Newport 1830-C Instruction Manual
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Newport 1830-C Instruction Manual

Optical power meter
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1830-C
Optical Power Meter
I
NSTRUCTION
M
ANUAL

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Summary of Contents for Newport 1830-C

  • Page 1 1830-C Optical Power Meter NSTRUCTION ANUAL...
  • Page 2 1830-C Optical Power Meter...

  • Page 3: Warranty

    Warranty Warranty Newport Corporation warrants this product to be free from defects in mate- rial and workmanship for a period of 1 year from the date of shipment. If found to be defective during the warranty period, the product will either be repaired or replaced at Newport’s option.

  • Page 4: Ec Declaration Of Conformity

    EC DECLARATION OF CONFORMITY Model 1830-C We declare that the accompanying product, identified with the " " mark, meets the intent of the Electromagnetic Compatibility Directive, 89/336/EEC and Low Voltage Directive 73/23/EEC. Compliance was demonstrated to the following specifications: EN50081-1 EMISSIONS:...

  • Page 5: Table Of Contents

    Table of Contents Warranty ........................ ii EC Declaration of Conformity ................iii List of Figures ...................... vii List of Tables ....................... vii Safety Symbols and Terms ................viii Definitions ......................ix Specifications ......................x Section 1 — General Information 1.1 System Overview ..................1 1.2 Scope of this Manual ................
  • Page 6 Section 4 — Performing Measurements 4.1 Introduction .................... 13 4.2 Photodetector Considerations ............. 13 4.2.1 Detector Calibration and Accuracy..........13 4.2.2 Quantum Detector Temperature Effects ........14 4.2.3 Ambient and Stray Light .............. 14 4.3 Setting the Wavelength ................15 4.4 Setting the Attenuator Mode ..............
  • Page 7 8.1 Introduction .................... 46 8.2 Obtaining Service ................... 46 Appendices Status Reporting System ............... 49 Sample Programs ..................52 Example Program for RS-232C Communication ....... 52 Example Program for IEEE 488 Communication ...... 55 Simplified 1830-C Functional Block Diagram ........58...
  • Page 8 RS-232C Cable Connections ..............22 RS-232C Baud Rate Selector Switches ..........23 GPIB Address Selector Switches ............25 The 1830-C’s Status Reporting System for the GPIB Bus ....49 Simplified Functional Block Diagram ........... 58 List of Tables Measurement Modes ................x 1830-C Display Annunciators/Messages ..........

  • Page 9: Safety Symbols And Terms

    42VDC or 42V peak AC. Do not exceed 42V between any portion of the Model 1830-C (or any attached detector or probe) and earth ground or a shock hazard will result.

  • Page 10: Definitions

    Definitions amps analog-to-digital converter standard coaxial connector type degree C degrees Centigrade Hertz (cycles per second) kilo (10 kilohertz kΩ kilo-ohms µ micro (10 milli (10 milliamps millivolts nano (10 nanoamps nanometers relative humidity serial number µA microamps µs microseconds volts watts...

  • Page 11: Specifications

    Specifications Dimensions: 3.7 x 7.5 x 9.0 in. (94 x 191 x 229 mm ) Weight: 5 lb ( 2.3 kg ) Enclosure: Metal case, painted Connectors: Calibration Module: 8-Pin Sub Mini DIN Analog Output: BNC RS-232: 9 pin D-Sub GPIB: 24 Conductor D 100-120, 220-240 VAC ±10%, 50/60 Hz Power :...
  • Page 12 Display Display Calculation Unit Comment ZERO Disabled ( I - I ZERO Enabled   / I R   ZERO Disabled     −   ZERO Enabled     10 log   ZERO Disabled ...

  • Page 14: Section 1 - General Information

    (LCD) and can also be taken remotely via the RS-232C port or the IEEE 488 GPIB bus. The 1830-C is designed to take continuous wave optical power measurements and is compatible with all of Newport’s Low-Power Semiconductor photodetectors. A family tree of the 1830-C compatible detectors and accessories is shown in Figure 1 below.

  • Page 15: Scope Of This Manual

    Scope of this Manual Please carefully read this instruction manual before using the 1830-C. Be especially careful to observe the warnings and cautions throughout this manual (see Safety Symbols and Terms). If any operating instructions are not clear, contact Newport Corporation.

  • Page 16: Section 2 - Initial Setup

    1830-C back panel to match the nominal local voltage. See Figure 2. Plug the AC line power cord to the rear of the 1830-C and then connect the cord to AC power.

  • Page 17: Detector Connection And Setup

    Insert the calibration module, with its groove facing left, into the connector port on the front panel of the 1830-C, as shown in Figure 4. An alignment pin assures the proper orienta- tion of the calibration module.

  • Page 18: Power Up / Auto-Calibration

    Power Up / Auto Calibration Turn on the 1830-C by depressing the red power switch, located in the lower left-hand corner of the front panel, until it clicks and remains in its depressed position. At power-up, the 1830-C will perform the following sequence:...

  • Page 19: Section 3 - System Operation

    The 1830-C has a large 4-1/2 digit, back-lit liquid crystal display (LCD) which can be seen at large angles of view. Figure 5 illustrates the layout of the 1830-C’s display. Table 2, on the following page, explains the meaning of the various annunciators and messages on the display.
  • Page 20 This level is detector dependent. This message indicates that the meter is currently performing an auto- calibration. The auto-calibration process involves measuring amplifier offset voltages. See Section 2.5 for more details. Table 2. 1830-C Display Annunciators/Messages...

  • Page 21: Front Panel Key Functions

    Front Panel Key Functions The front panel key pad of the 1830-C, Figure 6, provides access to all the basic measurement functions. Table 3 and Sections 3.3.1 through 3.3.14 list and describe in detail each key function. For power-up default conditions, please see Table 4 at the end of this section.

  • Page 22: Local (R/S) Local Mode & Run / Stop

    (LOCAL) 3.3.1 Local Mode R / S Run / Stop This key serves two purposes: 1) When the meter receives a command through either the RS-232C or the IEEE 488 GPIB interface, the meter is automatically put into remote mode and the REM annunciator is displayed. Now all front panel keys are disabled except this (LOCAL) key which, when pressed, puts the meter back into the local mode.

  • Page 23: Storef

    The detector calibration module contains responsivity data at discrete wavelengths for its associated detector. By entering the wavelength which is being measured, the correct responsivity value is used by the 1830-C in calculating the measured power. When a wavelength falls between two calibration points, linear interpolation is used to approximate the true responsivity value.

  • Page 24: Wavelength Decrement

    3.3.8 Power This key turns the power to the 1830-C on and off. To turn the meter on, depress the key until it clicks. To turn the meter off, press the key again until it clicks and rebounds to its original position.

  • Page 25: Range

    Default Meter Configuration Upon power-up or pressing the RESET button on the back of the meter, the 1830-C will configure itself as listed in Table 4. Keypad Function Default Power-Up Condition (LOCAL) Local Signal Acquisition is on.

  • Page 26: Section 4 - Performing Measurements

    This section describes detector and attenuator characteristics, optical and electrical considerations, and environmental influences on optical measure- ments. In general, the accuracy of measurement with the 1830-C is limited by the calibration accuracy of the detector calibration. Making accurate measurements of optical power is however, also dependent upon properly setting up the 1830-C, controlling temperature and illumination conditions, and understanding the factors that affect power measurement.

  • Page 27: 4.2.2 Quantum Detector Temperature Effects

    These dark currents can be zeroed at any moment in time via the ZERO key on the 1830-C. Since dark currents drift with temperature, the ZERO should be adjusted just prior to taking any measurements. The noise or drift in the dark current sets a lower bound on the measurement resolution which can be achieved with any given detector.

  • Page 28: Setting The Wavelength

    Setting the Attenuator Mode All Newport detectors are provided with calibrated optical attenuators. The responsivities for an attenuator/detector combination are stored in the calibration module. To measure optical powers above the saturation limit of the detector (see appropriate photodetector manual), use the optical attenuator that was shipped with your detector.

  • Page 29: Performing Basic Measurements

    Performing Basic Measurements 4.5.1 Power Measurements The 1830-C’s most basic measurement mode is in the units of Watts. Power measurements may be made with background correction, which is initiated by pressing the ZERO key. The following equation illustrates this relationship:...

  • Page 30: Logarithmic Measurements Using Reference Powers (Db)

    4.5.2.1 Logarithmic Measurements Using Reference Powers (dB) The dB measurement mode displays the absolute value of 10 times the logarithm (base 10) of the input power, referenced to a power level which is selected by pressing the STOREF key. The following equation illustrates this relationship: dB reading = 10 * log [Net Applied Power/Net Referenced Power(=STOREF)]...

  • Page 31: 4.5.3 Relative Measurements

    To make dBm measurements (relative to 1 mW optical power) with back- ground correction, proceed as follows: a. Select the dBm measurement mode, auto-range, and a wavelength. b. Block the light to be measured. c. Initiate background correction by pressing the ZERO key. Display should read approximately zero, but will fluctuate depending upon the variations in the amount of light reaching the detector and the detector dark current fluctuations.

  • Page 32: Common Measurement Errors

    Detector Saturation Check that the optical power density remains below the detector’s saturation threshold. Meter Configuration Check that the 1830-C was powered-up with the calibration module properly connected. Check that the optical attenuator mode (ATTN annunciator) is properly enabled/disabled. Table 5 — Common Measurement Errors...

  • Page 33: Section 5 - Computer Interfacing

    Section 5 Computer Interfacing Introduction The 1830-C has two computer interface ports: GPIB and RS-232C. The GPIB interface conforms with the IEEE 488.1 hardware standard. All commands for the 1830-C are device dependent commands. In this manual, we inter- changeably use either GPIB or IEEE 488 when referring to the IEEE 488 bus.

  • Page 34: Entering Remote Computer Interface Mode

    <SRQ> Service Request The 1830-C generates an <SRQ> to tell the GPIB controller that a serial poll is needed. Any device on the GPIB bus may assert the <SRQ> line. Bit 6 (decimal 64) will be high in the serial poll byte returned from a device requesting service.

  • Page 35: Rs-232C Communication

    RS-232C Communication Before communicating with 1830-C through the RS-232C port, proper cable connections must be made. Figure 7 shows the cable connections for communicating with the RS-232C port on the 1830-C. TO 1835 TO COMPUTER CABLE TERMINATORS (RS-232) 9 pin to 25 pin...

  • Page 36: 5.4.1 Setting The Baud Rate

    1830-C baud rate switch settings are changed. 5.4.2 RS-232C Command Termination: Commands and queries sent to the 1830-C through the RS-232C port must be terminated by a <LF> (line feed). All responses sent by the 1830-C are terminated with a <LF> (line feed).

  • Page 37: General Guidelines For Using The Rs-232C Port

    Quick Basic or C and lab automation software such as LabWindows and LabVIEW. • When a dumb terminal type of device is used to communicate with the 1830-C via the RS-232C, the echo mode is especially useful. When the “Echo Mode”...

  • Page 38: 5.5.2 Gpib Command Termination

    Figure 9. GPIB Address Selector Switches 5.5.2 GPIB Command Termination: Commands and queries sent to the 1830-C through the GPIB bus should be terminated by sending an <NL><EOI> (<NL> is equivalent to an <LF>). All responses sent by the 1830-C are terminated with the concurrent...

  • Page 39: General Guidelines For Using The Gpib Port

    • A query is a command that invokes a response from the 1830-C. All queries are terminated with a question mark (?). • Since the 1830-C’s output buffer size is limited to ten bytes, it is recom- mended that the response to a query be read before other commands are issued.

  • Page 40: Section 6 - Remote Command Set

    Section 6 Remote Command Set Summary of Command/Query Set The following commands and queries are case insensitive. No spaces are allowed between the letter-command and the parameter or question mark (?). Only one command/query allowed per bus transaction. Command Description Attenuator off Attenuator on Attenuator query ( returns: 0, 1 )
  • Page 41 Service Request Enable Register (Mask) Service Request Enable Register Query Auto-Calibration Status Byte Register Query ( returns: 0 – 255 ) Bits 7 6 5 4 3 2 1 0 Parameter Error Command Error Saturation (See Appendix A Over-Range for details) Message Available (MAV) Busy Service Request...

  • Page 42: Detailed Description Of Commands And Queries

    Type: integer Related Commands: A? – Attenuator query Attenuator query Function: Reports whether the 1830-C is using the responsitivity associated with the photodetector-alone or the photodetector-attenuator combination. Syntax: A? or a? Returns: 0 photodetector-alone responsitivities are used. 1 photodetector-attenuator responsitivities are used.

  • Page 43: Bn Beeper On/Off

    = 0 beeper is off n = 1 beeper is on Type: integer Related Commands: B?- Beeper query Beeper query Function: This query informs the user whether the 1830-C’s beeper is on or off. Syntax: B? or b? Parameter: none Returns: beeper is off.

  • Page 44: Data Query

    Un,U? - Set/Query the units of measurements Echo mode on/off ( RS-232C interface only) Function: This command is used to turn 1830-C’s echo mode on/off. The echo mode applies to RS-232C communication only. In this mode all the characters that are received over the RS-232C are transmitted (“echoed”) back to the user.

  • Page 45: Fn Filter ( Same As Averaging ) Slow, Medium, Fast

    This command is used to set how many measurements are averaged for the displayed reading. When the slow speed filter is selected, the 1830-C displays the average of the last 16 measurements. When using the medium filter, the 1830-C displays the average of the last 4 measurements. The fast filter does no averaging.

  • Page 46: Gn Go On/Off (Run/Stop Signal Acquistition)

    1830-C function. Syntax: Gn or gn Parameter: n = 0 1830-C is in Hold mode, i.e. does not take new readings n = 1 1830-C is in Go mode, i.e. takes new readings Type: integer...

  • Page 47: Kn Keypad / Display Backlight On/Off

    Related Commands: K? - Query the backlight intensity level Keypad/Display Backlight intensity level query Function: This query responds with the current status of 1830-C’s backlight intensity level. The backlight intensity level can be either off, medium, or high. Syntax: K? or k?

  • Page 48: Ln Local-Lockout On/Off

    Local lockout on/off Function: This command is used to enable/disable the 1830-C’s local- lockout function. When the local-lockout function is enabled, any front panel key presses would have no effect on system operation. The 1830-C’s front panel display has a “LLO”...

  • Page 49: Mn Service Request Enable Register (Mask)

    Request Enable Register, an <SRQ> will be generated once for the given event. When the <SRQ> is asserted and a serial poll of the 1830-C is performed, bit 6 and the bit(s) that initiated the <SRQ> will be set high in the byte returned by the serial poll.

  • Page 50: Service Request Enable Register Query

    Commands: Mn Service Request Enable Register Status Byte Register query Auto-Calibration Function: This command is used to calibrate the 1830-C for future measurements. The auto-calibration process involves mea- suring amplifier offset voltages which arise from aging and temperature effects. These offsets are then appropriately corrected for during normal operation.

  • Page 51: Status Byte Register Query

    Function: Reports the value of 1830-C’s status byte. This query informs the user about 1830-C’s current system status. All bits in the status byte register, except the MAV bit, can be cleared using the clear status command, C. See Appendix A for a detailed description of each bit and the Status Reporting System.

  • Page 52: Rn Range Setting

    : : : n = 8 Highest manual signal range (lowest amplifier gain) Type: integer Example: Selects auto-ranging for 1830-C . Selects the lowest signal range for 1830-C Selects the highest signal range for 1830-C Related Commands: R? - Range query...

  • Page 53: Range Query

    The lowest range for the geranium 818-IR detector is R3. Syntax: R? or r? Parameter: none Returns: indicates that the 1830-C is in the lowest signal range. indicates that the 1830-C is in the highest signal range. Example: Send: R? Resp: 1 1830-C is in the lowest signal range...

  • Page 54: Un Units

    Un or un Parameter: n = 1 1830-C measurement unit is Watts n = 2 1830-C measurement mode is in dB n = 3 1830-C measurement mode is in dBm n = 4 1830-C measurement mode is in REL Type:...

  • Page 55: Wnnnn Set Wavelength To Nnnn

    Wnnnn Set wavelength to nnnn Function: This command is used to set the wavelength of the input signal. 1830-C uses the responstivity value within the cali- bration module, corresponding to the wavelength selected, for it’s calculations. Syntax: Wnnnn or wnnnn...

  • Page 56: Zn Zero On/Off

    Turn the zero function on/off. Zero function is used for subtracting any background power levels from future mea- surements. When it is activated, the 1830-C uses the next power reading as it’s background value, and it subtracts this value from any future power readings.

  • Page 57: Section 7 - Troubleshooting And Maintenance

    The following troubleshooting guide is intended to isolate and solve prob- lems with the power meter so that, to the greatest extent possible, the return of the power meter/detector system to Newport will be unnecessary. For the problems that cannot be resolved with information in this manual, or for other situations that are not covered in this section, please call Newport’s...

  • Page 58: Cleaning Procedure

    Cleaning Procedure When cleaning the body of this instrument, use only a mild soap and water solution on a damp cloth. CAUTION Do not use acetone or other organic solvents on the 1830-C. Organic solvents attack the ABS plastic case.

  • Page 59: Re-Calibration Schedule

    Re-Calibration Schedule The 1830-C calibration accuracy is warranted for a period of 1 year. After 1 year, the meter should be returned to Newport Corporation for re-calibra- tion and NIST traceability recertification. Newport detectors also require recertification at one year intervals.

  • Page 60: Section 8 - Factory Service

    Introduction This section contains information regarding obtaining factory service for the 1830-C Optical Power Meter. The user should not attempt any mainte- nance or service of this instrument and/or accessories beyond the proce- dures given in Section 7: Troubleshooting and Maintenance. Any problems which cannot be resolved using the guidelines listed in Section 7 should be referred to Newport Corporation factory service personnel.
  • Page 61 Service Form Newport Corporation U.S.A. Office: 714/863-3144 FAX: 714/253-1800 Name RETURN AUTHORIZATION # _____________________________________________________________________________________ _____________________________ Company (Please obtain prior to return of item) _______________________________________________________________________________ Address Date _________________________________________________________________________________ _________________________________________________________________ Phone Number _________________________________________________________________________________ _________________________________________________ Country _________________________________________________________________________________ P.O. Number ___________________________________________________________________________ Item(s) Being Returned:...

  • Page 63: Status Reporting System

    <SRQ> Figure 10. The 1830-C’s Status Reporting System for the GPIB Bus. The Status Byte Register is used to record a summary of the 1830-C’s current condition for the Status Reporting System. The status of the 1830-C is returned to the controller when a serial poll is performed. The register is bit mapped, meaning that each condition is represented by a bit of different binary weight (...,8,4,2,1).
  • Page 64 Request Enable Register, an <SRQ> will be generated once for the given event. When the <SRQ> is asserted and a serial poll of the 1830-C is per- formed, bit 6 and the bit(s) that initiated the <SRQ> will be set high in the byte returned by the serial poll.
  • Page 65 When the SERVICE REQUEST bit changes state from low to high, the 1830-C automatically asserts a service request <SRQ>. READ DONE: This bit goes high when a new reading has been taken by 1830-C that is not an over-range, or did not saturate the photodetector, and was not taken while ranging.

  • Page 66: Sample Programs

    50 ‘This program is designed to show you how to write a simple 60 ‘program that will write commands and read query responses to and 70 ‘from the 1830-C via the RS-232 port on the 1830-C Rear panel and the 80 ‘RS-232 port on an IBM PC/AT or compatible.
  • Page 67 RETURN 4030 ‘ 5000 ‘ Read.RS232.String : Read a string from the 1830-C RS-232 port 5010 ‘ Characters are read one at a time until a <LF> character is 5020 ‘ read or 2 seconds elapse between consecutive character reads.
  • Page 68 6030 GOSUB 5000 6040 IF RS232IN$ = “0” + CHR$(13) + CHR$ (10) THEN GOTO 6120 6050 PRINT “Disabling echo mode ..”; 6060 RS232OUT$ = “E0” 6070 GOSUB 4000 6080 GOSUB 5000 ‘Read”>1" 6090 GOSUB 5000 ‘Read “>E0” 6100 GOSUB 5000 ‘Read “>” ( timeout because no <NL> ) 6110 PRINT “ECHO mode disabled “...

  • Page 69: Example Program For Ieee 488 Communication

    Rename one of the devices “DEV4” when running the IBCONF program ‘ included with the board. Remember the device number you renamed ‘ and set the DIP switches on the back of the 1830-C to reflect the ‘ address you have selected. ‘ ‘Written By: Rakesh Pandit ‘...
  • Page 70 LOCATE 1, 22: PRINT “N E W P O R T C O R P O R A T I O N” LOCATE 2, 19: PRINT “1830-C to IEEE-488 Communication Program” PRINT : PRINT RETURN ‘Enter.User.Commands: Get and interpret the user’s commands.
  • Page 71 PRINT “IEEE-488 port timed out when trying to read input.” RETURN END IF CALL IBRD(device.number%, IEEEin$) ‘Read IEEE-488 port IEEEin$ = RTRIM$(IEEEin$) ‘Trim trailing spaces IF (LEN(IEEEin$) > 0) THEN ‘If something was read from port PRINT IEEEin$; ‘print the input string ELSE PRINT “Error occurred when reading IEEE-488 port.”...

  • Page 72: Simplified 1830-C Functional Block Diagram

    Appendix C Simplified 1830-C Functional Block Diagram A simplified block diagram of the 1830-C is shown in Figure 11. The heart of the 1830-C is a current to voltage converter followed by an A/D converter that translates the conditioned analog input signals into a form usable by the microcomputer.
  • Page 74 1791 Deere Avenue Irvine, CA 92606 (In U.S.): 800-222-6440 Tel: 949-863-3144 Fax: 949-253-1680 Internet: sales@newport.com Visit Newport Online at: www.newport.com P/N 20372-01, Rev. H Newport Corporation, Irvine, California, has IN-07941 (07-00) been certified compliant with ISO 9001 by the British Standards Institution.

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