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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
1433 SERIES
High-Accuracy
Decade Resistor
User and Service Manual
Copyright © 2018 IET Labs, Inc.
Visit www.ietlabs.com for manual revision updates
1433 im/October 2018
Effective for serial numbers beginning with "E"
www.ietlabs.com
IET LABS, INC.
Email: info@ietlabs.com
TEL: (516) 334-5959 • FAX: (516) 334-5988
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Summary of Contents for IET Labs 1433 Series
- Page 1 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT 1433 SERIES High-Accuracy Decade Resistor User and Service Manual Copyright © 2018 IET Labs, Inc. Visit www.ietlabs.com for manual revision updates 1433 im/October 2018 Effective for serial numbers beginning with “E” www.ietlabs.com IET LABS, INC.
- Page 2 IET LABS, INC. Email: info@ietlabs.com TEL: (516) 334-5959 • FAX: (516) 334-5988...
- Page 3 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 specifi cations. 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.
- Page 4 1433 Series WARNING 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 qualifi ed personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES (>...
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Page 5: Table Of Contents
1433 Series Contents Chapter 1 Introduction ................1 1.1 Product Overview ....................1 Chapter 2 Specifi cations ................2 Decade Specifi cations ....................2 Chapter 3 Operation ..................5 3.1 Initial Inspection and Setup .................. 5 3.2 Connection ......................5 3.2.1 General Considerations ................5 3.2.2 Electrical Considerations ................ - Page 6 1433 Series Tables and Figures Figure 1-1: 1433 Series High Accuracy Decade Resistor ........1 Figure 2-1: Sample operating guide affi xed to unit ..........4 Figure 3-1: Optimal 4-Wire Kelvin Lead Connection ..........6 Figure 4-1: 1433 Series Schematic Diagram ............8 Table 4-1: Replacement List ..................
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Page 7: Chapter 1 Introduction
The 1433 is a precision resistance source with ex- maximum available resistance of over 111 MΩ, the cellent characteristics of stability, temperature coef- 1433 series may be used for exacting precision mea- fi cient, power coeffi cient, and frequency response. surement applications requiring high accuracy, good stability, and low zero-resistance. - Page 8 1433 Series Chapter 2 SPECIFICATIONS For the convenience of the user, the pertinent specifi cations are given in an OPERATING GUIDE affi xed to the case of the instrument. Decade Specifi cations Total Long-term Temperature Resistance Max voltage Max power...
- Page 9 1433 Series Mechanical: Model Dimensions Weight 31 cm W x 8.9 cm H x 10.2 cm D 3 decade 1.7 kg 3.8 lb (12.2" x 3.5" x 4") 37.6 cm W x 8.9 cm H x 10.2 cm D 4-5 decade 2.0 kg 4.3 lb...
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Page 10: Chapter 2 Specifi Cations
1433 Series Specifi cations... -
Page 11: Chapter 3 Operation
3.2.1 General Considerations milliohms are considered insignifi cant for the task being performed. 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. -
Page 12: Four-Wire Kelvin-Lead Connections
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. -
Page 13: Thermal Emf Considerations
The highest-quality low-emf components are used Whenever the dials are used in positions 0-9, the in the 1433 Series. There nevertheless may be some resulting resistance is read directly. The decimal minute thermal emf generated at the test leads where point and the steps are clearly marked on the panel. -
Page 14: Chapter 4 Maintanence
IET Labs, The 1433 is packaged in a closed case, which limits or by a certifi ed calibration laboratory. If the user... -
Page 15: Calibration Procedure
3. Determine the allowable upper and lower limits for each resistance setting of each de- cade based on the specifi ed accuracy. For the 1433 series, these limits for any resistance “R” are [R±(0.0001 R + 2 mΩ)]. 4. Confi rm that the resistances fall within these limits after subtraction of the zero resistance. -
Page 16: Replaceable Parts List
1433 Series 4.6 Replaceable Parts List Model Ref IET Pt No Description BP-1000-RD Binding Post, Red BP-1000-BK Binding Post, Black BP-1000-GN Binding Post, Green 1433-4300-KNB Knob Assembly Not Shown 1433-3100 Foot Not Shown 1433-4000-X-.001 1 mΩ/step Decade Switch Assembly Not Shown 1433-4000-X-0.01...
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