Keithley TEC SourceMeter 2510 Service Manual
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Keithley TEC SourceMeter 2510 Service Manual

Keithley TEC SourceMeter 2510 Service Manual

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Models 2510 and 2510-AT TEC SourceMeter
Service Manual
2510-902-01 Rev. E / March 2010
A
G R E A T E R
M E A S U R E
O F
C O N F I D E N C E

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Summary of Contents for Keithley TEC SourceMeter 2510

  • Page 1 .com ® Models 2510 and 2510-AT TEC SourceMeter Service Manual 2510-902-01 Rev. E / March 2010 G R E A T E R M E A S U R E C O N F I D E N C E...
  • Page 2 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
  • Page 4 Models 2510 and 2510-AT TEC SourceMeter Service Manual All references in this manual to the Model 2510 also apply to the Model 2510-AT unless otherwise specified. ©2000-2010, Keithley Instruments, Inc. All rights reserved. Cleveland, Ohio, U.S.A. Fifth Printing, March 2010...
  • Page 5 Revision D (Document Number 2510-902-01)............February 2002 Revision E (Document Number 2510-902-01) .............. March 2010 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand names are trademarks or registered trademarks of their respective holders.
  • Page 6 Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O signals are Installation Category I and must not be directly connected to mains voltage or to voltage sources with high tran- sient over-voltages.
  • Page 7 To maintain protection from electric shock and fire, replacement components in mains circuits, including the power transformer, test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety ap- provals, may be used if the rating and type are the same. Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component.

  • Page 8: Table Of Contents

    Table of Contents Performance Verification Introduction ................1-2 Verification test requirements ............ 1-2 Environmental conditions ........... 1-2 Warm-up period ..............1-2 Line power ................1-3 Recommended test equipment ........... 1-3 Resistor characterization ............. 1-4 Verification limits ............... 1-4 Example limits calculation ..........1-4 Resistance limits calculation ..........
  • Page 9 Changing the password ............... 2-6 Changing the password from the front panel ...... 2-6 Changing the password by remote ........2-6 Resetting the calibration password ..........2-7 Viewing calibration dates and calibration count ......2-7 Calibration errors ................ 2-7 Front panel error reporting ..........2-7 Remote error reporting ............
  • Page 10 Disassembly Introduction ................5-2 Handling and cleaning ............... 5-2 Handling PC boards ............5-2 Solder repairs ..............5-2 Static sensitive devices ............... 5-3 Assembly drawings ..............5-3 Case cover removal ..............5-4 Mother board removal ..............5-4 Front panel disassembly ............. 5-5 Removing power components ............
  • Page 11 Calibration Program Introduction ................C-2 Computer hardware requirements ..........C-2 Software requirements ............... C-2 Calibration equipment ............... C-2 General program instructions ............ C-3 Program C-1 Model 2510 calibration program ....C-4...
  • Page 12 List of Illustrations Performance Verification Figure 1-1 Connections for voltage verification tests ......1-7 Figure 1-2 Connections for current verification tests ......1-9 Figure 1-3 Connections for AC resistance verification test ....1-11 Figure 1-4 Connections for sensor resistance accuracy verification ..1-12 Calibration Figure 2-1 Voltage calibration connections ..........
  • Page 13 List of Tables Performance Verification Table 1-1 Recommended verification equipment ........1-3 Table 1-2 Characterized resistor values ..........1-4 Table 1-3 Sensor resistance measurement accuracy limits ....1-13 Calibration Table 2-1 Recommended calibration equipment ........2-4 Table 2-2 Characterized resistor values ..........2-4 Table 2-3 Calibration menu ..............

  • Page 14: Performance Verification

    Performance Verification...

  • Page 15: Introduction

    NOTE If the instrument is still under warranty and its performance is outside specified lim- its, contact your Keithley representative or the factory to determine the correct course of action. Verification test requirements Be sure that you perform the verification tests: •...

  • Page 16: Line Power

    Generally, test equipment uncertainty should be at least four times better than corresponding Model 2510 specifications. Table 1-1 Recommended verification equipment Description Manufacturer/Model Specifications Digital Multimeter Keithley 2002 DC Voltage 20V: ±6.8ppm Resistance 20Ω: ±23ppm 200Ω: ±19ppm...

  • Page 17: Resistor Characterization

    Models 2510 and 2510-AT Performance Verification Resistor characterization The resistors listed in Table 1-1 must be characterized using the 4-wire ohms function of the recommended DMM before use. Be sure to use the lowest resistance range possible for each measurement for best accuracy. Characterized values can be recorded in Table 1-2. Table 1-2 Characterized resistor values Nominal resistance...

  • Page 18: Restoring Factory Defaults

    Performance Verification Models 2510 and 2510-AT Restoring factory defaults Before performing the verification procedures, restore the instrument to its factory front panel (BENCH) defaults as follows: Press the MENU key. The instrument will display the following prompt: MAIN MENU SAVESETUP COMMUNICATION CAL ©...

  • Page 19: Test Considerations

    Models 2510 and 2510-AT Performance Verification Test considerations WARNING The maximum common-mode voltage (voltage between INPUT/OUTPUT - terminals and chassis ground) is 30V DC. Exceeding this value may cause a shock hazard. CAUTION The maximum voltage between INPUT/OUTPUT sense (S) terminals is 1V.

  • Page 20: Voltage Readback Accuracy

    Performance Verification Models 2510 and 2510-AT Using the EDIT keys, adjust the Model 2510 voltage setpoint to exactly +9.000V. Verify that the DMM reading is within 8.987 to 9.013V limits. Repeat steps 5 and 6 for a -9.000V output value. Turn off the output when the test is completed.

  • Page 21: Voltage Limit Accuracy

    Models 2510 and 2510-AT Performance Verification Voltage limit accuracy Follow the steps below to verify that Model 2510 voltage limit accuracy is within specified limits. The test involves setting the voltage limit to a specific value and making sure the output voltage is limited to the required value.

  • Page 22: Current Readback Accuracy

    Performance Verification Models 2510 and 2510-AT Figure 1-2 Connections for current verification tests 1Ω Resistor OUTPUT S- OUTPUT F+ Connect sense (S) leads as close as possible to resistor body. OUTPUT F- OUTPUT S+ WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. SENSE INPUT Ω...

  • Page 23: Current Limit Accuracy

    Models 2510 and 2510-AT Performance Verification 1-10 Current limit accuracy Follow the steps below to verify that Model 2510 current limit accuracy is within specified limits. The test involves setting the current limit to a specific value and making sure the current is limited to the required value.

  • Page 24: Sensor Measurement Accuracy

    1-11 Performance Verification Models 2510 and 2510-AT Figure 1-3 100Ω Resistor Connections for OUTPUT S- OUTPUT F+ Connect sense (S) leads as close as possible to resistor body. AC resistance OUTPUT F- OUTPUT S+ verification test WARNING: WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
  • Page 25 Models 2510 and 2510-AT Performance Verification 1-12 Figure 1-4 100Ω, 1kΩ, 10kΩ, Connections for sensor or 100kΩ Resistor resistance accuracy INPUT S- Connect sense (S) leads as close INPUT F+ verification as possible to resistor body. INPUT F- INPUT S+ WARNING: WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
  • Page 26 1-13 Performance Verification Models 2510 and 2510-AT NOTE The reading limits in Table 1-3 are based on nominal resistance values. Recalculate new limits based on characterized resistance values and Model 2510 one-year ther- mistor sensor accuracy specifications (see Appendix A). Repeat steps 1 through 5 for the remaining resistance values in Table 1-3.
  • Page 27 Models 2510 and 2510-AT Performance Verification 1-14...

  • Page 28: Calibration

    Calibration...

  • Page 29: Introduction

    Calibration Models 2510 and 2510-AT Introduction Use the procedures in this section to calibrate the Model 2510. These procedures require accurate test equipment to measure precise DC voltages and resistances. Calibration can be performed either from the front panel or by sending SCPI calibration commands over the IEEE-488 bus or RS-232 port with the aid of a computer.

  • Page 30: Calibration Considerations

    Models 2510 and 2510-AT Calibration Calibration considerations WARNING The maximum common-mode voltage (voltage between INPUT/OUTPUT - terminals and chassis ground) is 30V DC. Exceeding this value may cause a shock hazard. CAUTION The maximum voltage between INPUT/OUTPUT sense (S) terminals is 1V.

  • Page 31: Resistor Characterization

    Calibration Models 2510 and 2510-AT Table 2-1 Recommended calibration equipment Description Manufacturer/Model Specifications Digital Multimeter Keithley 2002 DC Voltage 20V: ±6.8ppm Resistance 20Ω: ±23ppm 200Ω: ±19ppm 2kΩ: ±7.4ppm 20kΩ ±7.4ppm 200kΩ: ±29.8ppm Resistors Isotec RUG-Z-1R00-0.1 1Ω, ±0.1%, 100W 100Ω, ±1% 1kΩ, ±1%...

  • Page 32: Calibration Menu

    Models 2510 and 2510-AT Calibration Calibration menu Table 2-3 summarizes the main calibration menu selections. To enter the calibration menu, press the MENU key, select CAL, then press ENTER. Use the EDIT keys to move the cursor and scroll through menu selections. Press ENTER to select a MENU item. Table 2-3 Calibration menu Menu selection...

  • Page 33: Unlocking Calibration By Remote

    Calibration Models 2510 and 2510-AT Unlocking calibration by remote To unlock calibration via remote, send the following command: :CAL:PROT:CODE '<password>' For example, the following command uses the default password: :CAL:PROT:CODE 'KI002510' Changing the password The default password (002510) may be changed from the front panel or via remote as discussed.

  • Page 34: Resetting The Calibration Password

    Models 2510 and 2510-AT Calibration Resetting the calibration password If you lose the calibration password, you can unlock calibration by shorting together the CAL pads, which are located on the display board. Doing so will reset the password to the fac- tory default (002510, front panel;...

  • Page 35: Aborting Calibration Steps

    Calibration Models 2510 and 2510-AT Aborting calibration steps To abort a calibration step from the front panel, press the EXIT key. To abort a calibration step via remote, send the :ABORt command. Front panel calibration The front panel calibration procedure described below calibrates all functions. Note that each function is separately calibrated, and the procedure must be performed in the order shown.

  • Page 36: Figure 2-1 Voltage Calibration Connections

    Models 2510 and 2510-AT Calibration Table 2-4 Calibration step summary Function* Calibration step Test connections VOLTAGE Output +8.5V DMM to OUTPUT terminals (Figure 2-1) Output 0V DMM to OUTPUT terminals (Figure 2-1) Output -8.5V DMM to OUTPUT terminals (Figure 2-1) CURRENT 1Ω...
  • Page 37 2-10 Calibration Models 2510 and 2510-AT Select the DMM DC voltage function, and enable auto-range. Press ENTER. The unit will then prompt for the +8.5V step: VOLTAGE CAL Press ENTER to output +8.5V NOTE The output will turn on automatically when you perform the next step. Press ENTER.

  • Page 38: Figure 2-2 Current And Current Protection Calibration Connections

    Models 2510 and 2510-AT Calibration 2-11 Step 3: Current and current protection calibration From the CAL EXECUTE menu, select CURRENT, then press ENTER. The instru- ment will display the following message: CURRENT CAL Connect a 1Ω load to Peltier. © Then press ENTER.

  • Page 39: Figure 2-3 Thermistor And Rtd Calibration Resistor Connections

    2-12 Calibration Models 2510 and 2510-AT Step 4: Temperature calibration Connect the 100Ω resistor to the Model 2510 INPUT terminals, as shown in Figure 2-3. From the CAL EXECUTE menu, select TEMPERATURE, then press ENTER. The instrument will display the following message: TEMPERATURE CAL THERMISTOR RTD I-SS V-SS Figure 2-3...

  • Page 40: Figure 2-4 Shorted Input Calibration Connections

    Models 2510 and 2510-AT Calibration 2-13 Figure 2-4 Short INPUT Terminals with Clean Copper Wire Shorted input calibration connections WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. IEEE-488 MADE IN (ENTER IEEE ADDRESS OUTPUT INPUT U.S.A. WITH FRONT PANEL MENU) F+ S+ S- F- F+ F- S+ S- ENABLE-DIG I/O ISOLATION FROM EARTH: 30V MAX.
  • Page 41 2-14 Calibration Models 2510 and 2510-AT From the THERMISTOR CAL menu, select 10kΩ, then press ENTER. The unit will display the following: THERMISTOR CAL Connect 10kΩ to temperature © sensor and press ENTER. ß Connect the 10kΩ resistor to the Model 2510 INPUT terminals (Figure 2-3). Press ENTER.
  • Page 42 Models 2510 and 2510-AT Calibration 2-15 Press ENTER to complete the shorted calibration step, then remove the shorting wires from the INPUT terminals. Press EXIT to return to the TEMPERATURE CAL menu. Select RTD, then press ENTER. The unit displays the following: RTD CAL Connect 100Ω...
  • Page 43 2-16 Calibration Models 2510 and 2510-AT Press ENTER to complete the shorted calibration step, then remove the shorting wires from the INPUT terminals. From the TEMPERATURE CAL menu, select I-SS, then press ENTER. The unit dis- plays the following: I-SS CAL Connect 1kΩ...
  • Page 44 Models 2510 and 2510-AT Calibration 2-17 Press ENTER to complete the shorted calibration step, then remove the shorting wires from the INPUT terminals. Press EXIT to return to the CAL EXECUTE menu. Figure 2-5 I-SS and V-SS calibration Connect sense (S) 1kΩ...

  • Page 45: Figure 2-6 Ac Ohms Calibration Connections

    2-18 Calibration Models 2510 and 2510-AT Step 5: AC ohms calibration From the CAL EXECUTE menu, select AC-OHMS, then press ENTER. The instru- ment will display the following message: AC-OHMS CAL Connect a 100Ω load to Peltier. © Then press ENTER. ß...
  • Page 46 Models 2510 and 2510-AT Calibration 2-19 Step 7: Enter calibration dates and save calibration NOTE For temporary calibration without saving new calibration constants, proceed to Step 8: Lock out calibration. From the CALIBRATION menu, select SAVE, then press ENTER. The unit will prompt you for the calibration date: CAL DATE: 02/15/2000 , ENTER or EXIT.

  • Page 47: Remote Calibration

    2-20 Calibration Models 2510 and 2510-AT Remote calibration Use the following procedure to perform remote calibration by sending SCPI commands over the IEEE-488 bus or RS-232 port. The remote commands and appropriate parameters are sepa- rately summarized for each step. Remote calibration command summary Table 2-5 summarizes remote calibration commands used in this section.

  • Page 48: Remote Calibration Procedure

    Models 2510 and 2510-AT Calibration 2-21 Remote calibration procedure Step 1: Prepare the Model 2510 for calibration With the power off, connect the Model 2510 to the controller IEEE-488 interface or RS-232 port using a shielded interface cable. Turn on the Model 2510 and the test equipment, and allow them to warm up for at least one hour before performing calibration.
  • Page 49 2-22 Calibration Models 2510 and 2510-AT Table 2-6 (cont.) Remote calibration step summary Calibrated function Calibration command Test connections Temperature :SYST:RSEN ON Thermistor :SENS:TEMP:TRAN THER sensor :SENS:TEMP:THER:RANG 100 :CAL:PROT:TEMP <Resistance_Value> 100Ω to INPUT (Figure 2-3) :CAL:PROT:TEMP 0 Short to INPUT (Figure 2-4) :SENS:TEMP:THER:RANG 1e3 :CAL:PROT:TEMP <Resistance_Value>...
  • Page 50 Models 2510 and 2510-AT Calibration 2-23 Step 2: Voltage calibration Connect the DMM to the Model 2510 OUTPUT terminals, as shown in Figure 2-1. Select the DMM DC voltage function, and enable auto-range. Send this command to turn on the output: :OUTP ON Send the following command to output +8.5V: :SOUR:VOLT 8.5...
  • Page 51 2-24 Calibration Models 2510 and 2510-AT With the 1Ω resistor still connected, send the following command to calibrate the cur- rent protection DAC: :CAL:PROT:IPD Send this command to turn off the output: :OUTP OFF Disconnect the 1Ω resistor from the OUTPUT terminals. Step 4: Temperature calibration Connect the 100Ω...
  • Page 52 Models 2510 and 2510-AT Calibration 2-25 Send this command to select the 100kΩ resistance range: :SENS:TEMP:THER:RANG 1e5 Send the following command with the characterized 100kΩ resistance value as the parameter to calibrate the 100kΩ range: :CAL:PROT:SENS:TEMP <Resistance_Value> Short the INPUT terminals with clean copper wire (Figure 2-4). Allow one minute for thermal equilibrium, then send this command: :CAL:PROT:SENS:TEMP 0 Connect the 100Ω...
  • Page 53 2-26 Calibration Models 2510 and 2510-AT Note the DMM reading, then send the following command with the DMM reading value as the parameter to calibrate the current type solid-state sensor: :CAL:PROT:SENS:TEMP <DMM_Reading> Short the INPUT terminals with clean copper wire (Figure 2-4). Allow one minute for thermal equilibrium, then send this command: :CAL:PROT:SENS:TEMP 0 Step 5: AC ohms calibration...

  • Page 54: Routine Maintenance

    Routine Maintenance...

  • Page 55: Introduction

    Routine Maintenance Models 2510 and 2510-AT Introduction The information in this section deals with routine type maintenance that can be performed by the operator. Line fuse replacement WARNING Disconnect the line cord at the rear panel, and remove all test leads con- nected to the instrument (front and rear) before replacing the line fuse.
  • Page 56 If the power line fuse continues to blow, a circuit malfunction exists and must be corrected. Refer to the troubleshooting information in Section 4 of this manual for additional information. Table 3-1 Power line fuse Line voltage Rating Keithley part no. 100-240V 250V, 2.5A, Slow FU-106-2.5 Blow 5 × 20mm...
  • Page 57 Routine Maintenance Models 2510 and 2510-AT...

  • Page 58: Troubleshooting

    Troubleshooting...

  • Page 59: Introduction

    Troubleshooting Models 2510 and 2510-AT Introduction This section of the manual will assist you in troubleshooting and repairing the Model 2510. Included are self-tests, test procedures, troubleshooting tables, and circuit descriptions. Note that disassembly instructions are located in Section 5, and component layout drawings are at the end of Section 6.

  • Page 60: Power-On Self-Test

    Models 2510 and 2510-AT Troubleshooting Power-on self-test During the power-on sequence, the Model 2510 will perform a checksum test on its EPROM and test its RAM. If one of these tests fails, the instrument will lock up. Front panel tests There are three front panel tests: one to test the functionality of the front panel keys and two to test the display.

  • Page 61: Display Patterns Test

    Troubleshooting Models 2510 and 2510-AT DISPLAY PATTERNS test The display test lets you verify that each pixel and annunciator in the vacuum fluorescent display is working properly. Perform the following steps to run the display test: Display the MAIN MENU by pressing the MENU key. Select TEST, and press ENTER to display the SELF-TEST MENU.

  • Page 62: Principles Of Operation

    Models 2510 and 2510-AT Troubleshooting Principles of operation The following information is provided to support the troubleshooting tests and procedures covered in this section of the manual. Overall block diagram Figure 4-1 shows an overall block diagram of the Model 2510. Circuitry may be divided into three general areas: •...

  • Page 63: Analog Circuits

    Troubleshooting Models 2510 and 2510-AT Analog circuits Figure 4-2 shows a block diagram of the analog circuits. These circuits are discussed in more detail in the following paragraphs. Figure 4-2 Class D Pulse Output Block diagram of Output Width Filter H Drive Stage OUTPUT...

  • Page 64: Figure 4-3 Simplified Schematic Of Class D Amplifier

    Models 2510 and 2510-AT Troubleshooting Figure 4-3 Simplified schematic of class D amplifier...
  • Page 65 Troubleshooting Models 2510 and 2510-AT H-bridge Figure 4-4 shows a simplified schematic of the H-bridge output stage switching as well as the pulse-width modulator waveforms. The four output stage transistors function as simple switches with the switching phases and duty cycles controlled by the pulse-width modulator as shown.

  • Page 66: Figure 4-5 H-Bridge Switching And Step-Down Regulator

    Models 2510 and 2510-AT Troubleshooting Figure 4-5 shows alternate switching phases of the H-bridge output stage as well as a simpli- fied schematic of the step-down “buck” regulator. Note that the bridge switches between alter- nate configurations as shown, with the duration and duty cycles controlled by the pulse-width modulator.

  • Page 67: Figure 4-6 Sensor Conditioning For 10Kω Thermistor

    4-10 Troubleshooting Models 2510 and 2510-AT Measurement circuits Signal conditioning for the external temperature sensor is provided by U124, U149, and associated components. Voltage and current feedback signals from the TEC output terminals are developed by U147 and U151. The conditioned temperature sensor, voltage, and current, feedback signals are fed to the multiplexer IC, U142, that switches among the signals during the various phases of the mea- surement cycle.
  • Page 68 Models 2510 and 2510-AT Troubleshooting 4-11 A constant current is forced through the DUT (thermistor) as well as a reference resistor (in this example, 10kΩ for the 10kΩ range). As various phases of the measurement cycle, the volt- ages across the DUT and 10kΩ reference resistor are measured, and the actual DUT resistance is computed from the ratio of the two voltages.

  • Page 69: Power Supply

    4-12 Troubleshooting Models 2510 and 2510-AT As previously discussed, source control information from the 68332 processor is fed to the HDAC where it is converted into an analog signal to control the class D amplifier output. Power supply Figure 4-8 shows a block diagram of the Model 2510 power supply system. Figure 4-8 Analog Circuits Class D...

  • Page 70: Digital Circuitry

    Models 2510 and 2510-AT Troubleshooting 4-13 Digital circuitry Refer to Figure 4-9 for the following discussion on digital circuitry. Figure 4-9 Digital circuitry overall block diagram U168 U160 Serial RS-232 Interface Interface Reset U166 E PROM U141 GPIB Microprocessor IEEE-488 Interface U167, U169 U163 U170...

  • Page 71: Figure 4-10 Digital Control Circuits

    4-14 Troubleshooting Models 2510 and 2510-AT Figure 4-10 shows a diagram for digital control that includes serial-to-parallel converters U134 to U136 and associated control signal nomenclatures. Figure 4-10 Digital control circuits A/D IN MEAS_DUT_HI* U136 U135 MUXC MEAS_DUT_LO* MUXB GND+* MUXA GND-* 10_MA Range*...

  • Page 72: Display Board Circuits

    Models 2510 and 2510-AT Troubleshooting 4-15 Display board circuits U902 is the display microcontroller that controls the VFD (vacuum fluorescent display) and interprets key data. The microcontroller has four peripheral I/O ports that are used for the vari- ous control and read functions. Display data is serially transmitted to the microcontroller from the digital board via the TXB line to the microcontroller PD0 terminal.

  • Page 73: Power Supply Checks

    4-16 Troubleshooting Models 2510 and 2510-AT Power supply checks Power supply problems can be checked out using Table 4-2. See “Principles of operation” for circuit theory on the power supply. Table 4-2 Power supply checks Step Item/component Required condition Remarks Line fuse Check continuity.

  • Page 74: Analog Circuitry Checks

    Models 2510 and 2510-AT Troubleshooting 4-17 Analog circuitry checks Table 4-4 summarizes analog circuitry checks. NOTE All measurements are with the V function selected, +5V output voltage, 5A current Ω Ω limit, and 1 and 100 resistors connected to the OUTPUT and INPUT terminals respectively.

  • Page 75: Digital I/O +5V Supply Fuse Replacement

    Section 6 for location. Carefully unsolder the blown fuse. Replace the fuse with one with the following rating: 0.6A, Keithley part number FU-103, then solder it in place. After soldering, clean the mother board as covered in Section 5, “Handling and clean- ing precautions.”...

  • Page 76: Disassembly

    Disassembly...

  • Page 77: Introduction

    Disassembly Models 2510 and 2510-AT Introduction This section explains how to handle, clean, and disassemble the Model 2510. Disassembly drawings are located at the end of this section. Handling and cleaning To avoid contaminating PC board traces with body oil or other foreign matter, avoid touch- ing the PC board traces while you are repairing the instrument.

  • Page 78: Static Sensitive Devices

    Use the assembly drawings located at the end of this section to assist you as you disassemble and reassemble the Model 2510. Refer to these drawings for information about the Keithley part numbers of most mechanical parts in the unit. Assembly drawings include: •...

  • Page 79: Case Cover Removal

    Disassembly Models 2510 and 2510-AT Case cover removal Follow the steps below to remove the case cover to gain access to internal parts. WARNING Before removing the case cover, disconnect the line cord and any test leads from the instrument. Remove handle —...

  • Page 80: Front Panel Disassembly

    Models 2510 and 2510-AT Disassembly Remove mother board. Slide the mother board forward until the slots line up with the guide pins, then remove the board. During reassembly, replace the mother board, and start the IEEE-488, ENABLE-DIG I/O, and RS-232 connector screws and the board mounting screws. Tighten all the fas- teners once they are all in place and the board is correctly aligned.

  • Page 81: Power Module Removal

    Disassembly Models 2510 and 2510-AT Power module removal Perform the following steps to remove the rear panel power module: Disconnect the power module's ground wire. This green and yellow wire connects to a threaded stud on the chassis with a kep nut. Squeeze the latches on either side of the power module while pushing the module from the access hole.

  • Page 82: Replaceable Parts

    Replaceable Parts...

  • Page 83: Parts Lists

    Component designation (if applicable) • Keithley part number Factory service If the instrument is to be returned to Keithley Instruments for repair, perform the following: • Call the Repair Department at 1-800-552-1115 for a Return Material Authorization (RMA) number. •...
  • Page 84 Models 2510 and 2510-AT Replaceable Parts Table 6-1 Mother board parts list Keithley Circuit designation Description part no. C101,C102,C204,C205,C206,C207 CAP, 680U, 20%, 50V ALUM ELEC C-578-680 C103,C106 CAP, 2.2U, 10%, 50V TANTALUM C-563-2.2 C104,105,118,121,122,125,126,127,157,158 CAP, .1UF, 20%, 50V CERAMIC C-418-.1 C107,109,112,114,135,136,143,152,155,161 CAP, .1UF, 10%, 25V, CERAMIC...
  • Page 85 Replaceable Parts Models 2510 and 2510-AT Table 6-1 (cont.) Mother board parts list Keithley Circuit designation Description part no. CR102 ULTRA FAST BRIDGE RECTIFIER, EDF1BM RF-123 CR103,CR104,CR105,CR106 ULTRAFAST POWER RECTIFIER RF-107 CR107,CR108,CR130 DIODE, SWITCHING, MMBD914 RF-83 CR109,CR110,CR111,CR112,CR133 DIODE, SWITCHING, MMSD914T19...
  • Page 86 Models 2510 and 2510-AT Replaceable Parts Table 6-1 (cont.) Mother board parts list Keithley Circuit designation Description part no. Q111,Q116,Q117 TRANS, P-CHAN, MOSFET, TP0610T TG-259 Q112,Q113,Q114,Q115,Q120,Q121,Q122,Q123 TRANS, N-MOSFET, VN0605T TG-243 Q124,Q125,Q126,Q127 TRANS, N-MOSFET, VN0605T TG-243 R101,R103,R104,R105,R188 RES, 10, 5%, 125MW METAL FILM...
  • Page 87 Replaceable Parts Models 2510 and 2510-AT Table 6-1 (cont.) Mother board parts list Keithley Circuit designation Description part no. R176 RES, 1K, .1%, 1/10W, METAL FILM R-263-1K R179 RES, 100K, .1%, 1/10W, METAL FILM R-263-100K R180 RES, 34K, 1%, 100MW, THICK FILM...
  • Page 88 Models 2510 and 2510-AT Replaceable Parts Table 6-1 (cont.) Mother board parts list Keithley Circuit designation Description part no. TP121,TP122 SURFACE MOUNT PCB TEST POINT CS-1026 U101 IC, +5V VOLTAGE REGULATOR, LM2940CT IC-576 U102 IC, VOLTAGE REGULATOR IC-1133 U103 IC, -15V VOLTAGE REGULATOR...
  • Page 89 Replaceable Parts Models 2510 and 2510-AT Table 6-1 (cont.) Mother board parts list Keithley Circuit designation Description part no. U147,U151 IC, DIFFERENTIAL AMP, INA117P IC-889 U148 IC, OP-AMP, LOW NOISE LT1007CS8 IC-949 U149 IC, OPAMP IC-1357 U155,U158,U154 IC, HCPL0631, PACK...
  • Page 90 Models 2510 and 2510-AT Replaceable Parts Table 6-2 Display board parts list Keithley Circuit designation Description part no. C901 CAP, 22UF, 20%, 6.3 TANTALUM C-417-22 C902,C904,C907,C908,C910 CAP, .1UF, 20%,100V, CERAMIC C-436-.1 C903,C905,C906,C909,C911 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1 C912 CAP, 2.2UF, 20%,100V, ALUM ELEC C-503-2.2...
  • Page 91 6-10 Replaceable Parts Models 2510 and 2510-AT Table 6-3 Miscellaneous parts list Qty. Description Keithley part no. BEZEL, REAR 428-303D CHASSIS 2510-301A CONDUCTIVE RUBBER SWITCH 2510-315A COVER 2510-307A DISPLAY LENS 2510-311B FN-39-1 FOOT 428-319A FOOT, EXTRUDED FE-22A FOOT,RUBBER FE-6 FUSE HOLDER FH-39 FUSE, EXP.

  • Page 92: Specifications

    Specifications...
  • Page 93 Specifications Models 2510 and 2510-AT 2510 TEC SourceMeter The Model 2510 Thermoelectric Cooler Controller is designed to: TEC OUTPUT SPECIFICATIONS • control the power to the TEC to maintain a constant temperature, current, voltage, or thermistor resistance OUTPUT RANGE: ±10 VDC at up to ±5 ADC. •...
  • Page 94 Models 2510 and 2510-AT Specifications Accuracy calculations The information below discusses how to calculate accuracy for both TEC measurement and thermal feedback element specifications. Accuracy specifications are stated as follows: Accuracy = ±(% of reading + offset) As an example of how to calculate the actual limits, assume an output voltage of 5V. You can compute the limits from one-year operating voltage accuracy specifications as follows: Accuracy = ±(% of reading + offset)
  • Page 95 Specifications Models 2510 and 2510-AT...

  • Page 96: Calibration Reference

    Calibration Reference...

  • Page 97: Introduction

    Calibration Reference Models 2510 and 2510-AT Introduction This appendix contains detailed information on the various Model 2510 remote calibration commands, calibration error messages, and methods to detect the end of each calibration step. Section 2 of this manual covers detailed calibration procedures. Command summary Table B-1 summarizes Model 2510 calibration commands.

  • Page 98: Miscellaneous Commands

    Models 2510 and 2510-AT Calibration Reference Miscellaneous commands Miscellaneous commands are those commands that perform such functions as unlocking calibration, saving calibration constants, locking out calibration, and programming date parameters. :CODE (:CALibration:PROTected:CODE) Purpose To unlock calibration so that you can perform the calibration procedures. Format :cal:prot:code '<password>' Parameters...
  • Page 99 Calibration Reference Models 2510 and 2510-AT :LOCK (:CALibration:PROTected:LOCK) Purpose To lock out calibration. Format :cal:prot:lock Query :cal:prot:lock? Response Calibration unlocked Calibration locked Description The :LOCK command allows you to lock out calibration after completing the procedure. Thus, :LOCK performs the opposite of sending the password with the :CODE command.
  • Page 100 Models 2510 and 2510-AT Calibration Reference :DATE (:CALibration:PROTected:DATE) Purpose To program the calibration date. Format :cal:prot:date <year>, <month>, <day> Parameters <year> = 2000 to 2099 <month> = 1 to 12 <day> = 1 to 31 Query :cal:prot:date? Response <year> , <month> , <day> Description The :DATE command allows you to store the calibration date in instrument EEROM for future reference.

  • Page 101: Sense Commands

    Calibration Reference Models 2510 and 2510-AT SENSe commands :VOLTage (:CALibration:PROTected:SENSe:VOLTage) (:CALibration:PROTected:SENSe:VOLTage:DATA?) Purpose To calibrate the Peltier voltage measurement. Format :cal:prot:sens:volt <DMM_Reading> Parameters <DMM_Reading> = 3.5 to 12.5[V] = cal at + F.S. -2.5 to 2.5[V] = zero cal -3.5 to -12.5[V] = cal at - F.S. Query :cal:prot:sens:volt:data? Description...
  • Page 102 Models 2510 and 2510-AT Calibration Reference :TEMPerature (:CALibration:PROTected:SENSe:TEMPerature) (:CALibration:PROTected:SENSe:TEMPerature:DATA?) Purpose To calibrate the temperature sensor measurements. Format :cal:prot:sens:temp <Value> Parameters <Resistor_Value> = 100kΩ thermistor: 0 to 125e3[Ω] 10kΩ thermistor: 0 to 12.5e3[Ω] 1kΩ thermistor: 0 to 1.25e3[Ω] 100Ω thermistor: 0 to 125[Ω] 100Ω...

  • Page 103: Source Commands

    Calibration Reference Models 2510 and 2510-AT SOURce commands :SOURCE (:CALibration:PROTected:SOURce) (:CALibration:PROTected:SOURce:DATA?) Purpose To calibrate the Peltier source/sense voltage. Format :cal:prot:sour <DMM_Reading> Parameters <DMM_Reading> = 3.5 to 12.5[V] = cal at + F.S. -2.5 to 2.5[V] = zero cal -3.5 to -12.5[V] = cal at - F.S. Query :cal:prot:sour:data? Description...

  • Page 104: Dac Commands

    Models 2510 and 2510-AT Calibration Reference DAC commands :IPDac (:CALibration:PROTected:IPDac) (:CALibration:PROTected:IPDac:DATA?) Purpose To calibrate the current protection DAC. Format :cal:prot:ipd Query :cal:prot:ipd:data? Description The :CAL:PROT:IPD command calibrates the current protection DAC. A resistor of less than 1.5Ω must be connected to the OUTPUT terminals before this command is sent.

  • Page 105: Detecting Calibration Errors

    B-10 Calibration Reference Models 2510 and 2510-AT Detecting calibration errors If an error occurs during any calibration step, the Model 2510 will generate an appropriate error message. Several methods to detect calibration errors are discussed below. Reading the error queue As with other Model 2510 errors, any calibration errors will be reported in the error queue.
  • Page 106 Models 2510 and 2510-AT Calibration Reference B-11 Table B-2 Calibration errors Error number Error message +500 “Date of calibration not set” +501 “Next date of calibration not set” +502 “Calibration data invalid” +509 “Not permitted with cal locked” +510 “Not permitted with cal un-locked” +520 “Source + gain data invalid”...

  • Page 107: Detecting Calibration Step Completion

    B-12 Calibration Reference Models 2510 and 2510-AT Detecting calibration step completion When sending remote calibration commands, you must wait until the instrument completes the current operation before sending another command. You can use either *OPC? or *OPC to help determine when each calibration step is completed. Using the *OPC? query With the *OPC? (operation complete) query, the instrument will place an ASCII 1 in the output queue when it has completed each step.

  • Page 108: Generating An Srq On Calibration Complete

    Models 2510 and 2510-AT Calibration Reference B-13 Generating an SRQ on calibration complete An IEEE-488 bus SRQ (service request) can be used to detect operation complete instead of repeatedly polling the Model 2510. To use this method, send both *ESE 1 and *SRE 32 to the instrument, then include the *OPC command at the end of each calibration command line, as covered above.
  • Page 109 B-14 Calibration Reference Models 2510 and 2510-AT...

  • Page 110: Calibration Program

    Calibration Program...

  • Page 111: Introduction

    The following computer hardware is required to run the calibration programs: • IBM PC compatible computer. • Keithley KPC-488.2, KPS-488.2, or KPC-488.2AT, or CEC PC-488 IEEE-488 interface for the computer. • Two shielded IEEE-488 connecting cables (Keithley Model 7007). Software requirements In order to use the calibration programs, you will need the following computer software: •...

  • Page 112: General Program Instructions

    Models 2510 and 2510-AT Calibration Program General program instructions With the power off, connect the Model 2510 and the digital multimeter to the IEEE-488 interface of the computer. Be sure to use shielded IEEE-488 cables for bus connections. Turn on the computer, the Model 2510, and the digital multimeter. Allow the Model 2510 and the multimeter to warm up for at least one hour before performing calibration.

  • Page 113: Program C-1 Model 2510 Calibration Program

    Calibration Program Models 2510 and 2510-AT Program C-1 Model 2510 calibration program ‘ Model 2510 calibration program for use with Keithley 2002 DMM. ‘ 2510 primary address = 15. 2002 primary address = 16. OPEN “IEEE” FOR OUTPUT AS #1 ‘...
  • Page 114 Models 2510 and 2510-AT Calibration Program CASE 20, 23, 26, 29, 33, 36, 42 PRINT “Short INPUT terminals with clean copper wire.” PRINT “Wait 1 minute.” GOSUB KeyCheck CASE 38, 41 PRINT “Connect 1k ohm resistor and DMM to INPUT terminals.” IF I = 38 THEN Cmd$ = Cmd$ + R$(2) GOSUB KeyCheck CASE 43...
  • Page 115 Calibration Program Models 2510 and 2510-AT ‘ ErrCheck: ‘ Error check routine. PRINT #1, “OUTPUT 15;:SYST:ERR?” ‘ Query error queue. PRINT #1, “ENTER 15” INPUT #2, E, Err$ IF E <> 0 THEN PRINT Err$: GOTO ErrCheck’ Display error. RETURN ‘...
  • Page 116 Index Connections AC ohms calibration 2-18 Current and current protection calibration 2-11 for AC resistance verification test 1-11 Aborting calibration steps 2-8 for current verification tests 1-9 AC resistance accuracy 1-10 for sensor resistance accuracy Accuracy calculations A-5 verification 1-12 Analog circuitry checks 4-17 for voltage verification tests 1-7 Assembly drawings 5-3...
  • Page 117 Factory service 6-2 Parts list Front panel calibration 2-8 Display board 6-9 Front panel disassembly 5-5 Miscellaneous 6-10 Front panel tests 4-3 Mother board 6-3 CHAR SET test 4-4 Parts lists 6-2 DISPLAY PATTERNS test 4-4 Performance Verification 1-1 KEYS test 4-3 Performing the verification test procedures 1-5 Fuse replacement Adjusting setpoints 1-6...
  • Page 118 Safety considerations 4-2 Unlocking calibration 2-5 SENSe commands B-6 by remote 2-6 :CURRent B-6 from the front panel 2-5 :TEMPerature B-7 :VOLTage B-6 Sensor conditioning 4-10 Verification limits 1-4 Sensor measurement accuracy 1-11 Example limits calculation 1-4 Sensor resistance measurement accuracy Resistance limits calculation 1-4 limits 1-13 Verification test requirements 1-2...
  • Page 120 M E A S U R E C O N F I D E N C E Keithley Instruments, Inc. Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY • www.keithley.com 12/06...

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