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VTI Instruments Ametek EX1200A Series User Manual

High-density switch/measure and control systems
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  • Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Visit our website - Click HERE...
  • Page 2 EX1200A S ERIES ENSITY WITCH EASURE ONTROL YSTEMS ’ ANUAL P/N: 82-0132-000 Rev February 9 , 2017 VTI Instruments Corp. 2031 Main Street Irvine, CA 92614-6509 (949) 955-1894...

  • Page 3: Table Of Contents

    VTI Instruments Corp. ABLE OF ONTENTS ..............................2 ABLE OF ONTENTS Certification ................................5 Warranty ................................5 Limitation of Warranty ............................5 Trademarks ................................5 Restricted Rights Legend ............................5 ..........................6 ECLARATION OF ONFORMITY ..........................7 ECLARATION OF ONFORMITY ..........................
  • Page 4 www.vtiinstruments.com DMM M ..........................77 EASUREMENT ASICS Select an Input Connector ........................... 77 Configure the Measurement ..........................78 Configure Triggering ............................78 Take the Measurement ............................80 Retrieve the Data ..............................80 DMM F ..............................81 UNCTIONS Range .................................. 81 Resolution ................................
  • Page 5 VTI Instruments Corp. Connecting to the EX1200A ..........................148 Login into SFP ..............................149 Time Configuration ............................150 Performing Calibration ............................. 150 Performing Verification ............................ 152 A ................................155 PPENDIX ............................. 155 NBOARD EMORY Memory Listings and Clearing Procedures....................... 155 B ................................

  • Page 6: Certification

    VTI Instruments Corp. shall not be liable for injury to property other than the goods themselves. Other than the limited warranty stated above, VTI Instruments Corp. makes no other warranties, express or implied, with respect to the quality of product beyond the description of the goods on the face of the contract.

  • Page 7: Declaration Of Conformity

    RODUCT ONFIGURATIONS VTI Instruments declares that the aforementioned product conforms to the requirements of the Low Voltage directive (European Council directive 2014/35/EU, dated 22 July 1993) and the Electromagnetic Compatibility directive (European Council directive 2014/30/EU; generally referred to as the EMC directive).
  • Page 8 RODUCT ONFIGURATIONS VTI Instruments declares that the aforementioned product conforms to the requirements of the Low Voltage directive (European Council directive 2014/35/EU, dated 22 July 1993) and the Electromagnetic Compatibility directive (European Council directive 2014/30/EU; generally referred to as the EMC directive).

  • Page 9: General Safety Instructions

    VTI Instruments Corp. ENERAL AFETY NSTRUCTIONS Review the following safety precautions to avoid bodily injury and/or damage to the product. These precautions must be observed during all phases of operation or service of this product. Failure to comply with these precautions, or with specific warnings elsewhere in this manual, violates safety standards of design, manufacture, and intended use of the product.
  • Page 10 www.vtiinstruments.com ARNINGS To avoid electric shock or fire hazard, do not operate this product Avoid Electric Shock with the covers removed. Do not connect or disconnect any cable, probes, test leads, etc. while they are connected to a voltage source. Remove all power and unplug unit before performing any service.

  • Page 11: Support Resources

    VTI Instruments Corp. UPPORT ESOURCES Support resources for this product are available on the Internet and at VTI Instruments customer support centers. VTI Instruments Corp. World Headquarters VTI Instruments Corp. 2031 Main Street Irvine, CA 92614-6509 Phone: (949) 955-1894 Fax: (949) 955-3041...

  • Page 12: Section 1

    www.vtiinstruments.com ECTION NTRODUCTION EATURES High-density Switch Subsystem with Scanning Measure and Control The EX1200A systems are the highest density scanning switch/measure and control subsystem on the market today with the capacity to switch up to 576 channels of voltage or temperature in a 1U mainframe.
  • Page 13 VTI Instruments Corp. More than Switch and Measure EX1200As include a wide range of modules that can be used to create a stimulus/response test subsystem. Analog output modules can be used as part of the test sequence to generate waveforms or set control levels and can be synchronized with measurement inputs.
  • Page 14 www.vtiinstruments.com EXLab - Setup and Run EX1200As are supported by the popular EXLab turnkey software package. It allows end users to quickly setup a data-logging test scenario and begin collecting data within minutes. The EXLab intuitive GUI significantly shortens the time-consuming tasks of test setup and configuration – from setting channel configurations and display routines, to creating and exporting data files.

  • Page 15: Ex1200A System Specifications

    VTI Instruments Corp. EX1200A S YSTEM PECIFICATIONS ENERAL PECIFICATIONS ODULE LOTS 1 U Mainframes EX1202A Two standard plug-in module (PIM) slots Six standard PIM slots EX1206A 3 U Mainframes Sixteen standard PIM slots EX1208A IMENSIONS 1 U Mainframes Embedded, ½ rack U mainframe (17.22” D, 8.61” W, 1.75” H) EX1202A Embedded, 1 rack U mainframe (17.22”...
  • Page 16 www.vtiinstruments.com OWER PECIFICATIONS ONTINUED NPUT OWER ATING 230 VA EX1202A/EX1206A EX1208A 1380 VA OLTAGE 90 V to 250 V REQUENCY Manually set to 50 Hz or 60 Hz (default) LXI S PECIFICATIONS LXI C OMPLIANCE LXI Version 1.4 Specification with Extended functions LXI Wired Trigger Bus, LXI Event Messaging, LXI Clock Synchronization, LXI Timestamped Data, LXI Event Logs Minimum...

  • Page 17: Ex1200A Series 1 U, Full Rack Mainframe Dimensional Diagram

    VTI Instruments Corp. EX1200A S 1 U, F ERIES AINFRAME IMENSIONAL IAGRAM EX1200A Series Introduction...

  • Page 18: Ex1200A Series 3 U Mainframe Dimensional Diagram

    www.vtiinstruments.com EX1200A S 3 U M ERIES AINFRAME IMENSIONAL IAGRAM EX1200A Series Introduction...

  • Page 19: Ex1200A Series Dmm Specifications

    VTI Instruments Corp. EX1200A S DMM S ERIES PECIFICATIONS ENERAL PECIFICATIONS ODEL 6.5 Digit DMM for use with EX1206A EX1200-2165 EX1200-2365 6.5 Digit DMM for use with EX1208A EASUREMENT UNCTIONS DC voltage (DCV), true rms AC voltage (ACV) DC current (DCI), true rms AC current (ACI)
  • Page 20 www.vtiinstruments.com ESOLUTION (PLC) 60 H 50 H NTEGRATION PERTURE PERTURE ESOLUTION 167 ms 200 ms 6 ½ digits 16.7 ms 20 ms 5 ½ digits 1.67 ms 2 ms 4 ½ digits < 0.01 0.167 ms 0.2 ms 3 ½ digits Aperture Time is programmable from 100 µs to 2 s PLC = Aperture Time * Line Frequency The driver only supports settings that correspond to 10 PLC, 1.0 PLC, 0.1 PLC, and 0.01PLC...
  • Page 21 VTI Instruments Corp. – 1 Y ESISTANCE CCURACY  5 °C 0 °C +55 °C ANGE ESOLUTION < 30% R > 30% R URRENTS EADING ANGE ANGE ANGE  0.60 Ω  0.75 Ω 100 Ω, 6 ½ digit 100 µΩ...
  • Page 22 www.vtiinstruments.com HUNT ESISTANCE (ACI & DCI) URRENT ANGE 68.1 Ω 1 mA (DCI only) 4.1 Ω 10 mA & 100 mA 0.1 Ω 1 A & 3 A DCV, DCI, 2W-R, 4W-R R EADING DC C NTEGRATION EADINGS ECOND ORMAL OISE OMMON IGITS...
  • Page 23 VTI Instruments Corp. – 5 ½ D – 1 Y AC V OLTAGE IGITS CCURACY 0 °C +55 °C REQUENCY ANGE ESOLUTION ANGE EADING CCURACY EADING CCURACY 20 Hz - 45 Hz 378 µV 2.28 mV >45 Hz - 100 Hz 198 µV...
  • Page 24 www.vtiinstruments.com – 6 ½ D – 1 Y AC C URRENT IGITS CCURACY  5 °C 0 °C +55 °C REQUENCY ANGE ESOLUTION < 30% R > 30% R ANGE ANGE ANGE EADING ANGE  200 µA  200 µA 0.6000% 0.0350% 20 Hz - 45 Hz...
  • Page 25 VTI Instruments Corp. AC F ILTER ILTER ANDWIDTH ELECTION LOW* 3 Hz - 300 kHz Can be selected only in 6½ Digits 20 Hz - 300 kHz Can be selected only in 6½ Digits MEDIUM* HIGH 20 Hz - 300 kHz Can be selected in 6½, 5½, and 4½...

  • Page 26: Dmm Removal/Replacement

    www.vtiinstruments.com YSTEM PEED Max. reading rate* 2000/s (see DC Voltage Reading Rates tables below) 2000/s Max. internal trigger rate* Max. Ext. trig. rate to memory* 2000/s * Auto-zero off, trigger and sample delay = 0, 0.01 PLC ONNECTOR NFORMATION 5 banana jacks Connector pin locations and signals can be found in Figure 4-1.
  • Page 27 VTI Instruments Corp. 1-1: EX1200-2165 DMM IGURE NOTE The mainframe can continue to be used once the DMM has been removed. Installation Procedure 1) Using the guides shown in , slide the DMM into the mainframe unit until the DMM is supported by the card guides.
  • Page 28 www.vtiinstruments.com 1-2: EX1200-2365 DMM IGURE NOTE Once the DMM is removed from the mainframe, the chassis can no longer be used. Installation Procedure 1) Using the guides shown in , slide the DMM into the mainframe unit the until DMM is supported by the card guides.

  • Page 29: Explanation Of Specifications

    VTI Instruments Corp. XPLANATION OF PECIFICATIONS This section provides explanatory notes for EX1200A DMM specifications that may be misunderstood. Memory This is the internal FIFO/buffer memory of the EX1200A mainframe. This does not include any buffer memory that the individual plug-in cards may have. Some plug-in cards, such as the EX1200-7500, EX1200-3608, and EX1200-7416, have onboard buffers that allow them to perform high-speed operations.
  • Page 30 www.vtiinstruments.com Crest Factor Although the EX1200A DMM is a true RMS ac multimeter, calibration and all other accuracy specifications are applicable only to sinusoidal waveforms. If the input waveform is non- sinusoidal, it will affect the accuracy of the reading. It is important to consider the crest factor of the input waveforms to determine the percent error contributed by them.

  • Page 31: Maximizing Measurement Performance

    VTI Instruments Corp. AXIMIZING EASUREMENT ERFORMANCE This section discusses tips and procedures that can help maximize the actual performance realized with the EX1200A DMM and aid the user in avoiding some common pitfalls associated with making measurements. Warm-up Time For the most accurate DMM measurements, the EX1200A should be warmed up for 30 minutes.
  • Page 32 www.vtiinstruments.com Low-Resistance Measurements When making low-resistance measurements and using switch cards, it is important the type of relay being used by the switch card. Solid-state relays tend to have a higher input impedance and more capacitance than mechanical relays, making mechanical relays preferable when performing measurements of this type.

  • Page 34: Section 2

    VTEX Scanner Driver Programmer’s Manual (P/N: 82-0128-000)  VTEX System Driver Programmer’s Manual (P/N: 82-0125-000)  VTI Instruments Corp. Drivers and Product Manuals CD  Power line cord All components should be immediately inspected for damage upon receipt of the unit.

  • Page 35: Warm-Up Time

    VTI Instruments Corp. 3) All unused slots should be closed with blanking panels to ensure a proper air circulation. This is critical to avoid overheating of the cards. For more information, see the Blanking Panel description in this section. 4) The front panel of an EX1200A should not be exposed to strong air currents. Typical problematic sources include building ventilation and instrument or cabinet fans.

  • Page 36: Removing Plug-In Modules

    www.vtiinstruments.com EMOVING ODULES An extractor handle (P/N: 41-0472-058) is provided is with all EX1200A mainframes to assist with removal of the module after installation. To remove a module, ensure that the captive screws have been removed from the EX1200A mainframe. Next, insert the insertion screw between the head of the screw and the front panel for the plug-in module, as shown in Figure 2-2.
  • Page 37 VTI Instruments Corp. 4) Using the #2 Phillips screw driver, install the four rubber feet using four (4) 6-32 x 7/16” pan head Phillips screws to secure the top and bottom and one (1) 6-32 x 1/2” pan head Phillips screw to secure side of each foot.
  • Page 38 www.vtiinstruments.com Rack Ears, Half Rack Width Option (P/N: 70-0373-101) The tabletop installation option can be used when an EX1202A is not installed in a rack, but will be employed as a bench top or desktop instrument. Required Tools 1) #2 Phillips screwdriver Parts List Item# Description...
  • Page 39 VTI Instruments Corp. Rack Ears, Dual Half Rack Width Option (P/N: 70-0373-102) The rackmount installation option includes all the parts necessary to mount an EX1202A system to the front of a standard test rack. Required Tools 1) #2 Phillips screwdriver...
  • Page 40 www.vtiinstruments.com 2-5: D IGURE NSTALLATION IAGRAM XPLODED RONT EX1200A Series Preparation for Use...
  • Page 41 VTI Instruments Corp. Rackmount Installation, Half Rack Width Option (P/N: 70-0373-103) The rackmount installation option includes all the parts necessary to mount an EX1202A to the front and rear of a standard test rack. Required Tools 1) #2 Phillips screwdriver 2) 5/16”...
  • Page 42 www.vtiinstruments.com 2-6: H IGURE IDTH ACKMOUNT NSTALLATION IAGRAM XPLODED RONT EX1200A Series Preparation for Use...
  • Page 43 VTI Instruments Corp. Rackmount Installation, Dual Half Rack Width Option (P/N: 70-0373-104) The rackmount installation option includes all the parts necessary to mount an EX1202A to the front and rear of a standard test rack. Required Tools 1) #2 Phillips screwdriver 2) 5/16”...
  • Page 44 www.vtiinstruments.com 2-7: D IGURE NSTALLATION IAGRAM XPLODED RONT EX1200A Series Preparation for Use...

  • Page 45: Ex1206A Mainframe Installation Options

    VTI Instruments Corp. EX1206A M AINFRAME NSTALLATION PTIONS EX1206A has three options which can installed prior to installation:  Tabletop Installation Option (P/N: 70-0361-100)  Rack Ear Installation Option (P/N: 70-0361-101)  Rackmount Installation Option (P/N: 70-0361-102) NOTE These options are not included with the EX1206A system and must be ordered separately.
  • Page 46 www.vtiinstruments.com 2-8: T IGURE ABLE NSTALLATION IAGRAM XPLODED RONT EX1200A Series Preparation for Use...
  • Page 47 VTI Instruments Corp. Rack Ear Installation Option (P/N: 70-0361-101) The rackmount installation option includes all the parts necessary to mount an EX1206A system to the front of a standard test rack. Required Tools 1) #2 Phillips screwdriver Parts List Item#...
  • Page 48 www.vtiinstruments.com Rackmount Installation Option (P/N: 70-0361-102) The rackmount installation option includes all the parts necessary to mount an EX1206A to the front and rear of a standard test rack. Required Tools 1) #2 Phillips screwdriver 2) 5/16” wrench or socket Parts List Item# Description...
  • Page 49 VTI Instruments Corp. 2-10: R IGURE ACKMOUNT ARDWARE NSTALLATION IAGRAM XPLODED RONT EX1200A Series Preparation for Use...

  • Page 50: Mainframe Installation Options

    www.vtiinstruments.com 3U M AINFRAME NSTALLATION PTIONS EX1208As have three options which can installed prior to installation:  Tabletop Installation Option (P/N: 70-0370-100)  Rack Ear Installation Option (P/N: 70-0370-101)  Rackmount Installation Option (P/N: 70-0370-102) NOTE These options are not included with the EX1208A system and must be ordered separately. Tabletop Installation Option (P/N: 70-0370-100) The tabletop installation option can be used when an EX1208A is not installed in a rack, but will be employed as a bench top or desktop instrument.
  • Page 51 VTI Instruments Corp. EX1200A Series Preparation for Use...
  • Page 52 www.vtiinstruments.com 2-11: T IGURE ABLE NSTALLATION IAGRAM XPLODED RONT EX1200A Series Preparation for Use...
  • Page 53 VTI Instruments Corp. Rack Ear Installation Option (P/N: 70-0370-101) The rackmount installation option includes all the parts necessary to mount an EX1208A system to the front of a standard test rack. Required Tools 1) #2 Phillips screwdriver Parts List Item#...
  • Page 54 www.vtiinstruments.com Rackmount Installation Option (P/N: 70-0370-102) The rackmount installation option includes all the parts necessary to mount an EX1208A to the front and rear of a standard test rack. Required Tools 1) #2 Phillips screwdriver 2) 5/16” wrench or socket Parts List Item# Description...

  • Page 55: Blanking Panel

    VTI Instruments Corp. 2-13: R IGURE ACKMOUNT ARDWARE NSTALLATION IAGRAM XPLODED RONT LANKING ANEL When a chassis is not fully populated, blanking panels (P/N: 41-0472-012) should be installed into the empty slots to maintain proper air flow through the chassis. Blanking panels should be ordered with the mainframe if empty slots are anticipated.

  • Page 56: Driver Installation

    An executable for installing JRE is available on the VTI Instruments Corp. Drivers and Product Manuals CD provided with the EX1200A. If JRE is currently installed on the host PC, the software installation instruction for this software can be skipped.

  • Page 57: Network Troubleshooting

    VTI Instruments Corp. Auto IP is a mechanism for finding an unused IP address in the range 169.254.X.Y where X is in the range 1 - 254 and Y is in the range 0 - 255. The device will first attempt to obtain the specific address 169.254.X.Y, where X and Y are the second-to-last and last octets of the device’s MAC...
  • Page 58 www.vtiinstruments.com 2) Press and hold the reset button until the LAN LED flashes green (approximately 5 s). 3) Release the reset button. Determine PCs Network Settings 1) Ensure that all host PC Ethernet connections are made that will be used while controlling the EX1200A.
  • Page 59 VTI Instruments Corp. 2-16: D ) IP A IGURE YNAMIC TATIC IGHT DDRESS ONFIGURATIONS 6) If set to use a static IP, record the IP address, subnet mask, and default gateway for use later. Select Obtain an IP address automatically to establish a connection to the EX1200A. Click the OK button and proceed to Set the EX1200A to Static IP.
  • Page 60 www.vtiinstruments.com 2-17: EX1200A S IGURE ET TO Set the EX1200A to Static IP 1) Disconnect all network connections from the PC except for the connection between the PC and the EX1200A. 2) Apply power to the EX1200A and wait for the LAN LED to turn green. 3) Discover EX1200A using LXI Discovery Tool as described in the Web Page Operation in Section 7.
  • Page 61 VTI Instruments Corp. 2-18: EX1200A S IGURE ET TO TATIC Restore the Host PCs Network Settings 1) Power down the EX1200A and reconnect it to the LAN in its desired location. 2) If the PC was originally set to use a static IP address, use the procedure in Determine PCs Network Settings to change the PCs IP address back to its original state.
  • Page 62 www.vtiinstruments.com 2-19: C EX1200A M IP C IGURE OMPLETED AINFRAME TATIC ONFIGURATION 8) Click the Submit button. Once this is done, it is no longer possible to communication with the EX1200A mainframe. This is normal and is addressed in the following steps. 9) Set a static IP address for the NIC card by doing the following: a) Navigate to Start →...

  • Page 63: Time Configuration

    VTI Instruments Corp. d) Click the Use the following IP address radio button. e) Enter the desired IP address. If using the IP from the example above, 192.168.1.1 can be used. If not automatically completed after the IP address is entered, set the Subnet mask field to 255.255.255.0.
  • Page 64 www.vtiinstruments.com EX1200A Series Preparation for Use...

  • Page 66: Section 3

    www.vtiinstruments.com ECTION ASIC AINFRAME PERATION NPUT ONNECTIONS This section describes the connectors that are available on the EX1200A mainframe. Tables are provided to indicate the pin mapping used for these connectors and a brief description of the connectors functionality is provided as well. Ethernet Connector EX1200As use a 10/100BaseTX RJ-45 connector to connect to PCs, LANs, and other networking devices.
  • Page 67 VTI Instruments Corp. When enabled as an output, each channel also has the ability to generate a 1 µs pulse upon command. An example application of this pulse is to use the EX1200A to externally trigger another piece of test equipment. The specific operation of the pulse depends on the static level programmed for that channel.
  • Page 68 Since the two connectors per unit are in parallel, they are electrically equivalent with respect to receiving the cable or termination. VTI Instruments P/N: 70-0322-000 provides two termination assemblies, which is sufficient to connect any number of instruments, since a termination is only needed at each end.
  • Page 69 VTI Instruments Corp. 3-1: T IGURE RIGGER ABLING XAMPLE As a general purpose output device, each Trigger Bus channel can be independently programmed with regards to its output functionality and its static level to assume when enabled as an output.
  • Page 70 www.vtiinstruments.com In addition to a single-master/multiple-slaves configuration, the Trigger Bus can be configured in Wired-OR mode. This mode allows multiple instruments to bring an LXI Trigger Bus channel to a “1” state. The channel will only go back to “0” when all instruments have released it. This is useful if multiple instruments in parallel operation must all complete before another instrument can begin its operations.

  • Page 71: Dmm Bus

    VTI Instruments Corp. Device Reset Mode Depressing the button for a longer time (greater than 1 s but less than or equal to 10 s) causes the EX1200A to reset in the same manner as clicking the Reset button on the browser interface. All switch modules, for instance, will move their switches to the predefined “reset”...

  • Page 72: Led Indicators

    www.vtiinstruments.com LED I NDICATORS The EX1200A has three dual-color status LEDs. The 1588 LED indicates IEEE 1588 synchronization status, the LAN LED indicates the LAN status, and the PWR LED provides power and failure status for the EX1200A system. The different LEDs states are illustrated in Table 3-7.

  • Page 74: Section 4

    www.vtiinstruments.com ECTION EX1200A DMM O ASIC PERATION VERVIEW The EX1200A series mainframes can be configured to include an onboard DMM (please refer to EX1200A Series DMM Specifications for details regarding functions, ranges, and accuracy) depending on the model purchased. These DMMs are the EX1200-2165 (for the EX1206A) and the EX1200-2365 (for the EX1208A) The functionality of these DMMs is identical and, as such, they are referred to as the EX1200A DMMs throughout this section.

  • Page 75: Dmm Input Connections

    VTI Instruments Corp. DMM I NPUT ONNECTIONS Front Panel Connector The EX1200A DMM’s hardware interface is made available on the front panel of the instrument. The DMM front panel has the following features: five banana jack inputs, a fuse, and three status...
  • Page 76 www.vtiinstruments.com LED Indicators section of Section 3). 4-1: I IGURE NPUT OCATIONS AND IGNALS Standard banana plugs can be used to interface other external instruments with the DMM. The fuse located on the front panel is for current input protection and is user-replaceable. It is a 3.15 A, 250 V fuse and can be replaced with VTI P/N: 35-0054-315.
  • Page 77 VTI Instruments Corp. Function Front Panel Equivalent +SHI Sense HI +DAMPS Input I -SLO Sense LO GUARD (Ground Stud on Rear Panel) 4-1: DMM B I/O P ABLE IGNALS Using the DMM Bus with Switch Cards Some switch cards and plug-in instruments can access the EX1200A DMM without external wiring as they can connect across the backplane to the DMM bus.

  • Page 78: Dmm Measurement Basics

    www.vtiinstruments.com DMM M EASUREMENT ASICS When making a measurement, the following sequence should be followed:  Select an Input Connector  Configure the Measurement  Configure Triggering  Take the Measurement  Retrieve the Data These steps are discussed in detail in the following sections for IVI-COM. ELECT AN NPUT ONNECTOR...

  • Page 79: Configure The Measurement

    VTI Instruments Corp. ONFIGURE THE EASUREMENT A simple DMM measurement can be configured by setting the function, range, and resolution. There are many other parameters that may need to be configured depending on the type of measurement being performed. This is explained in detail in later sections.
  • Page 80 www.vtiinstruments.com  Sample Trigger Options Sample Trigger Source: sets the trigger line that moves the DMM from the Wait-For- Sample state to the Take Measurement state. Sample Trigger Slope: indicates whether a rising or falling edge will move the DMM from the Wait-For-Sample state to the Take Measurement state.

  • Page 81: Take The Measurement

    VTI Instruments Corp. IVI-COM Programming Interface The IVTEXDMM.Trigger interface provides properties and methods for setting the input trigger. The IVTEXDMM.Trigger.Multipoint interface provides properties and methods for setting the sample trigger and setting the measurement complete output trigger. AKE THE EASUREMENT Once the DMM has been configured, the measurement must next be initiated.

  • Page 82: Dmm Functions

    www.vtiinstruments.com DMM F UNCTIONS This section of the manual discusses each measurement function of DMM and aids in understanding some of the DMM specifications. Understanding the operation of the DMM and each of its functions helps optimize the configuration of the DMM for measurement accuracy/speed.

  • Page 83: Resolution

    VTI Instruments Corp. For example, if a 9 V signal is fed to the DMM and auto-range is enabled, the 10 V range is selected in order to display 9.00000 V (the total number of digits is based on the resolution selected).

  • Page 84: Integration/Aperture Time

    www.vtiinstruments.com X = Resolution/Range Where Range =100V if userRange=300V, =1A if userRange=3A, = userRange otherwise if (X <= 1e-6) numberOfPLC=10; else if (X <= 1e-5) numberOfPLC=1; else if (X <= 1e-4) {// 4.5 digits numberOfPLC=0.1; else {// 3.5 digits numberOfPLC=0.01; apertureTime=numberOfPLC/PowerLineFrequency;...

  • Page 85: Limits

    VTI Instruments Corp. Auto Zero Off The auto-zero function can be disabled programmatically to achieve higher measurement speeds. Once the auto-zero is disabled, the DMM no longer takes the new zero and reference measurements, but, instead, uses the last known zero and reference values to calculate the signal level.

  • Page 86: Dc Voltage Measurements

    www.vtiinstruments.com DC V OLTAGE EASUREMENTS DC voltage (DCV) measurements are one of the simplest measurements to take with a DMM. The DMM measures the average voltage value of the connected signal differentially. This means that floating signals can be measured as well as signals containing large common mode voltage offsets (refer to the EX1200A Series DMM Specifications for maximum signal details).
  • Page 87 VTI Instruments Corp. When using switch multiplexer modules such as the EX1200-3048, each input channel pair (HI and LO) is routed through relays which are close to one another on the PCB to maintain the same average temperature. Because of this proximity, the relays generate approximately equal thermoelectric voltages on both the HI and LO channels, making the differential reading across these two switches approximately cancel the thermoelectric voltages.
  • Page 88 www.vtiinstruments.com Power Line Noise Rejection An intrinsic characteristic of integrating ADCs is their ability to reject spurious signals. When the PLCs is set to an integer value, the integrating technique rejects power-line related noise present with a dc signal on the input. This is called normal mode rejection, or NMR. (Note that common mode rejection is with a voltage being common to both input terminals, while NMR is with an ac voltage between the two input terminals).

  • Page 89: Ac Voltage Measurements

    VTI Instruments Corp. Noise Caused by Ground Loops When measuring voltages in circuits where the DMM and the DUT are referenced to a common earth ground, but at different points, a “ground loop” is formed. As shown in Figure 4-8, any...
  • Page 90 www.vtiinstruments.com NOTE Although the DMM can measure up to 300 V rms (200 V from LO or Sense LO to Guard), this may exceed the maximum switching value of the plug-in module installed in the system. Ensure that voltage, current, and power specification for the plug-in modules are not exceeded when measurements are taken.
  • Page 91 VTI Instruments Corp. Waveform Example Crest Factor Sine 1.414 Full-wave Rectified Sine 1.414 Half-wave Rectified Sine Triangle 1.732 Square Wave (Symmetrical) Repeating Pulse (PWM) 4-10: C IGURE REST ACTORS FOR OMMON AVEFORMS Crest factor related errors are specified in the DMM specifications on page Error! Bookmark not defined..

  • Page 92: Dc And Ac Current Measurements

    www.vtiinstruments.com Low-Level AC Voltages and Shielding When measuring ac voltages less than 100 mV, be aware that these measurements are especially susceptible to errors introduced by external noise sources. Exposed (unshielded) cabling acts as an antenna and the EX1200A DMM will measure the signals received. The entire measurement path, including the power line, acts as a loop antenna.

  • Page 93: Resistance Measurements

    VTI Instruments Corp. measurements with motors and other devices with a high starting current, be certain that the current rush does exceed the fuse’s rating. The shunt resistance value applicable for each current range varies, making the selection of the proper range crucial for DMM safety.
  • Page 94 www.vtiinstruments.com Minimizing Lead Wire Resistance Errors While the best way to minimize lead wire resistance is to use the 4-wire method, this may not be practical for all applications, especially when the wiring density is high. When 4-wire measurements are impractical, the user can offset the lead resistance of the 2-wire resistance to obtain a more accurate value.

  • Page 95: Frequency/Period Measurements

    VTI Instruments Corp. Common Error Sources The errors discussed previously for DC Voltage Measurements also apply to resistance measurements. Additional error sources unique to resistance measurements are discussed below. Self-Heating Error When a current passes through a resistor, heat is generated in the resistance source. This is unavoidable.
  • Page 96 www.vtiinstruments.com The resolution of frequency measurements is set from one of the following options: Slow Mode, Medium Mode, Fast Mode, and User Mode. Table shows the settings used for each mode. Mode Digits Aperture/Gate Time Slow 6½ 140 ms 5½ 14 ms Medium 4½...

  • Page 97: Temperature Measurements

    VTI Instruments Corp. Connecting a frequency signal via the EX1200A DMM bus requires a making connections similar to those used for voltage measurements. DMM Backplane Frequency Sources CH 1 CH 2 CH n EX1200 Multiplexer Cards EX1200 Mainframe 4-9: F...
  • Page 98 www.vtiinstruments.com Digits The resolution, or number of digits, can be set for temperature measurements. Either 3½, 4½, 5½, or 6½ digits can be selected. Resolution should be optimized based on application and required results. While lower resolution yields faster sampling rates, it also decreases the accuracy of the reading.
  • Page 99 VTI Instruments Corp. provided by the EX1200A series terminal blocks provide less accuracy than a fixed reference, it does provide the advantage of requiring no external wiring and simplifying test setup. Note that the fixed reference is supported using the EX1200A DMM. To use external reference, the scanner driver must be used.
  • Page 100 www.vtiinstruments.com = nominal resistance of RTD (resistance at 0 °C) T = temperature in °C A = α[1+ (δ/100)] B = -αδ/1 x 10 C = -αβ/1 x 10 For the RTD’s with built-in support, the following Callendar-Van Dusen RTD parameters are used: α...
  • Page 101 VTI Instruments Corp. DMM Backplane RTDs CH 1 CH 2 CH n EX1200 Multiplexer Cards EX1200 Mainframe 4-16: RTD 2-W EX1200A DMM B IGURE ONNECTION VIA THE 4-Wire Measurement Connections The 4-wire RTD measurement method is the most accurate method of the two methods, as the set up automatically removes connection lead and switch resistance.
  • Page 102 www.vtiinstruments.com DMM Backplane CH1_1 CH2_1 EX1200-3048 EX1200 Mainframe 4-19: RTD 4-W EX1200A DMM B IGURE ONNECTION VIA THE Programming Interface The VTEX DMM and VTEX Scanner drivers provide the access to the features of EX1200A DMM. Refer to the below functions of the driver in its documentation. IVTEXDmmTemperature Interface IIviDmmTemperature..::.RTD Property Using a Thermistor...
  • Page 103 VTI Instruments Corp. Curve fitting constants used by the DMM for supported thermistor types: 2252 Ω at 25 °C 5000 Ω at 25 °C 10 kΩ at 25 °C Constant (Series 44004) (Series 44007) (Series 44006) 0.0014733 0.0012880 0.0010295 0.0002372 0.0002356...
  • Page 104 www.vtiinstruments.com If the thermistors are connected to a multiplexer card, the wiring is similar to that of a 2-wire voltage measurement without the polarity constraints, as the thermistors are bilateral passive devices. DMM Backplane Thermsitors CH 1 CH 2 CH n EX1200 Multiplexer Cards EX1200 Mainframe...

  • Page 105: Self-Test

    VTI Instruments Corp. The EX1200A DMM self-test performs various hardware checks to ensure that the DMM is functioning properly. The process is takes approximately two minutes to complete and checks the following:  Communication lines for the controller board, digital FPGA, and analog FPGA.

  • Page 106: Section 5

    www.vtiinstruments.com ECTION CANNER VERVIEW VERVIEW The purpose of the VTEXScanner driver is to make it easy to control any VTI instrument where taking measurements on multiple modules is the primary purpose of the device. While controlling the instrument in the same way is possible by using a combination of other VTI drivers, this is often cumbersome due to the need to instantiate and initialize multiple drivers, and arrange scanlists and triggers exactly.
  • Page 107 VTI Instruments Corp. EX1200A Triggering...

  • Page 108: Section 6

    www.vtiinstruments.com ECTION RIGGERING VERVIEW The EX1200A is a bridge device and, therefore, does not expose a triggerable action. However, for ease of use, the scanner driver exposes a trigger model which functions like the SCPI 1999 Trigger Subsystem and works on the device and all installed plug-in cards. The user should be able to program to this representation except where otherwise noted.
  • Page 109 VTI Instruments Corp. 6-1: EX1200A S IGURE ERIES RIGGER ODEL EX1200A Triggering...

  • Page 110: Section 7

    Programs → LXI Discovery Tool. Once the utility is run, LXI Discovery Tool will scan the network to discover all LAN-based VTI instruments. Once the scan is complete, the tool shows all the instruments that were discovered, as shown in Figure 7-1. To open the web page, click on the Open Web Page.

  • Page 111: General Web

    VTI Instruments Corp. ENERAL PERATION When initial connection is made to the EX1200A, the instrument home page, Index, appears (see Figure 7-2). This page displays instrument-specific information including:  Model  Manufacturer  Serial Number  Description  LXI Class ...

  • Page 112: Soft Front Panel Main Page

    Submit button and cannot be used for navigation. VTI Instruments Logo The VTI Instruments logo that appears on the upper left of all EX1200A web pages is a link to the VTI Instruments corporate website: http://www.vtiinstruments.com.

  • Page 113: Scanner Soft Front Panel

    VTI Instruments Corp. Once a soft front panel is selected, a popup will appear displaying the appropriate information. When the current SFP is no longer needed, simply click on the grey “X” in the upper right corner to close the SFP and return to the main Soft Front Panel page.
  • Page 114 www.vtiinstruments.com  Slot x: One Slot tab will appear for each switch/instrument installed in the EX1200A system. This provides the ability to monitor the state of the relays or control them directly. When a plug-in card is initially accessed from the Tab bar, the switch’s SFP appears in Monitor Only mode.
  • Page 115 VTI Instruments Corp. Scanlist Field The Scanlist field allows for the creation of a list which can be sequentially executed once the Scan and Step Trigger requirements have been met. Each scan step consists of two phases: the setup phase and the sweep phase. The setup phase consists of general purpose switching and setup, where the sweep phase performs measurements on its defined channels.
  • Page 116 www.vtiinstruments.com  Connect/Disconnect: This button toggles between Connect and Disconnect. When Connect is selected, the path defined to the right of the button will be made. Choosing Disconnect will open the defined path.  A → B Drop Menus: From these menus, the input and output of each required path can be defined.
  • Page 117 VTI Instruments Corp.  Break Before Make checkbox: When selected, the scanner ensures that channel selected has completely settled before it connects to another channel. Deselecting this option increases scan speed, but introduces the of input channels potentially being shorted to each other for a short time.
  • Page 118 www.vtiinstruments.com  Trigger Delay: indicates the delay, in seconds, that occurs between connecting a switch channel to the DMM and when the measurement is taken. Valid values are 0 s to 4294.967295 s. An option to select Auto appears when this field is selected. Auto delay allows the DMM to automatically set the trigger delay based on the measurement configuration.
  • Page 119 VTI Instruments Corp. If a hardware trigger (an LXI, LAN, or DIO line) is selected as either the Scan Trigger or Step Trigger source, and the Rise/Fall slider will appear. This slider allows the user to choose which edge polarity will be accepted as the arm or trigger source or which will be asserted as a trigger output.

  • Page 120: Instrument Soft Front Panels

    www.vtiinstruments.com  Scan Delay: Indicates the minimum time to complete each scan step. For instance, if this is set to 1.0 and a scan step completes in only 0.75 seconds, the scanner waits another 0.25 seconds before advancing to the next step. ...
  • Page 121 VTI Instruments Corp. size of the schematic can be changed from to any of the following sizes: Tiny, Small (default), Medium, and Large. 7-11: T IGURE YPICAL WITCH RONT ANEL For switches that support read-back, the relays are color coded to provide the user an indication of the relay states.
  • Page 122 www.vtiinstruments.com  Saved States button: This button allows the user to either save, load, or erase a switch configuration. Saving a state allows the user to use the same switch set up at a later time. When the Save button is clicked, a prompt will appear. The user selects a number, 0 through 127, from this field.

  • Page 123: Dmm Soft Front Panel

    VTI Instruments Corp. DMM S RONT ANEL The DMM Soft Front Panel provides an interface for the user to configure and perform measurements with an EX1200A DMM. Note that this option is only available on EX1200A systems where the DMM is installed.
  • Page 124 www.vtiinstruments.com System Buttons To the right of the Status Display are two system buttons that affect the functionality of the EX1200A system and all installed modules.  Lock/Unlock: Requests (or releases) exclusive access to the EX1200A system.  Reset: Resets the SFP and the connected modules to power-on defaults. ...
  • Page 125 VTI Instruments Corp.  Digits: Indicates the number of significant digits that will be used when measurements are taken. Note that this property and Aperture Time are interrelated hardware settings. Thus, changing one affects the other. Optional Settings Some functions require optional settings. These settings are displayed only if a function requiring them is selected.
  • Page 126 www.vtiinstruments.com Delay: Indicates the time, in seconds, the DMM will wait after getting a trigger input event before proceeding to the Sample Trigger layer. Valid values are -1.0 and 0 to 4294.967295. When set to -1.0 this is equivalent to using Auto Delay. ...
  • Page 127 VTI Instruments Corp.  Range Delay: The amount of time the DMM takes between measurements on the same function, but on different ranges. Auto checkbox: When selected, the auto range function is enabled. Delay (sec): Sets the range delay. Valid values are between 0 and 4294.967295 s.

  • Page 128: Dmm Calibration Web Page

    www.vtiinstruments.com The following control options are provided:  Get Continuous checkbox: If enabled, this button disables the Get button and continually populates the data table as data is acquired.  Get button: When clicked, data is immediately pulled from FIFO memory. ...
  • Page 129 VTI Instruments Corp.  Function sliders: The sliders provided in the Calibration Functions field allow to user to perform a full calibration/verification or to perform calibration/verification on a subset of the DMM’s functions. All: Calibration/verification of all functions will be performed when selected. Also causes all sliders to move to the ON position.
  • Page 130 www.vtiinstruments.com Temperature Field The Temperature field provides the internal and external temperature during calibration.  Internal: Displays the current internal temperature of the DMM.  External: The current ambient temperature should be entered here when a calibration or verification procedure is started. Calibration Status Field The Calibration Status field provides an indication of how close calibration is to completion.

  • Page 131: Network Configuration

    VTI Instruments Corp. ETWORK ONFIGURATION The EX1200A Network Configuration page can be seen in Figure 7-15. By default, the EX1200A will attempt to locate a DHCP server. If one is found, the IP address assigned by the DHCP server will be assumed, along with subnet masks, gateway, etc. Otherwise, after a timeout of 20 seconds, the unit will attempt to obtain an IP address by using Auto IP (IPv4 Dynamic Link Local Addressing).

  • Page 132: Time Configuration

    www.vtiinstruments.com 7-15: EX1200A N IGURE ETWORK ONFIGURATION NOTE If problems are experienced connecting to the EX1200A, please refer to the Network Troubleshooting process in Section 2. ONFIGURATION This entry page is used to change the time configuration of the EX1200A. As the EX1200A has no notion of “wall clock”...
  • Page 133 VTI Instruments Corp. If a PTP master clock does not exist on the network, an LXI device on the network will begin serving as the PTP time master. The Time Configuration page allows for PTP time to be set manually. From the Time Configuration page, select the Set Time checkbox, then select the Grandmaster radio button from the Target field, and then configure the time by hand.

  • Page 134: Lxi Synchronization

    www.vtiinstruments.com 7-17: SNTP C IGURE ONFIGURATION Using the Manual Time Setting If a PTP master or an SNTP server is not available, time can be configured manually by the user by selecting Manual in the Time Source drop menu. Note, manually set time sources are not very accurate and that this configuration should only be used if timestamp accuracy is not vital to a measurement.
  • Page 135 VTI Instruments Corp. 7-18: LXI S IGURE YNCHRONIZATION  IEEE 1588 Parameters PTP Grandmaster Clock MAC: indicates the MAC address of the device on the network to which all other IEEE 1588 compliant devices are synchronized. PTP Parent Clock MAC: indicates the MAC address of the device to which the EX1200A is synchronized.

  • Page 136: Lxi Identification

    www.vtiinstruments.com  LXI Module to Module Parameters LXI Domain: an 8-bit number, 0 to 255, that indicates the domain the EX1200A is using for LAN events. All events sent by this device will include this data. Likewise, the device will only accept events that include the same LXI Domain data. ...

  • Page 137: Blink Lan Indicator

    VTI Instruments Corp. LAN I LINK NDICATOR This action page is used to identify the EX1200A that is being commanded in the current session. When the Turn on button is pressed, the LAN LED located on the front panel of the EX1200A will blink.

  • Page 138: Upgrade

    (if installed) as well as the plug-in modules. Prior to initiating the firmware upgrade process, a new, uncompressed firmware image must be obtained from VTI Instruments and be accessible from the computer that is connected to the EX1200A. Unless specifically noted by VTI Instruments, firmware upgrades do not alter the non-volatile configuration settings (network configuration, time configuration) of the EX1200A.
  • Page 139 VTI Instruments Corp. 7-23: C DMM U IGURE OMPLETED ONTROLLER AND PGRADE During a plug-in module firmware upgrade, an Upgrade Status window similar to the one shown in Figure 7-24 appears. A step will appear for each plug-in module installed in the mainframe.
  • Page 140 www.vtiinstruments.com Remove Temporary Internet Files The initial steps of firmware upgrade involve preparing the host PC. The instructions that follow provide guidance for removing cookies from IE and clearing the cache retained by Java. Clearing Cookies from Internet Explorer 8 For Internet Explorer 8, the following steps can be taken to delete existing cookies (for other browsers, please refer to the browser’s on-line help documentation): 1) Open Internet Explorer.
  • Page 141 VTI Instruments Corp. Clearing Java Cache Once the cookies have been deleted from the host PC, the Java cache should be deleted next. For Java version 6, the cache can be removed by performing the following steps: 1) Navigate to the Control Panel (Start → Settings → Control Panel).
  • Page 142 www.vtiinstruments.com 4) When the Temporary Internet Files window opens, click the Delete Files… button. A confirmation dialog box will appear. Click to OK button delete the cache. EX1200A Web Page Operation...
  • Page 143 VTI Instruments Corp. EX1200A Web Page Operation...

  • Page 144: Section 8

    www.vtiinstruments.com ECTION ROGRAMMING ROGRAMMING EFERENCES EX1200A systems ship with several programmer’s guides that define APIs and provide practical examples which assist the programming with sequencing, syntax, and the use of other IVI- specified APIs. These guides include:  VTEXSwitch Programmer’s Manual (P/N: 82-0117-000) ...
  • Page 145 VTI Instruments Corp. EX1200A Series Programming...

  • Page 146: Maintenance

    www.vtiinstruments.com ECTION AINTENANCE EPLACEABLE The EX1200A DMM has a replaceable fuse located on its front panel for current input and is user- replaceable. It is a 3.15 A, 250 V fuse and can be replaced with VTI P/N: 35-0054-315. Alternatively, P/N: 2173.15XP from Littlefuse, Inc. may also be used as a replacement. CPU B (3U M OARD...
  • Page 147 VTI Instruments Corp. 9-1: CPU B IGURE OARD Installation Procedure 1) Using the guides shown in Figure 9-1, slide the CPU board into the mainframe unit the until DMM is supported by the card guides. 2) Slide the DMM into the mainframe using the card guides until the jack-out screws touch the front panel of the mainframe.

  • Page 148: Ex1200A Dmm Calibration /Verification

    A web browser (Internet Explorer, Firefox, etc.) with Java support Java Runtime Environment The latest version of EX1200A firmware, available on the VTI Instruments web site. Bonjour (optional: used to discover the EX1200A, requires use of IE Version 6 or higher)

  • Page 149: Connecting To The Ex1200A

    VTI Instruments Corp. Calibrator LAN/GPIB Gateway GPIB GPIB Port Cable GPIB Port LAN Port Interconnect Cable Ethernet GPIB Cable Ethernet Cable Switch Daisy Chain LAN Port Amplifier Ethernet GPIB Cable GPIB Port 8.5 Digit DMM Cable Daisy Chain LAN Port...

  • Page 150: Login Into Sfp

    www.vtiinstruments.com To use ACE, use the following steps: 1) Open ACE and click on the Add instrument toolbar. 2) Select Add LAN instrument on LAN and then click OK. ACE will search the network and list the LXI instruments connected to the LAN. 9-3: A IGURE NSTRUMENT...

  • Page 151: Time Configuration

    VTI Instruments Corp. ONFIGURATION When calibration is performed, the time and date of calibration is recorded, making it important to ensure that the EX1200A’s time is configured properly. To determine the time, click on the Time Configuration link in the command menu. If the time is displayed incorrectly, use the following steps to configure the time from the Time Configuration web page.
  • Page 152 www.vtiinstruments.com Calibration Procedure 1) Connect to the embedded web page. See Connecting to the EX1200A for assistance. 2) Click Soft Front Panel from the Index page to navigate to the Soft Front Panel page. Select the EX1200-dmm DMM from the list of available plug-in modules (the slot designation will vary depending on the mainframe being used).

  • Page 153: Performing Verification

    VTI Instruments Corp. 5) In the Reference Instruments section, select the appropriate instrument available on the GPIB/LAN network for the calibrator, external DMM, and function generator. This information can also be obtained from LAN/GPIB Gateway’s web page. Refer to the LAN/GPIB Gateway’s user’s manual for more information.
  • Page 154 www.vtiinstruments.com NOTE Detailed debug logs that describe what occurred during calibration/verification are saved to the “Current Working Directory” browser (typically C:\Documents settings\Username\Application Data\, although this varies from one browser to another). To find the actual location, open the Java Console by right clicking on the Java icon in the system tray and choose Java Console.

  • Page 156: Appendixa

    www.vtiinstruments.com PPENDIX NBOARD EMORY EMORY ISTINGS AND LEARING ROCEDURES The following table provides information regarding memory contained in the EX1200A mainframes and plug-in modules. Protocol for clearing the memory is also included. Product Component Volatile? Contains User Writeable? Clear Procedure EX1200A Chassis 4 MB Flash Time configuration...
  • Page 157 VTI Instruments Corp. Product Component Volatile? Contains User Writeable? Clear Procedure Model & serial None number file None 16 MB SPI Flash FPGA image None 2 MB Static RAM User pattern data Power off EX1200-3608 64 MB Flash Model & serial...

  • Page 158: Appendixb

    www.vtiinstruments.com PPENDIX OWER ONSUMPTION ODULE OWER ONSUMPTION The following tables provide power consumption information for the EX1200A series plug-in modules. The EX1200A mainframe power is also provided to assist in determining available power. Switch Module +3.3 V +5 V +24 V Notes 0.131 A 0.0037 A*...

  • Page 159: Application Note

    VTI Instruments Corp. PPLICATION VERVIEW As with any backplane-based system where modules share power, such as VXI and PXI, the possibility exists where a combination of plug-in modules may exceed the maximum power available from the power supply. There are two limitations that govern power delivery by a supply: 1) the maximum power of the power supply and 2) the maximum power that can be delivered to a single slot.
  • Page 160 www.vtiinstruments.com  EX1200-2001 with six (6) relays closed  EX1200-3048 with ten (10) relays closed  EX1200-3608 From the Plug-in Module Power Consumption section, the amount of current used by the switch card’s relays can be calculated and added to the total consumption on the 5 V rail: = card’s consumption + (number of relays closed)(relay consumption) 5V (EX1200-2001) = 0.0037 A + (6)(75 mA)

  • Page 162: Index

    www.vtiinstruments.com NDEX DMM ..................77 DMM Bus Out ............... 77 Ethernet.................. 73 2-wire resistance measurements ..........100 trigger bus ................75 DMM connections ..............100 cooling ..................37 2-wire RTD measurements crest factor ................34, 97 DMM connections ..............108 current measurements crest factor ................
  • Page 163 VTI Instruments Corp. troubleshooting ..............64 web page ................142 EX1202/EX1262 installation options ...........39 NTP.................... 144 rack ear, dual half rack ............42 rack ear, single half rack ............41 rackmount, dual half rack ............46 offset .................... 92 rackmount, single half rack ............44 tabletops .................39...
  • Page 164 www.vtiinstruments.com device info tab ..............133 troubleshooting monitor and control tab ............131 multiple network cards ............. 64, 68 true RMS ................33, 97 temperature measurements ............105 configuration ................ 105 using multiple network cards ............68 RTDs ..................107 thermistors ................

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