parameter sets To change ...

Page 133: ...dard deviation for specified scanner channel scstd 10 ch anmode n read or set sampling channel mode n 1 Input 1 2 Input 2 0 alternate 3 scanner channel 4 scanner sequence ch 5 scc hannel c read or set scanner channel scc 10 scp robe c p read or set probe selection for scanner channel scp 10 16 scmo de n read or set scanner sequence mode n 1 SCAN 2 IN2 SCAN 3 ALT IN2 SCAN 4 ALT SC1 SCAN 5 USER DEFI...

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Page 135: ...d plated for low contact resistance and excellent durability The selected channel input is routed to the output by a four pole relay Only one input is connected to the output at any time LED indicators on the front panel show which channel if any is switched on The high quality relays have low contact resistance low thermal EMF and high isolation resistance The guard on each channel is wired direc...

Page 136: ... connects to the Input 1 terminal with the same designation C1 to C1 P1 to P1 etc To cascade additional scanner connect the output terminals of the second scanner to the corresponding output termi nals of the first scanner Up to five scanners can be chained together in this way 11 3 1 2 Control Cable Before connecting the control cable between the scanner and the 1590 Ther mometer switch the power...

Page 137: ...ogether in this way 11 3 1 3 Resistance Inputs Your SPRT or thermistor probe connects to a channel on the scanner using the four terminal binding posts The top red and bottom black terminals C1 and 127 11 2590 Scanner optional Quick Start Figure 20 2590 To 1590 Control Cable Connection ...

Page 138: ...e channel s in put terminals 2 Set up the correct reference current conversion algorithm and conver sion coefficients as explained in the Setup section of the 1590 manual Other probes may be connected to other channels of the scanner and set up in the same way 3 The 1590 should now be able to measure temperature accurately through the scanner The 1590 can be programmed to automatically switch be t...

Page 139: ... help to reduce the effects of interference in electrically noisy environments Channel Select The ten front panel buttons allow you to select the channel for measurement The channel can also be selected by the 1590 Thermometer Channel indicator The channel indicator is shows which of the scanner channels if any is se lected for measurement Control Input Rear Panel The control input is located on t...

Page 140: ...s see Section 7 1 11 5 1 1 Scanner Channel The SCANNER CHANNEL soft key can be used to select the channel of the scanner This is equivalent to pressing the appropriate channel button on the scanner The light for that channel on the scanner will turn on and the 1590 will begin measuring the channel The 1590 will use the probe parameters set up for that scanner channel see Section 7 4 11 5 1 2 Scann...

Page 141: ...er of scanner channels or in other words the last scanner channel number in the sequence For the user defined sequence CHANNELS sets the total number of steps in the sequence After the thermometer measures the last channel the sequence repeats starting again at the beginning The NUMBER OF SAMPLES parameter specifies the number of measure ments to make on each channel before advancing to the next T...

Page 142: ...OBE menu are unaffected For a description of these functions see Section 7 4 11 5 2 1 Select Channel The SELECT CHAN soft key allows you to select the channel for which you want to edit the probe parameters Note that this function does not actually change the channel being measured Each of the two 1590 channels and ten scanner channels are assigned one of the 16 probe parameter sets To change the ...

Page 143: ... commands listed in the 1590 manual there are additional commands for operating the 1590 with the scanner These commands are only available when the scanner is connected to the 1590 Thermometer The scanner commands are listed below Command Description Example Scanner Commands ts canner c read measurement on specified scanner channel ts 10 scma ximum c read maximum for specified scanner channel scm...

Page 144: ... user defined sequence for given step n 1 100 c 0 input 2 1 10 scanner 1 10 scuc 1 0 rep etitions n read or set the number of samples to measure at each step in the sequence rep 5 scsc ch read scanner channel stand by current scsc 1 scsc urrent ch n 0 10 500 1000 set scanner channel stand by current no standby current 0 5 mA standby current 0 5 mA standby current 1 mA standby current scsc 1 500 15...

Page 145: ... may be wiped clean with a damp cloth and mild detergent DO NOT use harsh chemicals on the surface that may damage the paint The instrument should be handled with care Avoid knocking dropping or vibrating the instrument This instrument is tested and calibrated at the factory Continued regular testing and calibration is recommended 135 12 Maintenance ...

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Page 147: ...ING soft key in the SAMPLE MENU see Section 7 2 3 If the sample bar indicates the 1575 1590 is actively sampling but the display shows when measuring temperature or resistance the input may not be connected properly Check to make sure your probe is connected as described in Section 4 5 Try connecting a resistor or shorting the input to see if it measures Make sure the probe or resistor is connecte...

Page 148: ...me constant 20 to 60 seconds Make sure the filter threshold is greater than the normal variations in the measurement the message FILTER RESET will be displayed if this is a problem You might be experiencing electromagnetic interference EMI Make sure there are no strong sources of electro magnetic interference near the 1575 1590 or other de vices connected to it Use a probe that has shielded cable ...

Page 149: ...or probe characteriza tion coefficients may be in error see Section 7 4 3 2 Check each of the probe parameters carefully Make sure the 3W OFFSET parameter is 0 unless you are us ing a three wire or two wire probe see Section 7 4 3 5 Make sure the correct probe setup is being used with the measurements Check the resistance temperature con version calculations using the CONV TEST function and compar...

Page 150: ...dary standards type If the probe is a high quality SPRT and this message appears it may indicate there is some error in the data used to calculate the coefficients The display shows negative resis tance when the input is shorted Though you may expect the reading to be exactly 0Ω when the input is shorted electrical noise and limited linearity may cause the reading to be slightly greater or less th...

Page 151: ...Testing The instrument was tested to the immunity requirements of the IEC 61326 1 according to Table 1 Minimum immunity test requirements Criterion B was used for Conducted RF IEC 61000 4 6 and Electric Fast Transit EFT Burst IEC 61000 4 4 Therefore the operation of the instrument may be affected by excessive electromagnetic interference and may not perform within the normal specification limits u...

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Page 153: ...nector 18 21 138 CLEAR GRAPH 82 CLEAR MEMORY 45 coefficients probe 45 47 48 54 color 85 COMM MENU 88 commands 103 123 133 communications 88 99 connector 17 21 contrast 27 control cable 114 126 CONV TEST 69 conversion probe 47 80 conversion time 40 current 31 33 34 50 69 80 D data type display 74 DATA GRAPH 74 date 25 84 dielectric absorption 40 difference 79 digital filter 7 31 41 138 DIGITAL FILT...

Page 154: ...129 integration 7 integration period 41 IPTS 68 48 ITS 90 54 L lead resistance 8 51 leakage 9 40 LOAD PARAMS 85 M maintenance 135 maximum 80 measurement circuitry 6 memory 43 79 MEMORY MENU 43 menu system 37 minimum 80 N noise electrical 9 138 measurement 50 138 nonlinearity 10 O oven 25 95 P PARAM MENU 84 parts and controls 21 23 25 27 116 117 128 password 95 polynomial 49 power 17 22 printer 23 ...

Page 155: ...20 130 SCREEN PARAMS 85 screen saver 85 SECURITY 95 SELECT CHAN 122 132 SELECT DISPLAY 77 SELECT PROBE 46 self heating 9 50 69 serial 23 88 99 serial number 47 81 SET EXT 94 SET INT 95 shield 21 117 129 soft keys 21 25 26 37 specifications 13 113 speed 10 spread 80 SPRT 29 47 standard deviation 80 standby current 51 133 start 40 statistics 7 43 80 stem conduction 32 stop 40 STORE SAMPLE 44 subrang...

Page 156: ...V validation 35 version 97 VIEW MEMORY 44 voltage switch 22 W W T90 49 80 84 WARNING SUBRANGE EXCEEDED 47 140 WARNING THIS PROBE 67 140 warranty 15 WRITE VALUE 44 Index 146 ...

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