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MKS Ophir Nova User Manual

MKS Ophir Nova User Manual

Laser power/energy meter
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  • Page 1 Nova Nova Laser Power/Energy Meter User Manual Ophir Optronics Solutions Ltd. www.ophiropt.com/photonics...

  • Page 2: Table Of Contents

    Table of Contents Chapter 1 Introduction: How to Use This Manual........4 Chapter 2 Quick Reference................5 Getting Started................5 Thermal Heads................7 2.2.1 Use of Nova with thermal type heads........7 2.2.2 Setting and Saving Startup Configuration.........8 2.2.3 Power or Single Shot Energy Measurement ......8 Photodiode Heads...............10 2.3.1 Use of Nova with photodiode type heads .......10...
  • Page 3 Setting up the PD300 and 3A-IS to display the user's chosen wavelengths.................43 Startup Defaults................44 Selecting Settings from the Nova Screen.......45 5.4.1 To Set to the Laser Wavelength Being Used......45 5.4.2 To choose Manual or Automatic Ranging or dBm....45 5.4.3 Operation with Filter In or Out ...........47 5.4.4 Zoom....................48 5.4.5...
  • Page 4 Error Messages ................84 Troubleshooting................84 8.5.1 Nova Display ................84 8.5.2 Thermal Heads, Energy Measurements ........85 8.5.3 Thermal Heads, Power ...............85 8.5.4 Pyroelectric Heads ..............86 Maintenance................86 8.6.1 Maintenance of Thermal Heads ..........86 8.6.2 Replacing Battery................88 Chapter 9 Nova Specifications ..............89 System/Display Specifications ..........89 Head Specifications..............90...

  • Page 5: Chapter 1 Introduction: How To Use This Manual

    Chapter 1 Introduction: How to Use This Manual The Ophir Nova is a microprocessor-based Laser Power/Energy Meter providing a broad range of measurements, displays, and data handling options. It operates with thermopile, pyroelectric and photodiode heads, and uses smart connector technology. Just connecting the head configures and calibrates the instrument.

  • Page 6: Chapter 2 Quick Reference

    Chapter 2 Quick Reference 2.1 Getting Started The Nova is equipped with "soft keys." That is, the functions of the keys change as indicated by the legend above each key. (See Figure 2). When the Nova is first switched on, the first screen usually has a digital display with a bargraph at the bottom.
  • Page 7 To switch the Nova on: 1. Push up the slide switch on the left side of the Nova display. (See Figure 2). Figure 2. Nova Top View The unit will switch on, and the display will appear. Note: The head must be plugged in before the unit is switched on.

  • Page 8: Thermal Heads

    To zero instrument: 1. Disconnect head, turn off then on again. "Head Disconnected" will be displayed. 2. Press "select" until "zero" is highlighted. 3. Press "go". 4. Make sure instrument is not in an electrically noisy environment and is undisturbed. Press "go" and wait for message, "zeroing completed".

  • Page 9: Setting And Saving Startup Configuration

    To choose power or energy measurement: 1. To go from the bargraph power measurement screen to the energy measurement screen, press the menu button then press "energy". 2. Alternatively, you can press the leftmost soft key directly from the bargraph screen to go to energy measurement.
  • Page 10 To use the Nova to measure Laser power: 1. Verify that the display shows power units in W, mW etc. 2. If the display shows energy units of J, mJ etc. then press "power" to switch to the power measurement mode. To expand the bargraph scale ±10% about the present reading: 1.

  • Page 11: Photodiode Heads

    2. The energy mode is manual ranging. Press "range" then the "up" "down" soft keys until the proper range is highlighted then press "exit". The correct range is the lowest one that is larger than the pulse energy measured. 3. When the Nova screen flashes "ready," on and off, fire the laser.

  • Page 12: Selecting Chosen Wavelength

    2.3.2 Selecting Chosen Wavelength 1. From the power measurement mode, press the menu button until "more" appears. Press "more". 2. Press "select" until "wavelength" is highlighted. Press "go". 3. Press "change" then "up" and "down" to select the first wavelength. Repeat steps 2 and 3 for other wavelengths desired.

  • Page 13: Pyroelectric And Photodiode Energy Heads

    Alternatively press the center button from the bargraph screen without the menu button. 2. Press "zoom" again to return to full scale. To offset current reading and set to zero: 1. From the bargraph power measurement screen press the menu button, press "offset" then press menu twice to return to the bargraph screen.

  • Page 14: To Set Type Of Laser Being Used

    2.4.2 To set type of laser being used 1. From bargraph measurement screen, press the menu button twice and press "laser" until the correct laser type or wavelength is displayed. 2. Return to bargraph screen by pressing the menu button again. 2.4.3 To set Laser Pulse and Average 1.

  • Page 15: Setting Up Pe-Dif Diffuser Heads To Diffuser In Or Out Setting

    5. Press "select" and "value" to choose the pulse length you wish to be the default. 6. Now press "select" and "value" again to choose the default energy range. 7. Press "exit" then "all" to save. For further details on configuration See Sections 6.2 and 6.3 2.4.5 Setting up PE-DIF diffuser heads to diffuser IN or OUT setting...
  • Page 16 You can also obtain this slide from your dealer. You should use this slide to test the damage threshold with your laser pulses. If the slide is damaged, then either enlarge your beam or lower the laser energy until damage is no longer seen. 2.4.6.1 To choose Energy or Average 1.
  • Page 17 2.4.6.4 To expand the bargraph scale fivefold about the present reading 1. From the bargraph energy or power measurement screen press the menu button then press "zoom", then press the menu button twice, or just press the center button from the bargraph screen. 2.

  • Page 18: Chapter 3 The Nova Display Unit

    Chapter 3 The Nova Display Unit 3.1 General Description The model Nova laser power/energy meter represents a new level of sophistication, sensitivity, compactness and accuracy, coupled with ease of operation. It can operate with thermal, pyroelectric and photodiode heads. It has smart connector technology. Simply plugging in the head configures and calibrates the Nova to operate with that head.

  • Page 19: Smart Connectors And Multihead Operation

    3.2 Smart Connectors and Multihead Operation The Nova display, although very compact, is versatile and can operate with either thermal, pyroelectric or photodiode type laser measuring heads. The head configuration and calibration information is stored in an EEROM in the head connector plug. This means that when the head is plugged in, the Nova automatically identifies the head type, calibration and configuration.

  • Page 20: Soft Keys

    Note: The first set of menu choices can be accessed without pressing "menu". Simply pressing the appropriate key from the bargraph screen will operate that key even though the label is not visible. So if you remember the position of the key you can take a shortcut.

  • Page 21: Power Up And Shut Down

    Figure 4 3.4 Power Up and Shut Down To turn the Nova on: 1. Push up the slide switch on the left side of the Nova display. (See Figure 4) 2. The unit will switch on, and the display will appear. If no head is connected, a display showing "Head Disconnected"...

  • Page 22: Nova Functions Which Are Independent Of Head Type

    3.5 Nova Functions which are independent of Head Type When no head is connected to the Nova and it is turned on, the message "Head Disconnected" appears. In this mode, the user can adjust either the power line frequency so the instrument can be adjusted for minimum interference at the power line frequency, or the user can zero the instrument to eliminate any offsets.

  • Page 23: Baud Rate

    Note for Thermal Heads only: For best results with thermal heads, it may be necessary to do the procedure once with the head disconnected then afterwards again with the head connected. After completing steps 1 - 5 above, Connect the head and make sure it is at room temperature and well shielded from any stray thermal power.

  • Page 24: Kickstand

    The electroluminescent backlight does have a finite lifetime of about 10,000 hours. Therefore, it is recommended only to use it when necessary. To turn on the backlight, push the push button while the charger is connected. To turn off the backlight, push the button again.

  • Page 25: Chart Recording

    3.9 Chart Recording The instrument provides an analog voltage output via a 2.5mm pin jack labeled "AN OUT" on the rear panel (See figure 3). This is useful for driving chart recorders and other analog devices. The voltage is proportional to the reading on the display and scaled such that full scale equals 1.00 volts.
  • Page 26 5. If you want to have the Nova come up in the normal measurement screen, reverse process in steps 1 and 2. Note 1: The factory default for this screen is 100.00% and in that case, the regular screen comes up on startup and not the attenuator screen.

  • Page 27: Chapter 4 Operation With Thermopile Absorber Heads

    Chapter 4 Operation with Thermopile Absorber Heads Warning: Before using the head for power or energy measurement, check that your laser power, energy and energy density do not exceed the head ratings. tables section Head Specifications. If the head is a water-cooled type, ensure that the cooling water is flowing at an adequate rate;...

  • Page 28: Selecting Settings From The Nova Screen

    The display unit amplifies this signal and indicates the power level received by the head. At the same time, signal processing software causes the display unit to respond faster than the thermal rise time of the detector disc, thus reducing the response time of the Nova.

  • Page 29: To Choose Manual Or Automatic Ranging In Power Measurement

    4.2.2 To choose Manual or Automatic Ranging in Power Measurement: Autorange - The Nova allows you to choose autorange or manual ranging. In autorange mode, you do not have to change scales. When the reading of the meter or bar is more than 100% of full scale, the range goes to the next higher one.

  • Page 30: To Choose Power Or Energy Measurement

    4.2.3 To choose Power or Energy Measurement The Nova thermopile heads can measure both power and single shot energy. See sections 4.4. and 4.5. for details. To change from power to energy measurement or vice versa do the following: 1. To go from the bargraph power measurement screen power to energy measurement, press the menu button then press "energy".

  • Page 31: Power Measurement

    5. Press "select" and "value" to choose the manual power range you wish to be the default or autorange. The Nova will now be in the mode selected when switched on with the head in question. 6. Now press "select" and "value" again to choose the default energy range.

  • Page 32: Advanced Power Measurement Features

    4.4.2 Advanced Power Measurement Features The following section describes additional Nova functions in power mode in addition to the basic power measurement mode described above. 4.4.2.1 Zoom The Zoom function causes the scale to expand the present scale fivefold. Thus, if the full scale of the bargraph is 20 watts, and your reading is 15 watts, pressing "zoom"...
  • Page 33 Now press the menu key again to return to the bargraph screen. The Nova will now read zero, and the 0.1 Watt background will be subtracted from all subsequent readings. The laser power reading will thus be 20.4 Watts. When "offset" is engaged, the legend is highlighted. To cancel, press "offset"...
  • Page 34 To use the Nova to fine tune laser power: 1. From the bargraph power measurement screen press the menu button twice then press "more". 2. Press "select" until "tune" is highlighted. Press "go". 3. Press the menu button once to make legends visible.
  • Page 35 4. Now press select until the minimum setting is highlighted. Press "select" until minimum value on graph is chosen. 5. Press "select" again and then use "value" to choose the desired horizontal time scale. Press "go". The measurement will begin immediately. 6.
  • Page 36 The Nova allows two modes of averaging: "continuous" or "periodic" mode. The periodic mode is meant for lasers which have rapid power fluctuations. In this case, choose an averaging period from .33 to 30s. The Nova averages over each period and displays the result at the end of each period until the next average arrives.
  • Page 37 For instance, if your original laser power is 100 Watts, and you have split off 5% of the power, i.e. 5 Watts and are measuring only the 5 Watts, you can display the nonsplit value with the attenuation screen. To do so, do the following: 1.

  • Page 38: Energy Measurement

    4.5 Energy Measurement 4.5.1 Setup Switch the Nova on. If it is in power mode, press the menu button once to make the legends visible and then press the left soft key "energy" to put it into energy mode. Alternately, if you remember the position, you can press the left soft key without pressing the mode button first.

  • Page 39: Minimum Energy Threshold

    4.5.3 Minimum Energy Threshold If the Nova is used in a noisy environment or where there is a high level of background thermal radiation, the instrument may trigger spuriously on the noise or background radiation. It would then fail to measure the intended pulse.

  • Page 40: Measuring Pulses Of Very Low Energy

    Note (to users of 3A-P type heads): The 3A-P type head has special circuitry enabling it to trigger on energy pulses of very low energy. This is accomplished by a special photodiode trigger which alerts the Nova that a pulse has been received and to start integration. This allows the 3A-P to react to smaller pulses than would be measurable just by triggering on the rising thermal signal as in other heads.

  • Page 41: Measuring Energy Of Rapidly Repeating Pulses

    2. A train of a known number of pulses may be fired, and the total energy measured in "energy" mode. This train should not exceed 5 seconds duration. The energy per pulse can be calculated by: Energy per pulse = Total Energy / Number of Pulses In both of the above methods, the pulse repetition rate must exceed 3Hz.
  • Page 42 An RS232 interface can be purchased to attach to a PC and then the data points can be transferred to PC either in real time or after storage. Contact your Ophir representative for details. To use the Nova for graphical display of energy: 1.

  • Page 43: Chapter 5 Operation With Photodiode Type Heads

    Chapter 5 Operation with Photodiode Type Heads Warning: Before using the head for power or energy measurement, check that your laser power or energy and energy density does not exceed the head ratings. See table 6. 5.1 Photodiode Heads When a photon source, such as laser, is directed at one of the PD300, 3A-IS or BC20 series photodiode detectors, a current is created proportional to the light intensity and dependent on the wavelength.

  • Page 44: Setting Up The Pd300 And 3A-Is To Display The User's Chosen Wavelengths

    The PD300 saturates when the output current exceeds 1.3mA so the exact maximum power depends on the sensitivity of the detector at the wavelength used. When saturated the legend "SAT" will appear on the screen. Table 2 gives the actual maximum power as a function of wavelength.

  • Page 45: Startup Defaults

    1. From the power measurement mode with the bargraph display, press the menu button located on the right side until "more" appears. Press "more". 2. Press "select" until "wavelength" is highlighted. Press "go". 3. Press "change" then "up" and "down" to select the first wavelength desired.

  • Page 46: Selecting Settings From The Nova Screen

    5.4 Selecting Settings from the Nova Screen The Nova can conveniently be set to various chosen parameters from the screen. In addition these settings can be saved as startup defaults so the head will be in the desired configuration when turned on. 5.4.1 To Set to the Laser Wavelength Being Used Photodiode heads have a different sensitivity at different wavelengths.
  • Page 47 Manual Range - There are certain disadvantages to autorange since it changes scale even if you don't want it to do so. If you want to measure the same range all the time, it is better to use manual range. The correct range to select is the lowest one which is larger than the largest expected measurement.

  • Page 48: Operation With Filter In Or Out

    2. Now make your second measurement and the value of the difference in dB = ratio in numerical units will be shown. Note: If there is a zero offset in the reference value, you cannot subtract this using the DBOFST function. Instead, before the start of the measurement, go into a numerical scale, press “offset”...

  • Page 49: Zoom

    To choose the filter setting: 1. From the bargraph measurement screen press the menu button twice. 2. Press "filter" . 3. If you wish to work with filter installed, press "change" until display says "filter is in". Be sure to install removable filter on detector head.

  • Page 50: Offset

    5.4.5 Offset The PD300, PD300-3W and BC20 heads have automatic background subtraction as described in Section 5.1. In addition, the offset function can be used to subtract the residual background signal which remains if desired. If the Nova shows a nonzero power reading even when there is no laser, you can subtract the background using the zero function.

  • Page 51: Average And Measuring Very Low Power Measurement

    The Nova also has the option of graphing the laser power vs. time, or successive energy points as long as the Nova has not been turned off. While measurements are being taken, the Nova will record data until the screen is full, or "reset" or "exit" is pressed.

  • Page 52: General Description

    5.5.1 General Description Model BC20 scanned beam laser power meter has become the industry standard for measuring scanned laser beams as well as hard to reach static beams. The BC20 smart head has built into its smart plug innovative circuitry to measure scanned as well as static beams of up to 20 milliwatts with a noise level of microwatts.

  • Page 53: Spectral Response

    3. Set up the startup defaults and choose “continuous” if you want continuous readings or “hold” if you want readings to be held for 5s before updating. (See section 5.5.2 above). 4. Hold the wand so the beam strikes the detector vertically.

  • Page 54: Pd300-Cie Photometer Head

    Note: Because the BB heads are spectrally flat, wavelength selection is disabled. Other than that, operation is the same as other PD300 type heads. 5.6.2 PD300-CIE Photometer Head The PD300-CIE head has a spectral response similar to that of human eye and can therefore make measurements in eye response units of Lux.

  • Page 55: Chapter 6 Operation With Pyroelectric And Photodiode Energy Heads

    Chapter 6 Operation with Pyroelectric and Photodiode Energy Heads Warning: Before using the head for power or energy measurement, check that your laser power, energy or energy density do not exceed the head ratings as listed in the table with the head specifications.

  • Page 56: Selecting Settings From The Nova Screen

    The photodiode based PD10 head also uses the same circuitry but can measure much lower energies due to the sensitivity of the photodiode. 6.2 Selecting Settings from the Nova Screen The Nova can conveniently be set to various chosen parameters from the screen. In addition, it can be set to startup defaults so it will be in the desired configuration when turned on.

  • Page 57: Setup Of Laser Pulse Length And Pulses / Sample

    6.2.2 Setup of Laser Pulse Length and Pulses / Sample 6.2.2.1 Laser Pulse Length As was mentioned before, the Ophir pyroelectric heads can measure long as well as short pulses. In order to do this, the user must indicate to the Nova if the laser pulses are going to be longer or shorter than the maximum wavelength in the short pulse mode.
  • Page 58 However, at high repetition rates, the display can capture the pulses at rates not exceeding 15Hz. The Nova samples individual pulses at a rate of 15Hz from the laser pulse train. Thus if the user has a laser pulsing at over 15Hz and wishes to average over a number of pulses, the average will be over the number of pulses processed by the Nova and not over those...
  • Page 59 The PD10 operates in a similar fashion to the PE head except that it has one extra function. When measuring very low energies, the head will also be sensitive to background light and therefore show a spuriously high reading. Therefore we have added a function to measure the background light.

  • Page 60: Startup And Configuration Of Defaults

    6.3 Startup and Configuration of Defaults If you are planning to do repetitive measurements most of the time, you can set up the Nova so that it automatically goes into the measurement mode you want upon startup. Since these desired settings are saved in the head "smart connector", you can save different settings for different heads.

  • Page 61: Energy, Power Or Exposure Measurement

    6.4 Energy, Power or Exposure Measurement Warning: Before using the head for power or energy measurement, check that your laser energy, energy density and average power do not exceed the head ratings as listed in the table with the head specifications at the end of the manual, otherwise, there is a risk of damaging the absorber.
  • Page 62 How to set up for pulse energy measurement is described below. 1. Make sure the instrument is in the bargraph energy measurement mode indicated by the fiducial marks at the bottom of the screen and the units of mJ, µJ, etc. If it is in power measurement mode with units of mW, W etc, then press the left soft key or alternatively, press the menu button and then the left "energy"...
  • Page 63 The Nova is now ready to measure energy pulses. The energy reading will operate in the following manner if "none" selected as the averaging period, following every 1/15th of a second period, the Nova will display on the screen the next pulse which arrives. The Nova will hold the display of the latest pulse until a new one arrives.

  • Page 64: Zoom

    The correct range is the lowest one that is larger than the highest energy being measured. Note that the proper range is related to the pulse energy even though we are measuring average power. 3. Press exit then press the menu button twice to return to the bargraph measurement screen.

  • Page 65: Pyro Scope Adapter

    In order to measure exposure, do the following: 1. Press the menu button until "more" appears. Press "more". 2. Press "select" until "exposure" is highlighted. Press "go". 3. Setup the desired measurement parameters in the setup screen and press "go". 4.

  • Page 66: Measuring Repeating Pulses Of High Energy

    Activate the scope adapter as follows: 1. Plug the adapter into the Nova display and then plug the head plug into the adapter. Plug the BNC connector into a standard 1MΩ scope input. 2. Press the menu button twice and then press ‘more”.

  • Page 67: Energy Log

    Contact your Ophir dealer for details. 6.6 Energy Log This is the same as for thermal heads, except you do not have to wait for "reset", See section 4.5.6.

  • Page 68: Chapter 7 Circuit Description

    Chapter 7 Circuit Description The NOVA has three circuit boards: an analog processor, a digital processor and a power supply. Analog Processor: The signal from the detector head enters the analog processor board and passes through EMI protection components differential transimpedance preamplifier.
  • Page 69 Power Supply: The power supply board, which also holds the display module and the keypad switches, provides the internal DC voltages for the analog and digital processors. It also contains the battery charging circuit and the AC supply for the backlight. All of the power supplies operate in switch mode with an oscillator frequency of 32KHz.

  • Page 70: Chapter 8 Calibration, Maintenance And Troubleshooting

    Chapter 8 Calibration, Maintenance and Troubleshooting 8.1 Calibration of Thermopile Heads 8.1.1 Absorber types and Method of Calibration of Ophir Power Meters 8.1.1.1 Types of Ophir Laser Absorbers Two types of absorber surface are used in Ophir thermal measuring heads. 1.
  • Page 71 2. Volume absorbers P (pulse) type absorber: The models with the P suffix, for use with pulsed lasers, have a special absorbing glass with an absorbance of 95 +2% over the operating range. Since the surface is a glass, its reflectivity does not change even if damaged or melted locally.
  • Page 72 Percent absorption Wavelength, µm BB therm. Percent absorption Wavelength, µm Graph 1. Absorption of Ophir Thermal Absorbers vs. Wavelength...

  • Page 73: Linearity And Accuracy Of Ophir Thermal Heads

    8.1.1.2 Method of Calibration The absorption of the various Ophir thermal absorbers can vary from disc to disc. Therefore, all Ophir absorbers are individually calibrated against NIST traceable standards. Ophir power/energy meters with the broadband or P type absorbers are individually calibrated by laser at several wavelengths against a NIST calibrated standard meter.

  • Page 74: Calibration Factor

    The test is performed with a high power laser that can cover the entire detector range using a rear leak detector for comparison. This rear leak detector is a low power Ophir detector which has previously been tested for linearity. Thus, in all cases, the linearity of the detectors is traceable to electrical standards.

  • Page 75: Recalibration Of Thermopil Heads Using The Nova

    8.1.4 Recalibration of Thermopil Heads Using the Nova If your measuring head is equipped with the exclusive Ophir CAL resistor then calibration is performed according to the instructions in Section 8.1.4.2. If you do not have the CAL resistor, then you can recalibrate from a known source of power or energy following the instructions in Section 8.1.4.3.
  • Page 76 2. Use the resistor for calibration only. 3. Turn off the power as soon as calibration is done. 4. Do not operate the calibration resistor when the sensor disc is under radiation; the excessive heat may burn out the calibration resistor. 5.
  • Page 77 8. The voltage should be measured at the input to the head and the current in series with the current loop. 9. Press go and adjust up/down until the power reading on the screen reads the (voltage in volts) x (current in amps) x (current calibration factor for your model and laser or as shown on Nova).

  • Page 78: Calibration Of Photodiode Type Heads

    Note 1: For units which have different calibration factors, e.g. CO2, YAG, or VISIBLE, press "laser" to select correct type of laser before calibration. When recalibrating using "power with laser:" function, only the calibration of the chosen laser wavelength will change. If you wish to change the calibration of all wavelengths proportionately, then use the function "power with CAL".

  • Page 79: Accuracy Of Calibration Of Pd300 And 3A-Is Heads

    8.2.2 Accuracy of Calibration of PD300 and 3A-IS Heads Since the instruments are calibrated against NIST standards, the accuracy is generally ±2% at the wavelength the calibration has been performed. The maximum error in measurement will be less than the sum of the calibration accuracy, linearity, inaccuracy due to errors in the wavelength curve and variations in gain with temperature.

  • Page 80: Recalibration Of Pd300 And 3A-Is Heads From A Known Source Of Laser Power

    Since the instruments are calibrated against NIST standards, the accuracy is generally ±2% at the wavelength the calibration has been performed. The maximum error in measurement will be less than the sum of the calibration accuracy and linearity The linearity of the photodiode detector is extremely high and errors due to this factor can be ignored.

  • Page 81: Recalibration Of Bc20 Heads From A Known Source Of Laser Power

    8.2.5 Recalibration of BC20 heads from a Known Source of Laser Power 1. Set to the proper manual power or energy range. 2. From the bargraph power screen press the menu button twice and press "more. Now press select till "calibrate" is highlighted. Press "go". 3.

  • Page 82: Method Of Calibration

    3. High speed broadband type: The type with the BBH suffix has a special broadband coating spectrally flat from 190nm to 3µm. Unlike the BB type, it is able to work at high repetition rates to 1000Hz. On the other hand, its damage threshold is considerably lower, on the order of 0.05J/cm².

  • Page 83: Accuracy Of Calibration

    The spectral absorption of the detector coating is measured spectroscopically and the absorption curve is used to correct the calibration for other wavelengths. When the user selects his wavelength on the Nova, the correction factor for that wavelength is applied. The PD10 heads are calibrated in a two step fashion.

  • Page 84: Recalibration From A Known Source Of Laser Energy

    Coating Type Wavelength Broadband Metallic PD10 ERROR 190 - 350nm ±1% ±4% 400 - 800nm ±1% ±4% 1064nm 1-1.5µm ±1% ±2% N.A. 2 - 3µm ±2% ±8% N.A. 10.6µm ±5% ±15% N.A. Table 5. Additional Measurement Error due to Wavelength 8.3.3 Recalibration from a Known Source of Laser Energy 1.

  • Page 85: Error Messages

    8.4 Error Messages The Nova displays various error messages when operated outside its normal range: Over-range: When the power or energy being measured exceeds the range of the measurement scale being used, the over-range message is displayed, but the reading still appears on the display. If the power or energy exceeds the maximum by more than 10%, the reading on the display is blanked.

  • Page 86: Thermal Heads, Energy Measurements

    8.5.2 Thermal Heads, Energy Measurements Problem Cause/Remedy Instrument triggers on Increase threshold background noise or level; See Section. sometimes fails to 4.5.3. catch large pulse. Instrument does not Increase threshold show ready for a long level; See Section 4.5.3. while after a reading is made.

  • Page 87: Pyroelectric Heads

    8.5.4 Pyroelectric Heads Problem Cause/Remedy 1. Instrument reads Possible electromagnetic incorrectly or interference from pulsing erratically. laser is causing misreading Especially on and/or false triggering. sensitive scale. Check the following: 2. Instrument triggers 1. Head is mounted to stand even without being using insulated plastic rod exposed to laser provided with instrument,...
  • Page 88 It has been calibrated at the wavelength requested, or for the 3 wavelengths listed. If it is a CAL type disc, a CAL Factor is also included to use for electrical calibration checks on your power/energy meter. Please follow the following steps in disc replacement. 1.

  • Page 89: Replacing Battery

    From the bargraph power measurement screen, press the menu button twice and press "more". Press "select" until "calibrate" is highlighted. Press "go". Now press "power with laser". Use the "laser" button to select one of the laser wavelengths. Press "go" and adjust until the cal factor is the same as that sent with the disc for the wavelength shown.

  • Page 90: Chapter 9 Nova Specifications

    Chapter 9 Nova Specifications 9.1 System/Display Specifications Detector Compatibility Thermopile, photodiode pyroelectric, OEM Input ranges 15nA - 1.5mA full scale in 16 ranges A to D Sampling rate 15Hz A to D resolution 17 bits plus sign. (0.0007% resolution) Electrical accuracy ±0.25% ±...

  • Page 91: Head Specifications

    9.2 Head Specifications HEAD MAX AVG. ABSORB POWER POWER (WATTS) DENSITY TYPE PD300/UV/I 300mW 50W/cm² PD300-3W 50W/cm² 3A-IS 200W/cm² Int Sph PD F100A-IS 100W 200W/cm² Int Sph Ther 200W/cm² 3A-P-CAL 50W/cm² 10A-P 50W/cm² 30A-P 50W/cm² 30(150)A- 30(150)W 1000W/cm² HE/HE1 20KW/cm² 20KW/cm²...

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