USB-2405 - Mouser Electronics
USB-2405
USB 2.0-based Dynamic Signal Acquisition Module
User’s Manual
Manual Rev.:
2.00
Revision Date:
July 5, 2013
Part No:
50-1Z148-1000
Advance Technologies; Automate the World.
Revision History
ii
Revision
Release Date
Description of Change(s)
2.00
July 5, 2013
Initial release
USB-2405
Preface
Copyright 2013 ADLINK Technology, Inc.
This document contains proprietary information protected by copyright. All rights are reserved. No part of this manual may be reproduced by any mechanical, electronic, or other means in any form
without prior written permission of the manufacturer.
Disclaimer
The information in this document is subject to change without prior
notice in order to improve reliability, design, and function and does
not represent a commitment on the part of the manufacturer.
In no event will the manufacturer be liable for direct, indirect, special, incidental, or consequential damages arising out of the use or
inability to use the product or documentation, even if advised of
the possibility of such damages.
Environmental Responsibility
ADLINK is committed to fulfill its social responsibility to global
environmental preservation through compliance with the European Union's Restriction of Hazardous Substances (RoHS) directive and Waste Electrical and Electronic Equipment (WEEE)
directive. Environmental protection is a top priority for ADLINK.
We have enforced measures to ensure that our products, manufacturing processes, components, and raw materials have as little
impact on the environment as possible. When products are at their
end of life, our customers are encouraged to dispose of them in
accordance with the product disposal and/or recovery programs
prescribed by their nation or company.
Trademarks
Product names mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks
of their respective companies.
Preface
iii
Conventions
Take note of the following conventions used throughout this
manual to make sure that users perform certain tasks and
instructions properly.
Additional information, aids, and tips that help users perform
tasks.
NOTE:
CAUTION:
WARNING:
iv
Information to prevent minor physical injury, component damage, data loss, and/or program corruption when trying to complete a task.
Information to prevent serious physical injury, component
damage, data loss, and/or program corruption when trying to
complete a specific task.
Preface
USB-2405
Table of Contents
Revision History...................................................................... ii
Preface .................................................................................... iii
List of Figures ....................................................................... vii
List of Tables.......................................................................... ix
1 Introduction ........................................................................ 1
1.1
Overview.............................................................................. 1
1.2
Features............................................................................... 1
1.3
Applications ......................................................................... 2
1.4
Specifications....................................................................... 2
1.4.1
General Specifications................................................ 2
1.4.2
Analog Input (AI)......................................................... 2
1.4.3
DC accuracy @25°C .................................................. 3
1.4.4
AC Dynamic Performance (typical, 25°C) .................. 3
1.4.5
Digital I/O.................................................................... 5
1.5
Software Support ................................................................. 5
1.6
Driver Support for Windows................................................. 6
1.7
Utilities for Windows ............................................................ 6
1.8
Overview and Dimensions ................................................... 8
1.9
1.8.1
Module........................................................................ 8
1.8.2
Module Stand ........................................................... 10
Connections....................................................................... 16
2 Getting Started ................................................................. 17
2.1
Unpacking the USB-2405 .................................................. 17
2.2
Connecting the USB-2405 Module .................................... 17
2.3
Device ID ........................................................................... 19
2.4
Device Mounting ................................................................ 20
Table of Contents
v
2.5
2.4.1
Rail Mounting............................................................ 20
2.4.2
Wall Mounting ........................................................... 23
Hardware Configuration ..................................................... 25
3 Operation ........................................................................... 27
3.1
Functional Layout............................................................... 27
3.2
Analog Input....................................................................... 28
3.3
3.2.1
Analog Input Front End Configuration ...................... 28
3.2.2
AI Data Format ......................................................... 29
3.2.3
Sampling Rate .......................................................... 30
3.2.4
Data Transfer............................................................ 31
3.2.5
Anti-Aliasing Filter and Frequency Response........... 31
Triggering........................................................................... 33
3.3.1
3.4
Analog Input Trigger Source..................................... 33
Programmable Function I/O............................................... 39
3.4.1
Static Digital Input/Output ......................................... 39
3.4.2
Frequency Counter ................................................... 39
3.4.3
Pulse Output ............................................................. 39
3.4.4
Digital Trigger IN for Continuous Analog Input ......... 40
3.4.5
Synchronization Sample Clock IN ............................ 40
4 Calibration ......................................................................... 41
4.1
Loading Calibration Constants........................................... 41
4.2
Auto-Calibration ................................................................. 41
4.3
Saving Calibration Constants............................................. 42
Important Safety Instructions............................................... 43
Getting Service ...................................................................... 45
vi
Table of Contents
USB-2405
List of Figures
Figure 1-1:
Figure 1-2:
Figure 1-3:
Figure 1-4:
Figure 1-5:
Figure 1-6:
Figure 1-7:
Figure 1-8:
Figure 1-9:
Figure 1-10:
Figure 1-11:
Figure 2-1:
Figure 2-2:
Figure 2-3:
Figure 2-4:
Figure 2-5:
Figure 2-6:
Figure 2-7:
Figure 3-1:
Figure 3-2:
Figure 3-3:
Figure 3-4:
Figure 3-5:
Figure 3-6:
Figure 3-7:
Figure 3-8:
Figure 3-9:
Figure 3-10:
Figure 3-11:
Figure 3-12:
Figure 3-13:
Figure 3-14:
List of Figures
U-Test Interface.......................................................... 7
USB-2405 Module Front View .................................... 9
USB-2405 Module Side View ..................................... 9
USB-2405 Module Rear View................................... 10
Module, Stand, and USB Cable................................ 11
Module, Stand, & Wall Mount Kit Side View (w/ Connections)......................................................................... 12
Module In Stand Front View ..................................... 13
Module Stand Top View ........................................... 14
Module Stand Side Cutaway View ........................... 15
Module Stand Front View ......................................... 15
BNC Connector Polarity ........................................... 16
USB-2405 Module in Windows Device Manager...... 18
Device ID Selection Control...................................... 19
Rail Mount Kit ........................................................... 20
Module Pre-Rail Mounting ........................................ 21
Module Rail-Mounted ............................................... 22
Wall Mount Holes ..................................................... 23
USB-2405 Module with Wall Mount Apparatus ........ 24
USB-2405 Functional Block Diagram ....................... 27
USB-2405 Analog Front End .................................... 28
Excitation Current for IEPE Sensor Measurement ... 29
Input Frequency Response for High Resolution Mode
(Fs=51.2kS/s) ........................................................... 32
Input Frequency Response for High Speed Mode
(Fs=102.4kS/s) ......................................................... 33
Below-Low Analog Triggering................................... 34
Above-High Analog Triggering ................................. 35
Digital Triggering ...................................................... 35
Post Trigger without Retrigger.................................. 36
Pre-trigger Mode Operation (valid trigger only) ........ 36
Pre-trigger Mode Operation (w/ invalid trigger) ........ 37
Delay-Trigger Mode Operation ................................. 37
Middle-Trigger Acquisition ........................................ 38
Gated Trigger ........................................................... 38
vii
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viii
List of Figures
USB-2405
List of Tables
Table 1-1: U-Test Interface Legend .................................................. 7
Table 3-1: Signal Source-Card Configuration ................................. 28
Table 3-2: USB-2405 Input Ranges................................................ 30
List of Tables
ix
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x
List of Tables
USB-2405
1
Introduction
1.1 Overview
The USB-2405 is a 24-bit high-performance dynamic signal acquisition USB module, equipped with 4 simultaneous-sampling analog input channels sampling up to 128 kS/s per channel. The
USB-2405 also features software selectable AC or DC coupling
input configuration, and built-in high precision 2 mA excitation current to measure integrated electronic piezoelectric (IEPE) sensors
such as accelerometers and microphones.
The USB-2405 delivers high precision DC and dynamic measurement performance with very low temperature drift. The onboard
24-bit Sigma-Delta ADC supports anti-aliasing, which suppresses
modulator and signal out-of-band noise and provides usable signal bandwidth of the Nyquist rate, making it ideal for high dynamic
range signal measurement in vibration and acoustic applications.
The USB-2405 supports digital and analog trigger sources and
flexible trigger modes, including post, delay, middle, gated, and
pre-triggering, which acquires data efficiently without post processing. The USB-2405 is USB bus powered and equipped with
BNC connectors and removable spring terminals for easy device
connectivity.
1.2 Features
X
Hi-Speed USB 2.0
X
USB bus powered
X
24-bit Sigma-Delta ADC with built-in anti-aliasing filter
X
4-CH simultaneous sampling analog input, up to 128kS/s
X
AC or DC input coupling, software selectable
X
Analog or digital triggering
X
Supports 2mA excitation output on each analog input channel for IEPE sensor measurement
X
Full auto-calibration
X
Ready-to-use testing application (U-Test) provided
Introduction
1
1.3 Applications
X
Vibration testing
X
Machine condition monitoring
X
Acoustic measurement
X
Environmental noise analysis
1.4 Specifications
1.4.1
General Specifications
Physical, Power, and Operating Environment
Interface
Hi Speed USB 2.0 compatible, mini-USB connector
Dimensions
156.5 (L) x 114 (W) x 41.3 (H) mm (6.16 X 4.49 X
1.63 in.)
I/O Connector
Four BNC connectors and 4-pin removable spring
terminals
Power requirement
USB power (5 V @ 400 mA)
Operating environment
Ambient temperature: 0 to 55°C
Relative humidity: 10% to 90%, non-condensing
Storage environment
Ambient temperature: -20 to 70 °C
Relative humidity: 5% to 95%, non-condensing
1.4.2
Analog Input (AI)
Channels
4 (simultaneous-sampling)
ADC resolution
24-bit
ADC type
Delta-sigma
Sampling rate
1kHz to 128kHz
Input range
±10V
FIFO buffer size
8kS across all channel
Input configuration
Differential or pseudo-differential
Input impedance
200 kΩ between positive input and
negative input
16.93 kΩ between negative input and
chassis ground
Input coupling
AC or DC, software selectable
2
Introduction
USB-2405
Integrated electronic piezoelectric
(IEPE)
Current: 2 mA or 0 mA, software
selectable
IEPE compliance: 24V
Over-voltage protection
±60V
Input common mode range
±10V
Trigger source
Analog or digital, software selectable
Trigger mode
Post trigger, delay trigger, middle
trigger, gated trigger, pre-trigger, post
or delay trigger with re-triggering
Data transfer
Programmed I/O, continuous (bulk
transfer mode)
1.4.3
DC accuracy @25°C
Offset Error (mV)
Gain Error (%)
Typical
±0.15mV
±0.15mV
Maximum
±0.3mV
±0.3%
1.4.4
AC Dynamic Performance (typical, 25°C)
THD, THD+N (Vin = 8.9 Vpk)
Input Configuration
Input Signal
Frequency (fin)
THD
THD+N
Differential
20Hz to 20kHz
-94dB
-91 dB
20Hz to 46.4kHz
-89 dB
-88 dB
Pseudo-differential
20Hz to 20kHz
-92 dB
-88 dB
20Hz to 46.4kHz
-85 dB
-85 dB
CMRR
AC (20Hz to 1kHz)
Introduction
60 dB
3
Bandwidth
-3dB bandwidth
0.49 x fs (where fs is sampling rate)
AC cut-off frequency (-3dB)
0.4 Hz
AC cut-off frequency (-0.1dB)
2.4 Hz
Flatness
Input Signal Frequency (fin)
Flatness
20Hz to 20kHz
±0.01 dB
20Hz to 46.4kHz
±0.15 dB
Crosstalk
Input Signal Frequency (fin)
Crosstalk
1kHz
-102 dB
46.4kHz
-95 dB
System Noise
Measurement Bandwidth
AI Noise
High Resolution (< 52.734kHz)
50 µVrms
High Speed Mode (52.734 kHz to 128kHz)
65 µVrms
SFDR (Vin = -1 dBFS)
Input Signal Frequency (fin)
SFDR
1kHz
104 dB
Dynamic Range (Vin = -60 dBFS)
4
Input Signal Frequency (fin)
Dynamic
Range
1kHz
100 dB
Introduction
USB-2405
1.4.5
Digital I/O
Channels
2 programmable function I/O
Compatibility
3.3V / TTL (single-ended)
Initial status
Input (pulled low)
Input voltage
Logic low: VIL = 0.8 V max; IIL = 0.2 mA max.
Logic high: VIH = 2.0 V min.; IIH = 0.2 mA max.
Output voltage
Logic low: VOL = 0.8 V max; IIL = 0.2 mA max.
Logic high: VOH = 2.0 V min.; IIH = 24 mA max.
Over-voltage
protection
-2V to +7V
Supporting
modes (only
one can be
selected and
function at a
time, see
Section 3.4:
Programmable
Function I/O
Data Transfer
• Static digital input/output
• PWM output, max. frequency: 4 MHz
• Frequency/Event counter, max.
frequency: 4MHz
• Digital trigger IN
• Synchronization sample clock IN, max.
frequency: 128kHz
Programmed I/O
1.5 Software Support
ADLINK provides comprehensive software drivers and packages
to suit various user approaches to system building. In addition to
programming libraries, such as DLLs, for most Windows-based
systems, ADLINK also provides drivers for application environments such as LabVIEW® and MATLAB®. ADLINK also provide
ActiveXcomponent ware for measurement and SCADA/HMI, and
breakthrough proprietary software. All software options are
included in the ADLINK All-in-One CD.
Be sure to install the driver & utility before using the USB-2405
module.
Introduction
5
1.6 Driver Support for Windows
UD-DASK
UD-DASK is composed of advanced 32/64-bit kernel drivers for
customized DAQ application development. USB-DASK enables
you to perform detailed operations and achieve superior performance and reliability from your data acquisition system. DASK
kernel drivers now support Windows 7/Vista® OS. Please note that
only UD-DASK versions 1.2.2.0627 and later can support the
USB-2405 module.
DAQPilot
DAQPilot is a task-oriented Software Development Kit, supporting
ActiveX Controls/.NET Assembly, Express VI and Polymorphic VI
for LabVIEW and DAQ Toolbox for MATLAB.
You can download and install DAQPilot at:
http://www.adlinktech.com/TM/DAQPilot.html
Please note that only DAQPilot versions 2.6.1.0628 and later can
support the USB-2405.
1.7 Utilities for Windows
U-Test
U-Test is a free and ready-to-use utility which can assist instant
testing and operation of all ADLINK USB DAQ series functions
with no programming. In addition to providing data collection and
monitoring functions, U-Test also supports basic FFT analysis and
provides direct control of analog output and digital I/O with a
user-friendly interface.
6
Introduction
USB-2405
A
B
C
D
Figure 1-1: U-Test Interface
A
Main Menu
B
Device Viewer
C
AI Data View & AO, DIO Control Panel
D
Analog Input Configuration
Table 1-1: U-Test Interface Legend
You can download and install U-Test at: http://www.adlinktech.com/
Introduction
7
1.8 Overview and Dimensions
All dimensions shown are in millimeters (mm)
NOTE:
1.8.1
Module
41.3
45.6
8
Introduction
USB-2405
Figure 1-2: USB-2405 Module Front View
114
156.5
167.5
Figure 1-3: USB-2405 Module Side View
Introduction
9
Figure 1-4: USB-2405 Module Rear View
1.8.2
Module Stand
The multi-function USB-2405 stand is compatible with desk, rail, or
wall mounting. To fix the module in the stand, slide the module
body into the stand until a click is heard. To remove the module
10
Introduction
USB-2405
from the stand, twist the bottom of the stand in a back-and forth
motion and separate from the module.
Figure 1-5: Module, Stand, and USB Cable
Introduction
11
128
167
198
Figure 1-6: Module, Stand, & Wall Mount Kit Side View (w/ Connections)
12
Introduction
USB-2405
114
100
Figure 1-7: Module In Stand Front View
Introduction
13
26
B
20.4
20.4
Figure 1-8: Module Stand Top View
14
Introduction
USB-2405
5.89
1.5
3.4
6
Figure 1-9: Module Stand Side Cutaway View
100
Figure 1-10: Module Stand Front View
Introduction
15
1.9 Connections
The USB-2405 module is equipped with four BNC connectors and
one 4-pin removable spring terminal connector, with pin assignment as labeled.
BNC connector polarity is as shown.
Positive (+)
Negative (-)
Figure 1-11: BNC Connector Polarity
16
Introduction
USB-2405
2
Getting Started
2.1 Unpacking the USB-2405
Before unpacking, check the shipping carton for any damage. If the
shipping carton and/or contents are damaged, inform your dealer
immediately. Retain the shipping carton and packing materials for
inspection. Obtain authorization from your dealer before returning
any product to ADLINK. Ensure that the following items are
included in the package.
Z
USB-2405
Z
Stand
Z
USB cable (2 meter)
Z
Rail mount kit
Z
ADLINK All-in-One CD
Z
Quick Start Guide
2.2 Connecting the USB-2405 Module
WARNING:
The appropriate driver must be installed before you can connect the USB DAQ to the computer system. Refer to
Section 1.6: Driver Support for Windows for driver support
information.
1. Turn on the computer.
2. Connect the USB-2405 module to one USB 2.0 port on
the computer using the included USB cable.
3. The first time the USB-2405 module is connected, a New
Hardware message appears. It will take around 6 seconds to load the firmware. When loading is complete, the
LED indicator on the rear of the USB DAQ module
Getting Started
17
changes from amber to green and the New Hardware
message closes.
4. The USB-2405 module can now be located in the hardware Device Manager, as shown.
Figure 2-1: USB-2405 Module in Windows Device Manager
If the USB-2405 module cannot be detected, the power provided
by the USB port may be insufficient. The USB-2405 module is
exclusively powered by the USB port and requires 400 mA @ 5 V.
18
Getting Started
USB-2405
2.3 Device ID
A rotary control on the rear of the module (as shown) controls
device ID setting and can be set from 0 to 7. The device ID allows
dedicated control of the USB-2405 module irrespective of the connected USB port. When more than one USB module of the same
type is connected, each must be set to a different ID to avoid conflicts and errors in operation.
Figure 2-2: Device ID Selection Control
Getting Started
19
2.4 Device Mounting
2.4.1
Rail Mounting
The multi-function stand can be mounted on the DIN rail using the
rail-mount kit as shown.
Figure 2-3: Rail Mount Kit
20
Getting Started
USB-2405
Figure 2-4: Module Pre-Rail Mounting
Getting Started
21
Figure 2-5: Module Rail-Mounted
22
Getting Started
USB-2405
2.4.2
Wall Mounting
The multi-function stand can be fixed to a wall using four flush
head screws as shown. The four screw holes should be
approximately 3.4 mm in diameter.
Figure 2-6: Wall Mount Holes
Getting Started
23
Figure 2-7: USB-2405 Module with Wall Mount Apparatus
24
Getting Started
USB-2405
2.5 Hardware Configuration
All
remaining
hardware
configurations
are
software
programmable, including sampling/update rate, input/output
channel, input range, and others. Please see the UD-DASK
Function Reference manual for details.
Getting Started
25
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26
Getting Started
USB-2405
3
Operation
Operation of the USB-2405 is described here to assist in
configuration and programming of the module. Functions
addressed include analog input and GPIO.
3.1 Functional Layout
The USB-2405 is equipped with four simultaneous-sampling
analog input channels and two general-purpose digital I/Os
(GPIO).
EEPROM
EEPROM
Control Signal
ADC Front end
24MHz XTAL
ADLINK
FPGA
DI, DO,
Counter,
PWM OUT,
Trigger IN
Cypress
CY7C68013A
A/D
Others
8051 Core 12/24/
48MHz
I2C Interface
GPIO Circuit
2-CH GPIO
Calibration
data
USB INTERFACE
DDS (Direct
Digital
Synthesis)
AI
Calibration
Control
8051 Core
function
24 Bit SigmadeltaAFI
ADC
AI Data and Control
4-CH AI
GPIO
3.3V Supply
USB BUS
+5V Supply
Power
DDR2 SDRAM
3.3 2.5 1.2V
Supply
circuit
DATA
Figure 3-1: USB-2405 Functional Block Diagram
Operation
27
3.2 Analog Input
3.2.1
Analog Input Front End Configuration
Diff input
AI
Calibration
Circuit
Differential/
Psuedodifferential
Switch
Circuit
IEPE
Circuit
AC
Coupling
circuit
ADC Driver
24 Bit ADC
Figure 3-2: USB-2405 Analog Front End
Input Configuration: Differential/Pseudo-Differential
Differential input mode provides anode and cathode inputs of the
BNC connector that respond to signal voltage differences
therebetween. If the signal source is ground-referenced, the
differential input mode can be used for common-mode noise
rejection.
If the signal source is a floating signal, setting pseudo-differential
input mode will provide a reference ground connected to the
cathode input of the BNC through a 20 kΩ resistor.
Recommended configurations for the signal sources are as
follows.
Signal Source
Card Configuration
Floating
Pseudo-differential
Ground-reference
Differential
Table 3-1: Signal Source-Card Configuration
Input Coupling
When DC coupling is selected, DC offset present in the input signal is passed to ADC. DC coupling configuration is indicated when
the signal source has a small offset voltage or if the DC content of
28
Operation
USB-2405
the signal is important. When AC coupling is selected, DC offset
present in the input signal is removed. AC coupling configuration
is indicated when the DC content of the input signals is to be
rejected. AC coupling enables a high pass R-C filter through the
input signal path, with corner frequency (-3dB) about 0.4 Hz.
IEPE Input
For applications utilizing sensors such as accelerometers or
microphones, the USB-2405 provides an excitation current
source.
The excitation current is 2 mA for the IEPE sensors, with DC voltage offset generated because of the excitation current and sensor
impedance. When enabling IEPE current sources, the USB-2405
automatically sets input configuration to AC coupling.
VCC
2mA
Constant
Current
IEPE ON/
OFF
AI Channel
Figure 3-3: Excitation Current for IEPE Sensor Measurement
3.2.2
AI Data Format
When an A/D converter is used, properties of the signal to be
measured must be ascertained to determine the channel to be
Operation
29
used and connections to the card. After A/D conversion, the A/D
data is buffered in a Data FIFO, for transfer to memory for further
processing. Transfer characteristics of various input ranges of the
USB-2405 are as follows, with data format 2’s complement.
Description
Bipolar Analog
Input Range
Full-scale Range
±10V
Least significant bit
1.19uV
FSR-1LSB
9.99999881V
Digital Code
7FFFFFh
Midscale +1LSB
1.19uV
000001h
Midscale
0V
000000h
Midscale –1LSB
-1.19uV
FFFFFFh
-FSR
-10V
800000h
Table 3-2: USB-2405 Input Ranges
3.2.3
Sampling Rate
To drive the sigma-delta ADC, an onboard timebase clock is
applied, with frequency exceeding the sampling rate, produced
from a DDS (Direct Digital Synthesis) chip. The output frequency
of the DDS chip is programmable, with excellent resolution.
DDS Timing/Sampling Rate
30
Mode
High Resolution
High Speed
Sampling Rate
1 kHz ~ 52.734 kHz 52.734 kHz ~ 128
kHz
fCLK/fDATA
512
256
DDS CLK
512kHz to
26.999808MHz
13.499904 MHz to
2.768 MHz
Sampling Rate
Resolution
0.0003 Hz
0.0003 Hz
Operation
USB-2405
3.2.4
Data Transfer
Software Polling Data Transfer (Non-Buffering Programmed I/O)
Polling mode supports flexible timing and is suitable for retrieving
recent data without FIFO buffering latency. The USB-2405 continuously updates the most recently acquired data onto a data port
for specific channels. Data not retrieved in time is overwritten with
new data without notification. The UD-DASK Function Library Reference provides corresponding software API details.
Continuous Acquisition Mode
Differs from software polling mode only in the generation of block
data in continuous acquisition mode without the need to consider
data overwriting or acquiring repeat data in software polling mode.
This mode is suitable for when continuous data is to be acquired in
a fixed and precise time interval. Please note the data buffer size
must be a multiple of 256 in continuous acquisition mode. The
UD-DASK Function Library Reference provides corresponding
software API details.
3.2.5
Anti-Aliasing Filter and Frequency Response
The filter limits the bandwidth of the signal path and rejects
out-of-band noise. The digital filter of the Sigma-Delta ADC sets
the overall frequency response, using multi-stage FIR topology to
provide linear phase with minimal passband ripple and high stopband attenuation. These image frequencies, if present in the signal and not externally filtered, will fold back (or alias) into the
passband, causing errors. The stopband of the ADC provides
100dB attenuation of frequencies that begin just beyond the passband and continue out to ADC over-sampling rate. The USB-2405
provides an anti-aliasing, low-pass, simple RC filter in front of the
ADC inputs to limit possible high amplitude out-of-band signals
and noise.
Operation
31
−3dB Bandwidth (Fs = 51.2KS/s)
5
0
X: 25
Y: −2.058
−5
(dB)
−10
−15
−20
−25
−30
−35
5
10
15
20
Input Signal Frequency (kHz)
25
Figure 3-4: Input Frequency Response for High Resolution Mode
(Fs=51.2kS/s)
32
Operation
USB-2405
−3dB Bandwidth (Fs = 102.4KS/s)
0
X: 50
Y: −2.27
−10
(dB)
−20
−30
−40
−50
−60
5
10
15
20
25
30
35
40
Input Signal Frequency (kHz)
45
50
55
Figure 3-5: Input Frequency Response for High Speed Mode (Fs=102.4kS/s)
3.3 Triggering
The USB-2405 supports flexible trigger sources and trigger modes
for analog input functionality. The trigger source can originate with
software command, external analog, or external digital signal in
continuous analog input mode. Trigger source and mode are programmable by software.
3.3.1
Analog Input Trigger Source
Software Triggering
This trigger mode requires no external trigger signals. The trigger
asserts immediately following execution of the specified function
calls to begin the operation.
Operation
33
External Analog Trigger
The analog multiplexer can select one input channel as the analog
trigger source. That is, one of 4 input channels can be selected as
the analog trigger source. An external analog trigger occurs when
the analog trigger signal crosses above (above high) or below
(below low) the pre-defined voltage level. The range of trigger
level is the full-scale range of the selected input channel and the
resolution is 24-bit. In external analog trigger mode, the first
acquired data starts with a delay time of 1/(sampling rate).
Below-Low Analog Triggering
As shown, the trigger signal is generated when the input analog signal is less than the Low_Threshold voltage.
High_Threshold setting is not used in this triggering situation.
Figure 3-6: Below-Low Analog Triggering
Above-High Analog Triggering
As shown, the trigger signal is generated when the input analog
signal
exceeds
the
High_Threshold
voltage.
Low_Threshold setting is not used in this triggering situation
34
Operation
USB-2405
Figure 3-7: Above-High Analog Triggering
External Digital Triggering
An external digital trigger occurs when a rising or falling edge is
detected on the digital signal connected to the GPIO pin. Trigger
polarity can be programmed using ADLINK software drivers.
Signal level of the external digital trigger signals should be
3/3V/TTL-compatible, with a minimum pulse of 20ns.
NOTE:
Positive-edge
(rising) trigger event
occurs
Negative-edge
(falling) trigger
event occurs
Figure 3-8: Digital Triggering
Trigger Modes
Analog input supports post, delay, middle, gate, post trigger with
retrigger, and delay trigger with retrigger modes.
Operation
35
Post-Trigger Acquisition Mode (no retrigger)
Post-trigger acquisition is indicated in applications where data
is to be collected after a trigger event, as shown.
ƔOperation
start
ƔTrigger Event Occurs
ƔAcquisition start
ƔAcquisition stop
ƔBegin to transfer data to system
Time
Trigger
Data
N samples
Figure 3-9: Post Trigger without Retrigger
Pre-trigger Acquisition (no retrigger)
Collects data before the trigger event, with acquisition starting
once specified function calls are executed to begin the pre-trigger operation, and stopping when the trigger event occurs. If
the trigger event occurs after the specified amount of data has
been acquired, the system stores only data preceding the trigger event by a specified amount, as shown. Note that N must
be equal to or less than 8k samples for all analog input channels.
ƔTrigger Event Occurs
ƔAcquisition stop
ƔBegin to transfer data to
system
ƔOperation start
ƔAcquisition start
Time
Trigger
Data
N samples
This data is
discarded.
Only acquired N
samples will be
transferred back to
system.
Figure 3-10: Pre-trigger Mode Operation (valid trigger only)
36
Operation
USB-2405
The trigger event occurs after the specified amount of data has
been acquired. However, if the trigger event occurs before the
specified amount of data has been acquired, the acquisition
engine ignores the trigger signal until the specified amount of
data has been acquired, as shown.
ƔOperation start
ƔAcquisition start
ƔTrigger signals that occur before
the specified amount of data has
been acquired are ignored
ƔTrigger Event Occurs
ƔAcquisition stop
ƔBegin to transfer data to system
Time
Trigger
Data
N samples
X samples have been acquired
before trigger occurs, where
X<N
Figure 3-11: Pre-trigger Mode Operation (w/ invalid trigger)
Delay-Trigger Acquisition (no retrigger)
Delays data collection after the trigger event, as shown. The delay
count is specified by a 32-bit counter value, such that the maximum delay count is (232-1) when the minimum delay count is 1.
ƔOperation
start
ƔTrigger Event
Occurs
ƔAcquisition start
ƔAcquisition stop
ƔBegin to transfer data
to system
Delay Time
Time
Trigger
Data
N samples
Figure 3-12: Delay-Trigger Mode Operation
Middle-Trigger Acquisition
Middle-trigger acquisition is indicated when data is to be collected
before and after the trigger event. The amount of stored data
Operation
37
before and after trigger event can be set individually (M and N
samples), as shown. Please note that M+N must be equal to or
less than 8k samples for all analog input channels, and that the
trigger event can only be accepted when the specified amount of
data has been acquired (M samples), otherwise the trigger event
will be ignored.
ƔTrigger Event Occurs
ƔAcquisition stop
ƔBegin to transfer data to
system
ƔOperation start
ƔAcquisition start
Time
Trigger
Data
N samples
This data is
discarded.
Only acquired N
samples will be
transferred back to
system.
Figure 3-13: Middle-Trigger Acquisition
Gated Trigger
Gated-trigger acquisition is indicated in applications where data is
to be collected when trigger events are set to level high/low, and
acquisition suspended when trigger events are set to the opposite
level. The process repeats until the specified amount of data is
acquired.
ƔOperation start
ƔAcquisition start
ƔTrigger event occurs
(high active)
ƔTrigger event occurs
(high active)
Time
Trigger
Data
ƔƔƔƔ
M samples
N samples
Figure 3-14: Gated Trigger
Post-Trigger or Delay-Trigger Acquisition with Re-Trigger
Post-trigger or delay-trigger acquisition with re-trigger function is
indicated in applications where data is to be collected after several
trigger events. The number of scans after each trigger and the
38
Operation
USB-2405
re-trigger number are valid from 1 to the buffer size allocated in
kernel space. The process repeats until the specified amount of
re-trigger signals is detected.
3.4 Programmable Function I/O
The USB-2405 supports powerful programmable I/O function provided by an FPGA chip, configurable as static digital input/output,
32-bit frequency counters, pulse output, synchronization sample
clock IN, and trigger IN. These signals are single-ended and 3.3 V/
TTL-compliant.
3.4.1
Static Digital Input/Output
Programmable function I/O can be used as static digital inputs or
outputs, with I/O lines readable and writeable by software polling,
with sample and update rate fully controlled by software timing.
3.4.2
Frequency Counter
Calculates base clocks occurring within a period (rising edge to
rising edge or falling edge to falling edge) of the repetitive input
signal, which is then converted to frequency value. Counter polarity can be adjusted to rising edge active or falling edge active, with
maximum frequency measurable of 4MHz.
3.4.3
Pulse Output
The GPIO can also simulate a pulse output. By setting a varying
amount of Pulse_initial_cnt and Pulse_length_cnt, varying pulse
frequencies and duty cycles can be obtained. The maximum output frequency is 4MHz, as shown.
Pulse_initial_count=7
Pulse_length_count=8
Timebase
PWM OUT
Operation
39
Calculation of the pulse frequency and duty cycle is as follows.
FTimebase
Pulse _ initial _ cnt Pulse _ length_ cnt
Pulse _ length_ cnt
Duty PWM
Pulse _ initial _ cnt Pulse _ length_ cnt
FPWM
3.4.4
Digital Trigger IN for Continuous Analog Input
The GPIO can be programmed as the digital trigger source for
continuous analog input acquisition. Please see External Digital
Triggering for details.
3.4.5
Synchronization Sample Clock IN
To synch multiple devices, the GPIO can be programmed as external sample clock input, with the same trigger signal and external
sample clock applicable to multiple USB-2405s to achieve more
than 4 channel synchronization without phase delay. Note the synchronization sample clock must be continuous, with valid frequency range from 1 kHz to 128 kHz.
40
Operation
USB-2405
4
Calibration
This chapter introduces the process of calibrating the USB-2405 to
optimize AD measurement.
4.1 Loading Calibration Constants
The USB-2405 is factory-calibrated before shipment, with associated calibration constants of the TrimDACs firmware written to the
onboard EEPROM. TrimDACs firmware is the algorithm in the
FPGA. Loading calibration constants entails loading the values of
TrimDACs firmware stored in the onboard EEPROM.
ADKLINK provides a software utility that automatically reads the
calibration constants, if necessary.
Dedicated space for storing calibration constants is provided in the
EEPROM. In addition to the default bank of factory calibration constants, there is one user-utilization bank, allowing loading of the
TrimDACs firmware values either from the original factory calibration or a subsequently-performed calibration.
Since measurement errors may vary depending on time and temperature, it is recommended that the USB-2405 module be calibrated in the existing testing environment, as follows.
4.2 Auto-Calibration
The USB-2405 module should be warmed up for at least 15
minutes before initiating auto-calibration.
NOTE:
The USB-2405 auto-calibration utility measures and corrects
almost all calibration errors with no requirement for external signal
connection, reference voltage, or measurement devices. An
onboard calibration reference is provided to ensure accuracy of
auto-calibration. The reference voltage is measured in the production line by a digital potentiometer and compensated in the software. The calibration constant is stored after auto-calibration.
Calibration
41
4.3 Saving Calibration Constants
Factory-calibrated constants are permanently stored in a bank of
the onboard EEPROM and cannot be modified. When the device
is recalibrated through auto-calibration, the software stores the
new constants in a user-configurable section of the EEPROM. To
restore original factory calibration settings, the software can copy
the factory-calibrated constants to the user-configurable section of
the EEPROM. When auto-calibration is complete, the new calibration constants can be saved to the user-configurable banks in the
EEPROM.
42
Calibration
USB-2405
Important Safety Instructions
For user safety, please read and follow all instructions,
WARNINGS, CAUTIONS, and NOTES marked in this manual
and on the associated equipment before handling/operating the
equipment.
X
Read these safety instructions carefully.
X
Keep this user’s manual for future reference.
X
Read the specifications section of this manual for detailed
information on the operating environment of this equipment.
X
When installing/mounting or uninstalling/removing
equipment:
Z
X
Turn off power and unplug any power cords/cables.
To avoid electrical shock and/or damage to equipment:
Z
Keep equipment away from water or liquid sources;
Z
Keep equipment away from high heat or high humidity;
Z
Keep equipment properly ventilated (do not block or
cover ventilation openings);
Z
Make sure to use recommended voltage and power
source settings;
Z
Always install and operate equipment near an easily
accessible electrical socket-outlet;
Z
Secure the power cord (do not place any object on/over
the power cord);
Z
Only install/attach and operate equipment on stable
surfaces and/or recommended mountings; and,
Z
If the equipment will not be used for long periods of time,
turn off and unplug the equipment from its power source.
Important Safety Instructions
43
X
Never attempt to fix the equipment. Equipment should only
be serviced by qualified personnel.
A Lithium-type battery may be provided for uninterrupted, backup
or emergency power.
Risk of explosion if battery is replaced with an incorrect type;
please dispose of used batteries appropriately.
WARNING:
X
44
Equipment must be serviced by authorized technicians
when:
Z
The power cord or plug is damaged;
Z
Liquid has penetrated the equipment;
Z
It has been exposed to high humidity/moisture;
Z
It is not functioning or does not function according to the
user’s manual;
Z
It has been dropped and/or damaged; and/or,
Z
It has an obvious sign of breakage.
Important Safety Instructions
USB-2405
Getting Service
Contact us should you require any service or assistance.
ADLINK Technology, Inc.
Address: 9F, No.166 Jian Yi Road, Zhonghe District
New Taipei City 235, Taiwan
ᄅ‫ؑק‬խࡉ೴৬ԫሁ 166 ᇆ 9 ᑔ
Tel:
+886-2-8226-5877
Fax:
+886-2-8226-5717
Email:
service@adlinktech.com
Ampro ADLINK Technology, Inc.
Address: 5215 Hellyer Avenue, #110, San Jose, CA 95138, USA
Tel:
+1-408-360-0200
Toll Free: +1-800-966-5200 (USA only)
Fax:
+1-408-360-0222
Email:
info@adlinktech.com
ADLINK Technology (China) Co., Ltd.
Address: Ϟ⍋Ꮦ⌺ϰᮄऎᓴ∳催⾥ᡔುऎ㢇᯹䏃 300 ো(201203)
300 Fang Chun Rd., Zhangjiang Hi-Tech Park,
Pudong New Area, Shanghai, 201203 China
Tel:
+86-21-5132-8988
Fax:
+86-21-5132-3588
Email:
market@adlinktech.com
ADLINK Technology Beijing
Address: ࣫ҀᏖ⍋⎔ऎϞഄϰ䏃 1 োⲜ߯ࡼ࡯໻ॺ E ᑻ 801 ᅸ(100085)
Rm. 801, Power Creative E, No. 1,
Shang Di East Rd., Beijing, 100085 China
Tel:
+86-10-5885-8666
Fax:
+86-10-5885-8626
Email:
market@adlinktech.com
ADLINK Technology Shenzhen
Address: ⏅ഇᏖफቅऎ⾥ᡔುफऎ催ᮄफϗ䘧᭄ᄫᡔᴃು
A1 ᷟ 2 ὐ C ऎ (518057)
2F, C Block, Bldg. A1, Cyber-Tech Zone, Gao Xin Ave. Sec. 7,
High-Tech Industrial Park S., Shenzhen, 518054 China
Tel:
+86-755-2643-4858
Fax:
+86-755-2664-6353
Email:
market@adlinktech.com
LiPPERT ADLINK Technology GmbH
Address: Hans-Thoma-Strasse 11, D-68163, Mannheim, Germany
Tel:
+49-621-43214-0
Fax:
+49-621 43214-30
Email:
emea@adlinktech.com
Getting Service
45
ADLINK Technology, Inc. (French Liaison Office)
Address: 15 rue Emile Baudot, 91300 Massy CEDEX, France
Tel:
+33 (0) 1 60 12 35 66
Fax:
+33 (0) 1 60 12 35 66
Email:
france@adlinktech.com
ADLINK Technology Japan Corporation
Address: ͱ101-0045 ᵅҀ䛑गҷ⬄ऎ⼲⬄䤯‫ ⬎ފ‬3-7-4
⼲⬄ 374 ɛɳ 4F
KANDA374 Bldg. 4F, 3-7-4 Kanda Kajicho,
Chiyoda-ku, Tokyo 101-0045, Japan
Tel:
+81-3-4455-3722
Fax:
+81-3-5209-6013
Email:
japan@adlinktech.com
ADLINK Technology, Inc. (Korean Liaison Office)
Address: 昢殾柢 昢爎割 昢爎壟 1675-12 微汾瘶捒娯 8 猻
8F Mointer B/D,1675-12, Seocho-Dong, Seocho-Gu,
Seoul 137-070, Korea
Tel:
+82-2-2057-0565
Fax:
+82-2-2057-0563
Email:
korea@adlinktech.com
ADLINK Technology Singapore Pte. Ltd.
Address: 84 Genting Lane #07-02A, Cityneon Design Centre,
Singapore 349584
Tel:
+65-6844-2261
Fax:
+65-6844-2263
Email:
singapore@adlinktech.com
ADLINK Technology Singapore Pte. Ltd. (Indian Liaison Office)
Address: 1st Floor, #50-56 (Between 16th/17th Cross) Margosa Plaza,
Margosa Main Road, Malleswaram, Bangalore-560055, India
Tel:
+91-80-65605817, +91-80-42246107
Fax:
+91-80-23464606
Email:
india@adlinktech.com
ADLINK Technology, Inc. (Israeli Liaison Office)
Address: 6 Hasadna St., Kfar Saba 44424, Israel
Tel:
+972-9-7446541
Fax:
+972-9-7446542
Email:
israel@adlinktech.com
46
Getting Service
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