Related Manuals for Molectron EPM2000
Summary of Contents for Molectron EPM2000
- Page 1 (217) 352-9330 | Click HERE Find the Coherent / Molectron EPM-2000 at our website:...
- Page 2 EPM2000/EPM2000e Dual-Channel Joulemeter/Power Meter...
- Page 4 EPM2000/EPM2000e Dual-Channel Joulemeter/Power Meter Reference Guide...
- Page 5 Phone: 800.366.4340 or 503.620.9069 Fax: 503.620.8964 www.molectron.com 2001 by Molectron Detector, Inc. All rights reserved. © No portion of this publication may be reproduced or transmitted in whole or in part in any form or by any means without permission of the publisher.
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Page 6: Table Of Contents
Interface ..........................3 Units and Ranges ........................3 Compatible Probes ......................... 4 Understanding the EPM2000 Internal Trigger ................4 Understanding the EPM2000 External Trigger Circuit .............. 6 Understanding the EPM2000 Speedup Feature ............... 7 Description ..........................8 Rear Panel ..........................8 Front Panel .......................... - Page 7 RS-232 Baud Rate ......................... 25 RS-232 Enable/Disable ......................25 RS-232 Parity ........................25 RS-232 Stop Bits ........................26 Setup Store & Recall ......................26 Statistics Batch Restart Mode ....................26 Statistics Batch Size ........................ 27 Trigger Holdoff ........................27 Trigger Level .......................... 28 Trigger Source ........................
- Page 8 Statistics Send ........................44 Statistics Start ......................... 44 Timestamp ..........................45 Trigger Holdoff ........................45 Trigger Level .......................... 46 Trigger Source ........................46 Units ............................46 Wavelength Compensation ...................... 47 Zero ............................47 Missing Data ..........................48 FIFO Full Condition ....................... 48 Communications Buffer Overrun .....................
- Page 9 Factory Defaults ........................62 Warranted Characteristics ......................62 Power ............................ 62 Atmospherics (Temperature) ....................62 Atmospherics (Relative Humidity) ................... 62 Atmospherics (Altitude) ......................63 Dynamics (Random Vibration) ....................63 Emissions ..........................63 Susceptibility .......................... 63 Appendix - Declaration of Conformity ..............65 Index...........................
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Page 10: Features & Description
Thank you for purchasing an EPM2000/EPM2000e (referred to as “EPM2000” in this reference guide). The EPM2000 is a dual-channel AC powered, laboratory meter that can measure both pulsed and CW lasers: energy, power, voltage, and (pulsed only) frequency. The EPM2000 is compatible with all of Molectron Detector, Inc.’s pyroelectric, silicon, and PowerMax... -
Page 11: Safety Information
NFORMATION Review this safety information carefully to avoid injury and prevent damage to this instrument or any instrument connected to it. There are no user serviceable parts in the EPM2000. For Service, please see Maintenance, Service, & Calibration. This reference guide uses two terms to describe hazardous conditions: Caution and Warning. -
Page 12: Manual Information
Features & Description ANUAL NFORMATION This reference guide may be read sequentially, but should be stored near the EPM2000 and used as a reference. There are five basic components of this reference guide: • Features & Description An introduction to the EPM2000 and its features and controls •... -
Page 13: Compatible Probes
2% below the peak height. For example, with a peak height of 300 mJ, set the EPM2000 to a range of 3 J. A peak will occur at 10% of full scale, well above the 5% level. The trigger level should not be set higher than 8%. If the noise level is 5% of full scale (approximately 150 mJ) then the trigger level should be set no lower than 7%. - Page 14 The EPM2000 can be programmed to ignore triggers for a specified time after a valid trigger. This prevents “false” triggers in pulse tails from accidentally starting a new sample (see Figure 2). This amount of delay time is called the Trigger Holdoff (see Operation -- Settings -- Trigger Holdoff).
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Page 15: Understanding The Epm2000 External Trigger Circuit
This allows the EPM2000 to read very long pulses with well-behaved rise characteristics. Figure 4: Determining a peak. Trigger the EPM2000 as close to the pulse as possible. If the EPM2000 is triggered too early, it will detect fluctuations in the noise preceding the pulse and derive a false peak. -
Page 16: Understanding The Epm2000 Speedup Feature
PM5K, which can measure power as high as 7500 Watts, have a long response time. The EPM2000 solves this problem by using probe information and an internal algorithm, called the Speedup feature, to quickly estimate the final power value. -
Page 17: Description
Features & Description 15 W Measured Speedup Reading Power Probe Output 10 W 10 s Figure 6: The Speedup feature estimating a 15 Watt power reading. ESCRIPTION ANEL Figure 7: EPM2000 Rear Panel. EPM2000/EPM2000e Reference Guide... - Page 18 These inputs accept synchronized pulses from the laser. They are electrically isolated from the EPM2000 and consist of a 100 Ω resistor in series with an optoisolator. They can be set from the front panel or via remote to trigger on the rising or falling edge of the input signal. They only trigger pyroelectric/silicon measurements.
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Page 19: Front Panel
Features & Description AC In Connector Connect only to the factory supplied, polarized AC cord. The EPM2000 will function at AC voltages from 90 to 264 VAC at frequencies between 50 Hz and 60 Hz. Fuseholder Replace this fuse with only a 240 VAC 1 Amp fast-blow fuse. A convenient replacement fuse is stored in the holder. - Page 20 Features & Description Ratio Keys Use these keys to set the EPM2000 into Ratio Mode. One of the two channels must have a trigger source set to SLAVE. This key displays the ratio of A/B on the channel A. This key displays the ratio of B/A on channel B.
- Page 21 Features & Description Function Keys Nine different keys control the primary functions of the EPM2000. Sets the channel to report incoming energy in Joules during pyroelectric/silicon measurements. Sets the channel to report probe output in Volts -- pulse height for pyroelectric/silicon measurements, DC voltage during thermopile measurement.
- Page 22 Features & Description Figure 10: EPM2000 LCD Digital Display. Digital Display Twelve different readouts appear on the EPM2000's liquid crystal display (see Figure 10). REM Annunciator Indicates the instrument is under remote control. Numeric Display Typically indicates measurement value. Alphanumeric Display Typically indicates measurement unit, and some auxiliary functions.
- Page 23 Features & Description EPM2000/EPM2000e Reference Guide...
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Page 24: Operation
UTORIAL HERMOPILE Measuring laser power using a PowerMax thermopile probe is easy with the EPM2000. It automatically searches for an attached thermopile probe when powered up. An attached thermopile probe is queried and the probe's responsivity is automatically programmed into the EPM2000. - Page 25 6. Block the beam and wait for the EPM2000 display to settle. Press to zero the display. 7. Unblock the beam and wait for the EPM2000 to settle on the new, more accurate reading. If the probe responds too slowly to power changes, activate Display Speedup and the EPM2000 will display an estimate of the final value within a few seconds.
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Page 26: Pyroelectric
Pulse In connector, but in such cases as the J9-0660 pyroelectric probe, this will be a 25-pin Smart Probe connector. 3. Turn the EPM2000 on if it’s not already on. If the instrument isn't in Normal Mode, place it into Normal Mode by pressing 4. -
Page 27: Modes
Joules, Volts, or Watts, and the measurement unit can be changed while in Auto Mode, but the trigger source must always be external. The EPM2000 will not autorange from an internal trigger. While in Normal Mode, measuring Joules, Volts, or Watts, press to set the channel in Auto Mode. -
Page 28: Average Mode
Use Statistics Mode to measure statistical qualities of a predetermined number of samples. This number, the Statistics Batch Size, can be 0 or any number from 2 to 9999. The EPM2000 can be programmed to stop after taking a single batch (Manual Restart Mode), or continue sampling a new statistical batch (Automatic Restart Mode). -
Page 29: Ratio Mode
B/A on Channel B’s display. Channel A will display its current reading. If programmed to store readings in the data buffer, the EPM2000 will store the quotient in the buffer - - not the raw readings. -
Page 30: Average Batch Size
Operation VERAGE ATCH The number of samples in each of the EPM2000 channel's Average Batch Size can be any value from 2 to 99. Note that each channel uses its own button. To change the quantity, press . The LCD will indicate the current value. For example, a value of 57 samples looks like . -
Page 31: Ieee-488 Address
IEEE-488 A DDRESS Set the EPM2000 IEEE-488 address to any value from 1 to 31. Although the EPM2000 can use address 0, this is not recommended, as the IEEE-488 bus expects the instrument at address 0 to be a Controller. -
Page 32: Long Risetime Mode
Press to display the current risetime value. This value represents the maximum risetime that can be accurately measured (10 ms maximum). The EPM2000 is set at the factory to measure a 2 ms maximum risetime. Pressing cycles this value through 2 ms, 4 ms, 8 ms, or 16 ms. -
Page 33: Responsivity (Pyroelectric)
As with Pyroelectric Responsivity, each channel’s Thermopile Responsivity can be manually programmed. Because an EPM2000 reads any attached PowerMax probe upon powerup, changing the Thermopile Responsivity is only good until the EPM2000 is turned off or a new probe is attached. To change the thermopile responsivity, press . -
Page 34: Rs-232 Baud Rate
Operation RS-232 B The RS-232 interface requires a baud rate selected for the EPM2000 that matches the baud rate of the host machine. The instrument supports six different baud rates: 1200, 2400, 4800, 9600, 19200, and 38400. To change the RS-232 baud rate, press . -
Page 35: Rs-232 Stop Bits
ATCH ESTART Each channel of the EPM2000 handles the end of a statistical batch in one of two different ways. In Automatic Restart Mode, at the end of a batch, the channel automatically begins collecting the next batch. The calculated statistical values are displayed on screen until the new batch has been collected. -
Page 36: Statistics Batch Size
The Trigger Holdoff determines how long the EPM2000 waits after receiving a valid trigger before resetting the triggering circuit. This avoids false triggers from a noisy pulse tail (See Understanding the EPM2000 Trigger). The Trigger Holdoff can be set for 0 to 49 ms and the holdoff of each channel can be set independently. -
Page 37: Trigger Level
RIGGER EVEL The EPM2000 internal trigger level can be set for as low as 2% of full scale and as high as 20% of full scale. Noisy environments require higher trigger levels. As with Trigger Holdoff, the trigger level of each channel can be set independently. -
Page 38: Wavelength Compensation
Sometimes a probe calibrated for one laser wavelength must be used to measure laser energy of another wavelength. Because of differing absorptive characteristics, the results are often incorrect. Program the wavelength correction of each channel of the EPM2000 independently, using that channel’s key. - Page 39 Operation EPM2000/EPM2000e Reference Guide...
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Page 40: Programming
Commands will function as described with either the RS-232 or IEEE-488 interface. If the EPM2000 receives a command it does not know or cannot process, no action will occur, unless IEEE-488 Communication Error reporting is activated, in which case, the instrument will reply with the error message: Unrecognized SCPI command: <... -
Page 41: Audible Beeper
? SYSTEM: OPTION: AUDIO OFF VERAGE ATCH Set or query the Average Mode Batch Size of each channel of the EPM2000. Command Form CHannel <A|B|ALL> AVERage BATch_size <?|2..99> Examples Input Instrument Reply... -
Page 42: Buffer Contents
Programming UFFER ONTENTS Queries the number of bytes residing in the EPM2000’s data buffer. This command does not affect the data, nor prevent additional data from being added to the buffer. Command Form OUTput BUFFER CONTENTS Example Input Instrument Reply... -
Page 43: Identification
EPM2000 Ver G4.30 13-Aug-98† † Actual reading will vary, depending on installed firmware. IEEE-488 A DDRESS Set or query the IEEE-488 address of the EPM2000. The instrument must be reset for this command to take effect. Command Form COMMunication GPIB ADDRess <?|0..31) -
Page 44: Line Frequency
Set or query the scale factor for the Trigger Holdoff, which allows more accurate measurement of slower (> 2ms risetime) pulses. The argument corresponds to the maximum risetime (ms) which the EPM2000 can accurately measure. 2 ms is a scale factor of 1, 4 ms is a scale factor of 2, etc. Command Form CH <A|B|ALL>... -
Page 45: Output Buffer
Example Input Instrument Reply out cont on none UTPUT EPTH Set or query the depth of the EPM2000 data buffer in bytes, any value from 1 to 4095. Command Form OUTput DEPth <?|1..4095> Examples Input Instrument Reply out dep 1000... -
Page 46: Output Dump
Programming UTPUT Query the EPM2000 data buffer contents, but only when out cont is off. Upon receiving an out dump command, the EPM2000 immediately flushes the contents of its buffer out the selected communications port. out form dictates the nature of the data that is transmitted. Pulse information received by the instrument during the execution of an out dump is stored within the data buffer. - Page 47 4-digit decimal value, and add the implied decimal point. Use the most recent Status Byte values to complete the reading. Table 4: Data High Byte Map. Mnemonic Table 5: Data Low Byte Map. EPM2000/EPM2000e Reference Guide...
- Page 48 Programming For example, an EPM2000 dumps its buffer. The following data is transmitted: 38 21 00 A6 C3 . Translated: A6 CA 3C 38 = 0011 1000 Status Byte, CH A, Unit Information, "Command Completed" 21 = 0010 0001 Status Byte, CH A, Unit Information, "Pulse Measurement", "Volts"...
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Page 49: Probe Type
? OUTPUT: FORMAT BINARY ROBE Query the channel to determine the type of probe attached. In the case of a PowerMax probe, the EPM2000 will also return the head code in hexadecimal notation. Command Form CHan <A|B|ALL> TYPE ? Example... -
Page 50: Range, Maximum/Minimum
? CHAN A: RANGE MAX=30J CHAN B: RANGE MAX=10V ch all range min ? CHAN A: RANGE MIN=1mJ CHAN B: RANGE MIN=1mV ESET Immediately reset the EPM2000. Command Form *RST Example Input Instrument Reply *rst < unit resets >... -
Page 51: Rs-232 Baud Rate
? COMM: RS232: PARITY EVEN RS-232 S Set or query the number of stop bits the EPM2000 injects into the communications stream. Command Form COMMunication RS232 STOPbits <?|1|2> Examples Input Instrument Reply... -
Page 52: Self-Test
Programming Instructs the EPM2000 to perform a self-test and return the result. Command Form *TST ? Example Input Instrument Reply *tst ? PASS PEEDUP Set or query the status of the EPM2000 Display Speedup function. Command Form SYSTem OPTion SPEEDup <?|ON|OFF|SELective>... -
Page 53: Statistics Restart Mode
CHAN B: STAT: MODE MANUAL TATISTICS Set or query the values transmitted by EPM2000 channels in Statistics Mode. Although they can be specified in any order, data will be transmitted only in the following order: AVG, DEV, MIN, MAX. Include headers to add an identifying string (such as AVG=) to the front of each piece of data. -
Page 54: Timestamp
Command Form CHan <A|B|ALL> TRIGger HOLDoff <?|0..49> Examples Input Instrument Reply ch a trig hold 5 none ch b trig hold 15 none ch all trig hold ? CHAN A: TRIG: HOLDOFF 5 CHAN B: TRIG: HOLDOFF 15 EPM2000/EPM2000e Reference Guide... -
Page 55: Trigger Level
CHAN A: TRIG: SOURCE EXTNEG CHAN B: TRIG: SOURCE SLAVE NITS Set or query a channel’s measurement units. When setting the EPM2000 into Ratio Mode, the channel argument indicates the numerator of the fraction. Command Form CHan <A|B|ALL> UNITS <?|VOLts|JOUles|WATts|HZ|RATio>... -
Page 56: Wavelength Compensation
CHAN B: WAVELENGTH COMPENSATION: 514 nm In thermopile mode, this command sets the specified channel’s current probe input voltage as a zero baseline value. While taking a statistics measurement, the EPM2000 channel will reset the batch upon receiving this command. Command Form CHan <A|B|ALL>... -
Page 57: Missing Data
Under certain conditions of heavy processing load and with host communications enabled, the EPM2000 may generate measurement data at a rate faster than the communication port allows. If the host output format is ASCII or ASCII+, the word OVERRUN appears in the output data stream. -
Page 58: Programming Example
ROGRAMMING XAMPLE The following list of commands sets the EPM2000 to collect readings from a 1 KHz pulsed laser source. Channel A collects the raw data and Channel B collects 100-pulse statistical batches. The data are stored in the buffer in binary form (the most compact form) and can be retrieved with an command. -
Page 59: Epm2000E-Specific Features And Functions
Pulse In connector while the unit is powered up. Note: For assistance with any of the following operations, contact a Molectron sales engineer at 1.800.366.4340. Press [J] to measure energy in Joules during pyroelectric/silicon measurements. -
Page 60: Exposure Mode-Specific Computer Interface Commands
<enters exposure mode and begins accumulation> Ch a mea exp off <stops accumulation> Ch a mea energy <enters energy mode> Zero Resets the accumulated exposure measurement. Command Form CHannel <A|B|ALL> ZERO Example Input Instrument Reply Ch a zero <resets accumulated exposure> EPM2000/EPM2000e Reference Guide... - Page 61 Command Form Channel <A|B|ALL> QUERY Example Input Instrument Reply Ch a query CHAN A: QUERY 19.51 J exp on Note: Exposure readings cannot be obtained with the use of the OUT DUMP or OUT CONTINUOUS ON commands. EPM2000/EPM2000e Reference Guide...
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Page 62: Maintenance, Service, & Calibration
The EPM2000 does not respond to anything, the screen is dark. Verify the power cord is plugged securely to the back of the EPM2000 and that the AC socket is powered. Check the fuse and replace if necessary. (see Maintenance, Service, & Calibration -- Fuse Replacement) The EPM2000 is on, but no reading occurs at a laser pulse. - Page 63 ? ch units ? The EPM2000 may be in the middle of collecting the first of a series of statistical batches. Until the first batch is completed, a units query returns the above response. Either query units before entering statistics mode or wait until the first batch has been taken.
- Page 64 This is a result of the limited number of bytes available to describe channels. Use ch all to determine if the EPM2000 is in Ratio mode. If it is, then all data in the buffer is ratio units ? data. The channel refers to the numerator of the calculation.
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Page 65: Fuse Replacement
Figure 12: Removing the EPM2000 fuse and the spare fuse compartment. If the EPM2000 blows two or more fuses in a short period of time, turn the unit off, disconnect it from the AC supply, and contact Molectron Detector, Inc. -
Page 66: Instrument Calibration And Service
Molectron has increased its floor space to 20,000 square feet. Our Metrology department has expanded into this space with the addition of several new laser laboratories. We have a new state-of- the-art DUV lab for calibrating exposure/dose detectors, a new high-power Nd:YAG laser for industrial applications, and facilities for ruby and erbium lasers to calibrate medical sensors. - Page 67 6 in (15 cm) taller, wider, and deeper than the EPM2000. The shipping carton must be constructed of cardboard with a minimum 375 lbs (170 kg) test strength. Cushion the instrument in the shipping carton with packing material or urethane foam on all sides between the carton and the instrument.
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Page 68: Specifications
• Volts 200 µV to 1 V (for thermopile probes) ESOLUTION • Energy 1:3000 of full scale • Power 1:3000 of full scale • Frequency 0.1 Hz • Volts 10 µV AXIMUM • 1000 Hz INEARITY • ±1% EPM2000/EPM2000e Reference Guide... -
Page 69: A/D Digital Resolution
• 100 Ω in series with LED • Rising/falling edge trigger via user control. LECTRONIC CCURACY • Analog output ±1% • Digital display ±1% YSTEM CCURACY • Pyroelectric probe ±5% • Thermopile probe ±3% (with wavelength correction) AXIMUM YROELECTRIC ULSE IDTH • 8 ms EPM2000/EPM2000e ReferenceGuide... -
Page 70: Internal Trigger
• 2.90 kg (6.38 lbs) IRMWARE EVISIONS Every EPM2000 contains three programmed chips, one for each analog board and one for the digital board. Knowing the firmware revisions of these chips is useful when calling Molectron Detector, Inc. Press to see the digital firmware revision. -
Page 71: Factory Defaults
90 - 264 VAC, 47 - 63 Hz, 25 VA TMOSPHERICS EMPERATURE Operating 0°C to +50°C (32°F to +122°F) Storage -40°C to +75°C (-40°F to +167°F) Note: Maximum operating temperature is decreased 1°C per 305 m (1000 ft) above 1525 m (5000 ft). EPM2000/EPM2000e ReferenceGuide... -
Page 72: Atmospherics (Altitude)
• IEC 802-2 Electrostatic Discharge, Performance Criteria B • IEC 801-3 Radiated Susceptibility 3 V/meter from 27 MHz to 500 MHz unmodulated. Performance Criteria: Maximum LCD reading deviation ±3% of reading. • IEC 801-4 Electrical Fast Transient/Burst EPM2000/EPM2000e Reference Guide... - Page 73 Specifications EPM2000/EPM2000e ReferenceGuide...
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Page 74: Appendix - Declaration Of Conformity
Appendix - Declaration of Conformity PPENDIX ECLARATION OF ONFORMITY EPM2000/EPM2000e Reference Guide... - Page 75 Appendix - Declaration of Conformity EPM2000/EPM2000e Reference Guide...
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Page 76: Index
Dump 37 Display 59 Format 37 Electronic Accuracy 60 Probe Type 40 External Trigger Input 60 Range Input Impedance 60 Current 40 Internal Trigger 61 Maximum/Minimum 41 Linearity 59 Reset 41 Maximum Pyroelectric Pulse Width 60 Responsivity 41 EPM2000/EPM2000e Reference Guide... - Page 77 Speedup Feature 7 Instrument Setup Store/Recall Command 34 Understanding the EPM2000 External Trigger Internal Trigger 61 Circuit 6 Understanding the EPM2000 Internal Trigger 4 Understanding the EPM2000 Speedup Feature 7 Units and Ranges 3 Line Frequency 22 Command 35 FIFO Full Condition 48...
- Page 78 Ratio Keys 11 Trigger Rear Panel 8 Holdoff 27 Reset Command 41 Command 45 Resolution 59 Instrument Setting 27 Responsivity In Connectors 9 Command 41 Level 28 Instrument Setting Command 46 Pyroelectric 24 Instrument Setting 28 Thermopile 24 EPM2000/EPM2000e Reference Guide...
- Page 79 Index Source 28 Command 46 Instrument Setting 28 Tutorial Pyroelectric 17 Thermopile 15 Units Command 46 Warranted Characteristics 62 Wavelength Compensation 29 Command 47 Instrument Setting 29 Weight 61 Zero Command 47 EPM2000/EPM2000e Reference Guide...
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