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3
Trademark and Copyright Information
TracerDAQ, Universal Library, Measurement Computing Corporation, and the Measurement Computing logo are either
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Measurement Computing Corporation products are not designed with the components required, and are not subject
to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people.
4
Table of Contents
Preface
About this User's Guide ....................................................................................................................... 7
What you will learn from this user's guide ......................................................................................................... 7
Conventions in this user's guide ......................................................................................................................... 7
Where to find more information ......................................................................................................................... 7
Chapter 1
Introducing the USB-1608HS-2AO ...................................................................................................... 8
Software features ................................................................................................................................................ 9
Chapter 2
Installing the USB-1608HS-2AO ........................................................................................................ 10
What comes with your USB-1608HS-2AO shipment? ..................................................................................... 10
Unpacking the USB-1608HS-2AO ................................................................................................................... 11
Installing the software ...................................................................................................................................... 11
Installing the hardware ..................................................................................................................................... 11
Connecting the AC power adapter ...................................................................................................................................11
Connecting the USB-1608HS-2AO to your system .........................................................................................................11
Calibrating the USB-1608HS-2AO .................................................................................................................. 12
USB active LED (ACT) ...................................................................................................................................................14
Power LED (PWR) ..........................................................................................................................................................14
Main connector and pin out .............................................................................................................................................14
USB connector .................................................................................................................................................................14
Power connector ..............................................................................................................................................................15
Analog input terminals (CH0_L - CH7_H) ......................................................................................................................15
Analog voltage output terminals (VDAC0_F, VDAC0_S, VDAC1_F, and VDAC1_S) .................................................17
Analog ground terminals ..................................................................................................................................................18
Digital input terminals (DI0 to DI7) and digital output terminals (DO0 to DO7) ............................................................18
Power terminal (+5V EXT) .............................................................................................................................................19
Common ground terminals (GND) ..................................................................................................................................23
Analog input ..................................................................................................................................................... 24
Analog output ................................................................................................................................................... 26
Analog input calibration ................................................................................................................................... 27
Digital input/output........................................................................................................................................... 27
Power ................................................................................................................................................................ 29
External power input ........................................................................................................................................ 29
USB specifications ........................................................................................................................................... 29
Main connector and pin out .............................................................................................................................. 30
Declaration of Conformity .................................................................................................................. 32
6
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide explains how to install, configure, and use the USB-1608HS-2AO so that you get the most out
of its USB data acquisition features.
This user's guide also refers you to related documents available on our web site, and to technical support
resources.
Conventions in this user's guide
For more information on …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
< : > Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.
bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:
1. Insert the disk or CD and click the OK button.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example:
The InstaCal installation procedure is explained in the Quick Start Guide.
Never touch the exposed pins or circuit connections on the board.
Where to find more information
The following electronic documents provide helpful information relevant to the operation of the USB-1608HS2AO.
MCC's Specifications: USB-1608HS-2AO (the PDF version of the Specifications chapter in this guide) is
available on our web site at www.mccdaq.com/pdfs/USB-1608HS-2AO.pdf.
MCC's Quick Start Guide is available on our web site at
MCC's Guide to Signal Connections is available on our web site at
www.mccdaq.com/signals/signals.pdf.
MCC's Universal Library User's Guide is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf.
MCC's Universal Library Function Reference is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-functions.pdf.
MCC's Universal Library for LabVIEW™ User’s Guide is available on our web site at
www.mccdaq.com/PDFmanuals/SM-UL-LabVIEW.pdf.
USB-1608HS-2AO User's Guide (this document) is also available on our web site at
www.mccdaq.com/PDFmanuals/USB-1608HS-2AO.pdf.
7
Chapter 1
Introducing the USB-1608HS-2AO
This user's guide contains all of the information you need to connect the USB-1608HS-2AO to your computer
and to the signals you want to measure.
The USB-1608HS-2AO is a USB 2.0 high-speed device supported under popular Microsoft® Windows®
operating systems. The USB-1608HS-2AO is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-1608HS-2AO features the following:
With one A/D converter per channel, the USB-1608HS-2AO offers true simultaneous-sampling of up to
eight channels of 16-bit single-ended or differential analog input at 250 kHz per channel.
Each channel can be independently-configured with software for either single-ended or differential input.
The input range of each channel can also be configured independently with software.
Two independent 16-bit analog output channels can be configured with a remote sensing option to
compensate for voltage drop errors that may occur at the field device.
Eight digital input lines and eight digital output lines.
The digital output lines are driven low on power up and reset. Each digital line has an associated LED
indicator that lights for the logic 1 (high) state. You can disable all input or output LEDs with a jumper–one
jumper disables all input LEDs. A second jumper disables all output LEDs.
A 32-bit counter capable of counting TTL pulses.
A 5 V, 2 A, AC adapter (MCC p/n PS-5V2AEPS) powers the USB-1608HS-2AO. This adapter ships with
the device.
A synchronization input line (SYNC_IN) allows you to provide an external sampling clock for the analog
inputs. A synchronization output line (SYNC_OUT) lets you output the internal or external sampling clock
of the USB-1608HS-2AO analog inputs.
An analog trigger lets you start analog input conversions based on the value of a digital or analog signal.
The USB-1608HS-2AO is shown in Figure 1. I/O connections are made to the screw terminals on the device.
Figure 1. USB-1608HS-2AO
8
USB-1608HS-2AO User's Guide Introducing the USB-1608HS-2AO
Screw terminal I/O connector
USB
Microcontroller
SPI
Digital
input
32-bit
event counter
1 channel
SYNC_IN
USB
High-speed
USB 2.0
compliant
interface
32k x 16
SRAM
1 8 16
16
16
DAC 1
DAC 0
2
Ch1 force
Ch1 sense
Ch0 force
Ch0 sense
Digital
output
8
CH0_L
CH0_H
CH1_L
CH1_H
CH2_L
CH2_L
CH3_L
CH3_H
CH4_L
CH4_H
CH5_L
CH5_H
CH6_L
CH6_L
CH7_L
CH7_H
G= 1, 2, 5, 10
TRIG_IN
SYNC_OUT
USB-1608HS-2AO block diagram
USB-1608HS-2AO functions are illustrated in the block diagram shown here.
Software features
For information on the features of InstaCal and the other software included with your USB-1608HS-2AO, refer
to the Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at
Check www.mccdaq.com/download.htm for the latest software version.
Figure 2. USB-1608HS-2AO functional block diagram
9
Installing the USB-1608HS-2AO
What comes with your USB-1608HS-2AO shipment?
As you unpack your USB-1608HS-2AO, verify that the following components are included.
Hardware
USB-1608HS-2AO
Chapter 2
USB cable (2 meter length)
External power supply and cord – 10 watt AC power adapter. (MCC part number PS-5V2AEPS).
10
USB-1608HS-2AO User's Guide Installing the USB-1608HS-2AO
Additional documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide (available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf). This booklet supplies a brief description of
the software you received with your USB-1608HS-2AO and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.
Unpacking the USB-1608HS-2AO
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the USB-1608HS-2AO from its packaging, ground yourself using a wrist strap or
by simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If your USB-1608HS-2AO is damaged, notify Measurement Computing Corporation immediately by phone,
fax, or e-mail:
Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
Installing the software
Refer to the Quick Start Guide for instructions on installingthe software on the Measurement Computing Data
Acquisition Software CD.
This booklet is also available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.
Installing the hardware
Be sure you are using the latest system software
Before you install your USB-1608HS-2AO, run Windows Update to update your operating system with the
latest USB drivers.
Connecting the AC power adapter
Power to the USB-1608HS-2AO is provided with the 5 V adapter (PS-5V2AEPS). To connect the power supply
to your USB-1608HS-2AO, connect the power adapter cord to the power connector on the USB-1608HS-2AO
device, and plug the AC adapter into a power outlet.
The power LED on the device lights up when the USB-1608HS-2AO is receiving power from the AC power
adapter.
Connecting the USB-1608HS-2AO to your system
To connect the USB-1608HS-2AO to your system, turn your computer on, and connect the USB cable to a USB
port on your computer or to an external USB hub that is connected to your computer. The USB cable provides
communication to the USB-1608HS-2AO.
When you connect the USB-1608HS-2AO for the first time, a Found New Hardware dialog opens when the
USB-1608HS-2AO interface is detected.
When the dialog closes, the installation is complete. The activity LED on the USB-1608HS-2AO should flash
and then remain lit, indicating the USB-1608HS-2AO is communicating with your computer.
11
USB-1608HS-2AO User's Guide Installing the USB-1608HS-2AO
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
USB-1608HS-2AO, or you may lose data and/or your ability to communicate with the USB1608HS-2AO.
If the ACT LED turns off
If the ACT (active) LED lights up but then turns off, the computer has lost communication with the USB1608HS-2AO. To restore communication, disconnect the USB cable from the computer, and then reconnect it.
This should restore communication, and the LED should light up again.
Calibrating the USB-1608HS-2AO
The USB-1608HS-2AO is shipped fully-calibrated. Calibration coefficients are stored in EEPROM.
You can calibrate the analog inputs on the USB-1608HS-2AO with InstaCal. The normal calibration interval is
once per year.
Calibration is recommended whenever the USB-1608HS-2AO's ambient temperature changes by more than
±10 °C.
Allow the USB-1608HS-2AO to warm up for at least 30 minutes before starting the calibration.
12
Screw terminal pins 1 to 54
USB active LED
Power LED
Chapter 3
Functional Details
Theory of operation - analog input acquisition modes
The USB-1608HS-2AO can acquire analog input data in two basic modes – software paced and continuous
scan.
Software paced mode
You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion by
calling a software command. The analog value is converted to digital data and returned to the computer. You
can repeat this procedure until you have the total number of samples that you want.
The maximum throughput sample rate in software paced mode is system-dependent.
Continuous scan mode
You can acquire data from up to eight channels simultaneously in continuous scan mode. The analog data is
continuously acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1608HS2AO until you stop the scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB1608HS-2AO FIFO buffer to the memory buffer on your computer.
The maximum sampling rate is 250 kS/s per channel for one-to-eight channels. You can start a continuous scan
with either a software command or with an external hardware trigger event.
External components
The USB-1608HS-2AO has the following external components, as shown in Figure 3.
USB connector
USB activity (ACT) LED
Power connector
Power (PWR) LED
Screw terminals
Figure 3. USB-1608HS-2AO external components – front view
13
USB-1608HS-2AO User's Guide Functional Details
LED Illumination
Indication
Steady green
The USB-1608HS-2AO is connected to a computer or external USB hub.
Blinks continuously
Data is being transferred.
Connector type
Screw terminal
Wire gauge range
16 AWG to 30 AWG
1 GND
2 DI0
3 DI1
4 DI2
5 DI3
6 DI4
7 DI5
8 DI6
9 DI7
10 GND
11 DO0
12 DO1
13 DO2
14 DO3
15 D04
16 DO5
17 DO6
18 DO7
19 GND
20 SYNC_IN
21 SYNC_OUT
22 +5V EXT
23 CTR
24 TRIG_IN
25 VDAC0_F
26 VDAC0_S
27 AGND
28 VDAC1_F
29 VDAC0_S
30 AGND
31 CH0_L
32 CH0_H
33 AGND
34 CH1_L
35 CH1_H
36 AGND
37 CH2_L
38 CH2_H
39 AGND
40 CH3_L
41 CH3_H
42 AGND
43 CH4_L
44 CH4_H
45 AGND
46 CH5_L
47 CH5_H
48 AGND
49 CH6_L50 CH6_H
51 AGND
52 CH7_L
53 CH7_H
54 AGND
USB active LED (ACT)
The ACT LED indicates the communication status of the USB-1608HS-2AO. The table below defines the
function of the ACT LED.
LED Illumination
Power LED (PWR)
The PWR LED lights up when the USB-1608HS-2AO is receiving +5 V of power from the AC power adapter.
Main connector and pin out
The USB-1608HS-2AO has one row of screw terminals that provide the following connections:.
16 analog input connections (CH0_L to CH7_L and CH0_H to CH7_H) covering eight analog input
channels.
10 analog ground connections (AGND)
Eight digital input connections (DI0 to DI7)
Eight digital output connections (DO0 to D07)
Four analog output connections (VDAC0_F, VDAC0_S, VDAC1_F, VDAC1_S) covering two DAC
channels—only two connections (VDAC0_F and VDAC1_F) needed if remote sensing is disabled
One external trigger source (TRIG_IN)
Two SYNC terminals for external clocking and multi-unit synchronization (SYNC_IN and SYNC_OUT)
One external event counter connection (CTR)
One voltage connection (+5 V EXT)
Three digital ground connections (GND)
Signals are identified in Figure 4.
Figure 4. USB-1608HS-2AO screw terminal functions
USB connector
The USB connector is on the rear of the USB-1608HS-2AO. This connector provides communication..
14
USB-1608HS-2AO User's Guide Functional Details
USB connector
Power connector
Power connector
Connect the external power adapter (MCC part number PS-5V2AEPS) to the power connector on the rear of the
USB-1608HS-2AO.
You can connect up to eight analog input connections to these screw terminal pins:
CH0_H and CH0_L
CH1_H and CH1_L
CH2_H and CH2_L
CH3_H and CH3_L
CH4_L and CH4_H
CH5_L and CH5_H
CH6_L and CH6_H
CH7_L and CH7_H
Refer to the Figure 4 on page 14 for the location of these pins.
Input configuration
Analog signals are referenced to analog ground (AGND). Single-ended mode requires two wires:
The wire carrying the signal to be measured connects to CHx_H.
The second wire connects to AGND.
Differential mode requires three wires:
The wire carrying the positive portion of the differential signal to be measured connects to CHx_H.
The wire carrying the negative portion of the differential signal to be measured connects to CHx_L.
The analog ground reference wire connects to AGND.
The input voltage ranges are ±10 V, ±5 V, ±2.0 V, ±1.0 V. The following image illustrates a typical
single-ended measurement connection.
15
USB-1608HS-2AO User's Guide Functional Details
CH7_H
AGD
The following image depicts a voltage source connected to a USB-1608HS-2AO configured for single-ended
mode.
Figure 6. Single-ended measurement connection
16
USB-1608HS-2AO User's Guide Functional Details
CH7_H
CH7_L
CH7_H
AGD
+5 V
CH7_L
The following image depicts a Wheatstone bridge signal source connected to a USB-1608HS-2AO configured
for differential mode.
Figure 7. Differential measurement connection
For more information on analog signal connections
For more information on single-ended inputs, refer to the Guide to Signal Connections (this document is
available on our web site at www.mccdaq.com/signals/signals.pdf).
Analog voltage output terminals (VDAC0_F, VDAC0_S, VDAC1_F, and
VDAC1_S)
You can connect up to two analog voltage outputs to screw terminal pins VDAC0_F and VDAC1_F.
You may also use the VDAC0_S and VDAC1_S when you enable the remote sensing option for the output
channel. Refer to the pinout diagram on page 14 for the location of these pins.
You can enable remote sensing for each analog output on the USB-1608HS-2AO with InstaCal.
The remote sensing feature compensates for the voltage drop error that occurs in applications where the USB1608HS-2AO's analog outputs are connected to its load through a long wire- or cable-type interconnect.
17
USB-1608HS-2AO User's Guide Functional Details
(75 max)
R
Series
VDAC_F
(nForce)
VDAC_S
(nSense)
R
(1000 max)
Load
Wire- and cable-type interconnects have some amount of associated series resistance. To calculate the total
series resistance, multiply the overall length by the manufacturer's specified resistance per unit length (Ω). If the
series resistance becomes large enough, a voltage drop error occurs along the wire when supplying current to
the load resistance. The remote sensing feature compensates for the voltage drop error that occurs along the
wire.
Connecting the USB-1608HS-2AO when using the remote sensing feature
To connect the USB-1608HS-2AO for remote sensing, connect two separate output wires—one from the
VDACn_F (force) output terminal, and one from the VDACn_S (sense) input terminal—to the high side or
positive input terminal of the field device (load). The "n" in the terminal name refers to the number of the
analog output terminal (0 or 1).
For best results, these two wires should have identical length and gauge. The use of a twisted pair is highly
recommended.
In this configuration, the sense wire detects the voltage at the end of the force wire, and compensates for the I*R
loss along the wire due to the wire resistance.
R
should not exceed the specified 1000 Ω, and the R
load
should not exceed its specified limit of 75 Ω.
series
V
compliance
= ((R
load
+ R
) * AOUT)/R
series
load
Connecting the USB-1608HS-2AO when not using the remote sensing feature
If you are not using the remote sensing feature, connect a single output wire or cable from the VDACn_F
(force) output terminal(s) to the load, and leave the VDACn_S (sense) terminals unconnected.
The voltage output range for each channel is ±10 V. The current output is a maximum of ±10 mA per channel.
Analog ground terminals
The 10 analog ground (AGND) connections provide a common ground for all analog input channels, output
channels, and the analog trigger (TRIG_IN).
Refer to the pinout diagram on page 14 for the location of the AGND terminal pins.
Digital input terminals (DI0 to DI7) and digital output terminals (DO0 to DO7)
You can connect up to eight digital input lines to screw terminals DI0 through DI7.
You can connect up to eight digital output lines to screw terminals DO0 to DO7.
Refer to the pinout diagram on page 14 for the location of these pins.
18
USB-1608HS-2AO User's Guide Functional Details
+5V EXT
GND
DI0
GND
DI0
+5V EXT
The eight input pins have 47 k resistors that you can configure to either pull-up or pull-down, or disconnected
with a jumper.
You can use the USB-1608HS-2AO digital I/O terminals to detect the state of any TTL-level input. Refer to the
switch circuit shown in Figure 8 and the schematic shown in Figure 9. If you set the switch to the +5V EXT
input, DI0 reads TRUE (1). If you move the switch to GND, DI0 reads FALSE (0).
Figure 8. Digital connection DI0 detecting the state of a switch
Figure 9. Schematic showing switch detection by digital channel DI0
Each digital input and digital output pin has an associated LED status indicator. A high at the pin lights the
LED.
You can disable the LEDs with jumpers. There is a jumper for the input LEDs, and a jumper for the output
LEDs.
For more information on digital signal connections
For general information regarding digital signal connections and digital I/O techniques, refer to the Guide to
Signal Connections (available on our web site at www.mccdaq.com/signals/signals.pdf).
Power terminal (+5V EXT)
You can use the +5V EXT connection to supply power to external devices or circuitry. This terminal can output
up to 10 mA.
Refer to the pinout diagram on page 14 for the location of this pin.
Caution! The +5V EXT terminal is an output. Do not connect to an external power supply or you may
damage the USB-1608HS-2AO and possibly the computer.
Counter terminal (CTR)
The CTR terminal is a TTL-level input to a 32-bit event counter. Refer to the pinout diagram on page 14 for the
location of this pin. The internal counter increments when the TTL level transitions from low to high. The
counter can count frequencies of up to 1 MHz.
19
USB-1608HS-2AO User's Guide Functional Details
SYNC_IN pin
SYNC_OUT pin
SYNC terminals (SYNC_IN and SYNC_OUT)
You can use the SYNC_IN connection to externally pace the A/D conversions. The SYNC_IN terminal
supports TTL-level input signals of up to 250 kHz.
Use the SYNC_OUT connection to output the clock used for A/D conversions.
One example of the use of these two pins would be to synchronize with a second USB-1608HS-2AO and
acquire synchronized data from 16 channels. You can connect the SYNC_OUT pin of one USB-1608HS-2AO
to the SYNC_IN pin of another USB-1608HS-2AO to acquire data synchronously from 16 channels.
Figure 10. Configuring for synchronous data acquisition
Trigger terminal (TRIG_IN)
The TRIG_IN connection is an external analog/digital trigger input.
With the analog trigger function, you can start and control acquisitions with an analog signal. The analog trigger
threshold is from -10 V to +10 V on the TRIG_IN pin. A 12-bit DAC sets the level for the threshold. The
threshold resolution in this mode is 4.88 mV.
The USB-1608HS-2AO has three trigger options that you must set.
Trigger above or trigger below
Level-sensitive or edge-sensitive
Retrigger on or retrigger off
Each trigger operation mode is explained next. In each case, a ±2 V triangle waveform is used as the TRIG_IN
input source. The high threshold is set to 1.0 V, and the low threshold signal is set to -1.0 V.
In the following analog trigger signal diagrams, the bold portion of the waveform indicates the data acquired for
the given analog trigger mode.
20
USB-1608HS-2AO User's Guide Functional Details
High threshold
Trigger can occur
anywhere in this area
Acquired data
+2
-2
0
-1
+2
-2
0
-1
Low threshold
Acquired Data
+2
-2
0
-1
+2
-2
0
-1
Trigger can occur
anywhere in this area
Trigger above, level-sensitive
The acquisition begins when the TRIG_IN signal is above the threshold level. If the TRIG_IN signal is above
the threshold at the start of the scan, the acquisition begins immediately
Figure 11. Trigger above, level-sensitive
Trigger below, level-sensitive
The acquisition begins when TRIG_IN receives a signal that is below the low threshold (-1.0 V). If the
TRIG_IN signal is below the threshold level at the start of the scan, the acquisition begins immediately
Figure 12. Trigger below, level-sensitive
21
USB-1608HS-2AO User's Guide Functional Details
Acquired data
High threshold
Trigger occurs here
+2
-20-1
Low threshold
Acquired data
+2
-20-1
+2
-2
0
-1
Trigger occurs here
+2
-2
0
-1
Trigger above, edge-sensitive
The acquisition begins the first time the TRIG_IN signal goes above the high threshold (1.0 V). The TRIG_IN
signal must transition from below to above the high threshold to begin the acquisition.
Figure 13. Trigger above, edge-sensitive
Trigger below, edge-sensitive
The acquisition begins when TRIG_IN signal first goes below the low threshold (-1.0 V). A transition from
above to below the threshold is necessary to begin acquisition. The TRIG_IN signal must transition from above
to below the low threshold to begin the acquisition.
Figure 14. Trigger below, edge-sensitive
22
USB-1608HS-2AO User's Guide Functional Details
Retrigger
The acquisition uses the trigger settings for positive edge/negative edge and level-sensitive/edge-sensitive, but
automatically rearms the trigger after acquiring the specified number of samples.
Common ground terminals (GND)
Three ground (GND) connections provide a common ground for the DIx, DOx, CTR, SYNC_IN and
SYNC_OUT, and +5V EXT connections.
Refer to the pinout diagram on page 14 for the location of the GND terminals.
23
Parameter
Conditions
Specification
A/D converter type
16-bit successive approximation type
Number of channels
Eight differential
Eight single-ended
Input configuration
Individual A/D per channel
Sampling method
Simultaneous
Analog input modes
Power up and reset state
CHx_H and CHx_L inputs are disconnected from their
screw terminal pins and internally connected to GND
(recommended configuration for unused inputs).
Single-ended
CHx_H inputs are connected directly to their screw
terminal pins.
CHx_L inputs are disconnected from their screw
terminal pins and internally connected to GND.
Differential
CHx_H and CHx_L inputs are connected directly to
their screw terminal pins.
Absolute maximum input
voltage
CHx IN to GND.
TRIG_IN to GND
±25 V maximum (power on)
±15 V maximum (power off)
Input impedance
CHx IN
1 GΩ (power on)
1.5 kΩ (power off)
Input bandwidth (-3 dB)
All input ranges
330 kHz
Input leakage current
±25 pA
Input capacitance
50 pf
Input ranges
Software-selectable per channel
±10 V, ±5 V, ±2 V, ±1 V
A/D pacing
Onboard A/D clock, external source (SYNC_IN). See
Table 9 on page 28.
A/D trigger source
TRIG_IN input. See Table 8 on page 27.
A/D trigger modes
External analog. See Table 8 on page 27.
Maximum working voltage
(signal + common mode)
±0.05% FSR maximum.
Sampling rate
0.009 S/s to 250 kS/s, software-programmable
Throughput
Software-paced
33 to 8000 S/s all channels, system-dependent
Scan to PC memory
250 kS/s per channel maximum (throughput rate may be
limited on USB 1.1 ports).
Resolution
16 bits
Differential non-linearity
(Note 1)
Calibrated
±2.0
Un-calibrated
± 0.5 LSB typical.
±1.0 LSB maximum.
CMRR (60 Hz)
±10 V range
81 db minimum
±5 V range
81 db minimum
±2 V range
92 db minimum
±1 V range
92 db minimum
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Chapter 4
24
USB-1608HS-2AO User's Guide Specifications
Range
Accuracy (mV)
±10 V
± 7.019
±5 V
± 3.509
±2 V
± 1.403
±1 V
± 0.702
Range
Integral Non Linearity
(% FSR)
Gain error at FS
(mV)
Offset (mV)
Gain tempco
(ppm/°C)
Offset tempco
(µV/°C)
±10 V
0.00915
4.578
1.526
3.8
19.5
±5 V
0.00915
2.289
0.763
7.0
19.5
±2 V
0.00915
0.916
0.305
16.5
24.3
±1 V
0.00915
0.458
0.153
40.1
29.2
Range
Peak to Peak Noise
(counts)
RMS noise
LSBrms
±10 V
8
1.21
±5 V
8
1.21
±2 V
8
1.21
±1 V
8
1.21
Note 1: The maximum differential non-linearity specification applies to the entire 0-55 °C temperature
range of the USB-1608HS-2AO. This specification also accounts for the maximum errors due to
the software calibration (in Calibrated mode only) and the AD7685 analog to digital converter
non-linearities.
Table 2. Calibrated absolute accuracy
Table 3. Accuracy components - All values are (±)
Note 2: When connecting differential inputs to floating input sources, the user must provide a DC return
path from each differential input to ground. This can be accomplished by simply connecting a
resistor from each of the differential inputs to AGND. A value of approximately 100 kΩ can be
used for most applications.
Table 4. Noise performance – all values are (±)
Table 4 summarizes the noise performance for the USB-1608HS-2AO. Noise distribution is determined by
gathering 50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum
specified sampling rate of 250 kS/s.
25
USB-1608HS-2AO User's Guide Specifications
Parameter
Conditions
Specifications
Number of channels
Two independent
Resolution
16 bits
Output range
±10 V
Throughput
Single channel
70 kS/s
Two channel
35 kS/s
Pacer source
Onboard D/A clock
Monotonicity
16 bits
Glitch energy
200 nV/s
Current output (Note 3)
±10 mA maximum single channel
±20 mA maximum two channels
Output short-circuit protection
Output connect to GND
100 mS maximum
Output coupling
DC
Power up and reset state
DACs clear to midscale, (0 V, ±20 mV).
Remote sense is disabled.
Remote sense configuration
Enabled or disabled through software
control.
Remote sense compliance voltage
(Note 4)
±10.75 V maximum
Remote sense compensation range
(Note 5)
0 to 75 Ω maximum
Output noise
100 nV/Hz
Settling time (to 0.003%)
20 V output step, (RL=5 kΩ,
CL=200 pf)
5 µS maximum
Slew rate
10 V/µs
Absolute accuracy
±0.25% of FSR maximum
Offset error drift
±4 ppm/°C
Gain error drift
±10 ppm/°C
Analog output
Table 5. Analog output specifications
Note 3: The maximum load that the analog output can drive is calculated by dividing the full-scale output
voltage by the current output specification or (10 V/10 mA) = 1000 Ω. This calculation is valid
whether the Remote Sense feature is enabled or disabled.
Note 4: The USB-1608HS-2AO Remote Sense feature can compensate for any series resistance up to
75 Ω between its force terminal pins and its output load.
Note 5: R
should not exceed the specified 1000 Ω, and the R
load
should not exceed its specified limit
series
of 75 Ω.
26
USB-1608HS-2AO User's Guide Specifications
Parameter
Specifications
Recommended warm-up time
15 minutes minimum
Calibration method
Software calibration
Calibration interval
1 year
Calibration reference
+10.000 V, ±5 mV maximum. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C maximum
Long term stability: 30 ppm/1000 h
Digital type
5 V CMOS
Number of I/O
16
Configuration
Eight input, eight output
Pull-up/pull-down configuration
The eight input pins have 47 k resistors that may be configured to either pull-up
or pull-down with a jumper
Digital I/O transfer rate (system-paced)
System-dependent, 33 to 8000 port reads/writes or single bit reads/writes per
second.
Input high voltage
2.0 V minimum, 5.5 V absolute maximum
Input low voltage
0.8 V maximum, –0.5 V absolute minimum
Output high voltage (IOH = –2.5 mA)
3.8 V minimum
Output low voltage (IOL = 2.5 mA)
0.7 V maximum
Power on and reset state
Outputs: driven low
LED indicators
Each I/O pin has an associated LED status indicator. A high at the pin will
cause the LED to be on. The LEDs may be disabled with jumpers - one jumper
for the input LEDs (JP1), and one jumper for the output LEDs (JP2).
Parameter
Conditions
Specification
Trigger source
TRIG_IN input
Trigger input range
±10 V maximum.
Absolute maximum input voltage
TRIG_IN to GND
±25 V maximum (power on)
±15 V maximum (power off)
Trigger threshold levels
±10V/4096; Software configurable
Input impedance
1 MΩ (power on)
1.5 kΩ (power off)
Trigger modes
Software configurable for:
Positive or negative slope
Edge/level
Retrigger
Threshold resolution
12 bits, 1 in 4096
Threshold accuracy
±0.25% FSR
Hysteresis
±5 mV
Full power bandwidth (-3 dB)
640 kHz
Analog input calibration
Table 6. Analog input calibration specifications
Digital input/output
Table 7. Digital I/O specifications
External trigger
Table 8. External trigger specifications
27
USB-1608HS-2AO User's Guide Specifications
Parameter
Conditions
Specification
Pin names
SYNC_IN, SYNC_OUT
Pin type
SYNC_IN: Input
SYNC_OUT: Output
Pin descriptions
SYNC_OUT
Outputs A/D pacer clock.
SYNC_IN
Receives A/D pacer clock from external source.
Rising edge sensitive.
Input clock rate
250 kHz maximum.
Clock pulse width
SYNC_IN
1 µs minimum
SYNC_OUT
2 µs minimum
Input leakage current
±2.0 µA
Input high voltage
3.5 V minimum, 6.5 V absolute maximum
Input low voltage
1.5 V maximum, –0.5 V absolute minimum
Output high voltage (Note 6)
IOH = –2.5 mA
3.3 V minimum
No load
3.8 V minimum
Output low voltage (Note 6)
IOL = 2.5 mA
1.1 V maximum
No load
0.6 V maximum
Pin name (Note 7)
CTR
Counter type
Event counter
Number of channels
1
Input type
TTL, rising edge triggered
Input source
CTR screw terminal
Resolution
32 bits
Schmidt trigger hysteresis
0.58 V to 0.93 V
Input leakage current
±5 µA
Maximum input frequency
1 MHz
High pulse width
500 ns minimum
Low pulse width
500 ns minimum
Input high voltage
2.4 V minimum, 6.5 V absolute maximum
Input low voltage
2.19 V maximum, –0.5 V absolute minimum
Data FIFO
65536 samples, 131,072 bytes
EEPROM
512 bytes
External clock input/output
Table 9. External clock I/O specifications
Note 6: SYNC_OUT is over-current protected with a 200 Ω series resistor.
Counter
Note 7: CTR is a Schmitt trigger input protected with a 1 kΩ series resistor.
Memory
Table 10. Counter specifications
Table 11. Memory specifications
28
USB-1608HS-2AO User's Guide Specifications
Type
High performance 8-bit RISC microcontroller
Program memory
16,384 words
Data memory
2,048 bytes
Parameter
Conditions
Specification
Supply current (see Note 8)
Continuous mode
920 mA
+5V EXT output voltage range (see Note 9)
4.5 V minimum, 5.25 V maximum
+5V EXT output current (see Note 10)
+10 mA maximum
External power input
+5.0 VDC (+5 V power supply included)
External power adapter
+5 V, ±5% @ 2 A
USB device type
USB 2.0 (high-speed)
USB device compatibility
USB 1.1, 2.0
USB cable length
Three meters maximum.
USB cable type
A-B cable, UL type AWM 2527 or equivalent (minimum 24 AWG
VBUS/GND, minimum 28 AWG D+/D-).
Operating temperature range
0 to 55 °C maximum
Storage temperature range
-40 to 85 °C maximum
Humidity
0 to 90% non-condensing
Microcontroller
Table 12. Microcontroller specifications
Power
Table 13. Power specifications
Note 8: This is the total current requirement for the USB-1608HS-2AO. This specification does not
include any additional contribution due to +5VEXT output current, analog output source current,
or DIO loading.
Note 9: Output voltage range assumes input power supply is within specified limits.
Note 10: This refers to the total amount of current that can be sourced from the +5VEXT terminal pin for
general use.
External power input
USB specifications
Environmental
Table 14. External power input specifications
Table 15. USB specifications
Table 16. Environmental specifications
29
USB-1608HS-2AO User's Guide Specifications
Card dimensions
203.2 mm (L) x 121.9 mm (W) x 20.0 mm (H)
8.0" (L) x 4.8" (W) x 0.8" (H)
Enclosure dimensions
241.3 mm (L) x 125.7 mm (W) x 58.9 mm (H)
9.50" (L) x 4.95" (W)x 2.32" (H)
Connector type
Screw terminal
Wire gauge range
16 AWG to 30 AWG
Pin
Signal name
Pin
Signal name
1
GND
28
VDAC1_F
2
DI0
29
VDAC1_S
3
DI1
30
AGND
4
DI2
31
CH0_L
5
DI3
32
CH0_H
6
DI4
33
AGND
7
DI5
34
CH1_L
8
DI6
35
CH1_H
9
DI7
36
AGND
10
GND
37
CH2_L
11
DO0
38
CH2_H
12
DO1
39
AGND
13
DO2
40
CH3_L
14
DO3
41
CH3_H
15
DO4
42
AGND
16
DO5
43
CH4_L
17
DO6
44
CH4_H
18
DO7
45
AGND
19
GND
46
CH5_L
20
SYNC_IN
47
CH5_H
21
SYNC_OUT
48
AGND
22
+5V EXT
49
CH6_L
23
CTR
50
CH6_H
24
TRIG_IN
51
AGND
25
VDAC0_F
52
CH7_L
26
VDAC0_S
53
CH7_H
27
AGND
54
AGND
Mechanical
Table 17. Mechanical specifications
Main connector and pin out
Table 18. Main connector specifications
Table 19. Main connector pin out, 8-channel differential mode
30
USB-1608HS-2AO User's Guide Specifications
Pin
Signal name
Pin
Signal name
1
GND
28
VDAC1_F
2
DI0
29
VDAC1_S
3
DI1
30
AGND
4
DI2
31
NC
5
DI3
32
CH0_H
6
DI4
33
AGND
7
DI5
34
NC
8
DI6
35
CH1_H
9
DI7
36
AGND
10
GND
37
NC
11
DO0
38
CH2_H
12
DO1
39
AGND
13
DO2
40
NC
14
DO3
41
CH3_H
15
DO4
42
AGND
16
DO5
43
NC
17
DO6
44
CH4_H
18
DO7
45
AGND
19
GND
46
NC
20
SYNC_IN
47
CH5_H
21
SYNC_OUT
48
AGND
22
+5V EXT
49
NC
23
CTR
50
CH6_H
24
TRIG_IN
51
AGND
25
VDAC0_F
52
NC
26
VDAC0_S
53
CH7_H
27
AGND
54
AGND
Table 20. Main connector pin out, 8-channel single-ended mode
31
Declaration of Conformity
Manufacturer: Measurement Computing Corporation
Address: 10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Category:Electrical equipment for measurement, control and laboratory use.
Measurement Computing Corporation declares under sole responsibility that the product
USB-1608HS-2AO
EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN 61326 (1997) Amendment 1 (1998)
Emissions: Group 1, Class A
EN 55011 (1990)/CISPR 11: Radiated and Conducted emissions.
Immunity: EN61326, Annex A
IEC 61000-4-2 (1995): Electrostatic Discharge immunity, Criteria A.
IEC 61000-4-3 (1995): Radiated Electromagnetic Field immunity Criteria A.
IEC 61000-4-4 (1995): Electric Fast Transient Burst immunity Criteria A.
IEC 61000-4-5 (1995): Surge immunity Criteria A.
IEC 61000-4-6 (1996): Radio Frequency Common Mode immunity Criteria A.
IEC 61000-4-8 (1994): Power Frequency Magnetic Field immunity Criteria A.
IEC 61000-4-11 (1994): Voltage Dip and Interrupt immunity Criteria A.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
June, 2007. Test records are outlined in Chomerics Test Report # EMI4813.07.
We hereby declare that the equipment specified conforms to the above Directives and Standards.
Carl Haapaoja, Director of Quality Assurance
Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766
(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com
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