How it Works
ETS-Lindgren
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HI-1710
User Manual
61 pgs1.6 Mb1

ETS-Lindgren HI-1710 User Manual

HI-1710
Microwave Measurement System
User's Manual
Copyright
Manual #600032 2/00 $25.00
2000 by Holaday Industries, Inc.
©
Revision Record
Manual #600032
HI-1710 Microwave Measurement System
Revision Description Date
G Reformatted 2/00
TABLE OF CONTENTS
1.0 DESCRIPTION ....................... 1
Introduction ........................ 1
2.0 HInn1710 SPECIFICATIONS ............. 3
Error Analysis ....................... 4
Calibration ......................... 5
3.0 ACCEPTANCE ...................... 5
Introduction ........................ 5
Unpacking and Acceptance ............. 5
4.0 OPERATIONS ....................... 9
Start Up ........................... 9
Front Panel Settings ................. 10
Default Settings .................... 10
Range ........................... 11
Filter ............................ 12
Peak Hold ........................ 13
Alarm Set ........................ 16
Zero ............................ 16
Over Range ....................... 17
Shift Functions ..................... 17
Bias ......................... 17
Offset ....................... 18
Reset ........................ 18
Power Supply .................. 18
3/4 Digit ...................... 18
Set Baud Rate .................. 18
Stim ........................ 18
Using the HI-1710 ................... 19
Analog Outout ..................... 20
Digital (RS-232) Input/Output ........... 21
Error Messages ..................... 26
Connection and Operation of the RS-232
Serial Data Port ..................... 27
5.0 THEORY OF OPERATION .............. 35
6.0 TEST AND TROUBLESHOOTING ......... 41
Error Codes ....................... 41
Checks and Adjustments .............. 43
Chip Revisions ..................... 45
Replacement Parts ................... 46
APPENDIX A
RS-232 Command Set ................ 49
APPENDIX B
RS-232 Connections ................. 51
APPENDIX C
Zero Receptacle .................... 53
Limited Warranty
Holaday Industries, Inc. warrants each model HIn1710 Microwave Measurement System to be free from defects in material and workmanship for a period of one year from the date of shipment to the purchaser. This warranty extends to the original purchaser only, and does not apply to the batteries or to any products or parts subject to misuse, neglect, accident, unauthorized service or abnormal conditions of operation.
In the event an instrument covered by this warranty fails, Holaday Industries, Inc. will, without charge, repair and recalibrate the instrument if returned to their factory within one year of the original purchase-provided that Holaday Industries' examination discloses, to its satisfaction, that the product is defective. Holaday Industries, Inc., may, at its option, replace the product in lieu of repair. If the defect was caused by misuse, neglect, accident, unauthorized service or abnormal conditions of operation, repairs will be billed at a nominal cost. In such cases, an estimate will be provided before work is started, if requested by the purchaser.
For warranty service, contact Holaday Industries, Inc. Provide the serial number of the instrument and complete details regarding the failure mode. You will then be given either service information or shipping instructions. Return the instrument to the factory, transportation prepaid. Repairs will be made at the factory and the instrument will be returned to you, transportation prepaid. Holaday Industries, Inc., assumes no responsibility for loss of, or damage to, products in transit.
Warning!
EXTREME CAUTION IS ADVISED WHEN WORKING IN ENVIRONMENTS WHERE HIGH-INTENSITY ELECTROMAGNETIC FIELDS MAY EXIST AND WHERE CONTACT WITH HIGH VOLTAGE OR HIGH CURRENT CIRCUITS OR APPARATUS IS POSSIBLE. ACCIDENTAL CONTACT WITH OBJECTS OR CIRCUITS OPERATING AT HIGH VOLTAGES OR HIGH CURRENTS CAN BE LETHAL! HOLADAY INDUSTRIES, INC. ASSUMES NO LIABILITY FOR ANY DAMAGES OR PERSONAL INJURY WHICH MAY RESULT FROM
HIn1710 Manual Page — 1
1.0 DESCRIPTION
Introduction
The HI-1710 Microwave Measurement System is designed to operate from standard 50/60 Hz. 115 or 230 VAC power. The circuitry is powered by a regulated supply with normal industrial transient protection devices. The push button power switch located on the front panel of the instrument turns the instrument on and off. The instrument provides four different time response characteristics which allows standard hand scan measurements according to CDRH Performance Standard for Microwave Ovens, CFR 1030.10 as well as the potential for faster scanning similar to that of automated scanning systems. The instrument is calibrated for measurement in the 2450 MHz ISM band only. The instrument is shielded with the necessary isolating and attenuating devices to provide immunity to stray leakage of microwave energy.
The diode detection array of eight hot carrier diodes is housed in the large end of the plastic probe assembly. This antenna array has the unique feature of being able to sum microwave electric fields of any plane perpendicular to the axis of the probe. The antenna lobe is also very broad, making the instrument easy to use when measuring leakage around an oven door. The cone spacer is designed to provide 5 cm spacing (as required by the CDRH performance standard) from the tip of the probe cone to the center of the array. The shape of the cone provides minimum perturbation of the electric field impinging on the diode array. The probe is attached permanently to the pre-amplifier assembly by a 9 foot shielded cable. Each detection probe and amplifier assembly is calibrated as a unit and can be used interchangeable with any HI-1710 Readout. The digital
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indicator reads with two or three decimal place resolution from zero to 10 mW/cm2. Temporary over-exposure to microwave fields up to 2000 mW/cm2 will not cause probe burn-out or damage the instrument or its calibration. Four ranges with full scale indications of 1, 2, 5, and 10 mW/cm2 or auto-range can be selected from the front panel. With the instrument set to auto-range, the microprocessor controller will select the best range for each measuring condition. Selecting the range, determines the full scale setting of the bar graph display located below the digital readout to give a continuous analog indication of the leakage level being measured. The audio alarm circuit can be set to any level up to 10 mW/cm2. Whenever the level of the microwave leakage exceeds the preselected value, the audio alarm will sound, alerting the operator that the chosen level has been exceeded.
HIn1710 Manual Page — 3
2.0 HInn1710 SPECIFICATIONS
1. Calibrated at 2450 MHz. for use in the ISM band.
2. Four ranges: 0-1, 0-2, 0-5, 0-10 mW/cm2.
3. Response Characteristics (0 to 90% of final value
for step input):
F1 - 1.2 seconds (2 stage Butterworth filter, Fc =
0.5 Hz.)
F2 - Less than 0.5 second (2 stage Butterworth filter, Fc = 0.5 Hz.)
F3 - Four Pole Butterworth filter, Fc = 0.45 Hz.
F4 - Four Pole Butterworth filter, Fc = 0.90 Hz.
4. Maximum Power Density 2.0 Watts/cm2 (2000
mW/cm2)
5. Power: 115/230 VAC 50-60 Hz. (switch
selectable)
6. Operating Temperature: 15/ - 40/ Celsius
7. Dimensions: 11 x 8 x 6.5 high
(280x204x165mm)
8. Probe Length: 12 inches (305 mm)
Cable Length: 9 feet (2.74 meters)
9. Shipping weight: 15 pounds (6.8 KG)
Page — 4 HIn1710 Manual
Error Analysis
1.0 mW/cm
Absolute Calibration
+0.30 dB
Precision ±0.13
Linearity and AM response ±0.15
Frequency Response
1
±0.04
Near field response ±0.29
Polarization
1
±0.21
Pattern +0/-0.11
Temperature +0.46/-0.15
Supply Voltage ±0.01
1
RFI
±0.01
2
Overload ±0.01
1
Drift
±0.04 ________________
-1.098/+1.498
dB
note 1: values are combined in an RMS manner
HIn1710 Manual Page — 5
Calibration
Each Probe/preamp assembly is calibrated by placing the probe in a known 2450 MHz field. Calibration is performed at a standard temperature of 75 degrees Fahrenheit in an anechoic chamber, utilizing a slot radiator. A CW field is generated using a crystal controlled solid state source. The power monitoring system is the HI-2795 Calibration Comparison System. The calibration field level is established using a reference survey meter with CDRH calibration correction factors. All ranges are calibrated at mid-scale.
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HIn1710 Manual Page — 7
3.0 ACCEPTANCE
Introduction
This section contains information on unpacking and acceptance of the HIn1710.
Unpacking and Acceptance
Step 1. Upon delivery of your order, inspect the
shipping container(s) for evidence of damage. Record any damage on the delivery receipt before signing. In case of concealed damage or loss, retain the packing materials for inspection by the carrier.
Step 2. Remove the instrument from its shipping
containers. Save the boxes and any protective packing materials for future use.
Step 3. Check all materials against the packing list to
verify that the equipment received matches that which was ordered. If you find any discrepancies, note them and call Holaday Customer Service (952-934-4920) for further instructions.
Be sure that you are satisfied with the contents of your order and the condition of your equipment before installing the instrument.
Page — 8 HIn1710 Manual
HIn1710 Manual Page — 9
4.0 OPERATION
Start Up
(The instrument should not be used without spacer cone in place.)
1. Insert the probe/preamp tube into the receptacle in
the HI-1710 front panel with the power OFF. The preamp tube must be oriented with the locating screw facing up. Be sure that the pins are securely mated with the socket in the instrument front panel. Note that the preamp tube is inserted into the probe opening such that the indicator arrow on the brass tube is aligned with the edge of the grounding ring.
2. Check that the input voltage select switch (located
on the rear panel of the unit) is set to the proper voltage level. Connect theinstrumentto the AC supply line.
3. Power is applied to the system by depressing the
power switch located in the upper right corner of the instrument front panel. When the power is first turned on, the microprocessor performs a series of self-tests on the measuring circuitry of the meter. Refer to section 6.0 (Test and Trouble Shooting) for more information. When the initial tests are complete, the system is in its default mode and ready for operation.
4. Check the spacer cone for damage, discoloration, or
contamination. Accuracy will be affected by cone wear or damage or by contamination by metallic particles which may become imbedded in the cone. Replace the cone if necessary. Replace the cone only with a Holaday Industries replacement cone for
Page — 10 HIn1710 Manual
continued accuracy.
Front Panel Settings Refer to figure 1
Figure 1
HI-1710 Front Panel
Default Settings
When the instrument is turned on, the instrument is initialized to pre-determined default settings. The instrument can be used for normal production line testing with the default settings. The ALARM SET POINT is saved in Battery Backed RAM and will return to its preset value each time the instrument is turned on or reset. This value is initially set near the top of the operating range during factory testing. The RS-232 serial port baud rate setting is also saved in RAM. Its initial value is set to 1200 baud during factory testing.
HIn1710 Manual Page — 11
Default Settings:
Peak Hold - OFF Filter - FILTER 1 (Slow) Range - 0-1 mW/cm² Display - Two Decimal Places
Range
The HI-1710 can be set to any one of four ranges by pressing either of the range select switches. The range affects only the Bar Graph Display and the Analog Output; the digital display will always indicate any value between zero and 10 mW/cm2. Pressing the right range switch (>) changes the instrument to the next higher range; each depression of the switch moves one range. Pressing the left range switch moves the range downward.
Moving one step beyond range four (10 mW/cm2 full scale), sets the instrument to AUTO-RANGE. In this mode, the instrument adjusts the range automatically for the best reading. With no RF input, the instrument will shift to the 0-1 mW/cm2 scale. When the displayed value exceeds 95% of full scale, the instrument automatically selects the next higher scale. While the digital reading will always indicate any value up to 10 mW/cm2, the Bar Graph display will change to reflect the correct percentage of the newly selected range. In auto-range, when the displayed value drops below 30% of full scale, the instrument selects the next lower range.
Note: When using the Auto-Range feature and Peak Hold together, the highest range selected is locked in. This is because the peak segment on the Bar Graph display is located as a proportion of the highest auto-selected range. When the instrument is zeroed, the auto-range
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will reset to the lowest range (1 mW/cm2).
The range selection switches feature wrap-around operation which means that when the instrument is in its lowest range and the left or lower range (<) switch is pressed, the instrument will move to the auto-range setting. When the instrument is in auto-range and the right or increase range switch (>) is pressed, the instrument will move to the 1 mW/cm2 setting.
Filter
The HI-1710 is internally programmed with four response times (filters). This digital filtering changes the way the instrument responds to rapidly changing RF or leakage levels. Refer to section 5.0 (Theory of Operation). Filters are selected by pressing the right or left filter select switches located beneath the filter selection indicating LEDs on the front panel.
Filter 1 is equivalent to the "SLOW" response mode on analog meters. This is the default setting and is the setting used for most hand scanning of microwave ovens. This setting responds more slowly to rapidly changing RF or leakage levels and tends to average the response to peak levels caused by oven mode stirring devices. This response characteristic is designed to meet the CDRH requirement that an instrument respond to a step CW microwave input to 90% of its steady state reading within a maximum of three seconds while still providing maximum smoothing of RF peaks.
Filter 2 is equivalent to the "FAST" response mode on analog meters. The filter selection is used for observing rapid variations in RF leakage and evaluating the effect of stirrer modulation on leakage.
HIn1710 Manual Page — 13
Filter 3 is a four stage, eight pole filter designed for faster scanning of ovens having slow mode stirrer speeds in a manner similar to that used by Automatic Microwave Oven Scanning Systems (AMOSS). Special test procedures are required to use this filter for compliance testing.
Filter 4 is a four stage, eight pole filter designed for faster scanning of ovens having faster mode stirrer speeds in a manner similar to that used by Automatic Microwave Oven Scanning Systems (AMOSS). Special test procedures are required to use this filter for compliance testing.
Note: Use of Filters 3 and 4 would require the development and submission of a revised compliance plan with CDRH. Such a plan would need to show an error analysis of sample data comparing the proposed scan rate with current CDRH testing guidelines. Contact Holaday Industries for further information.
Peak Hold
The Peak Hold function captures and holds the highest leakage reading displayed by the instrument. Peak Hold is activated by pushing the Peak Hold switch on the front panel. An LED indicator lights to show that the instrument is in the Peak Hold mode. The peak reading is stored as a digital value and displayed until the Zero switch is pushed to reset the instrument or until the probe is inserted into the optional Zero Chamber. The peak reading displayed is the value obtained following all filtering and signal conditioning.
While in Peak Hold, the analog Bar Graph display shows the current instantaneous RF reading, without filtering (refer to figure 2). A Bar Graph segment remains lit to
Page — 14 HIn1710 Manual
indicate the relative location of the peak reading on the digital display. The Bar Graph display responds very rapidly and will show stirrer/turntable modulation as well as minima and maxima of leakage around the microwave oven periphery. Because of the fast, unfiltered, response of the Bar Graph display, the digital peak reading may lag behind the Bar Graph indication depending on the filter factor chosen. When the instantaneous RF indication on the Bar Graph display is greater than the reading on the digital display, the Bar Graph segment proportional to the digital reading is dark. In this way the Peak Hold mode of the meter can be used to observe the effects of the various digital filters on fast changing RF inputs.
Bar Graph Display
Two end segments are always lit to define the scale.
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