Ethernet dynamic signal analyzers for vibration analysis & monitoring (2 pages)
Summary of Contents for IOtech DaqBook/2000 Series
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USER’S MANUAL DaqBook/2000 Series DaqOEM/2000 Series 16-Bit, 200 kHz Multifunction Data Acquisition Systems DaqBook/2001 DaqBook/2005 DaqBook/2020 DaqOEM/2001 DaqOEM/2005 DaqBook/2000 Series & Measurement Computing DaqOEM/2000 Series 10 Commerce Way 1121-0901 rev 3.0 Norton, MA 02766 (508) 946-5100 *372335A-01* Fax: (508) 946-9500 info@mccdaq.com...
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IOtech, Inc. cannot be held liable for any damages resulting from the use or misuse of this product. Copyright, Trademark, and Licensing Notice All IOtech documentation, software, and hardware are copyright with all rights reserved. No part of this product may be copied, reproduced or transmitted by any mechanical, photographic, electronic, or other method without IOtech’s prior written consent.
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The second includes information regarding eZ-FrequencyView and eZ-TimeView. These two applications have more features than does eZ-PostView 1086-0926 and are available for purchase. They can; however, be used freely during a 30-day 1086-0922 trial period. DaqBook/2000 Series and DaqOEM/2000 Series 898695...
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CD. Manual Layout Chapter 1 – Daq Systems Chapter 2 – DaqBook/2000 Series and DaqOEM/2000 Series Device Overviews Chapter 3 – Block Diagrams Chapter 4 – Connectors, Indicators, Cables, & Pinouts Chapter 5 – A Brief Look at Software Chapter 6 –...
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This page is intentionally blank. DaqBook/2000 Series and DaqOEM/2000 Series 898695...
1. Close all running applications on the host PC. 2. Insert the Data Acquisition CD into your CD-ROM drive and wait for the CD to auto-run. An Opening Screen will appear. As an alternative, you can download software from: www.iotech.com/ftp.html 3. Click the <ENTER SETUP> button.
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Prior to making signal connections review the Specifications chapter of your user’s manual to ensure that your intended signal inputs do not exceed the specified limits. The manual is included in PDF format on your CD. *324631A-01* 324631A-01 IOtech, 25971 Cannon Road, Cleveland, OH 44146-1833 Ph: (440) 439-4091 Fax: (440) 439-4093 productsupport@iotech.com Internet: www.iotech.com...
Using DBK Cards and Modules for Signal Conditioning …… 1-4 Daq Software …… 1-5 This chapter provides a brief overview of Daq devices. Users interested in jumping straight to specific DaqBook/2000 Series or DaqOEM/2000 Series information can skip directly to chapter 2. Daq Systems, the Modular Concept Daq equipment and software form a modular, interrelated family of products that provide great flexibility in data acquisition system design.
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Each type of Daq device connects to the computer in a different way: • A DaqBook/2000 Series product is a primary data acquisition device which resides external to a PC. These devices connect directly to computer’s Ethernet port, or to an Ethernet network via a hub.
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Optional Software DaqViewXL, DASYLab * The list of DBK cards and modules continues to grow. For information regarding new and upcoming products consult out website, your sales representative, or contact the factory directly. DaqBook/2000 Series and DaqOEM/2000 Series Daq Systems 958795...
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(p/n 457-0905). As a part of product support, this manual is automatically loaded onto your hard drive during software installation. The default location is the Programs directory, which can be accessed through the Windows Desktop. Daq Systems DaqBook/2000 Series and DaqOEM/2000 Series 958795...
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A copy of the Adobe Acrobat Reader is included on your CD. The Reader provides a means of reading and printing the PDF documents. Note that hardcopy versions of the manuals can be ordered from the factory. DaqBook/2000 Series and DaqOEM/2000 Series Daq Systems 958795...
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Daq Systems DaqBook/2000 Series and DaqOEM/2000 Series 958795...
Overview …… 2-2 Product Features …… 2-2 Synchronous Operation Matrix …… 2-6 DaqBook/2001 and DaqOEM/2001 …… 2-7 DaqBook/2005 and DaqOEM/2005 ….. 2-8 I/O Comparison Matrix for DaqBook/2000 Series and DaqOEM/2000 Series Devices Device Analog Input Analog Output Digital I/O Counter/...
Either one of a unit’s two sync ports, or both, can be used. Note that the total combined length of the Sync cables is not to exceed 15 feet (4.57 m). Chapter 8 includes a block diagram regarding synchronizing multiple units. Device Overviews DaqBook/2000 Series and DaqOEM/2000 Series 898095...
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DBK analog input expansion modules. Channel Selection and Mode Settings The DaqBook/2000 Series and DaqOEM/2000 Series devices each accept up to 16 single ended or up to 8 differential-ended inputs and can be programmed for single-ended or differential-ended on a per channel basis.
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Counter Input Channels The DaqBook/2000 Series and DaqOEM/2000 Series devices allow for synchronous scanning of the 4 16-bit counter input channels. The four 16-bit counter channels can also be cascaded into two 32-bit counter channels. For either cascaded or non-cascaded counter channels each channel can be configured for: •...
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Digital I/O Channels Local 8255 Channels The DaqBook/2000 Series and DaqOEM/2000 Series devices have an implemented Intel 8255 core in the digital I/O logic on the P2 port of the product. With the Intel 8255 there are three 8-bit wide ports available for I/O and one 8-bit wide port for configuration purposes.
Synchronous Operation Matrix The following table applies to DaqBook/2000 Series and the DaqOEM/2000 Series devices. Note that this table is closely related to the comparison table on page 2-1. DaqBook/2020 DaqBook/2001 DaqBook/2005 Operation DaqOEM/2001 DaqOEM/2005 Synchronous Input Analog Main Unit Inputs...
Two 16-bit timer outputs. Each can generate square waves from 16 Hz to 1 MHz. • Configuration through software. There are no switches or jumpers on the DaqBook/2001 or on the DaqOEM/2001. DaqBook/2000 Series and DaqOEM/2000 Series Device Overviews 898095...
In addition, BNC connectors are present for: 4 Counter Inputs, two Timer Outputs, one External TTL Trigger Input, and one External Clock Input. • Mini-TC Connectors – DaqBook/2020 provides connection for 14 thermocouple inputs via mini-TC connectors. Device Overviews DaqBook/2000 Series and DaqOEM/2000 Series 898095...
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Two 16-bit timer outputs. Each can generate square waves from 16 Hz to 1 MHz. • Configuration through software. There are no switches or jumpers on the DaqBook/2020. • 16 differential voltage inputs via BNC connectors. • 14 thermocouple inputs via mini-TC connectors. DaqBook/2000 Series and DaqOEM/2000 Series Device Overviews 898095...
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2-10 Device Overviews DaqBook/2000 Series and DaqOEM/2000 Series 898095...
DaqBook/2001, DaqOEM/2001, DaqBook/2005, & DaqOEM/2005 Note: The 4 channel analog output applies to DaqBook/2001 and DaqOEM/2001. It does not apply to DaqBook/2005 or to DaqOEM/2005. Block Diagram for use with DaqBook/2001, DaqOEM/2001, DaqBook/2005, & DaqOEM/2005 DaqBook/2000 Series and DaqOEM/2000 Series Block Diagrams 966895...
Detail “TC” (Thermocouple Input Circuitry) for DaqBook/2020 Detail “V” (Differential Voltage Input Circuitry) for DaqBook/2020 DaqBook/2000 Series and DaqOEM/2000 Series Block Diagrams 966895...
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Block Diagrams DaqBook/2000 Series and DaqOEM/2000 Series 966895...
Two 16-bit Timer Output signals via BNC connectors (T0 and T1). • Trigger – BNC for TTL triggering of an acquisition. • External Clock – BNC for clocking each scan of an acquisition via an external clock. DaqBook/2000 Series and DaqOEM/2000 Series Connectors, Indicators, Cables, & Pinouts 898095...
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SYNC (Qty of 2) – Two “synchronization ports” provide a means of synchronizing up to four DaqBook/2000 Series units in regard to post-trigger scanning. The ports accept CA-74-1 and CA-74-5 RJ-11, 6-conductor type cables. Total combined cable length is not to exceed 15 feet (4.57 m).
SYNC (Qty of 2) – Two “synchronization ports” provide a means of synchronizing up to four DaqBook/2000 Series units in regard to post-trigger scanning. The ports accept CA-74-1 and CA-74-5 RJ-11, 6-conductor type cables. Total combined cable length is not to exceed 15 feet (4.57 m).
DaqOEM/2001 and DaqOEM/2005 The DaqOEM/2000 Series boards include all the analog, digital, and frequency I/O functionality that is found in their DaqBook/2000 Series counterparts. The DaqOEM/2000 Series boards are each powered by user-supplied +10 to +30 VDC input at 15W via a DIN5 or 2-pin Molex connector.
Cables Should you need help in regard to cables or have any other product inquiries please contact the factory. Cables for use with DaqBook/2000 Series Devices Description Part No. Molded expansion cable. Connects a DBK CA-255-2T module to a DaqBook, 2 in.
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Connectors, Indicators, Cables, & Pinouts DaqBook/2000 Series and DaqOEM/2000 Series 898095...
Pinouts P1 and JP1 – Analog I/O …… 4-8 P2 and JP2 – Digital I/O …… 4-9 P3 and JP3 – Pulse/Frequency/Digital I/O (Does not apply to DaqBook/2020E)…… 4-10 CAUTION Turn off power to all devices connected to the system before connecting cables or setting configuration jumpers and switches.
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P1 and JP1 Analog I/O P1, DB37 Connector for DaqBook/2000 Series Devices JP1, 40-pin header for DaqOEM/2000 Series Boards This notch is at the edge of the board. P1 Pin Signal Name Description JP1 Pins +5 Volts Expansion +5 V power...
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P2 and JP2 Digital I/O P2, DB37 Connector for DaqBook/2000 Series Devices JP2, 40-pin header for DaqOEM/2000 Series boards. This side is the outer edge of the board. In regard to orientation, note that JP1 would appear just below this JP2 header.
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P3 and JP3 Pulse/Frequency/Digital I/O JP3, 40-pin header for DaqOEM/2000 Series boards. This notch is at the edge of the board. P3 Pin Signal Name Description JP3 Pin BNC /2020 Correlation DGND Digital Ground DGND Digital Ground Digital 7 P3 Digital Port Bit 7 Digital 6 P3 Digital Port Bit 6 Digital 5...
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Software Overview …… 5-1 Out-of-the-Box Software …… 5-1 Drivers for Third-party, Icon-driven Software …… 5-2 Language Drivers …… 5-2 Overview The Daq devices have software options capable of handling most applications. Three types of software are available: • Out-of the-box graphical programs, e.g., DaqView, DaqViewXL, and post acquisition data analysis programs such as eZ-PostView, eZ-TimeView, and eZ-FrequencyView.
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C/C++, and Visual Basic. The latest software is a 32-bit version API. DaqBook/2000 Series devices are supplied with DaqX Subroutine API Libraries. These provide complete support for all of the functionality available on each data acquisition device in Visual Basic®, and C/C++.
Step 6 - Configure Device Network Settings using DaqIPConfig …… 6-10 Step 7 - Configure and Test the System using the Daq Configuration …… 6-11 Connecting a DaqBook/2000 Series Device to the Ethernet The DaqBook/2000 and DaqOEM/2000 Series devices connect directly to an Ethernet port on a PC or network hub via a built-in 10/100BaseT Ethernet interface.
CAUTION Turn off power to the system devices and externally connected equipment before connecting cables. Electric shock or damage to equipment can result even under low-voltage conditions. Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.) Minimum System Requirements Reference Note: Adobe PDF versions of user manuals will automatically install onto your hard drive as a part of product PC system with Pentium®...
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In the following figure a DaqBook/2020 is connected to the Ethernet through a network hub/switch. At least one computer is also connected to the hub. The other DaqBook/2000 Series and DaqOEM/2000 Series devices can be connected directly to the hub/switch in the same manner.
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LAN with a DHCP Server (Local Area Network with a Dynamic Host Configuration Protocol server) Many corporations use the LAN/Server with DHCP arrangement for their networks. In this type of setup several computers are typically connected to a network that makes use of a DHCP server. In addition, the primary data acquisition device, e.g., DaqBook/2020, is connected to the network hub/switch.
STEP 3 – Connect the System Components Reference Note: For information regarding connections, refer to Chapter 4, Connectors, Indicators, Cables, & Pinouts. What you will need to connect a DaqBook/2000 or DaqOEM/2000 Series device to the Ethernet: • An available connection to the Ethernet. The connection can be either - an Ethernet jack on a computer or - an Ethernet jack on a hub that is connected to the Ethernet.
STEP 4 – Power-up the System What you will need: A power supply with a range of +10 VDC to +30 VDC. The power supply needs to have a male DIN5 connector. Note: The switching-mode power supply that is commonly used with these systems has an input range of 100 VAC to 240 VAC at 50 Hz to 60 Hz.
STEP 5 – Configure the Computer’s Network Settings [Applies to “dedicated networks” only] If using a LAN (Local Area Network), which has a DHCP server, skip this section and continue with STEP 7 - Configure and Test the System using the Daq*Configuration Applet (page 6-11). If using a LAN (Local Area Network), which has no DHCP server, skip this section and continue with STEP 6 - Configure Device Network Settings using DaqIPConfig (page 6-10).
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Local Area Connection Properties 5. Double-click the “Internet Protocol (TCP/IP)” component (previous figure). The “Internet Protocol (TCP/IP) Properties” box will appear (following figure). Internet Protocol (TCP/IP) Properties Configuring the System for Operation DaqBook/2000 and DaqOEM/2000 Series 898095...
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Configure the Computer’s TCP/IP settings as follows. Internet Protocol (TCP/IP) Properties 6. Select the “Use the following IP Address” radio button. 7. Set the IP address field to 10.0.0.x where x is some number from 1 to 255. Make sure that each computer on the dedicated network has a unique IP address.
1. Locate the DaqIPConfig Applet. Locate the DaqIPConfig applet by navigating from the Windows’ Desktop as follows: Start Menu ⇒ Programs ⇒ IOtech DaqX Software ⇒ DaqIPConfig 2. Open the DaqIPConfig Applet. Click on the DaqIPConfig selection to open the applet.
If your device is a DaqOEM/2001 or a DaqOEM/2005 you will select DaqBook/2001 or DaqBook/2005, respectively. This is because the DaqOEM/2000 Series boards are electronically and functionally identical to their DaqBook/2000 Series counterparts. DaqBook/2000 and DaqOEM/2000 Series Configuring the System for Operation...
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3. Set the properties of the first-level device. In this step you will set the device properties according to one of the following two methods, depending on whether you have a “Dedicated Network” or a “LAN with DHCP Server Network.” Illustrations of the network types are provided on page 6-3.
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4. Test the system connections. Make sure the device has been properly installed and is powered-on. b. Make sure all cables are properly and securely connected. Click the “Test Hardware” tab. d. Click the <TCP/IP Test> button. This tests the Transmission Control Protocol / Internet Protocol.
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Reference Notes: Depending on your application and system setup, related information can be found in the following sources: The DBK Options Manual (p/n 457-0905). The Programmer’s Manual, (p/n 1008-0901). Note: You can access PDF documents directly from the opening screen of the data acquisition CD via the <View PDFs>...
CE Compliance & Noise Considerations Overview ……7-1 CE Standards and Directives …… 7-1 Safety Conditions ……7-2 Emissions/Immunity Conditions ……7-2 CE Enhancements for DBKs .…… 7-3 CE Compliance for System Expansion …… 7-3 Noise Considerations …… 7-4 Overview CE-compliant products bear the “CE” mark and include a Declaration of Conformity stating the particular specifications and conditions that apply.
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For clarification, terms used in some Declarations of Conformity include: • pollution degree: any addition of foreign matter, solid, liquid or gaseous (ionized gases) that may produce a reduction of dielectric strength or surface resistivity. Pollution Degree I has no influence on safety and implies: the equipment is at operating temperature with non-condensing humidity conditions;...
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CE Enhancements for DBKs The following CE enhancements are detailed in the DBK Cards and Modules User’s Manual (p/n 457-0905). • DBK41/CE • Edge Guard (for DBK5, DBK8, and DBK44) • Applicable cables and connectors CE Compliance for System Expansion The DaqBook/2000 and DaqOEM/2000 Series devices are CE compliant at the time they leave the factory, and will remain in compliance providing that the conditions stated on their respective Declaration of Conformity cards continue to be met.
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Noise Considerations Controlling electrical noise is imperative because it can present problems even with the best measurement equipment. Most laboratory and industrial environments suffer from multiple sources of electrical noise. For example, AC power lines, heavy equipment (particularly if turned on and off frequently), local radio stations, and electronic equipment can create noise in a multitude of frequency ranges.
Connect the Ground Line This ground line connection procedure is only required if you are not using a shielded Ethernet cable [e.g., IOtech’s CA-242] connected to an earth-grounded PC. CAUTION Use care when connecting the ground line to the acquisition device and the PC.
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Install the Ferrite Inductive Collars 1. Place one ferrite collar at each end of the Ethernet cable. Snap the two collars shut. See photos. 2. Place the remaining ferrite collar next to the DIN5 connector on the power cable. Snap the collar shut. Use a tie-wrap (one per ferrite collar) to secure each collar to its respective cable.
Taking Measurements Introduction …… 8-1 Scanning …… 8-1 Triggering …… 8-2 Synchronous I/O Operations…… 8-3 Asynchronous I/O Operations …… 8-7 Using DBK Cards and Modules for Signal Conditioning ….. 8-8 Introduction With signal lines connected and a system up and running you can begin acquiring data. Specific connector details and pinouts are provided in chapter 4.
Triggering Triggering can be the most critical aspect of acquiring data. DaqBook/2000 and DaqOEM/2000 Series devices support a full complement of trigger modes to accommodate a wide variety of applications. Multi-unit synchronization via the SYNC ports does not support pre-trigger data. Only post-trigger data can be collected and time correlated between the units.
Pre- and Post-Triggering Modes. Six modes of pre- and post-triggering are supported, providing a wide variety of options to accommodate any measurement requirement. When using pre-trigger, the user must use software-based triggering to initiate an acquisition. • No pre-trigger, post-trigger stop event. This, the simplest of modes, acquires data upon receipt of the trigger, and stops acquiring upon receipt of the stop-trigger event.
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DaqBook/2020 uses BNC connectors for EXTCLK and TRIGGER inputs. The other devices use pins as indicated in notes 1 and 2. Synchronization Model for DaqBook/2000 and DaqOEM/2000 Series Devices, Note 1: For DaqBook/2001 and DaqBook/2005, the clock signal is from P1, pin 20. For DaqOEM/2000 Series devices, the clock signal is from JP1, pin 2.
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SYNC Notes: • When a DaqBook is programmed as a synchronization slave, the TTL trigger source is automatically derived from the SYNC port. • When a DaqBook is programmed as a synchronization master, it will output its trigger condition on the SYNC port. •...
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Digital I/O Channels There are 24 Digital I/O channels available to DaqBook/2020; and 40 available to DaqBook/2001, /2005, and DaqOEM/2001 and /2005. The channels are grouped as follows: 8 Channels, A0 through A7 from P2 [or JP2] Port A 8 Channels, B0 through B7 from P2 [or JP2] Port B 8 Channels, C0 through C7 from P2 [or JP2] Port C 16 Channels, Digital 0 through Digital 15 from P3 [or JP3] These 16 channels do not apply to DaqBook/2020.
Asynchronous I/O Operations Each DaqBook allows asynchronous input of any counter or digital channel that is not currently configured for synchronous acquisition. The circuitry allows for asynchronous output to any D/A channels that are not currently configured for waveform output. Likewise, for DaqBook/2001, /2005 and DaqOEM/2001 and /2005 the 16-bit P3 [or JP3] digital port can be used for both asynchronous input and output operations.
Counter Input Channels (CTR0, CTR1, CTR2, CTR3) DaqBooks and DaqOEMs have counter input capabilities and have the ability to read counter input providing that the counter channel is not configured for synchronous acquisition. As in the case of synchronous operations the four 16-bit counter input channels can be used individually or cascaded into two 32-bit counter channels.
Note: DaqCal is installed automatically from your data acquisition CD as a part of product support. This takes place during software installation. DaqCal’s default location is the IOtech DaqX Software folder, in the Programs group. 2. When DaqCal opens you will be prompted to select your device from a list. After doing so, simply follow the illustrated on-screen instructions.
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Calibration DaqBook/2000 and DaqOEM/2000 Series 959095...
During installation you should review the ReadMe files when prompted to by the program. The Install CD-ROM includes: • DaqBook/2000 Series Windows NT/2000/XP driver • DaqX.DLL (32-bit API) for DaqBook/2000 Series • Microsoft C/C++ API support • Microsoft VB API support •...
Ethernet Problems • Make sure the Ethernet network is not experiencing technical problems. Check with your Network Administrator. • Ensure that your system is properly configured in the Daq*Configuration Applet [located in the Windows Control Panel]. If a device is not configured correctly it will not be accessible from an application.
Frequently Asked Questions (1) Topic: Environmental Factors Question: What environments are the products intended for? Answer: Refer to the product specifications in regard to operating and storage temperature ranges, and relative humidity. Note that system components are not intended to be exposed to harsh environments and should always be protected from snow, rain, extreme dust, and harsh sun.
If you want to Expand or Enhance Your DaqBook System . . . You can visit our internet site at http//:www.iotech.com to find the latest accessories, expansion cards and modules. You can also call our sales department directly at (440) 439-4091.
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10-6 Troubleshooting & Customer Support DaqBook/2000 and DaqOEM/2000 - 897995 IO version...
Specifications DaqBook/2020, /2001, /2005, DaqOEM/2001, and DaqOEM/2005 General Supply Voltage Range: 10 to 30 VDC Power Required: 15W, assuming no DBK options Power Available for External Signal Conditioning & Expansion Options: 5V at 1A, ±15V at 500 mA, each not to exceed 7W on DaqBook/2020;...
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Specifications are subject to change without notice. Settling Time: 5 µs maximum to 1 LSB for full-scale step Temperature Coefficient: ±(10ppm +0.3 LSB)/°C outside the range of 0° to 30°C Input Impedance: 10 MΩ for single-ended; 20 MΩ for differential Bias Current: <1nA at 0°...
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Specifications are subject to change without notice. Thermocouple Input Specifications for DaqBook/2020 Mini-TC Connectors TC/mV Connectors: 14 Mini-TC connectors, oriented in 2 rows of 7 Inputs: 14 differential TC/mV inputs, open TC detection per channel TC Types: J, K, T, E, S, R, B, N28, N14; x100 voltage Input Impedance: 40 MΩ...
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Specifications are subject to change without notice. Input Sequencer Analog, digital and counter inputs can be scanned synchronously based either on an internal programmable timer, or an external clock source. Analog and digital outputs can be synchronized to either of these clocks. Scan Clock Sources: 2 Internal, programmable from 5 µs to 5.96 hours maximum in 1 µs steps External, TTL level input up to 200 kHz maximum...
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Specifications are subject to change without notice. 5. Counter/Totalizer Triggering: Counter/totalizer inputs can trigger an acquisition. User can select to trigger on a frequency or on total counts that are equal, above, below, or within/outside of a window. Latency: One scan period maximum. 6.
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Specifications are subject to change without notice. Frequency/Pulse Counters Counter inputs can be scanned synchronously along with analog and digital scanned inputs, based either on internal programmable timer, or an external clock source. Bus mastering DMA provides CPU and system- independent data transfers, insuring data acquisition performance irrespective of other system activities.
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Specifications are subject to change without notice. Accessories and Cables Cables for use with DaqBook/2000 Series Devices Description Part No. Molded expansion cable. Connects a DBK CA-255-2T module to a DaqBook, 2 in. Molded expansion cable. Connects a DBK CA-255-4T module to a DaqBook, 4 in.
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Specifications are subject to change without notice. Manuals Manual Set (Set #1121-0900). This is a hardcopy set of manuals that is available for purchase. The set includes the following three manuals: DaqBook/2000 and DaqOEM/2000 Series User’s Manual (p/n 1121-0901) Programmer’s Manual for developing custom programs using API commands. (p/n 1008-0901) DBK Option Cards &...
Glossary A collection of scans acquired at a specified rate as controlled by the sequencer. Acquisition A signal of varying voltage or current that communicates data. Analog A circuit or device that converts analog values into digital values, such as binary bits, for use in Analog-to-Digital Converter (ADC) digital computer processing.
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A circuit or device that converts digital values (binary bits), into analog signals. Digital-to-Analog Converter (DAC) DIP switch A DIP switch is a group of miniature switches in a small Dual In-line Package (DIP). Typically, users set these switches to configure their particular application. Differential mode The differential mode measures a voltage between 2 signal lines for a single channel.
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An event to start a scan or mark an instant during an acquisition. The event can be defined in Trigger various ways; e.g., a TTL signal, a specified voltage level in a monitored channel, a button manually or mechanically engaged, a software command, etc. Some applications may use pre- and post-triggers to gather data around an instant or based on signal counts.
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