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ETS-Lindgren
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HI-2790B
User Manual
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ETS-Lindgren HI-2790B User Manual

HI-2790B
Calibration Comparison System
User Manual
ii
ETS-Lindgren Inc. reserves the right to make changes to any products herein to improve
Revision
Description
Date
A
Initial Release
February, 2001
B
Updated Power/Control Module information; branding changes
June, 2008 C
Minor edits/updates
June, 2011
D
Minor edits to tables in Operation
October, 2014
functioning or design. Although the information in this document has been carefully reviewed and is believed to be reliable, ETS-Lindgren does not assume any liability arising out of the application or use of any product or circuit described herein; nor does it convey any license under its patent rights nor the rights of others. All trademarks are the property of their respective owners.
© Copyright 2001–2014 by ETS-Lindgren Inc. All Rights Reserved. No part of this document may be copied by any means without written permission from ETS-Lindgren Inc.
Trademarks used in this document: The ETS-Lindgren logo is a trademark of ETS-Lindgren Inc.
Revision Record
MANUAL, HI-2790B | Part # H-600092, Rev. D
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iii
Table of Contents
Notes, Cautions, and Warnings ................................................ v
General Safety Considerations ................................................ v
1.0 Introduction .......................................................................... 7
General Description .................................................................................... 7
HI-2790B Calibration Comparison System Block Diagram .................. 8
ETS-Lindgren Product Information Bulletin ................................................. 9
2.0 Maintenance ....................................................................... 11
Replacing the Fuse ................................................................................... 11
Service Procedures .................................................................................. 12
Contacting ETS-Lindgren .................................................................. 12
Sending a Component for Service..................................................... 12
Calibration Services and Annual Calibration...................................... 12
3.0 Setup ................................................................................... 13
Connecting Components .......................................................................... 13
4.0 Operation ............................................................................ 15
Description of Controls .............................................................................. 15
Operation of Controls ................................................................................ 16
Error Messages ........................................................................................ 18
Establishing a Reference Field.................................................................. 19
Recording Data ......................................................................................... 21
Microwave Oven Survey Instrument Daily Ellipticity Check ....................... 22
Microwave Oven Survey Meter Calibration Comparison, 30-Day Check,
Initial Conditions ....................................................................................... 22
Calibration Comparison ............................................................................ 23
30-Day Comparison Requirements ........................................................... 24
5.0 Calibration Comparison Log 30-Day Check .................... 25
6.0 Calibration Comparison Log 2 dB Limitation Check ..... 29
7.0 HI-2790B Operational Log ................................................. 33
8.0 CDRH Section 8 Report Guidelines ................................. 35
8.1 Microwave Test Instruments (Type and Quantity) ............................... 35
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8.2 Daily Check......................................................................................... 35
8.3 30-Day Constancy Check ................................................................... 36
8.4 Repair of Survey and Calibration Instruments ..................................... 37
8.5 Annual Calibration and Periodic Calibration ........................................ 37
9.0 Specifications ..................................................................... 39
Appendix A: Warranty ............................................................. 41
Duration of Warranties .............................................................................. 41
Appendix B: Declaration of Conformity ................................ 43
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v

Notes, Cautions, and Warnings

Note: Denotes helpful information intended to provide tips for better
use of the product.
Caution: Denotes a hazard. Failure to follow instructions could result in minor personal injury and/or property damage. Included text gives proper procedures.
Warning: Denotes a hazard. Failure to follow instructions could result in SEVERE personal injury and/or property damage. Included text gives proper procedures.
Note: See the ETS-Lindgren Product Information Bulletin for safety,
regulatory, and other product marking information.
Warning: For indoor use only, do not expose to rain..
Note: See the ETS-Lindgren Product Information Bulletin for safety,
regulatory, and other product marking information.

General Safety Considerations

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Introduction
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Note: The HI-2790B system replaces the HI-2790A and HI-2795A Calibration Comparison Systems. The HI-2790B system offers a broader, continuous power range from 0.1 to more than 5 mW/cm2. The internal microwave (2.45 GHz) power source offers a more stable RF signal to the test chamber. The HI-2790B Power/Control Module has a single mains input operating from 100 to 240 VAC, 50/60 Hz.

1.0 Introduction

The ETS-Lindgren HI-2790B Calibration Comparison System is an instrument calibration comparison system that can be used by microwave oven manufacturers to comply with the Center for Devices and Radiological Health (CDRH) requirements as outlined in Guide for Preparing Reports on Radiation Safety of Microwave Ovens, dated March 1985. The HI-2790B is a complete system containing all of the equipment necessary to check microwave oven survey instruments and monitor the calibration stability of these instruments. This involves checking each instrument periodically to make sure that its response is within specification, and its calibration remains constant. This must not be confused with performance of absolute calibration or transfer calibration on the instrument.
In addition to defining a standard format for data, the information provided in this manual is intended to guide the oven manufacturer in establishing procedures for using the HI-2790B system to generate information for reporting to the U.S. Food and Drug Administration, Department of Health and Human Services, Center for Devices and Radiological Health.

General Description

The HI-2790B system consists of:
A portable anechoic chamber mounted on a frame with castor wheels
for ease of movement.
A Power/Control Module containing a crystal-controlled 2450 MHz
solid state source and a power meter for monitoring power to the waveguide and forward, reflected, and transmitted power.
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Introduction
Note: For maximum accuracy and traceability, the HI-1710 LCR and the HI-2623 Probe/Preamp Assembly must be used together as a single unit. The HI-2623 assembly should not be used for general oven leakage testing or any other purpose.
An HI-1710 Microwave Survey Meter to serve as a Local Calibration
Reference (HI-1710 LCR).
The HI-1710 LCR and the HI-2790B Power/Control Module are mounted on top of the cabinet toward the rear edge. The Power/Control Module is connected directly to the waveguide through a coax cable assembly. The waveguide penetrates the chamber and terminates in a slot antenna radiating toward the probe holding fixture. The fixture is mounted in the wall directly opposite the slot antenna.
The probe holding fixture is slotted so that the probe can be inserted into the chamber without removing the probe spacer cone. The fixture allows the probe under test to be rotated 360 degrees, but has adequate friction to limit axial motion. A fixture mounted on a horizontal cross-member in the chamber accurately maintains the spacing of the probe sensing head to the slot antenna.

HI-2790B CALIBRATION COMPARISON SYSTEM BLOCK DIAGRAM

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Introduction
9

ETS-Lindgren Product Information Bulletin

See the ETS-Lindgren Product Information Bulletin included with your shipment for the following:
Warranty information  Safety, regulatory, and other product marking information  Steps to receive your shipment  Steps to return a component for service  ETS-Lindgren calibration service  ETS-Lindgren contact information
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Introduction
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Maintenance
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CAUTION: Before performing any maintenance, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment.
WARRANTY
WARNING: Maintenance of the HI-2790B and HI-1710 LCR is limited to external components such as cables or connectors.
Clean the exterior of the cabinet using a damp cloth and mild cleaner. Always unplug the unit before cleaning. Keep the interior of the cabinet free of any foreign objects.
Warranty may be void if the housing is opened.
If you have any questions concerning maintenance, contact ETS-Lindgren Customer Service.
Caution: Disconnect the HI-2790B and HI-1710 from power before replacing a fuse.

2.0 Maintenance

Replacing the Fuse

If the HI-2790B Calibration Comparison System or HI-1710 Microwave Survey Meter (HI-1710 LCR) fails to operate, check for a blown fuse inside the power entry module. A blown fuse must be replaced with the same value and type of fuse, or an unsafe condition may result. Use only 250 Volt, 1.0 Amp, Type T (5 mm x 20 mm) fuses.
To replace a fuse:
1. Two fuses are located in the fuse drawer in the power input module. Use a screwdriver to open the drawer.
2. The fuse towards the outside of the drawer is the spare. Remove the spare fuse from the module.
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Maintenance
Note: Please see www.ets-lindgren.com for a list of ETS-Lindgren offices, including phone and email contact information.
3. Replace the blown fuse with the spare fuse.
4. Slide the fuse drawer back into the module. Make sure that the drawer
snaps securely into its locked position.

Service Procedures

CONTACTING ETS-LINDGREN

SENDING A COMPONENT FOR SERVICE

For the steps to return a system or system component to ETS-Lindgren for service, see the Product Information Bulletin included with your shipment.

CALIBRATION SERVICES AND ANNUAL CALIBRATION

See the Product Information Bulletin included with your shipment for information on ETS-Lindgren calibration services.
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Setup
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CAUTION: Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment.
Note: Some models of the HI-1710 LCR provide a voltage setting
switch at the power input to select 115 or 220 VAC input voltage.

3.0 Setup

Connecting Components

See HI-2790B Calibration Comparison System Block Diagram on page 8 for a description of connections.
1. Connect the HI-2790B Power/Control Module and the HI-1710 Microwave Survey Meter (HI-1710 LCR) to the mains power supply.
2. Plug the IN connection port on the flexible coax cable assembly into the RF output connector on the HI-2790B Power/Control Module.
3. Plug the RF coax cable into the input connector on the waveguide.
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Setup
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