Tektronix 370B User manual

User Manual
370B
Programmable Curve Tracer
070-A838-50
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
www.tektronix.com

Copyright Tektronix Japan, Ltd. All rights reserved.
Copyright Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Tektronix Japan, Ltd., 5–9–31 Kitashinagawa, Shinagawa–ku, Tokyo 141–0001 Japan
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.


Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, Tektronix,
at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair
damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction
caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or integrated with other
products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO
THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE
OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES.

Contacting Tektronix
Phone [phone]*
Address Tektronix, Inc.
Department or name (if known)
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
Web site www.tektronix.com
Sales support 1-800-833-9200, select option 1*
Ser ice support 1-800-833-9200, select option 2*
Technical support Email: [email protected]
1-800-833-9200, select option 3*
1-503-627-2400
6:00 a.m. – 5:00 p.m. Pacific time
*This phone number is toll free in North America. After office hours, please lea e a
oice mail message.
Outside North America, contact a Tektronix sales office or distributor; see the
Tektronix web site for a list of offices.

370B User Manual i
TableĂofĂContents
General Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kelvin sense 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rackmounting Information 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rackmounting 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repacking for Shipment 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics
Controls and Connectors 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
General Description of Instrument Operation 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . .
First Time Operation 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Operating Information 3–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Examples 3–49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GPIB
Review 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Capabilities 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controlling the 370B over the bus 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device-Dependent Message Format 4–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
370B GPIB Commands 4–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Requests 4–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
Appendix A: Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Options and Accessories B–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Options B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories B–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Diagnostic Routines and Messages C–1. . . . . . . . . . . . . . . . .
Diagnostic Routines C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Messages C–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Inspection and Cleaning D–1. . . . . . . . . . . . . . . . . . . . . . . . . .
Index

Table of Contents
ii 370B User Manual
ListĂofĂFigures
Figure 1–1: Example of Kelvin sense connection 1–7. . . . . . . . . . . . . . . . .
Figure 1–2: Location of the Rackmount Latch release 1–8. . . . . . . . . . . .
Figure 1–3: Rackmount hole spacing 1–9. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–4: Rackmounting Length and Clearance 1–9. . . . . . . . . . . . . . .
Figure 1–5: Rackmounting Hardware 1–10. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 1–6: Mounting Stationary rackmount Sections 1–11. . . . . . . . . . . .
Figure 1–7: Cabinet to Rackmount Conversion 1–13. . . . . . . . . . . . . . . . . .
Figure 2–1: Instrument Power and CRT Controls 2–2. . . . . . . . . . . . . . . .
Figure 2–2: Measurement, ACQ, Mode, and MAG Controls 2–4. . . . . . .
Figure 2–3: Memory Index and Setup Controls 2–6. . . . . . . . . . . . . . . . . .
Figure 2–4: Display Controls 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–5: Cursor and Position Controls 2–13. . . . . . . . . . . . . . . . . . . . . .
Figure 2–6: Step Generator Controls 2–16. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–7: Collector Supply Controls 2–19. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–8:AUX Supply, GPIB Controls, FAST/SHIFT, and Floppy Disk
Drive 2–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2–9: Signal Output Controls and Connectors, Configuration
Controls and Indicators, and Input Connector 2–25. . . . . . . . . . . . . . .
Figure 2–10: Rear–panel controls and connectors 2–27. . . . . . . . . . . . . . . .
Figure 2–11: Readout Display 2–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–1: 370B Block Diagram 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–2: Display of I vs. E for 1 k resistor 3–7. . . . . . . . . . . . . . . . . . . .
Figure 3–3: Display of signal diode forward-bias characteristics 3–8. . . .
Figure 3–4: Display of signal diode reverse-bias characteristics 3–9. . . .
Figure 3–5:Adjustment of LOOPING COMPENSATION control 3–10. .
Figure 3–6: Display of Zener diode I vs. E characteristic 3–11. . . . . . . . . .
Figure 3–7: Measuring breakdown voltage with the Dot cursor 3–12. . . .
Figure 3–8: IC vs. VCE for 10 steps of base current 3–14. . . . . . . . . . . . . .
Figure 3–9: IC vs. VBE for 10 steps of base current 3–15. . . . . . . . . . . . . .
Figure 3–10: IC vs. IB 3–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–11: IB vs. VCE 3–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–12: Display of FET common-source characteristic curves: ID vs
VDS for 10 steps of gate voltage. 3–17. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–13: Measuring hFE with the Dot cursor 3–19. . . . . . . . . . . . . . . .

Table of Contents
370B User Manual 
Figure 3–14: Measuring hFE with the Window cursor 3–19. . . . . . . . . . . .
Figure 3–15: CONFIGURATION control set to BASE STEP GEN (NORM)
3–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–16: CONFIGURATION control set to EMITTER STEP GEN 3–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–17: Stored envelope display. 3–24. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–18:Averaging display. 3–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–19: The floppy disk write–protect tab 3–26. . . . . . . . . . . . . . . . . .
Figure 3–20: Inserting a floppy disk 3–26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–21: Different Collector Supply Outputs. 3–34. . . . . . . . . . . . . . . .
Figure 3–22: Display Looping 3–35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–23: Step Generator output 3–36. . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–24: Directory Display 3–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–25: Bipolar Transistor Common-emitter Configuration 3–50. . .
Figure 3–26: Bipolar Transistor Family of Curves 3–50. . . . . . . . . . . . . . .
Figure 3–27: Bipolar Transistor Open-Collector Configuration 3–52. . . .
Figure 3–28: Bipolar Transistor Curve 3–52. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–29: Bipolar Transistor Common-base Configuration 3–53. . . . .
Figure 3–30: Bipolar Transistor Family of Curves 3–53. . . . . . . . . . . . . . .
Figure 3–31: Common-source FET Configuration Diagram 3–54. . . . . . .
Figure 3–32: Common-source FET Configuration Family of Curves 3–55
Figure 3–33: Silicon-controlled Rectifier Configuration Diagram 3–56. . .
Figure 3–34: Silicon-controlled Rectifier Curve 3–57. . . . . . . . . . . . . . . . . .
Figure 3–35: Diode Configuration Diagram 3–58. . . . . . . . . . . . . . . . . . . . .
Figure 3–36: Diode Curve 3–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3–37: Zener Diode Configuration Diagram 3–59. . . . . . . . . . . . . . .
Figure 3–38: Zener Diode Curve 3–60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–1: GPIB messages 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–2: GPIB message types 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–3: Rear panel configuration switch 4–10. . . . . . . . . . . . . . . . . . . .
Figure 4–4: Bus configurations 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–5: Transfer of settings 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–6: Transfer of waveforms 4–19. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4–7: Data transfers under GPIB control 4–21. . . . . . . . . . . . . . . . . .

Table of Contents
iv 370B User Manual
ListĂofĂTables
Table 1–1: Line voltage ranges 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1–2: Power Cord Color Conductor Identification 1–3. . . . . . . . . . .
Table 1–3: Power cord identification 1–4. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–1: Front Panel Controls Settings Not Stored 2–7. . . . . . . . . . . . .
Table 2–2: CONFIGURATION Mode HORIZONTAL Voltage 2–11. . . . .
Table 2–3: Step Generator Polarity 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2–4: Max Peak Power vs. Series Resistors 2–20. . . . . . . . . . . . . . . . .
Table 2–5: Collector Supply Polarity Functions 2–21. . . . . . . . . . . . . . . . . .
Table 2–6: The FAST/SHIFT Button Used With Other Buttons 2–24. . . .
Table 3–1: Default Setup 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3–2: Measurements Made by the 370B Display 3–31. . . . . . . . . . . . .
Table 3–3: Polarities of the Collector Supply and Step Generator Output
3–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–1: GPIB Interface Specifications 4–6. . . . . . . . . . . . . . . . . . . . . . .
Table 4–2: Controller Output Syntax 4–14. . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–3: Controller Input Syntax 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–4: Numeric Argument Formats 4–25. . . . . . . . . . . . . . . . . . . . . . . .
Table 4–5: Argument Format Examples 4–25. . . . . . . . . . . . . . . . . . . . . . . .
Table 4–6: Front Panel Control Commands and Queries 4–28. . . . . . . . .
Table 4–7: Display-Data and CRT Readout I/O Commands and Queries4–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–8: System Commands and Queries 4–30. . . . . . . . . . . . . . . . . . . . .
Table 4–9: Front Panel Controls 4–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–10: Display Data and CRT Readout I/O 4–38. . . . . . . . . . . . . . . .
Table 4–11: System Commands and Queries 4–41. . . . . . . . . . . . . . . . . . . .
Table 4–12: Status Byte Responses 4–44. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4–13: Status Byte and Event Code 4–46. . . . . . . . . . . . . . . . . . . . . . .
Table A–1: Collector Supply A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–2: Step Generator A–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–3: AUX Supply A–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–4: Non-store Vertical Deflection System A–8. . . . . . . . . . . . . . . .
Table A–5: Digital Storage Vertical Acquisition A–10. . . . . . . . . . . . . . . . .

Table of Contents
370B User Manual 
Table A–6: Non-store Horizontal Deflection System A–11. . . . . . . . . . . . . .
Table A–7: Digital Storage Horizontal Acquisition A–12. . . . . . . . . . . . . . .
Table A–8: CRT and Readout A–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–9: Adapter Connectors A–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–10: Power Supply A–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table A–11: Surge Current 
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# .+ "*'#/ 
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Table B–1: Standard accessories B–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–2: Optional accessories B–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B–3: Recommended accessories B–3. . . . . . . . . . . . . . . . . . . . . . . . .
Table C–1: Power-on System Error Messages C–2. . . . . . . . . . . . . . . . . . .
Table C–2: Front Panel Control Identification C–3. . . . . . . . . . . . . . . . . .
Table C–3: Messages C–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table D–1: External inspection check list D–1. . . . . . . . . . . . . . . . . . . . . .

Table of Contents
 370B User Manual

370B User Manual vii
General Safety Su ary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
Use Proper Power Cord. Use only the power cord specified for this product and
certified for the country of use.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is grounded through the grounding conductor
of the power cord. To avoid electric shock, the grounding conductor must be
connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
Observe All Ter inal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
The common terminal is at ground potential. Do not connect the common
terminal to elevated voltages.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Da p Conditions.
Do Not Operate in an Explosive At osphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
To Avoid Fire or
Personal Injury

General Safety Summary
viii 370B User Manual
Terms in this Manual. These terms may appear in this manual:
 Warning statements identify conditions or practices that could result
in injury or loss of life.
 Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
  " !
  

  !

  
Symbols and Terms

Getting Started

370B User Manual 1-1
Getting Started
This section provides the following information:
Description and features of the 370B Programmable Curve Tracer.
Initial inspection procedure
Installation procedures
Kelvin Sense
Rackmounting information
Repackaging procedure for shipment
Product Description
The 370B is a high performance, GPIB programmable digital storage curve
tracer that provides static and dynamic semiconductor device measurements. The
instrument stimulates, measures, and displays the semiconductor characteristics
of a variety of two–, three–, and four–terminal devices; including bipolar
transistors, field effect transistor, silicon controlled rectifiers, diodes, thyristors,
opto–isolators, wafers, and integrated circuits. A variety of measurements can be
performed using either grounded–emitter or grounded–base configurations.
The Collector Supply produces AC, Rectified AC, or DC voltages ranging from
0 to 200 volts. This high voltage, combined with a current sensitivity of
100pA/div, permits extended breakdown measurements on a device under
test(DUT). A step generator produces voltage or current setups of either polarity
for application to the base or emitter terminal. The step generator may also be
operated in a pulsed mode to reduce DUT power dissipation.
In addition to conventional curve tracer performance, the 370B includes the
following features:
Digital storage capability that allows a bright and stable display and cursor
merriments. The 370B has a mass storage system that consists of non–vola-
tile IC memory and a 3.5 inch floppy disk drive. UP to 64 families of
characteristic curves and front panel setups can be stored on disk. And up to
9 families of characteristic curves and front panel setups can be stored in in
internal non–volatile IC memory. The stored characteristic curves can be
recalled for additional analysis and comparison.

Getting Started
1-2 370B User Manual
Two extended acquisition modes: Averaging and Envelope. Averaging
reduces display noise in high sensitivity ranges. Envelope mode displays the
maximum and minimum vertical or horizontal excursion of each curve,
which is useful for detecting long–term variations such as thermal drift.
Nearly all front panel functions can be controlled via GPIB. (Controls
intended for manual operation, such as INTENSITY, FOCUS, GRAT
ILLUM etc, are the only exception.) Also, curve data can be sent, or
received, from an external controller through the GPIB
Other features include an auxiliary voltage supply, cursor measurement
readout, and diagnostic routines.
This instrument was thoroughly inspected for mechanical and electrical defects
before shipment. It should be free of marks or scratches and meet or exceed all
electrical specifications. To confirm this, inspect the instrument for physical
damage incurred in transit and test the electrical performance by following the
First Time Operation instructions on page 3–3. For a complete verification of
instrument performance refer a qualified service technician to the Performance
Check section of the Service Manual. If a discrepancy is found, contact your
local Tektronix Field Office or representative.
This instrument operates from a power source having a neutral or near ground
(earth) potential. It is not intended for operation from two phases of a multi–
phase system, nor across legs of a single phase, three wire system. This
instrument can be operated from either a 115 volt or 230 volt nominal supply
source, 48 to 63 Hz. Table 1–1 is a listing of the line voltage ranges, line
frequency range, and power consumption.
Table 1-1: Line vol age ranges
RANGE swi ch NOMINAL swi ch
   
          
          
Power consumption
     !
      !
Ins alla ion
Ini ial Inspec ion
Power source informa ion

Getting Started
370B User Manual 1-3
The LINE VOLTAGE SELECTOR switches (NOMINAL and RANGE, located
on the rear panel) allow selection of the operating line voltage. To select the
correct operating line voltage:
1. Disconnect the 370B from the ac power source before changing the operating
voltage.
2. Select the nominal ac power source voltage with the NOMINAL switch,and
3. Select the operating line voltage with the RANGE switch.
 To prevent damage to the instrument ,always check the settings of the
LINE VOLTAGE SELECTOR switches lactate on the rear panel the 370B before
connecting the instrument to the line voltage source.
To verify that the power input fuse is for the nominal sc source voltage se-
lected,perform the following:
1. Use the small straight screwdriver to pry the cap (with the attached fuse
inside)out of the fuse holder.
2. verify proper fuse value:
Nominal voltage 230 V 2 A medium blow
Nominal voltage 115 V 4 A medium blow
3. Install the proper fuse and reinstall the fuse holder cap.
A power cord with the appropriate plug configuration is supplied with each
instrument . The color coding of the power cord conductors appears in Table1–2.
Also, should you require a power cord plug other than that supplied, refer to
Table 1–3. Power Cord Identification.
Table 1-2: Power Cord Color Conduc or Iden ifica ion
Conduc or Color Al erna e
  
   
      
Opera ing Vol age
Selec ion and Line Fuse
verifica ion
Power Cord Informa ion

Getting Started
1-4 370B User Manual
Table 1-3: Power cord identification
Plug configuration Normal usage Option number
  
 
 
!
 

  
 

! 
 

" #
 


 

 "  ! 

Getting Started
370B User Manual 1-5
 This instrument operates from a single phase power source,and has a
detachable three–wire power cord with a two–pole, three–terminal grounding
type plug. The voltage to ground (earth) from either pole of the power source
must not exceed the maximum rated operating voltage (250 volts rms).
before making connection to the power source, make sure that the instrument is
set for the power source voltage, and is equipped with a suitable plug(two–pole,
three–terminal,grounding type).
This instrument is safety class 1 equipment (IEC* designation). All accessible
conductive parts are directly connected through the grounding conductor of the
power cord to the grounding contact of the power plug. Therefore, the power
plug must only be inserted in a mating receptacle with a grounding contact. Do
not defeat the grounding connection. Any interruption of the grounding
connection can create an electric shock hazard.
For electric shock protection,connect the instrument to ground before connecting
to the instrument input or output terminals.
*International Electrotechnical Commission.
The 370B can be operated where the ambient air temperature is between +10 C
and +40 C. After storage at temperatures outside the operating limits, allow the
chassis temperature to reach the safe operating limits before applying power. The
370B is cooled by air drawn in through the air filter on the rear panel and blown
out through holes in the side panels. For proper instrument cooling, provide
adequate clearance on the rear and sides of the instrument to ensure free air flow
and dissipation of heat away from the instrument.
 Following use of the 370B at high power settings, the device,
fixture,or protective cover may be hot enough to cause injury. Avoid touching any
of these items until cooled.
Operating Temperature

Getting Started
1-6 370B User Manual
To use the370B to display and measure the characteristic curves of most
devices,a test adapter and the protective cover must be installed. Three test
adapters are provided as standard accessories. Five other test adapters are
available as optional accessories. The test adapter is inserted into the adapter
connectors provided on the front panel. These connectors allow two devices to
be set up at a time.
 Dangerous voltage may appear at the front panel collector and base
terminals. To avoid injury or equipment damage, do not remove the protective
cover.
 Double–wide test adapters are designed to fit in the left set of adapter
connectors. If you try to forcibly install a double–wide test adapter in the right
side, you might damage the connector. The connectors are identified by the
following numbers:
A1006
A1007
A1009
A1010
Test adapter and
Protective cover