Download
Share
Print this page
  1. Manuals
  2. Brands
  3. OptoTest Manuals
  4. Measuring Instruments
  5. OP940-SW
  6. Instruction manual

OptoTest OP940-SW Instruction Manual

Multichannel insertion loss & return loss meter
Hide thumbs

Advertisement

Quick Links

Download this manual
OP940-SW
Multichannel
Insertion Loss & Return Loss Meter
Instruction Manual
www.optotest.com
1.805.987.1700

Advertisement

loading
Need help?

Need help?

Do you have a question about the OP940-SW and is the answer not in the manual?

Questions and answers

Related Manuals for OptoTest OP940-SW

Summary of Contents for OptoTest OP940-SW

  • Page 1 OP940-SW Multichannel Insertion Loss & Return Loss Meter Instruction Manual www.optotest.com 1.805.987.1700...
  • Page 2 The design concepts and engineering details embodied in this manual, which are the property of OptoTest Corporation, are to be maintained in strict confidence. No element or detail of this manual is to be spuriously used or disclosed without the express written permission of OptoTest Corporation.
  • Page 3 OP940-SW Table of Contents Overview Initial Preparation Unpacking and Inspection Damaged In Shipment Standard Contents Front Panel Connector Warming Up Definition of Specifications Nomenclature How to Navigate the User Interface Mode Select Screen Operation Mode Screens Front Panel Operation OPM Mode...
  • Page 4 Help, and the ability to measure return loss on both ends of a DUT through the front panel. The OP940 uses the USB interface to communicate and be driven by OptoTest software which further integrates the unit into a highly efficient production line.
  • Page 5 Note: Be aware that accessories such as detector adapters, remote head detectors, and high performance reference cables will be located inside a small box labeled “Accessories Inside”. If this box is not included with the original shipment, contact OptoTest of their nearest distributor.
  • Page 6 OP940-SW Notice Concerning Front Panel Connector It is advised by OptoTest that the user connects a short SAVer cable to the front panel. This cable must be angle polished on both ends and can range from 0.4m in length to 3m in length.

  • Page 7: Definition Of Specifications

    OP940-SW Definition of Specifications Dynamic Range The dynamic range, or measurement range, of the optical power meter spans from the maximal power level the instrument can measure, without major saturation to the detector, to the minimal power level where the thermal noise of the detector becomes greater than the current produced by the incident light.
  • Page 8 The absolute accuracy specification includes the total measurement uncertainties involved in the calibration process including the transfer of the absolute power standard from N.I.S.T. Contact OptoTest for the detailed chain of uncertainties. Optical Power Meter, Channel Performance For multichannel instruments, the power meter circuit converts and digitizes the optical power level with the given sampling interval.
  • Page 9 OP940-SW Definition of Specifications Recommended Recalibration Period This is the recommended time period for re-calibration in order to maintain accurate specifications. The recommendation is made based upon statistics on detector aging; however it is up to the metrology policies and procedures within each company to define the calibration cycles on optical power meters.
  • Page 10 OP940-SW Definition of Specifications Reference Cable The reference cable is the cable with which the DUTs will be measured against. Typically reference cables are required to be of a defined quality with a specified connector/ endface polish. Instrument, Environmental Operating Temperature: This is the temperature range in which the instrument will conform to the specifications after the specified warm up time.
  • Page 11 OP940-SW Nomenclature LCD Color Display Control Buttons Remote Source Home Button Head Por t (BNC) Connectors REMOTE HEAD PORT OP940 IL/RL Test System Removeable Removable Feet Source Panels Power Button Remote (Keyed) Head Detector 10 of 49...
  • Page 12 OP940-SW How to Navigate the User Interface At startup, the unit will load the mode which has been selected as the Startup Mode in the Settings screen. To change mode screens, press the H button and the unit will transition to the Mode Select screen.
  • Page 13 OP940-SW How to Navigate the User Interface Page 2 Page 3 Page 2 Displays Insertion Loss and Return Loss measurements for one wavelength at a time. Both measurement types can be referenced from this screen as well Displays Insertion Loss and Return Loss measurements for two wavelengths at a time.
  • Page 14 OP940-SW How to Navigate the User Interface Operation Mode Screens When the unit is in one of its operation screens, the buttons will operate largely the same. Buttons , and will select options such as reference cycles and wavelength/ channel switching. Button will cycle through the pages of these procedures and options before wrapping back to the first page.
  • Page 15 OP940-SW Front Panel Operation OPM Mode This mode controls the optical power meter on the unit, but not the source. OPM mode supports all the functions of a state-of-the-art optical power meter such as multiple wavelength calibrations, absolute mode (dBm), and relative mode (dB).
  • Page 16 OP940-SW Front Panel Operation Page 1 Page 2 Page 1 Changes the selected wavelength for the power meter Switches the display between absolute (dBm) and relative (dB) measurement modes. The active mode will be in yellow Performs a measurement of the current optical power and stores it.
  • Page 17 OP940-SW Front Panel Operation IL Mode IL mode is designed to measure insertion loss for one or two wavelengths at one time, while allowing the user to toggle between any of the source wavelengths. It also allows the quick referencing of both wavelengths (for example 1310nm and 1550nm) and consecutive measuring of insertion loss on components at both wavelengths.
  • Page 18 OP940-SW Front Panel Operation RL Mode RL mode is designed to measure return loss for two wavelengths at one time. It allows for quick referencing of two wavelengths and simultaneous measuring of return loss of reflective events at both wavelengths. Additionally one also has the ability to reference to and measure return loss of the second connector of the DUT.
  • Page 19 OP940-SW Front Panel Operation ILRL Mode ILRL mode is designed to measure insertion loss and return loss for one wavelength simultaneously. It allows the quick referencing of both IL and RL and will display live results for both measurements at one wavelength. IL measurements will be displayed as positive values.
  • Page 20 OP940-SW Front Panel Operation Dual ILRL Mode Dual ILRL mode is designed to measure insertion loss and return loss for two wavelengths simultaneously. It allows the quick referencing of both IL and RL and will display live results for both measurements at two wavelengths. IL measurements will be displayed as positive values.
  • Page 21 OP940-SW Front Panel Operation Scan Mode Scan mode creates OTDR-style scans as a means of diagnosing problems with insertion loss and return loss reference and measurement. The unit can perform an individual scan or continuously scan a distance of 20m at a time. This mode is not intended to be used...
  • Page 22 OP940-SW Front Panel Operation Page 1 Page 1 Changes the selected wavelength for the scan Switches the “gain stage” of the return loss meter. The higher the number, the more sensitive the meter is to detect smaller reflections and the more a large reflection will saturate the meter Switches the return loss source from high-power to low-power.
  • Page 23 OP940-SW Front Panel Operation Page 2 Page 3 Page 2 Performs a single scan of displayed range Moves the displayed range “forward” by 10m Moves the displayed range “backward” by 10m Displays on-screen context help for this mode screen Advances to the next page of options...
  • Page 24 OP940-SW Front Panel Operation Scan Mode – Using the OP725 When operated in Bidirectional Mode (see page 32), Scan Mode’s screens change to accommodate the addition of a feature. All other functionality remains intact. NOTE: When operating the OP725 | OP940 tandem in Bidirectional Mode, all operations to control the OP725 must be done through the OP940 and not using the front panel controls of the OP725.
  • Page 25 OP940-SW Front Panel Operation IL Ref The IL Ref screen is designed specifically to reference insertion loss and will run inside of other mode screens, such as IL, ILRL, and Dual ILRL. References performed will be globally applied. Page 1...
  • Page 26 OP940-SW Front Panel Operation RL Ref The RL Ref screen is designed specifically to reference return loss and apply temporary adjustments to the return loss reference. It will run inside of other mode screens, such as RL, ILRL, and Dual ILRL. References performed in this screen will be globally applied, except for the case of position 2 in RL Mode.
  • Page 27 OP940-SW Front Panel Operation Settings Mode The Settings Mode is designed to allow the user to configure certain parameters for the unit including pass/fail criteria and startup mode. The buttons will operate identically to Mode Select screen in the root Settings screen in...
  • Page 28 OP940-SW Front Panel Operation Below is a brief description of the operation modes on each page of the Mode Select Screen. Page 1 Page 2 Page 1 IL Pass Threshold is a wavelength-specific setting which controls the pass/fail criteria for insertion loss measurements through the front panel display.
  • Page 29 OP940-SW Front Panel Operation Page 3 Page 4 Page 3 Scan Offset is a global setting which controls where the unit begins referencing for return loss. This is useful if one needs to reference past optical components DUT Length is a global setting which allows the operator...
  • Page 30 OP940-SW Front Panel Operation Status Mode The Status Mode is a troubleshooting tool which displays the state of the various user- configurable settings on the OP940. It can also be used to quickly check the unit’s settings before beginning to test. The settings, which are displayed on this screen, are as follows:...
  • Page 31 OP940-SW Front Panel Operation Multichannel Units On multichannel versions of the OP940, most mode screens function largely the same. However, some additional functions will be added to the second screen to make the unit switch channels manually. Page 2 1310 1550 Threshold: 0.20 dB...
  • Page 32 OP940-SW Front Panel Operation Multichannel Units On the RL Ref screen, there is another added feature, which allows the operator to copy the return loss information to all other channels. This feature is useful when testing using cables of equal length and when using fanout cables as reference cables. It can be...
  • Page 33 OP940-SW Front Panel Operation Bidirectional Functionality – OP725 Overview On single channel OP940s, the user has the option to control an OP725-2x2 to perform bidirectional measurements through the front panel. When operating in this mode, most mode screens will function largely the same as with the standard configuration, but some additional functions will be added to allow the unit to measure bidirectionally and appropriately store the reference values.
  • Page 34 OP940-SW Example 1: Referencing and Measuring Return Loss To take the reference for a return loss measurement, connect the reference cable from the source directly to the detector port of the instrument. Input Select the desired mode screen, such as ILRL, and then select the RL Ref option.
  • Page 35 OP940-SW Example 1 (cont.): Referencing and Measuring Return Loss If the reference is good, the OP940 will display the reference distance and RL value, and the progress bar will turn yellow. Typical RL values are -14dB for an open UPC connector.
  • Page 36 OP940-SW Example 1 (cont.): Referencing and Measuring Return Loss The unit will begin displaying live return loss results. From the measurement screen, press the Pass/Fail Button to display live test results based on the user-configurable settings. Additionally, if insertion loss needs to be referenced, simply select the IL Ref option from the measurement screen.
  • Page 37 OP940-SW Example 2: Referencing Return Loss with APC Reference Cables If the reference cable is APC-terminated, use a short APC-to-PC cable to reference RL. Input Alternatively, utilize the APC Reference option. Once this option is selected, simply press the Start RL Ref button.
  • Page 38 OP940-SW Example 3: Referencing and Measuring Insertion Loss To take the reference for an insertion loss measurement, connect the reference cable from the source directly to the detector port of the instrument. Input Select the desired mode screen, such as ILRL, and then select the IL Ref option.
  • Page 39 OP940-SW Example 3 (cont.): Referencing and Measuring Insertion Loss The unit will begin displaying live insertion loss results. From the measurement screen, press the Pass/Fail Button to display live test results based on the user-configurable settings. Additionally, if return loss needs to be referenced, simply select the RL Ref option from the measurement screen.
  • Page 40 OP940-SW Example 4: Referencing Bidirectional IL and RL with an OP725 Connect the cables as below, leaving the reference connectors disconnected. Reference return loss as in Example 1 (page 33). On the second screen of options in RL Ref mode, select the feature to change the direction of the OP725.
  • Page 41 OP940-SW Example 4 (cont.): Referencing Bidirectional IL and RL with an OP725 On the second screen of options in IL Ref mode, select the feature to change the direction of the OP725. Then repeat the IL reference for the B A direction.
  • Page 42 OP940-SW Example 5: Performing OTDR-style trace in Scan Mode If problems arise during testing of insertion loss or return loss, it can often be helpful to diagnose the problem by using Scan Mode. From the measurement mode where the problems are arising, navigate to the Mode Select screen by pressing the Home button.
  • Page 43 OP940-SW Example 5 (cont.): Performing OTDR-style trace in Scan Mode If the scan is saturating while in High mode, switch back to Low mode for a more accurate scan. Conversely, if no reflection is seen in Low mode, try switching it over to High mode to see if that causes a peak to appear.
  • Page 44 OP940-SW Example 5 (cont.): Performing OTDR-style trace in Scan Mode Press Run and adjust the cable setup until the reflection is adequately corrected (Pressing “Run” will disable all other buttons). This can involve disconnecting mated cables to scope endfaces for damage and dirt, or to interchange mating adapters or even swapping in different reference cables.

  • Page 45: Troubleshooting

    OP940-SW Troubleshooting If, in the course of testing, an OptoTest OP940 unit begins to experience issues, please consult the below table for basic troubleshooting help. If after consulting the table the unit is still having issues, contact OptoTest for further assistance.
  • Page 46 20dB of power. APC connector on By default, OptoTest units require a large reflection to reference return loss. Using one of a few different Return Loss...
  • Page 47 OP940-SW Troubleshooting (cont.) Problem Possible Cause Solution Large reflections If there is a reflection of magnitude 60dB or greater in front of the within 2-4 meters of the connection under test, connection under test the unit could potentially be unable to accurately determine the magnitude of the reflection.
  • Page 48 OP940-SW Removing the Source Panel for Repolishing When the APC connector on the source port of the OP940 becomes damaged, it will interfere with the IL and RL measurements. Often, simply repolishing this connector is enough to fix any measurement issues.
  • Page 49 OP940-SW Removing the Source Panel for Repolishing (cont.) Unscrew the FC/APC connector from the source bulkhead and repolish as needed. Once the connector has been repaired, turn the unit on and navigate to Scan mode and verify that there is no noticeable reflection at the front panel.
  • Page 50 OP940-SW Warranty Information See our Terms and Conditions at www.optotest.com for warranty information. NOTE: Do not send instruments for any reason without contacting OptoTest headquarters first. To request an RMA contact OptoTest at +1.805.987.1700 or customerservice@optotest.com. 49 of 49...
  • Page 51 For Application Notes, more detailed Testing Instructions, and the most up-to-date OptoTest www.optobuzz.com News go to...
  • Page 52 1.805.987.1700...