Product Manual - IET Labs, Inc.
Contents
1. Chapter 4 Maintanence Table of Contents 4 1 4 2 4 3 4 4 4 5 4 6 Preventative Maintenance a asan rectore ter ttr eter iei egg Calibration Interval General Considerations u eene etr Er tene Ere ERE Co Ede benen DB NE ERE eund Calibration Procedure Schematic Replaceable Parts List 1433 Series 1433 Series Tables and Figures Figure 1 1 1433 Series High Accuracy Decade Resistor 1 Figure 2 1 Sample operating guide affixed to unit serras 4 Figure 3 1 Optimal 4 Wire Kelvin Lead Connection nnen eenen nennen 6 Figure 4 1 1433 Series Schematic Diagram sees 8 Table 4 1 Replacement LISt u uuu us sassspaasnaspaniaasapapakayssiappinqkaqaqaskaskasskkakayanass 9 Figure 4 2 1433 Replaceable Parts u 9 iv Table of Contents 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 mQ to over 111 MQ The 1433 Series employs stable very low resistance switches with silver a2. 1433 J 1433 L ans va Dee meme pos pem Lea na ene pem Dem muna pes pem Dea ome s pm gt e 1433 Q Desa munaa e pa pee usar mom jee Desa nora 7 pes T Das manna 7 ena mer Dess omm 7 pes ee Dess mmm 7 pre mem Specifications 1433 Series Historic Resolution GR model numbers ume 3 CN J manna eme emme ora ema oo Dea aao o ena asa GC 0 pes L 7 OPTIONS 1433 50 Rack Mount Kit 4 dial 1433 51 Rack Mount Kit 5 dial 1433 52 Rack Mount Kit 6 and 7 dial 1433 XX RO Rear output binding posts 1433 XX K Kelvin type 4 terminal posts T Number of Total resistance decades 1433 34 1433 35 1433 36 1433 37 1433 Series pun o paxyje apinb Buljesado oydwes 4 z ainbig L02 40 E0 8v vd lueB e LI EEV L MOI SGERS MMM nea p e d u o D 886S VEE 919 xe4 BG6S VEE 91S 06SLL AN unqiseM Teens UIEN pes INI Y 8V1 Lil fq epew Ali uuoj Keme Ajayes jauuosied d y pue subs Burusem 1sog 9 sayoyms Bursn pe ueuw samod enowey q sio 9npuo2 ejeq jo osn ey SZIWIUIW pue uone nsui WNWIXeW esf e sjueuoduioo AI AUB y m 1981009 E U9pI99 PIOAR 0 senseeuu je aye pesn aie A Sp lt seDeijoA snopJezey Jenoueum 8Bel oA Jes eze eseo ou urejureu O 19p10 ur PUNOAB quee oj euruue 9 eu1j9euuo saben dul 10 s Bel oA U IY YUM Buom ueuw san Ajayes Ile eA 9SqO a en En SONINYVM ZSZELOEL LA NS
3. 4 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT 4 1433 SERIES High Accuracy Decade Resistor User and Service Manual roma seus GenRad 1433 14 100 kf DECADE RESISTOR TTTIIT Copyright O 2013 IET Labs Inc Visit www ietlabs com for manual revision updates 1433 im November 2014 Effective for serial numbers beginning with E e ietlabs IET IET LABS INC dE TEL 516 334 5959 e FAX 516 334 5988 e 0 aa ietlabs IET ET LAB S NC den TEL 516 334 5959 FAX 516 334 5988 1433 Series 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 INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE Table of Contents 1433 Series N WARNING AN OBSERVE ALL
4. 90 EEVL TICO se2 0 A 000 Jo uinuixeui o119 qns y ep O udd 0 x suk edd oo rx Wuidd osx A000 VI t O UINOOL HH 9608 07 01 01 suonipuoo Buneiedo Oojuudd sx suk sudd ger K amp uudd oer A007 vu z o UNOL Suomneorioeds 0 eouejsise1 opluoo 9401s9J 2 udd gx si egudd ces Wudd oer 0 Suonoeuip uloq ui sew Ma E perejo eq pinoys feu poued udd x sk guidd sez Wudd oer pepueixe ue 10 pejejedo ueeq jou oney seuouws jj uoge1edo Nionpuruou Fodder s eaudd ces wdd oer OL 01 0 poeu suonisod tuonejo4 ee 2 udd gx suk g udd z Judd oer snonunuoo sjoejuoo Aoje JeA rs pijos adyny d L UMS 7 udd s x sik gudd ger Wuidd oer yeed A 0002 eseg 0 eBeyoA XEN Oo udd oz x SJ gjudd ger Wuudd oer vw e xoxdde sdais OW OL aa gt wdd oz x si Audd Z7 Judd oer epeoep sed vu gt sd ls OIN LS e2ue siseH O19Z soueisisoy a 0e eee SLF ze Ost o udd og x suk ejudd sz yuidd oer BOUBR SISAI 0J9Z JO uonopnqns Jeye Do EZ IV ooueljsisa1 95 0 0 sdeis OIN OL edA 1uerajeo2 Auqeis dajsjied abejjoa 1u8uno opoeop deis Jed GW Z L0 0 sdeis OW LS Koeunooy 401SISeu dua uu l 6uo1 Auges xe je eouejsisaH SYOLSISAY 3QVO23G NOISIO3Hd Saldas cer Specifications 1433 Series Chapter 3 OPERATION 3 1 Initial Inspection and Setup This instrument was carefully inspected before ship ment It shoul
5. 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 qualified 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 A CAUTION AN 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 ii Table of Contents Chapter 1 Introduction 1 1 Product Overview Chapter 2 Specifications Decade Specifications Chapter 3 Operation 3 1 3 2 3 3 Contents Initial Inspection and Setup eicere desta tpe ECH ER boys teens bessen adt Connection 3 2 4 General Considerations ioci t ee eter deer e PE HH OR du ERES CERIS ERES 3 2 2 Electrical Consi derations 3 2 3 Four Wire Kelvin Lead Connections esee 3 2 4 Thermal emf Considerations esssseseeeene eene Dial Setting
6. Should cleaning be needed do the following 1 Remove the 4 screws from the sides of the housing and remove the housing 2 Remove any dust or debris using optical grade dry compressed air or a clean brush 3 Should switch contact cleaning or lubrica tion be required as may be indicated by an increase in the zero resistance this may be done be spraying the switch contacts with a conditioning compound such as WD 40 or Deoxit from Caig Laboratories or Super Lube with PTFE from Synco Chemical Corp 4 Replace the housing and reinstall the 4 hous ing screws The front panel should be periodically cleaned to eliminate any leakage paths around the binding posts To do this wipe the front panel clean using alcohol and a lint free cloth 4 2 Calibration Interval The recommended calibration interval for 1433 Series decade substituters is twelve 12 months The calibration procedure may be carried out by the user if a calibration capability is available by IET Labs or by a certified calibration laboratory If the user should choose to perform this procedure then the considerations below should be observed 4 3 General Considerations It is important whenever testing the 1433 Series Decade Units to be very aware of the capabili ties and limitations of the test instruments used A resistance bridge may be employed and there are direct reading resistance meters or digital multimeters available that can verify the accuracy of these u
7. ble to SI Zero resistance lt 1 MQ decades 1 mQ per decade at dc 10 MQ decade 3 mQ at dc Max voltage to case 2000 V peak Terminals 3 Gold plated 5 way tellurium copper binding posts with low thermal emf and low resistance Rear outputs are available as an option K Option Kelvin connection to is available as an option with 5 binding posts Typical Value of Zero Impedance Zero Resistance Ro lt 0 001 Q decade at de 0 04 Q decade at 1 MHz Proportional to square root of frequency above 100 kHz Switch capacitance lt 1 pF between contacts Zero Inductance Lo 0 1 wH decade 0 2 uH Switches Continuous rotation 11 positions marked 0 10 Multiple solid silver alloy contacts Environmental conditions Operating 10 C to 40 C Storage 40 C to 70 C Humidity lt 80 RH Supplied with unit Instruction manual Calibration Certificate Specifications Mechanical 3 decade 31 cm W x 8 9 cm H x 10 2 cm D 17k038 12 2 x 3 5 x 4 UN 37 6 cm W x 8 9 cm H x 10 2 cm D 4 5 decade 14 8 x 3 5 x 4 2 0 kg 4 3 8 9 decades 10 11 decades 48 3 cm W x 17 8 cmH x 17 8 3 5 kg 7 7 cmD 19 x 7 x 7 3 7 kg 8 1 8 Ib E 3 lb 43 9 cm W x 8 9 cm H x 10 2 cm D 6 7 decades 17 3 x 3 5 x 4 2 4 kg 5 3 Ib Tb 1 lb Ordering Information Total resistance Numberfof I Historic decades Resolution GR model numbers ao s sss usos Poe Jee 19 1433 U 1433 K pio
8. d be in proper electrical and mechanical order upon receipt An OPERATING GUIDE is attached to the case of the instrument to provide ready reference to specifications 3 2 Connection 3 2 1 General Considerations The 1433 Series Decade unit provides three terminals labeled H high L low and G ground The H and L terminals are connected to the set resistance the G terminal is connected to the case The G terminal may be used as a guard or shield terminal It may also be connected using a shorting link to the L terminal to allow two terminal as opposed to three terminal measurements In order to make the most stable measurements de termine which is the more sensitive of the two user leads i e the one going into a higher impedance This lead should be connected to the more protected of the two terminals H high or L low That would either be the terminal that is shorted to the case or the L terminal if neither is connected to the G case If switches have not been operated for an extended period they should be rotated a few times to assure that contact resistance is within specifications Operation 3 2 2 Electrical Considerations In order to make proper use of the full performance capabilities of the 1433 unit especially if low resis tance or low resistance increments are important take care when connecting to the terminals In particular in order to keep contact resistance to a minimum make the most subs
9. fall within these limits after subtraction of the zero resistance 5 If any resistances fall outside these limits the associated switch assembly may require trimming or replacement Maintanence 1433 Series 4 5 Schematic Figure 4 1 gives the schematic of the 1433 decade unit MOST SIGNIFICANT RESISTOR STEP MOST SIGNIFICANT DECADE LEAST SIGNIFICANT RESISTOR STEP LEAST SIGNIFICANT DECADE Figure 4 1 1433 Series Schematic Diagram 1433 Series 4 6 Replaceable Parts List Model Ref Description 1 Binding Post Red 2 Binding Post Black 3 Binding Post Green Knab Assembly ot Shown 1 mQ step Decade Switch Assembly ot Shown 10 mQ step Decade Switch Assembly ot Shown 100 mO step Decade Switch Assembly ot Shown 1 Q step Decade Switch Assembly ot Shown 10 Q step Decade Switch Assembly ot Shown 100 O step Decade Switch Assembly ot Shown 1 kQ step Decade Switch Assembly Not Shown 10 kQ step Decade Switch Assembly Not Shown 100 kQ step Decade Switch Assembly 1 MQ step Decade Switch Assembly 10 MQ step Decade Switch Assembly Table 4 1 Replacement List Model Ref OE EN Oo 3 ts Not Shown ied romes mts GenRad 1433 14 100 kN DECADE RESISTOR x 0 U 2 i wo Figure 4 2 1433 Replaceable Parts ma mas ko STEPS 10 Maintanence
10. he dc resistance measurement It is possible to eliminate this component of the reading error by taking a second measurement with the leads reversed and averaging the readings Operation 1433 Series 3 3 Dial Setting Whenever the dials are used in positions 0 9 the resulting resistance is read directly The decimal point and the steps are clearly marked on the panel For additional flexibility and range each decade provides a 10 position setting This 10 position on any one decade equals the 1 position on the next higher decade It adds about 11 to the nominal total decade resistance To determine the resistance obtained when one or more 10 settings are used simply add 1 to the next higher decade For example a setting of 3 6 10 0 10 Q becomes 3 3 0 0 0 d 6 6 0 0 0 1 1 0 0 0 0 D 10 1 0 TOT 3 7 0 1 0 and a setting of 10 10 10 10 10 10 Q becomes 10 1 0 10 1 10 d 10 10 10 oo ooo poco c He O O O G O eicreo e TOT 1 1 I 1 1 1 0 1433 Series Chapter 4 MAINTANENCE 4 1 Preventative Maintenance Keep the unit in a clean environment This will help prevent possible contamination The 1433 is packaged in a closed case which limits the entry of contaminants and dust to the inside of the instrument If it is maintained in a clean or air conditioned environment cleaning will seldom be required In a contaminated atmosphere cleaning may be required
11. lloy contacts A special design keeps zero resistance to less than 1 mQ per decade Self cleaning keeps the silver contacts from becoming tarnished when unused or when only low currents 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 resis tance is stable and remains low and repeatable The dials marked 0 to 10 offer smooth rotation from position to position with no stops Each dial has an overlap 10 position for maximum convenience and flexibility in setting and adjusting resistance values The resistance per step and maximum cur rent of each dial are clearly shown on the front panel Electrical shielding is provided by an attractive alumi num cabinet and front panel The resistance elements have no electrical connection to the cabinet and panel a separate shield terminal is provided Introduction High quality gold plated tellurium copper binding posts serve to minimize the thermal emf effects which can introduce errors into dc resistance measurements All other conductors within the instrument as well as the solder employed contain no metals or junctions that contribute to thermal emf problems With a minimum resistance as low as 1 mQ and a maximum available resistance of over 111 MQ the 1433 series may be used for exacting precision mea surement applications requiring high accuracy good stability and lo
12. nits especially when used in conjunction with standards that can serve to confirm or improve the accuracy of the testing instrument Such test instruments must be significantly more accu rate than 100 ppm 2 mQ for all applicable ranges allowing for a band of uncertainty of the instrument itself A number of commercial bridges and meters exist that can perform this task consult IET Labs It is important to allow both the testing instrument and the 1433 to stabilize for a number of hours at the nominal operating temperature of 23 C and at nominal laboratory conditions of humidity lt 80 RH There should be no temperature gradients across the unit under test Maintanence Substantial Kelvin type 4 wire test terminals should be used to obtain accurate low resistance readings It is convenient once the zero resistance has been determined to subtract it from the remaining mea surements This can be automatically done in many in struments which have an offset subtraction capability 4 4 Calibration Procedure 1 Employ proper metrological practices Allow a confidence band for the uncer tainty of the measuring instrument and setup 2 Confirm the zero resistance of the unit 3 Determine the allowable upper and lower limits for each resistance setting of each de cade based on the specified accuracy For the 1433 series these limits for any resistance R are R 0 0001 R 2 mQ 4 Confirm that the resistances
13. tantial and secure connection to the binding posts They accept banana plugs tele phone tips spade lugs alligator clips and bare wire The largest or heaviest mating connection should be made and where applicable the binding posts should be securely tightened These considerations may be relaxed whenever single milliohms are considered insignificant for the task being performed 1433 Series 3 2 3 Four Wire Kelvin Lead Connections Whenever possible 4 wire Kelvin leads the best connection should be employed Such a connection minimizes the effects of contact resistance and ap proaches ideal performance If the four terminals are available as clamps similar to alligator clips they may be connected to the necks of the binding posts on a 3 terminal unit If the four wire connections are available separately the optimal connections are shown in Figure 3 1 and Figure3 2 Figure 3 1 4 Wire connection to a 3 terminal unit Figure 3 2 4 Wire connection to a 5 terminal unit 6 Operation 3 2 4 Thermal emf Considerations The highest quality low emf components are used in the 1433 Series There nevertheless may be some minute thermal emf generated at the test leads where they contact the gold plated binding posts This emf will not manifest itself ifan ac measurement instrument is employed It will also be eliminated if a meter with a True Ohm capability is used Otherwise it may appear as a false component of t
14. w zero resistance They can be used as components 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 suitable for filling many engineering and testing needs Consult IET for HPRS High power substituters up to gt 400 W HRRS High resistance substituters to 1 TO RTD simulators HARS LX Laboratory standard grade substitut ers to ppm accuracy PRS Programmable substituters JEEE 488 or BCD SCPI protocol Figure 1 1 1433 Series High Accuracy Decade Resistor 1433 Series Chapter 2 SPECIFICATIONS For the convenience of the user the pertinent specifications are given in an OPERATING GUIDE affixed to the case of the instrument Decade Specifications st per step resistance per step per step En eit Long term Temperature bisque d stability coefficient Resistor type Spp tppm 3 yrs ppm C roma re ren oor ow 9 gt ma ee o sv ow 2 2 gt ma a wes zov cow 2 2 me ne m sv ow 2 2 ma oa z mv oem 2 moko uo zom mov ow 2 2 ama om ore vor ow 2 Subject to maximum of 2000 V to case Accuracy lt 1 MQ decades 0 01 2 mQ 10 MQ decades 0 03 after subtraction of zero resistance at 23 C tracea
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