Burster RESISTOMAT 2302-V001 Manual

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RESISTOMAT

präzisionsmeßtechnik gmbh & co kg

Version: 18.03.2004

Note:

The information contained in the following is subject to change without prior notice. No part of this document

must be reproduced or processed using electronic systems without prior, written approval.

burster does not provide any type of warranty for this device, including any implicit warranty concerning its

general quality or suitability for a particular purpose.

burster assumes no liability whatsoever for errors, incidental damage or consequential damage arising during

the operation of this device.

Manufacturer:

burster präzisionsmeßtechnik gmbh & co kg

Talstraße 1 - 5

76593 Gernsbach

Model 2302-V001

RESISTOMAT

Model 2302-V001

76587 Gernsbach

BOX 1432

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Page 1 The information contained in the following is subject to change without prior notice. No part of this document must be reproduced or processed using electronic systems without prior, written approval. burster does not provide any type of warranty for this device, including any implicit warranty concerning its general quality or suitability for a particular purpose.
Page 2 Model 2302-V001 ® RESISTOMAT Page 2...
Page 3 Model 2302-V001 ® RESISTOMAT Page 3...
Page 4 Model 2302-V001 ® RESISTOMAT Overview of contents Page 4...
Page 5: Table Of Contents
Model 2302-V001 ® RESISTOMAT Overview of contents Pages Introduction and applications..............7 Introduction..................... 7 Four-wire resistance measurement..............8 Applications....................10 Description of functions................11 General information..................11 Current source....................11 Digital voltmeter....................12 Brief guide..................... 13 Operation....................... 15 Mains connection................15 Power-on..................
Page 6 Model 2302-V001 ® RESISTOMAT Page 6...
Page 7: Introduction And Applications
Model 2302-V001 ® RESISTOMAT Introduction and applications Introduction Since 1970, RESISTOMAT ® equipment has provided modern solutions to problems related to the measurement of low resistances. This equipment was developed with the aim of replacing the traditional Thomson bridge with a more efficient system.
Page 8: Four-Wire Resistance Measurement
Model 2302-V001 ® RESISTOMAT Four-wire resistance measurement If you have ever used a Thomson bridge, you must have noticed occasional interference caused by supply-line resistances, though popular opinion has it that the influence of these lines should be negligible. Actually, it is negligible only as long as the line resistances do not exceed a certain, very low limit;...
Page 9 Model 2302-V001 ® RESISTOMAT I = const. R LI beeinflusst Ergebnis nicht does not influence the result Figure 2: RESISTOMAT circuit The current driven through the object under test is completely independent of variations in the bridge resistance (object under test plus supply lines), at least as long as the compliance- voltage limit of the current source is not exceeded.
Page 10: Applications
(max. 0.5 V final value) . This allows the measurement and testing of thermal e.m.fs and mV sources. e.g. the thermocouple simulator made by burster präzisionsmeßtechnik. Page 10...
Page 11: Description Of Functions
Model 2302-V001 ® RESISTOMAT Description of functions General information The principle of current and voltage measurement for resistances is initially represented by two completely separate blocks of functions: The multi-range constant-voltage source and the highly-sensitive digital voltmeter. Both components are controlled via coupled switches which comprise the range selector on the front panel.
Page 12: Digital Voltmeter
Model 2302-V001 ® RESISTOMAT Digital voltmeter Our integrated digital voltmeter Model 7122 serves as the display unit. It has a display range of 20 000 for an input voltage of 2 V. The measurement signal from the test unit, which is fed into the device via the Cu terminals + U / - U, is raised to this level by a high-precision pre-amplifier.
Page 13: Brief Guide
Model 2302-V001 ® RESISTOMAT Brief guide Mains toggle switch Mains fuse for 220 V operation for 115 V operation Selector switch for activating/deactivating temperature compensation Range selector providing a choice of two different measurement currents for most ranges. Select the higher current whenever permissible. Zero potentiometer for voltmeter section Voltmeter input (potential leads from the test unit).
Page 14 Model 2302-V001 ® RESISTOMAT Page 14...
Page 15: Operation
Model 2302-V001 ® RESISTOMAT Operation Mains connection If not otherwise requested, we supply the device for 230 V/50 Hz operation. Ensure that the correct operating voltage is supplied. The maximum permissible deviation from the rated value is + 6 %, - 10 %. Alternatively, an operating voltage of 115 V/ 50 Hz or 60 Hz is also possible.
Page 16: Temperature Compensation
Model 2302-V001 ® RESISTOMAT Temperature compensation Turn switch on and connect the temperature sensor Model 2391 to socket For the system to work properly, the external sensor must assume the temperature of the test object; the two components must therefore be in close thermal contact. In practice, the temperature sensor is frequently used for the measurement of meter- samples as it can be firmly installed at the point where the samples are clamped, whether in a water basin - e.g.
Page 17: Connecting The Test Unit
Model 2302-V001 ® RESISTOMAT Evidently, the display is heavily distorted in the higher ranges due to the inclusion of the zero error. The most accurate display is provided in the 2 mΩ range. After determining a suitable measurement range, you must decide whether it is permissible for the test object to be loaded by the current stated on the left half of the switch's scale.
Page 18: Shielding
Model 2302-V001 ® RESISTOMAT At this point, we would like to refer to our clamping devices Model 2381 and Model 2382 which are meant for operation in air and water respectively and ensure proper contact with your samples. Another possible connection shown below involves the measurement of contact resistances on switches.
Page 19: Range Transgression
Model 2302-V001 ® RESISTOMAT Range transgression This display flashes if a value of 20 000 is exceeded, i.e. if the selected measurement range is too small. This does not necessarily mean that the R display lights up as well, as the voltage across the current terminals is much larger than the maximum value of the measurement voltage + U / - U.
Page 20: Test Units With A Large Inductive Proportion
Model 2302-V001 ® RESISTOMAT Also based on a reduction of inductance, the following method is very suitable for three-wire cables: Connect two wires at one end of the drum to the ® RESISTOMAT and join them together at the other end so that these wires are measured in a series connection.
Page 21: Calibration
Model 2302-V001 ® RESISTOMAT Calibration ® You can test the calibration of your RESISTOMAT micro-ohmmeter at any time by correctly connecting standard or calibration resistances. Suitable types which can be easily connected to the measurement terminals using the Type 2394 adapter are available in accordance with our specifications sheet 1240. For accurate testing, a resistance providing a display of at least 10,000 should be available for each measuring range.
Page 22 Model 2302-V001 ® RESISTOMAT Page 22...
Page 23: Test And Offset Instructions
Model 2302-V001 ® RESISTOMAT Test and offset instructions These instructions cover the entire procedure of re-calibration. If only small measurement deviations occur, it is sufficient to just check individual items. The digital voltmeter can be demounted (by removing the two screws on each side) to allow easier access to the printed circuit boards.
Page 24 Model 2302-V001 ® RESISTOMAT Test the voltage display with the mV generator (e.g. 6705). Connect it to + U / - U and adjust the left decade of the display from 0 to 2 (the display ranges from 00000 to 20000). The voltages required for single steps are Range 2 mΩ/3A 3 mV...
Page 25 Model 2302-V001 ® RESISTOMAT Switch over to 2 Ω/100 mA. Using P 2, set the same display value as previously (individual correction of the 100 mA current). If this value cannot be attained, replace the resistance R 14/120 K . The ranges 200 mΩ/100 mA, 200 mΩ/1 mA, 20 Ω/10 mA, 20 Ω/1 mA must now be accurate within ±...
Page 26 Model 2302-V001 ® RESISTOMAT Page 26...
Page 27: Rs232 Data Output
Model 2302-V001 ® RESISTOMAT RS232 data output Pin assignment and configuration The interface card is pre-configured and ready for operation on delivery. The factory settings are : Baud rate: 9600 Data bits: (firmly specified) Stop bits: (firmly specified) Parity: none (firmly specified) Operating mode: Interface...
Page 28: Protocol Description
Model 2302-V001 ® RESISTOMAT Protocol description A computer can be used to communicate with the device via the serial interface. Characters are transmitted as bit sequences in a specified format via the serial interface. The bit sequence is hardware-configured, i.e. the signals intended for transmission are firmly embedded in frames.
Page 29 The instruction string is termed header in the following. During addressing, it must be noted that all burster devices respond to four address values, provided that this option has not been inhibited with a special instruction: <0><0>...
Page 30 Model 2302-V001 ® RESISTOMAT burster devices therefore allow instructions in a bus system to be executed not only at individual stations but also globally. Special instruction codes (e.g. for global measurement start) are thus neither required nor provided. The protocol list selected for our devices is described in subcategory 2.5 of the ANSII standard.
Page 31: Instructions For Identification And Protocol Parametrization
Model 2302-V001 ® RESISTOMAT The instruction code can be followed by a separator. This is the ASCII character STX (Control-B (CB), 0x02). It indicates that the instruction string is followed immediately by an information telegram (parameter string). <Parameter string> (optional) Some instructions specify functions for which additional information needs to be supplied to the interface.
Page 32 Model 2302-V001 ® RESISTOMAT Slave responds: "Message understood “; addresses 00, 07, 10 and 17 are accepted. <ACK> (stands for: character delay, W1 instruction) During the transmission of characters, the interface is to wait for n ms between each consecutive character. Note: Power-on state in acc.
Page 33 Model 2302-V001 ® RESISTOMAT (stands for: enable block check, W instruction) The interface is to include a block check character in string transmissions. This character is appended to every information telegram after the last control character. Note: Power-on state -> block check on. Example: Master transmits:"Slave at address 00.
Page 34 Model 2302-V001 ® RESISTOMAT Meaning of the error codes: Code: Meaning: No error Not used Wrong command string Wrong parameter number Not used Faulty address bytes Faulty command bytes Wrong command code Wrong control character Faulty control character Faulty message block Wrong format number Parameter outside permissible range Wrong program number...
Page 35 Model 2302-V001 ® RESISTOMAT (stands for: identification, R3 instruction) The addressed device is to transmit its type description to the controller (Master). The type description contains the type number, software version and serial number, each separated by a blank. Example: Master transmits:"Slave at address 11.
Page 36: Instructions For Requesting Measurement Values And Identifying Faults
Model 2302-V001 ® RESISTOMAT (stands for: reset, W3 instruction) The addressed device is to perform a reset ("warm start"). Example: Master transmits:"Slave at address 00, perform a reset." 00rsC <B> <B>: Block check character <EOT>00rs<ENQ><B> Slave responds: "Message understood." <ACK> (stands for: set (message-) delay, W1 instruction) During communication, the interface is to wait between the reception of a message and the transmission of a new one.
Page 37 Model 2302-V001 ® RESISTOMAT 1 -> The measurement value is new and has not been read in previously. 0 -> The measurement value has been read in previously. This instruction is meant for quick transmission of measurement values. At a baud rate of 9600, about 15 measurement values can be read in per second.
Page 38 Model 2302-V001 ® RESISTOMAT The following display types are assigned to the format numbers: C-format Display %9.0f ±********* %9.1f ±*******.* %9.2f ±******.** %9.3f ±*****.*** %9.4f ±****.**** %9.5f ±***.***** %9.6f ±**.****** %9.7f ±*.******* %9.8f ±.******E±** Floating point Example: Master transmits:"Slave at address 17. For the future communication of measurement values, select Format 3 plus unit transmission."...
Page 39: Instructions For Device Control
Model 2302-V001 ® RESISTOMAT Instructions for device control Description of programmable parameters: Some characteristics of the interface module are specified using programmable parameters. These can be changed with the parameter write instruction (pw) and read out with the parameter read instruction (pr). If the parameters are to be used on a long-term basis, they must be stored in the EEPROM with the store EPROM instruction (se) which allows them to be used even after the module is restarted.
Page 40 Model 2302-V001 ® RESISTOMAT Parameter 9: This parameter contains the table header for printouts. The header must not exceed 70 characters or contain special German characters. Parameter 10: SRQ flag (service request). Depending on its value, this parameter effects a continuous printer output on every new A/D conversion, or only when a service request signal ( input/output line P5 ) is present.
Page 41 Model 2302-V001 ® RESISTOMAT (stands for: parameter read, W1/R instruction) The value of the requested parameter is to be transferred from the addressed device. Par.-No. Meaning Value range Parameter number >=0 Example: Master transmits:"Slave at address 00. Send me the current value of parameter 33!"...
Page 42 Model 2302-V001 ® RESISTOMAT (stands for: store eeprom, W instruction) The addressed device is to store the modified parameters in its non-volatile memory. Note that this instruction could take several seconds to execute depending on the number and length of the programmed parameters. Example: Master transmits: "Slave at address 00.
Page 43: Sample Program For Ibm-Pc
PC, and can be used for testing. They are not meant to serve as a basis for designing professional software, which requires a high degree of fault-tolerance and reliability. burster Präzisionsmeßtechnik will supply communications routines for the ANSII X3.28 protocol in MS-C and complete, customized programs on request. Page 43...
Page 44 Model 2302-V001 ® RESISTOMAT Page 44...
Page 45: Schaltungsunternlagen And Accessories
Model 2302-V001 ® RESISTOMAT Circuit diagram and Accessories Circuit digram Picture 6: Circuit diagram - Current source Page 45...
Page 46 Model 2302-V001 ® RESISTOMAT Picture 7: Circuit diagram - Voltage amplifier Page 46...
Page 47 Model 2302-V001 ® RESISTOMAT Picture 9: Assembly of Mother board Page 47...
Page 48 Model 2302-V001 ® RESISTOMAT Picture 10: PCB of Voltage Amplifier Picture 11: PCB of Current source Messpunkte für Nullstellung V 4 Test points of zeroing of V 4 Ab F - Nr. 11864 From F - Nr. 11864 Page 48...
Page 49: Accessories
Application DKD Calibration Certificate The 0.02 class calibrated resistors excel in their modern burster präzisionsmeßtechnik at Gernsbach have set up a design and small mechanical dimensions. Their calibration centre for electrical quantities, connected to the ruggedness also ensures a long life.
Page 50 Model 2302-V001 ® RESISTOMAT For the check-up of our resistance measurement devices in Technical Data section 2.3 following adaptors are available: Adaptor model 2394 for the devices 2302, 2304, Design and construction of the resistor as follows: 2305 and 2319-B ®...
Page 51: Clamping Device
® RESISTOMAT Clamping Device Model 2381 Model 2381-V001 Model 2382 L (Datenblatt - burster Katalog: 2381) Type 2381 Detail photo type 2381 Detail-Foto Typ 2381-V001 Type 2381-V001 Type 2382 L During the manufacture of wires, rails, cables and sector conductors, the electrical conductivity respectively the resistance must be checked for compliance with specified values.
Page 52 Model 2302-V001 ® RESISTOMAT Clamping Device Model 2381 Technical Data With the help of the clamping device model 2381 and a milliohm or Measurement length: 1000 mm microohmmeter of the RESISTOMAT ® series, the ohmic Clamping device: designed for cross-sections of 1 ... 1000 mm resistances of test cables and samples of materials in the shape of Distance between voltage and current-clamp: 420 mm...
Page 53: Kelvin Test Tongs/Testprobes
Model 2302-V001 ® RESISTOMAT KELVIN Test Tongs and KELVIN Test Probes Model 2385-V001 Model 2385-V020 Model 2386-V001 Model 2387-V001 Model 2387-V020 Four-wire system Contact profiles for a multitude of applications Widest possible test sample diameter range Description Applications All of the Kelvin test tongs and Kelvin test probes Particular attention is to be paid to the contact when described operate on a four-wire system.
Page 54 Model 2302-V001 ® RESISTOMAT Designs Kelvin Test Tongs ;odel 2386-V001 Kelvin Test Tongs Model 2385-V001 These test tongs are used for the measurement of ohmic These test tongs are ideal for resistance tests on small components and resistances in test bays of cable drums ready for dispatch as are gold-plated which helps to retain lower contact resistance.

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