Burleigh Wavemeter WA-1150 User manual

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Operating Manual
WA-1150 and WA-1650 Wavemeter


optical wavelength meter
09042-M-00 (Rev. C)
© 2002 EXFO Burleigh Products Group Inc.
All Rights Reserved.
Wavemeter is a registered trademark of Burleigh Instruments, Inc., an EXFO company.
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Table of Contents
1. Introduction.......................................................................................................................................1-1
Overview.............................................................................................................................................1-1
Safety Considerations.........................................................................................................................1-2
Unpacking & Inspection......................................................................................................................1-2
Setup ..................................................................................................................................................1-3
Fiber End Cleaning .............................................................................................................................1-3
Cleaning a Fiber-Optic Connector .........................................................................................1-4
Cleaning a Universal Connector ............................................................................................1-4
Routine Maintenance..........................................................................................................................1-5
2. Front Panel Controls and Screens..................................................................................................2-1
Front Panel Controls...........................................................................................................................2-1
Using the Front Panel Controls ..........................................................................................................2-2
Change Screens....................................................................................................................2-2
Change Parameter Values ....................................................................................................2-2
Save Parameter Values.........................................................................................................2-3
Restore Saved Parameter Values .........................................................................................2-3
Display Screens.....................................................................................................................2-3
Setup Screens ....................................................................................................................................2-5
3. Remote Communications ................................................................................................................3-1
Overview.............................................................................................................................................3-1
SCPI Communications Scheme .........................................................................................................3-1
SCPI Command Detail .......................................................................................................................3-5
Common Commands ............................................................................................................3-5
Measurement Instructions .....................................................................................................3-8
CALCulate Subsystem ........................................................................................................3-10
DISPlay Subsystem .............................................................................................................3-13
SENSe Subsystem ..............................................................................................................3-15
STATus Subsystem.............................................................................................................3-17
SYSTem Subsystem ...........................................................................................................3-19
TRIGger Subsystem ............................................................................................................3-21
UNIT Subsystem .................................................................................................................3-21
4. Theory of Operation & Calibration..................................................................................................4-1
Operating Principles ...........................................................................................................................4-1
Wavelength Accuracy.........................................................................................................................4-1
Power Accuracy..................................................................................................................................4-2
Calibration...........................................................................................................................................4-2
Appendix A. Specifications & Labeling..............................................................................................A-1
Dimensional Drawing......................................................................................................................... A-2
Rack Mounting Option ....................................................................................................................... A-3
Appendix B. Warranty & Service.........................................................................................................B-1
Warranty............................................................................................................................................ B-1
Service............................................................................................................................................... B-1
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Appendix C. Error & Status Messages............................................................................................... C-1
Error Messages................................................................................................................................. C-1
Status Messages............................................................................................................................... C-2
Appendix D. Rear Panel Controls....................................................................................................... D-1
Rear Panel ........................................................................................................................................ D-1
GPIB Interface................................................................................................................................... D-1
GPIB System Controller Settings ......................................................................................... D-2
RS-232 Interface ............................................................................................................................... D-3
Signal Monitor Connector.................................................................................................................. D-4
Changing Fuses ................................................................................................................................ D-6
Index
Declaration of Conformity
Assumptions
This operating manual provides information for individuals who use the EXFO WA-
1150 and WA-1650 Wavemeter optical wavelength meters.
Unless specifically stated, the information in this manual applies to both the WA-1150
and WA-1650 models.
This manual assumes familiarity with communication software and hardware interfaces
with an IBM, or compatible, personal computer.
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WA-1150 and WA-1650 Wavemeter Operating Manual 1 Introduction
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 1-1
1. Introduction
This section provides general information on the WA-1150 and WA-1650 and
information on unpacking and setting them up.
Overview
EXFO’s WA-1150 and WA-1650 Wavemeteroptical wavelength meters are
instruments designed for simple, automatic and accurate wavelength measurement of
continuous wave (CW) and modulated laser sources. They analyze interference fringes
produced by the input laser radiation in a scanning Michelson interferometer with a
built-in reference laser.
Both the WA-1150 and WA-1650 have microprocessor-based electronics that allow
accurate counting and analysis of interference fringes. The microprocessor computation
automatically corrects for the refractive index of air, using data from built-in temperature
and pressure sensors and converts the resulting measurement to units of nm or GHz. The
microprocessor also makes it possible for the WA-1150 and WA-1650 to calculate and
display the deviation between the measured wavelength and starting point, or compute
the average of up to 128 measurements. Refer to Section 4, Theory of Operation &
Calibration, for additional information on the theory of operation.
Introduce laser light into the WA-1150 or WA-1650 by attaching your fiber-optic cable
to the fiber-optic connector on the front of the unit. The standard connector is the EXFO
universal FC/UPC connector. FC/APC, SC/UPC, SC/APC and ST/UPC connectors are
available as an option at the time of order.
The instrument’s front panel has controls to review data and review and change
parameter values. Refer to Section 2, Front Panel Controls and Screens, for
information on the controls and display and setup screens.
The WA-1150/WA-1650 have a built-in bi-directional RS-232 interface and a GPIB
interface for transmitting data and remotely controlling the instrument. Refer to Section
3, Remote Communications, for information on these interfaces and the SCPI
communication scheme.
The Monitor port on the back of the system provides access to the interferometer fringe
signals and timing signals that govern the wavelength measurement. Refer to Appendix
D, Rear Panel Controls, for further information.
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WA-1150 and WA-1650 Wavemeter Operating Manual 1 Introduction
1-2 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
Safety Considerations
This product has been designed, manufactured and tested in accordance with EC
Standard EN61010-1, Safety Requirements for Electronic Measuring Apparatus and has
been supplied in a safe condition. Make sure that you follow the recommendations in
this section to ensure safe operation of your instrument and to maintain the product in a
safe condition.
Laser Classification: This product is classified FDA Laser Class I (IEC Laser Class 1)
laser.
WARNING THIS EQUIPMENT MUST BE USED AS SPECIFIED OR THE
PROTECTION PROVIDED BY THE EQUIPMENT MAY BE
COMPROMISED. YOU MUST USE THIS PRODUCT IN A
NORMAL MODE AND SHOULD NOT DEVIATE FROM THE
WRITTEN INSTRUCTIONS PROVIDED.
WARNING THERE ARE NO OPERATOR-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL. TO PREVENT
ELECTRICAL SHOCK, DO NOT OPEN OR REMOVE COVERS.
WARNING TO PREVENT ELECTRICAL SHOCK, TURN OFF THE POWER TO
THE SYSTEM BEFORE CLEANING. USE A DRY OR SLIGHTLY
DAMPENED (WITH WATER) CLOTH TO CLEAN THE EXTERNAL
PARTS. DO NOT ATTEMPT TO CLEAN ANYTHING INSIDE THE
INSTRUMENT.
WARNING THIS IS A SAFETY CLASS 1 PRODUCT. PLUG THE MAIN
POWER CORD INTO A SOCKET OUTLET PROVIDED WITH A
PROTECTIVE EARTH CONTACT. ALWAYS USE A THREE-
PRONG AC POWER CORD WITH THIS EQUIPMENT. FAILURE
TO ENSURE ADEQUATE GROUNDING MAY CAUSE
INSTRUMENT DAMAGE.
Unpacking & Inspection
The WA-1150 and WA-1650 are packed in a carton designed to give maximum
protection during shipment. If the outside of the shipping carton is damaged, notify your
shipping department immediately. Your shipping department may want to notify the
carrier.
If the external shipping carton is not damaged, carefully remove and identify all of the
components listed below. Contact EXFO or your local representative if any of the
components are missing. We recommend you save the shipping carton for future storage
or transportation.
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WA-1150 and WA-1650 Wavemeter Operating Manual 1 Introduction
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 1-3
The WA-1150/WA-1650 include the following components:
§Wavemeter unit
§Power cord
§Operating manual
§Optional rack mounts
Setup
Setting up the WA-1150/WA-1650 is a very simple operation as described in the
procedure below.
For benchtop operation, place the instrument on a firm horizontal surface.
Attach the AC line cord. The WA-1150/WA-1650 uses a universal power supply that
works with any line voltage 90-260 VAC, 50/60 Hz.
Turn on the power switch. The system’s self-test takes approximately 30 seconds. For
WA-1650 models, the display indicates Laser Warm-up and the elapsed time since the
unit was turned on. This message is displayed until the reference laser inside the WA-
1650 is stabilized. Typical laser warm-up time is approximately 6 minutes (WA-1650
only).
Ensure all fiber-optic connectors are clean and dry (see below). Then connect your fiber-
optic cable to the fiber-optic connector on the instrument front panel. Make sure the
fiber end does not rub against any surface and do not overtighten.
CAUTION The WA-1150/WA-1650 are designed to operate within the specified environmental
specifications. This requires proper ventilation. Do not block the rear fan. Do not
place the back of the instrument in an enclosed area that limits free airflow.
CAUTION Use care in handling fiber-optic connectors. Always clean the fiber end prior to
insertion into the connector for optimum performance and to avoid power
measurement errors.
Fiber End Cleaning
To make good optical measurements, it is extremely important to clean the fiber-optic
connector before each connection. Dirt on the connector can degrade the reliability of
the measurement and cause permanent damage to the connector resulting in an expensive
repair.
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WA-1150 and WA-1650 Wavemeter Operating Manual 1 Introduction
1-4 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
Modern fiber-optic connectors rely on a glass-to-glass contact to reduce Fresnel
reflections at the connector interface. A dirty or damaged connector on the cable can
damage the input connector on the instrument front panel. Always use a good quality
cable connector. If there is any question of the surface quality on the tip of the cable
connector, inspect it under a microscope for scratches or debris.
Some general recommendations:
§Never use a metal or other hard object for cleaning that would scrape the connector.
§Do not apply index-matching gel or oils.
§Always keep connectors covered for protection when not in use.
Cleaning a Fiber-Optic Connector
To clean the end of the connector on the fiber-optic cable,
1. Gently wipe the tip with a lint-free swab or lens paper dipped in isopropyl alcohol.
2. Dry it by wiping gently with a clean dry lint-free lens paper.
3. As soon as the connector is dry, insert it in the instrument panel or cover it for later
use.
Cleaning a Universal Connector
NOTE Refer to Figure 1-1 below.
To clean the end of the universal connector,
1. Unscrew the fiber from the instrument and put a protective cap on it.
2. Close the universal protective fiber cap.
3. Gently push in the universal connector and rotate it counter-clockwise ¼ turn.
4. Pull out the fiber-optic adapter.
5. Gently wipe the tip with a lint-free swab or lens paper dipped in isopropyl alcohol.
6. Dry it by wiping gently with a clean dry lint-free lens paper.
7. As soon as the connector is dry, insert it in the instrument front panel or cover it for
later use.
NOTE The fiber-optic adapter is keyed. Insert the adapter in the same position that you
removed it.
8. Rotate the universal connector ¼ turn to lock it in.
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WA-1150 and WA-1650 Wavemeter Operating Manual 1 Introduction
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 1-5
Figure 1-1. Universal connector removal sequence
Routine Maintenance
The fan on the rear panel of the WA-1150/1650 provides important ventilation to
components inside the chassis. A filter covers the fan opening to keep out dust. This
filter should be cleaned periodically, especially in a high dust environment or if it
becomes noticeably dirty. You must keep the filter clean in order to ensure proper
operation of the instrument.
To clean the dust filter,
1. Pry off the plastic grill covering the filter with a small screwdriver.
2. Remove the foam filter.
3. Use a small brush, plus soap and water (if necessary), to clean the filter.
4. When the filter is dry, reposition it in the fan housing and snap the grill back in
place.
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WA-1150 and WA-1650 Wavemeter Operating Manual 1 Introduction
1-6 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 2-1
2. Front Panel Controls and Screens
This section provides information on the WA-1150/WA-1650 front panel controls,
describes the display and setup screens and provides instructions on changing screen
displays and parameter values.
Front Panel Controls
The front panel is shown in Figure 2.1. The controls are described in Table 2-1.
The display consists of an 8½ digit numerical readout and buttons for selecting
parameters that affect how the data is collected and how the information is displayed.
There are several different screens, each with different information as shown and
described later in this section.
Figure 2-1. Front Panel
Display Control Buttons
Power LED
Power Switch
Fiber Input
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
2-2 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
Table 2-1 Front Panel Controls
Control Description
Power Switch turns the instrument on and off.
LED Indicator shows the power status. When lit, the unit is turned on; when not lit, the unit
is off.
Display Button cycles through the display screens: Main, Wavelength and Power. Display
screens contain parameters you can review and select as well as calculated or
measured data for review only. Refer to 'Display Information' later in this section for
additional information.
Setup Button cycles through the setup screens: Measurement, Communications, System and
Status. Setup screens contain a list of parameters for review and change. Refer to
'Setup Information' later in this section for additional information.
Select Button "highlights" or selects parameters on the displayed screen.
↑
↑↑
↑and ↓
↓↓
↓Buttons change the value of the selected parameter.
Using the Front Panel Controls
Use the four display area controls to review information and make changes to the
available parameters. The headings below provide information on how to perform
various procedures using these front panel controls.
Change Screens
To change which display screen is shown, press Display. The instrument cycles between
the display screens. To change which setup screen is shown, press Setup. The
instrument cycles between the setup screens.
Change Parameter Values
Each display and setup screen contains parameters whose values you can change.
(Display screens also contain calculated or measured data.) Some parameters are located
below the line on the bottom of the display screens and other parameters are located
above the line, such as the wavelength and power units. Refer to Figures 2-2 through 2-4
for graphic illustrations of the parameters on each display screen.
To change a parameter value or status, press Select to highlight the parameter field, then
press ↑
↑↑
↑or ↓
↓↓
↓. The parameter's value or status changes.
NOTE If the message "Remote Lockout" is displayed on the screen when you attempt to change
a parameter value, remote communications is enabled (on). When enabled, you can use
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 2-3
the front panel controls to review all parameter values, but you cannot change any
parameters except the status of the remote feature to off.
Save Parameter Values
You may want to save parameter values that are appropriate for your application, so that
each time you power up the instrument, this information is selected automatically. Or, if
you have several instruments, you may want to set them all up the same way.
To save parameter values, display the Configuration screen, press Select to highlight the
Save All field, then press either press ↑
↑↑
↑or ↓
↓↓
↓. The current parameter values are saved.
Restore Saved Parameter Values
You may want to restore saved parameter values, for example, if you change the value
for a parameter or several parameters to observe their effect, but then decide you want to
use the initial values.
To restore saved values, display the Setup Measurements screen, press Select to
highlight the Restore All field. The saved values are restored.
Display Screens
The display screens provide measurement information as summarized below. Figures 2-
2 through 2-4 show each display screen and Table 2-2 describes each item on these
screens. You access the three display screens by pressing Display on the instrument
front panel and toggling the key to move through the choices.
Main. Initially displays a start-up screen for approximately 30 seconds after you first
power on the unit. After a self-test and reference laser warm-up (WA-1650 only), the
screen is replaced with summary information on the current wavelength and power and
pertinent parameter values. For the WA-1650 only, if the warm-up time is greater than
59 minutes, an exception occurs, which causes the wavelength to not be displayed, yet all
system functions are active. Warm-up time at room temperature (20°C) typically is less
than seven minutes.
Wavelength. Displays wavelength information and two methods of calculating delta (∆)
for a comparative analysis. This screen shows the following numeric values: Current
wavelength, Start, ∆(Current – Start), Maximum, Minimum, ∆(Maximum – Minimum)
as well as the elapsed time and pertinent parameter values.
Power. Displays power information and two methods of calculating delta (∆) for a
comparative analysis. This screen shows the following numeric values: Current power,
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
2-4 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
Start, ∆(Current – Start), Maximum, Minimum, ∆(Maximum – Minimum) as well as the
elapsed time and pertinent parameter values.
Figure 2-2. Main Screen
1552.5218 nm -21.54 dBm
Wavelength Range
Vacuum Avg: 8 Poffs: Off 00:03:12
Figure 2-3. Wavelength Screen
1552.5218 nm Start:1552.5212 ∆: 0.0006
Max: 1552.5200 Min: 1552.5235 ∆: 0.0035
Wavelength Range
Vacuum Avg: 8 Reset 00:03:12
Figure 2-4. Power Screen
-11.54 dBm Start:-11.52 ∆: -0.02
Max: -11.60 Min: -11.50 ∆: -0.10
Wavelength Range
Poffs, Off Avg: 8 Reset 00:03:12
Wavelength Power
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 2-5
Table 2-2. Display Screen Information
Parameter Description
Avg Displays the number of previous measurements used to calculate the running
average. Calculation of the average wavelength and power uses the same average
value. On the Main and Wavelength screens, you can toggle the average between
Off and the numeric value set using the Measurement setup screen.
Off indicates averaging is not used.
Numeric value (2, 4, 8, 16, 32, 64, or 128). Change the numeric value on the
Measurement setup screen.
Vacuum/Std. Air Identifies the medium in which the measurement occurs as standard air (15°C, 760
mm Hg and 0% relative humidity) or vacuum. You can change the medium to
vacuum on the Main and Wavelength screens.
Poffs Displays the power offset value applied to subsequent power measurements. These
values enable you to obtain accurate power readings when you place an attenuator
external to the instrument. If you enter a power offset value equal to the external
attenuator, the instrument automatically displays the correct power. This is useful if
the signal input power exceeds the maximum allowed input of 10 mW (10 dBm).
Off indicates a power offset is not used.
Numeric value (1, 2, …, 20 in dB units). You cannot change the type of units.
Change the numeric value on the Measurement setup screen.
Power Units The current laser power displayed in the selected units. You can change the type of
units on the Main or Power display screen. The options are dBm and mW or (µW).
If mW or µW are selected, the Power Autorange feature automatically sets units to
mW or µW depending on input power.
Reset Restarts calculations of Current - Start and Max - Min. When actuated, it zeros
elapsed time, then displays the start and current values.
Error Message Indicates an error message, if any. See Appendix C for messages and corrective
action.
Wavelength Units The current wavelength displayed in the selected units. You can change the units on
the Main or Wavelength display screen. The units are nm and GHz.
If an error has occurred, this area displays a status message.
See Appendix C for messages and corrective action.
Presence indicates that an exception has occurred. Check the status screen or read
the status byte. See Appendix C for messages and corrective action.
Setup Screens
The setup screens provide information that affects the display of measured values and
calculation of values. Each screen is summarized below and described in more detail in
the tables that follow. Access the setup screens by pressing Setup on the instrument
front panel and toggling the key to move through the choices.
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
2-6 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
§Configuration. Contains parameters that affect how the instrument makes specific
calculations and how it determines the information on the instrument display, for
example, save and recall the parameter selections, change the brightness of the
instrument display and reset the null value for power measurement. See Table 2-3
for details.
§Communications. Use to change remote communication parameters. See Table 2-4
for details.
§Information. Displays the instrument serial number and software version
information, reference laser information, pressure and internal temperature for
review. The WA-1650 reference laser information includes the peak power, percent
of peak power and the minutes to warm up, and the WA-1150 displays just the peak
power. See Table 2-5 for details.
§Status.Displays the status codes that indicate the latest exceptions that have
occurred. See Appendix C for messages and corrective action.
Table 2-3. Configuration
Parameter Description/Options
Resolution Identifies the wavelength resolution value.
.0001, .001, .01, 0.1, 1.0, 10.0. Selectable wavelength resolution values. Displayed
values are rounded off to the selected number of decimal places. The .0001 resolution is
not available for the WA-1150.
Average Identifies the number of previous wavelength and power values to use to calculate the
running average. The display is updated with each new measurement.
Off indicates values are not averaged.
2, 4, 8, …, 128 (powers of 2). Selections for average values.
Power Offset Displays the power offset (Poffs) value applied to subsequent power measurements.
These values enable you to obtain accurate power readings when you place an attenuator
external to the instrument. If you enter a power offset value equal to the amount of
external attenuation, the instrument automatically displays the correct power. This is
useful if the signal input power exceeds the maximum allowed input of 10 mW (10 dBm).
Change the offset value on the Main and Measurement setup screens.
Off indicates a power offset is not used.
1, 2, …20 in dBm units. You cannot change the units for the offset.
Power Null Resets the null value used in the power calculation. Use only when no light is entering
the instrument and the fiber connector cap is on.
Frequency
Range
Allows the user to select range of operation. For the WA-1150, either 700 to 1266 nm or
1266 to 1650 nm. The WA-1650 has four operational wavelength ranges: 700 to 1266
nm, 1266 to 1650 nm, 1266 to 1475 nm and 1450 to 1650 nm. Operating the WA-1650 in
the 1266 to 1650 nm range reduces the measurement update time to 2 seconds. All other
ranges operate at a 1-second measurement update rate.
Brightness Changes the brightness of the display.
High: Maximum intensity.
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 2-7
Low: 62.5% of the maximum intensity.
Save All Allows you to save the current parameter values.
Restore All Allows you to restore the saved parameter values.
Table 2-4. Communication
Parameter Description/Options
Remote
(Lockout)
When enabled (on) you can use the front panel controls to review parameter values, but
can only change (disable) the "Remote" parameter. Attempting to change other
parameters when this feature is enabled will display the message "Remote Lockout".
Off permits changing all front panel controls.
RS-232 Enables (on) and disables (off) communications via the RS-232 port.
Baud Identifies the baud rate for the RS-232 communications. The selections are: 1200, 2400,
4800, 9600 and 19200 baud.
Handshaking Identifies the type of handshaking used for the RS-232 communications. The selections
are Hardware, Xon/Xoff (software) or None.
GPIB Enables (on) and disables (off) communications via the GPIB port.
Address Identifies the address used for GPIB output. The selections are 0, 1, 2, …, 31.
Table 2-5. Information
Parameter Description/Options
Serial # The identification number of the instrument.
Internal Temp. Environmental parameter for the interferometer.
Ref Laser
Power
Information on the status of the reference laser.
% of Peak
Power
Information on the status of the reference laser.
Version The current software revision.
Pressure Environmental parameter for the interferometer.
Warm-Up
Time
Information on the status of the reference laser.
The Status screen provides internal status messages for service use only.
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WA-1150 and WA-1650 Wavemeter Operating Manual 2 Front Panel Controls and Screens
2-8 (09042-M-00 Rev C) EXFO Burleigh Products Group Inc.
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WA-1150 and WA-1650 Wavemeter Operating Manual 3 Remote Communications
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C) 3-1
3. Remote Communications
This section discusses the use of remote communications to review and control the
instrument.
Overview
You can control the instrument remotely using either an RS-232 or a GPIB interface
using the SCPI communications scheme. Connections for both interfaces are provided
on the back of the instrument as shown later in this section.
You must use the instrument front panel controls to enable remote communications for
the specific type of interface. Refer to Table 2-4 in Section 2 of this manual for
information.
SCPI Communications Scheme
This topic provides information on the communication scheme that follows the Standard
Commands for Programmable Instruments (SCPI) Syntax and Style Guidelines.
Table 3-3 provides a summary of commands by subsystem and the information after the
table describes each command in detail.
Note: […] indicates an optional argument. {…|…|…} indicates a choice from a set of
arguments.
Table 3-3. SCPI Command Summary
Group & Command Description
Common Commands Defined by IEEE 488.2, these control some functions that
are common to all IEEE 488.2 instruments.
*CLS Clears all event registers and the error queue.
*ESE? Queries the bits in the standard event status enable register.
*ESE <integer> Sets the bits in the standard event status enable register.
*ESR? Queries value standard event status register.
*IDN? Queries instrument model number, serial number and
firmware version.
*OPC? Queries the operation complete bit of the standard-event
status register.
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