GENRAD 1433 Series Instruction
Contents
1. PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT 4 1433 SERIES High Accuracy Decade Resistor User and Service Manual a en LU l ET LABS l N C 534 Main Street Westbury NY 11590 www ietlabs com IET formerly manufacturer by TEL 516 334 5959 800 899 8438 FAX 516 334 5988 GenRad IET IET LABS INC 534 Main Sreet Westbury NY 11590 Tel 516 334 5959 800 899 8438 Fax 516 334 5988 http www ietlabs com STANDARDS DECADES New P roda u STROBES Find a Product TER TechniesiAnalleadans Formerly Manufactured By Va Sppiestiens QuadTech GenRad General Radio gt PAPA BR Request a Quote Price List Now being manufactured A A EE serviced calibrated A 0 Place an Order ans ru y rei Request a Catalo y a Reauest a Catalog Widest Choice Contact Us COST EFFECTIVE QUALITY ET y STANDARD OR CUSTOM SOLUTION of Decades R L CoRTDoVOLTAGE If you need products or CURRENT PROCESS CONTROL service by Genrad esi IET is compliant with ISO 9001 Biddle or others Product Area of Interest Y ISO IEC 17025 ANSI Z540 1 1994 and MIL STD 45662A Find a Products Technical Applications Request a Quote Place an Order Free Offer Request a Catalog Contact Us Copyright 1999 2001 IET Labs Inc All rights reserved Problems or Comments Contact webmaster ietlabs com To navigate our easy to use website for quick access to specifications and2. 100 000 1 111 1 11 111 111 110 1 111 100 11 111 000 111 110 000 1 111 11 11 111 1 111 111 1 111 110 11 111 100 111 111 000 11 111 11 111 111 1 1 111 111 11 111 110 111 111 100 111 111 110 1 111 111 10 11 111 111 0 111 111 110 1 111 111 11 11 111 111 1 111 111 111 YV vo 100 00 CO YIN A AI YI DI DID o ODO OU Y a Ur a A aaa aja 11 111 111 110 111 111 111 1 111 111 111 11 SPECIFICATIONS 1433 Series Chapter 3 OPERATION 3 1 Installation All models of the 1433 Decade Resistor are sup plied as bench instruments but may be rack mounted Installation in a standard 19 inch rack requires a Rack Mount Kit whose part number depends on the num ber of dials on the unit Refer to paragraph 1 3 3 2 Connections The terminals on the front panel of the 1433 are stan dard 3 4 inch spaced binding posts that accept ba nana plugs phone plugs spade lugs various clips and wire sizes up to No 12 The high H and low L binding posts are insulated from the panel and used for regular two terminal applications For grounded operation connect the shorting link between the ground G terminal and the low L terminal Refer to para graph 3 4 for a detailed comparison of two and three terminal connections If switches have not been operated for an extended period they should be rotate
3. 4 Item uantit Item Part Number Instruction Manual 1 Rack Mount Kit for 4 dial units 1433 50 Calibration Certificate 1 Rack Mount Kit for 5 dial units 1433 51 Rack Mount Kit for 6 dial units 1433 52 Rack Mount Kit for 7 dial units 1433 53 2 INTRODUCTION Chapter 2 SPECIFICATIONS Range mQ to 111 111 111 110 Q in 1 mA steps Overall Accuracy The difference between the resistance at any setting and at the Zero setting is equal to the indi cated value 0 01 2 mQ Decade Specifications R step Total R Stability L step Q Q ppm yr pH 0 001 0 01 500 0 01 0 1 500 0 01 0 1 1 50 0 1 1 10 20 0 15 10 100 20 0 55 100 1000 20 5 1 000 10 000 20 15 10 000 100 000 20 75 100 000 1 000 000 20 1 000 000 10 000 000 20 10 000 000 100 000 000 20 Typical Frequency Characteristics FREQENCY IN kHz Rev 3 23 06 SPECIFICATIONS Max Input 5A 1 6A 800 mA 250 mA 80 mA 23 mA 2 3 mA 0 7 mA 0 23 mA 1433 Series Power Tempco step W ppm C 0 025 50 0 16 20 0 25 20 0 6 20 0 6 15 0 6 5 0 5 5 0 5 5 0 5 5 0 5 10 0 1 10 Ne 1433 Series Typical Value of Zero Impedance Zero Resistance Ro 0 001 Q decade at dc 0 04 Q decade at 1 MHZ proportional to square root of fre quency above 100 kHz Zero Inductance Lo 0 1 uH decade 0 2 uH Effective Shunt Capacitance C Value is determined largely by the highest decade in use With the low terminal con nected to the shield a value
4. of 15 to 20 pF decade may be assumed counting decades down from the highest Thus if the third de cade from the top is the highest resistance a value of 45 to 60 pF may be assumed If the highest decade in the unit is in use the effec tive capacitance is 15 to 20 pF regardless of the settings of the lower resistance decades Switches Continuous rotation solid silver alloy contacts contact resistance of less than 1 mQ capacitance of less than 1 pF between contacts lifetime in excess of 1 million cycles Maximum voltage to case 2000 V peak Terminals Gold plated tellurium copper low thermal emf binding posts on standard 3 4 inch spacing shield terminal provided Mechanical Dimensions in inches mm Weight in Ib kg 4 dial 12 3 312 5 dial 14 8 375 3 5 89 5 0 127 3 5 89 5 0 127 3 5 89 5 0 127 5 3 135 5 0 127 6 dial 17 3 439 7 dial 17 3 439 Environmental Operating Storage 10 to 40 C lt 80 RH 20 to 65 C Rev 3 23 06 Supplied with unit Instruction manual Calibration Certificate Accessories available 1433 50 Rack Mount Kit for 4 dial units 1433 51 Rack Mount Kit for 5 dial units 1433 52 Rack Mount Kit for 6 dial units 1433 53 Rack Mount Kit for 7 dial units Ordering Information Catalog No Total Q 1 11 Ohms No step of dials 111 1 1 111 11 110 111 100 1 111 000 11 110 000 111
5. 5988 for FAX www ietlabs com 4 2 Instrument Return Before returning an instrument to IET for service please call our Service Department at 800 899 8438 for Return Material Authorization RMA Include a Purchase Order Number to insure expedient process ing Units under warranty will be repaired at no charge For any questions on repair costs or ship ment instructions please contact our Service De partment at the above number To safeguard an in strument during shipment please use packaging that is adequate to protect it from damage i e equiva lent to the original packaging and mark the box Deli cate Electronic Instrument Return material should be sent freight prepaid to IET Labs Inc 10 Dedham Street Newton MA 02461 Attention Service Department MAINTENANCE IET LABS INC Standards Decades Strobes Sound Level Meters Bridges Formerly manufactured by 534 Main Street Westbury NY 11590 TEL 516 334 5959 800 899 8438 FAX 516 334 5988 Gen Rad www ietlabs com IET LABS INC Standards Decades Strobes Sound Level Meters Bridges Formerly manufactured by 534 Main Street Westbury NY 11590 TEL 516 334 5959 800 899 8438 FAX 516 334 5988 Gen Rad www ietlabs com
6. AUTION N DO NOT APPLY ANY VOLTAGES OR CURRENTS TO THE TERMINALS OF THIS INSTRUMENT IN EXCESS OF THE MAXIMUM LIMITS INDICATED ON THE FRONT PANEL OR THE OPERATING GUIDE LABEL vii 1433 Series Chapter 1 INTRODUCTION 1 1 Product Overview The 1433 Decade Resistors are a family of instru ments providing a very broad choice of high perfor mance resistance sources Any number of decades from one to eleven is available The 1433 is a precision resistance source with ex cellent characteristics of stability temperature coef ficient power coefficient and frequency response There are over 30 models available covering a wide resistance range from 1 mQ to over 111 MQ The 1433 Series employs stable very low resistance switches with silver alloy contacts A special design keeps zero resistance to less than 1 mQ per decade Self cleaning keeps the silver contacts from becom ing tarnished when unused or when only low cur rents are passed through them This is most often the case when only minute test currents are drawn by digital multimeters or other test instruments Contact resistance is stable and remains low and repeatable The dials labeled 0 to X 10 offer smooth rotation from position to position with no stops Each dial has the overlap X 10 position for maximum convenience and flexibility in setting and adjusting resistance val ues The resistance per step and maximum current of each dial are clearly shown on the front
7. d a few times to restore contact resistance to specifications 3 3 Dial Readout All 1433 decades have easy to read dials with num bered steps from 0 to X 2 10 When setting the decade switches observe the decimal point on the panel and remember that X equals ten units For ex ample the five dial Model 1433 10 is set for a value of 54 3 Q by setting the decade switches as follows 054 30 5430 or 054 2X 54 3 Q OPERATION Note that X in the above example is equal to a value of ten 0 01 W units in that decade or one 0 1 Q unit in the next decade to the left The following examples illustrates the result of set ting all decades in the 1433 10 to X Dial setting XXX XX 10 Resistance value LA dg Q 3 4 Principles of Operation The best approximation of a complete equivalent circuit for a 1433 Decade Resistor is shown in Figure 3 1 R L L H o C G Figure 3 1 A simplified equivalent circuit for a decade box with the low L terminal tied to case In Figure 3 1 R setting of the decade box L L N AL N AL where Lo 0 1 uH per decade x number of decades in unit 0 2 WH A L Als L step values from specifications N N settings of corresponding decades C Co MC where C 15 pF C 20 pF M number of unused decades set to zero preceding first decade used 1433 Series The phase angle Q for this circuit is Q 0 L R RC At low values of R the L R term is dominant at high val
8. ecade x number of de cades in unit 0 2 uH AL AL L step values from specifica tions N N amp settings of corresponding decades Ca 10 Ma 8 pF where Ma number of unused decades set to zero preceding first decade used Cb 20 Mb 20 pF where Mb number of unused decades set to zero preceding first decade used Cs 2 2 pF OPERATION 1433 Series There is also some distributed capacitance Cd from H e Tibi Y UY O L the resistor to the case as shown in Figure 3 3 This capacitance has the effect of increasing the effec F n xd tive inductance by an amount of approximately N R C x 107 where N is the setting of the first used not zero decade R is the total value of the decade resistor and C is 2 pF G R c R Le a H L L 2 2 G Figure 3 3 Approximation of distributed capacitance effects OPERATION 7 1433 Series Chapter 4 MAINTENANCE 4 1 Customer Service The IET warranty attests to the quality of materials and workmanship in our products For application assistance or if difficulties occur our engineers will assist in any way possible If you cannot eliminate the difficulty please e mail FAX or phone our Ser vice Department giving full information of the trouble and of steps taken to remedy it Be sure to include the type and serial number of the instrument In the U S call 617 969 0804 for technical support 800 899 8438 or 516 334 5959 for customer service 516 334
9. edens 5 32 Connections uo cases ipe iste ro Pa d eget 5 3 3 Dial ReadoUtz tertie eek 5 3 4 Principles of Operation sese 5 Chapter 4 MAINTENANCE eee eeeneen aetates tna tosta sesso stone tastes sesso neto sense 8 4 1 Customer Service enuresia eai n ann nennen 8 4 2 Instrument Return cooconnccnoconocononcnoncnancnoncnn nono nononcnnnannn non ons 8 Figures Figure 1 1 1433 Series High Accuracy Decade Resistor 1 Figure 3 1 A simplified equivalent circuit for a decade box with the low L terminal tied to case sse 5 Figure 3 2 Equivalent three terminal circuit for a decade box with neither terminal tied to case sse 6 Figure 3 3 Approximation of distributed capacitance effects 7 N WARNING AN OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES Dangerous voltages may be present inside this instrument Do not open the case Refer servicing to qulified personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES gt 45 V ARE USED TAKE ALL MEASURES TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE CONDUCTORS WHEN USING THIS INSTRUMENT Use extreme caution when working with bare conductors or bus bars WHEN WORKING WITH HIGH VOLTAGES POST WARNING SIGNS AND KEEP UNREQUIRED PERSONNEL SAFELY AWAY N C
10. g T Gel Rad by TEL 516 334 5959 800 899 8438 FAX 516 334 5988 GenRad WARRANTY We warrant that this product is free from defects in material and workmanship and when properly used will perform in accordance with applicable IET specifications If within one year after original shipment it is found not to meet this standard it will be repaired or at the option of IET replaced at no charge when returned to IET Changes in this product not approved by IET or application of voltages or currents greater than those allowed by the specifications shall void this warranty IET shall not be liable for any indirect special or consequential damages even if notice has been given to the possibility of such damages THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUD ING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTIBILITY OR FITNESS FOR ANY PARTICULAR PURPOSE Contents WARRANTY seinen nen ds i WARNING ita aus binief v CAUTION 222 8 a A a a e oralen en v Chapter 1 INTRODUCTION 2 22000020020020000000002002002000200200200n000 0000000000000 0000 1 1 1 Product Ov rvieW cirri sissies iess reissaa 1 1 2 Accessories Included eee 2 1 3 Accessories Options Available sss 2 Chapter 2 SPECIFICATION 20s002000000200000000n00n20020000000000000000 0000000000000 0000 3 Chapter 3 OPERATION m eo 5 3 T Installation ete tete tereti ete
11. panel Elec trical shielding is provided by an attractive aluminum cabinet and front panel The resistance elements have no electrical connection to the cabinet and panel a separate shield terminal is provided High quality gold plated tellurium copper binding posts serve to minimize the thermal emf effects which can introduce errors into dc resistance measurements All INTRODUCTION other conductors within the instrument as well as the solder employed contain no metals or junctions that contribute to thermal emf problems With a resolution as low as 1 mQ and a maximum available resistance of over 111 MQ the 1433 series may be used for exacting precision measurement ap plications requiring high accuracy good stability and low zero resistance They can be used as compo nents of dc and ac bridges for calibration as transfer standards and as RTD simulators The 1433 Series may be rack mounted to serve as components in measurement and control systems This series is part of a family of resistance substitut ers suited to fill many engineering and testing needs Consult IET for High power substituters up to 400W High resistance substituters to 1 TQ RTD simulators Laboratory standard grade substituters to 1 ppm accuracy Programmable substituters J EEE 488 or BCD Figure 1 1 1433 Series High Accuracy Decade Resistor 1433 Series 1 2 Accessories Included 1 3 Accessories Options Available Table 1 3 Table 1
12. prices 1 Select Find a Product to go to a convenient scrolling thumbnail catalog and then to detailed data sheets as desired or 2 Select STANDARDS DECADES STROBES for products formerly manufactured by GenRad General Radio or QuadTech Since 1976 IET labs has had a long standing commitment to conform the instruments and standards we offer to the customer s needs rather than to have the customer settle for what is available We devote our customer service and applications entirely to the customer s satisfaction in the quality standards test instru ments and calibration service we provide e Combinations of functions special ranges ratings or accuracies e Replacement for discontinued models from other manufacturers e Calibration and repair services NIST traceable e Compliant with ISO 9001 ISO 17025 ANSI Z540 1 1994 and MIL STD 45662A sieges e Accuracy to 1 ppm Miren TO e Resolution to 0 1 ppm C Lor 1F e Voltage to 20 kV ac H 100 H e Power to over 1000 W mn e Programmable IEEE 488 or BCD e The World Standard in Metrology Featuring instruments formerly IET Since 1915 manufactured by Now continuing the GenRad tradition GenRad General Radio QuadTech PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT 4 1433 SERIES High Accuracy Decade Resistor User and Service Manual Copyright March 2006 IET Labs Inc 1433 im March 2006 l ET LABS l N C 534 Main Street Westbury NY 11590 www ietlabs com i
13. ues of R the RC term is more important The effective series resistance 1s R Rs 14 0 R C The effective parallel resistance is oL Rp R 1 At low values the series resistance remains constant to rather high frequencies because inductance has no effect on Rs At very low values skin effect increases Rs At high values the series resistance falls off rather rapidly with frequency because of capacitance The parallel resistance however is not affected by the lumped capacitance shown in the simple equivalent circuit see Figure 3 1 The parallel value is affected by distributed capacitance and dielectric loss not shown An approximate equation that considers these effects on Rp is 2 2 Rp R 1 L OR 10 40 R2102 250 RRy 1077 R The R10 term represents dielectric loss the next term represents distributed capacitance in the first decade used not zero and the last term represents distributed capacitance in the first decade if it is not used set to zero where Ry is the total possible value of that decade The last term is not used if the first decade is not set to zero When the case is not tied to either terminal the decade resistor becomes a three terminal circuit as shown in Figure 3 3 Cs 6 Figure 3 2 Equivalent three terminal circuit for a decade box with neither terminal tied to case In Figure 3 2 R setting of the decade box L L N AL N AL where Lo 0 1 uH per d
Download Pdf Manuals
Related Search