Measurement Computing USB-1208HS User manual

USB-1208HS
High-Speed Analog Input and Digital I/O
Document Revision 4
July 2014
© Copyright 2014
User's Guide

2
HM USB-1208HS.docx
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3
Table of Contents
Preface
About this Manual.................................................................................................................................5
Conventions........................................................................................................................................................5
Where to find more information.........................................................................................................................5
Chapter 1
Introducing the USB-1208HS...............................................................................................................6
Functional block diagram...................................................................................................................................6
Chapter 2
Installing the USB-1208HS...................................................................................................................7
What comes with your shipment?.......................................................................................................................7
Hardware .......................................................................................................................................................................... 7
Software............................................................................................................................................................................ 7
Documentation.................................................................................................................................................................. 7
Unpacking...........................................................................................................................................................7
Installing the software ........................................................................................................................................7
Installing the hardware .......................................................................................................................................7
Calibrating the USB-1208HS.............................................................................................................................8
Chapter 3
Functional Details .................................................................................................................................9
Analog input acquisition modes .........................................................................................................................9
Software paced mode........................................................................................................................................................ 9
Hardware paced mode....................................................................................................................................................... 9
External components ..........................................................................................................................................9
Screw terminals................................................................................................................................................................10
USB connector.................................................................................................................................................................11
Activity LED ...................................................................................................................................................................11
Status LED.......................................................................................................................................................................11
Signal connections............................................................................................................................................11
Analog input....................................................................................................................................................................11
External clock I/O............................................................................................................................................................12
Digital I/O........................................................................................................................................................................12
Counter input...................................................................................................................................................................14
Timer output....................................................................................................................................................................14
Trigger input....................................................................................................................................................................14
Power output....................................................................................................................................................................15
Ground.............................................................................................................................................................................15
Chapter 4
Specifications......................................................................................................................................16
Analog input.....................................................................................................................................................16
Digital input/output...........................................................................................................................................17
External trigger.................................................................................................................................................18
External clock input/output...............................................................................................................................18
Counters............................................................................................................................................................19
Timer ................................................................................................................................................................19
Memory ............................................................................................................................................................19
Power................................................................................................................................................................20
USB specifications ...........................................................................................................................................20
Environmental ..................................................................................................................................................20
Mechanical .......................................................................................................................................................21

USB-1208HS User's Guide
4
Screw terminal connector and pinout ...............................................................................................................21
Declaration of Conformity..................................................................................................................23

5
Preface
About this Manual
This document describes the USB-1208HS data acquisition device and lists device specifications.
Conventions
For more information
Text presented in a box signifies additional information related to the subject matter.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Additional information about USB-1208HS hardware is available on our website at www.mccdaq.com. You can
also contact Measurement Computing Corporation by phone, fax, or email with specific questions.
Knowledgebase: kb.mccdaq.com
Phone: [phone] and follow the instructions for reaching Tech Support
Fax: [phone] to the attention of Tech Support
Email: [e-mail]

6
Chapter 1
Introducing the USB-1208HS
The USB-1208HS is a high-speed analog input and digital I/O data acquisition device providing the following
features:
Eight 13-bit single-ended (SE) or four differential (DIFF) analog inputs
One external clock input and one external output for analog inputs
One digital trigger input
16 individually configurable digital I/O channels
Two 32-bit counter inputs
One 32-bit timer output
Screw terminals for field wiring connections
The device is powered by the +5 volt USB supply from your computer, and requires no external power.
The USB-1208HS is a USB 2.0 high-speed device supported under popular Microsoft®Windows®operating
systems. The USB-1208HS is compatible with both USB 1.1 and USB 2.0 ports (although the speed of the
module maybe limited when using USB 1.1 ports).
Functional block diagram
USB-1208HS functions are illustrated in Figure 1.
Figure 1. USB-1208HS functional block diagram

7
Chapter 2
Installing the USB-1208HS
What comes with your shipment?
The following items are shipped with the USB-1208HS:
Hardware
USB-1208HS
USB cable
Software
MCC DAQ CD
Documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide. This booklet provides
an overview of the MCC DAQ software you received with the device, and includes information about installing
the software. Please read this booklet completely before installing any software or hardware.
Unpacking
As with any electronic device, take care while handling to avoid damage from static electricity. Before
removing the USB-1208HS from its packaging, ground yourself using a wrist strap or touch either the computer
chassis or other grounded object to eliminate any stored static charge. If the device is damaged, notify
Measurement Computing Corporation immediately by phone, fax, or email.
Knowledgebase: kb.mccdaq.com
Phone: [phone] and follow the instructions for reaching Tech Support
Fax: [phone] to the attention of Tech Support
Email: [e-mail]
For international customers, contact your local distributor. Refer to the International Distributors section on our
web site at www.mccdaq.com/International.
Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD. This booklet is
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 the device, run Windows Update to update your operating system with the latest USB drivers.
Install the MCC DAQ software before you install your board
The driver needed to run your board is installed with the MCC DAQ software. Therefore, you need to install the
software before you install your board. Refer to the Quick Start Guide for instructions.
To connect the USB-1208HS 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 connected to your computer. The USB cable provides power and
communication to the USB-1208HS.
When you connect the USB-1208HS for the first time, a Found New Hardware dialog opens when the
operating system detects the device. The Status LED turns on; this indicates that communication is established
between the device and the computer. Refer to Figure 2 on page 9 for the location of the Status LED. When the
dialog closes, the installation is complete.

USB-1208HS User's Guide Installing the USB-1208HS
8
Caution! Do not disconnect any device from the USB bus while the computer is communicating with the
USB-1208HS, or you may lose data and/or your ability to communicate with the USB-1208HS.
If the Status LED turns off
The Status LED turns off if communication is lost between the device and the computer. To restore
communication, disconnect the USB cable from the computer and reconnect it. The Status LED should turn on.
Calibrating the USB-1208HS
The USB-1208HS is shipped fully calibrated. Calibration coefficients are stored in EEPROM.
Return the device to Measurement Computing Corporation when calibration is required. The normal calibration
interval is once per year.

9
Chapter 3
Functional Details
Analog input acquisition modes
The USB-1208HS can acquire analog input data in two basic modes – software paced and hardware paced.
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 throughput sample rate in software paced mode is system-dependent, and can range from 33 S/s to
4000 S/s.
Hardware paced mode
You can acquire data from up to eight channels in hardware-paced mode. The analog data is continuously
acquired, converted to digital values, and written to an onboard FIFO buffer on the USB-1208HS until you stop
the scan. The FIFO buffer is serviced in blocks as the data is transferred from the USB-1208HS FIFO buffer to
the memory buffer on your computer.
The maximum sample rate is 1 MS/s aggregate over 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-1208HS has the following external components, as shown in Figure 2.
Screw terminals
LED indicators
USB connector
1 Screw terminal pins 1 to 28 4 Activity LED
2 Screw terminal pins 29 to 56 5 USB connector
3 Status LED
Figure 2. External components

USB-1208HS User's Guide Functional Details
10
Screw terminals
The differential mode pinout is shown in Figure 3.
Figure 3. Differential mode pinout
The single-ended mode pinout is shown in Figure 4.
Figure 4. Single-ended mode pinout
Use 16 AWG to 30 AWG for signal connections.

USB-1208HS User's Guide Functional Details
11
USB connector
The USB connector provides +5 V power and communication. No external power supply is required.
Activity LED
The Activity LED indicates the communication status of the USB-1208HS. It blinks when data is transferred,
and is off when the device is not communicating. This LED uses up to 10 mA of current and cannot be disabled.
Status LED
The Status LED turns on when the device is detected and installed on the computer.
Signal connections
Analog input
You can connect up to eight analog input connections to the screw terminals labeled AIN0 through AIN7.
Analog signals are referenced to analog ground (AGND).
Single-ended mode requires two wires:
The wire carrying the signal to be measured connects to AINx.
The second wire connects to AGND.
Differential mode requires two wires plus a ground reference:
The wire carrying the positive portion of the differential signal to be measured connects to AINx.
The wire carrying the negative portion of the differential signal to be measured connects to AIN(x+1).
The analog ground reference wire connects to AGND.
The terminal configurations for single-ended and differential modes are shown in the table below.
Channel # 8 single-ended channels configuration 4 differential channels configuration
Vin+ Vin– Vin+ Vin–
0 AIN0 AGND AIN0 AIN1
1 AIN1 AGND AIN2 AIN3
2 AIN2 AGND AIN4 AIN5
3 AIN3 AGND AIN6 AIN7
4 AIN4 AGND - -
5 AIN5 AGND - -
6 AIN6 AGND - -
7 AIN7 AGND - -
In single-ended mode, the input voltage ranges are ±10 V, ±5 V, ±2.5 V, 0 to 10 V. In differential mode, the
input voltage ranges are ±20 V, ±10 V, and ±5 V. The voltage level on each AINx input is limited to ±14 V

USB-1208HS User's Guide Functional Details
12
Figure 5 depicts a voltage source connected to a USB-1208HS configured for SE mode.
Figure 5. Single-ended measurement connection
Figure 6 depicts a Wheatstone bridge signal source connected to a USB-1208HS configured for DIFF mode.
Figure 6. Differential measurement connection
For more information on analog signal connections
For more information on single-ended inputs, refer to the Guide to DAQ Signal Connections (this document is
available on our web site at www.mccdaq.com/signals/signals.pdf).
External clock I/O
The USB-1208HS provides one external clock input (AICKI) and one external clock output (AICKO) for analog
inputs.
You can connect an external clock signal to AICKI and/or AOCKI.
When using an external clock, AICKOoutputs the pulse generated from AICKI.
When using the internal clock, AICKO outputs the ADC scan clock.
Digital I/O
You can connect up to 16 digital I/O lines to screw terminals DIO0 through DIO15.
The 16 DIO terminals have 47 kΩresistors that you can configure for pull-up/pull-down using a jumper inside
the case. The default configuration is pull-down.
You can use the USB-1208HS digital I/O terminals to detect the state of any TTL-level input. Refer to the
schematic shown in Figure 7. If you set the switch to the +5 V input, DIO0 reads TRUE (1). If you move the
switch to GND, DIO0 reads FALSE (0).

USB-1208HS User's Guide Functional Details
13
Figure 7. Schematic showing switch detection by digital channel DIO0
Pull-up/down configuration
Each of the 16 DIO bits on the USB-1208HS has a 47 kΩ pull-up/pull-down resistor. To configure these bits for
either a +5 V pull-up or a 0 V pull-down option, open the device case to access the jumper labeled W34. The
pull-up/pull-down voltage is common to all of the internal 47 kΩ resistors.
Complete the following steps to set the W34 jumper:
1. Turn over the USB-1208HS and rest it on its top on a flat, stable surface.
2. Peel off the four rubber feet on the bottom of the module to access the screws.
3. Remove the four screws shown in Figure 8 from the bottom of the device.
Figure 8. Location of screws connecting bottom and top sections of case
4. Holding both the top and bottom sections of the module, turn it back over, rest it on the surface, and
carefully remove the top section of the case.
5. Set the jumper to either pull-up or pull-down (see Figure 9 and Figure 10).
Figure 9. Location of W34 jumper (default pull-down setting shown)

USB-1208HS User's Guide Functional Details
14
Figure 10. Pull-down and pull-up configurations
6. Replace the top section of the case, and then fasten it to the bottom section with the four screws.
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).
Counter input
CTR0 and CTR1 provide connections to each 32-bit counter input channel. Each counter can count frequencies
of up to 20 MHz.
Timer output
Use the TMR terminal to connect to the pulse width modulation (PWM) timer output. You can set the following
timer output parameters through software:
pulse frequency
duty cycle (pulse width divided by the pulse period)
number of pulses to generate
time delay before starting the timer output after it's enabled
resting state of the output (idle high or idle low)
The timer can generate a pulse output with a programmable frequency range of 0.00931 Hz up to 20 MHz. Both
the period and time delay ranges are 50 ns to 107.4 seconds.
Figure 11. PWM timer output channel
Trigger input
The TRIG connection is an external digital trigger input. The trigger mode is software selectable for:
Level-sensitive or edge-sensitive
Rising or falling edge
High or low level
The default setting at power up is edge sensitive, rising edge.

USB-1208HS User's Guide Functional Details
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Retrigger
The acquisition uses the trigger settings for positive edge/negative edge and level-sensitive/edge-sensitive, but
automatically re-arms the trigger after it is activated
Power output
You can use the two +5V connections to supply power to external devices or circuitry. These terminals can
output up to 285 mA. Refer to Figure 3 and Figure 4 on page 10 for the location of this pin.
Caution! The +5V terminals are outputs. Do not connect to an external power supply or you may damage
the USB-1208HS and possibly the computer.
Ground
The analog ground (AGND) connections provide a common ground for all analog I/O channels. The ground
(GND) connections provide a common ground for the digital I/O, timer/counter I/O, timer, clock I/O, and the
+5 V terminals.

16
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Parameter Condition Specification
A/D converter Analog Devices AD7329
13-bit successive approximation type
Input ranges Software-selectable
per channel
Differential: ±20 V, ±10 V, ±5 V (The voltage level on
each individual AIN input is limited to ±14 V.)
SE: ±10 V, ±5 V, ±2.5 V, 0 V to 10 V
Number of channels 4 differential, 8 single-ended
Software-selectable
Input configuration Multiplexed
Channel gain queue 8 unique consecutive elements Software-selectable range for each channel
Absolute maximum input
voltage
CHx IN to GND
±25 V max (power on)
±12 V max (power off)
Input impedance 35 MΩ min
Input bandwidth (–3 dB) All input ranges 2 MHz typ
Input leakage current ±250 nA typ
Input capacitance 32 pf typ
Offset error drift 5 ppm/°C typ
Gain error drift 25 ppm/°C typ
Maximum working voltage
(signal + common mode) ±20 V ±14 V
±10 V ±11 V
±5 V ±5.5 V
Sample rate 1 S/s to 1 MS/s, software programmable
Sample clock source Internal A/D clock or AICKI
Burst mode Software-selectable, burst rate = 1µs
Throughput Software paced 33 S/s to 4000 S/s typ, system dependent
Scan to PC memory 1 MS/s max
Resolution 13 bits
A/D no missing codes
(uncalibrated)
Differential mode
13 bits
Single-ended mode 12 bits
CMRR 60hz 74 dB typ
Crosstalk SE mode, all ranges, 250 kHz
input signal –62 dB typ
Differential mode, all ranges,
250 kHz input signal –78 dB typ

USB-1208HS User's Guide Specifications
17
Table 2. Calibrated absolute accuracy
Range Accuracy (mV)
±20 V (DIFF mode) ±9.55 typ, ±13.18 max
±10 V (DIFF mode) ±4.59 typ, ±6.23 max
±5 V (DIFF mode) ±2.25 typ, ±2.75 max
±10 V (SE mode) ±5.10 typ, ±8.06 max
±5 V (SE mode) ±2.63 typ, ±4.03 max
±2.5 V (SE mode) ±1.59 typ, ±2.70 max
0 – 10 V (SE mode) ±3.29 typ, ±5.13 max
Table 3 summarizes the noise performance for the USB-1208HS. Noise distribution is determined by gathering
50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum specified sample
rate of 1 MS/s.
Table 3. Noise performance
Range Typical counts LSBrms
±20 V (DIFF mode) 3 0.45
±10 V (DIFF mode) 3 0.45
±5 V (DIFF mode) 3 0.45
±10 V (SE mode) 5 0.91
±5 V (SE mode) 5 0.91
±2.5 V (SE mode) 5 0.91
0 – 10 V (SE mode) 5 0.91
Table 4. Input settling time in µs, typical
Condition Range ±1 LSB ±4 LSB ±8 LSB
+ full-scale to –full-scale
channel switch, same range
to same range
±10 V 1.5 1.1 1.0
±5 V 2.1 1.1 1.0
±2.5 V 2.2 1.1 1.0
0 V to 10 V 2.6 1.1 1.0
Digital input/output
Table 5. Digital I/O specifications
Parameter Specification
Digital type CMOS
Number of I/O 16
Configuration Each bit may be configured as input (power on default) or output
Pull-up configuration The port has 47 kΩ resistors configurable as pull-up or pull-down with an internal
jumper. The default setting is pull-down.
Digital I/O transfer rate
(system-paced) 33 to 8000 port reads/writes or single bit reads/writes per second typ, system dependent.
Input high voltage 2.0 V min
5.5 V absolute max
Input low voltage 0.8 V max
–0.5 V absolute min
0 V recommended min
Output high voltage 4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current ±24 mA max per terminal (refer to Power section for additional information)

USB-1208HS User's Guide Specifications
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External trigger
Table 6. External trigger specifications
Parameter Specification
Trigger source TRIG input
Trigger mode Software-selectable for edge or level sensitive, rising or falling edge, high or low level.
Power on default is edge sensitive, rising edge.
Trigger latency 1 µs + 1 clock cycle max
Trigger pulse width 100 ns min
Input type Schmitt trigger, 33 Ω series resistor and 47 kΩ pull-down to ground
Schmitt trigger hysteresis 0.4 V to 1.2 V
Input high voltage 2.2 V min
5.5 V absolute max
Input low voltage 1.5 V max
–0.5 V absolute min
0 V recommended min
External clock input/output
Table 7. External clock I/O specifications
Parameter Specification
Terminal names AICKI, AICKO
Terminal types AICKI: Input, active on rising edge
AICKO: Output, power on default is 0 V, active on rising edge
Terminal descriptions AICKI: Receives sampling clock from external source
AICKO: Outputs the internal sampling clock (A/D clock) or pulse generated from AICKI
when in external clock mode
Input clock rate 1 MHz max
Clock pulse width AICKI: 400 ns min
AICKO: 400 ns min
Input type Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground
Schmitt trigger hysteresis 0.4 V to 1.2 V
Input high voltage 2.2 V min
5.5 V absolute max
Input low voltage 1.5 V max
–0.5 V absolute min
0 V recommended min
Output high voltage 4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current ±24 mA max per terminal (refer to Power section for additional information)

USB-1208HS User's Guide Specifications
19
Counters
Table 8. Counter specifications
Parameter Specification
Counter terminal names CTR0, CTR1
Counter type Event counter
Number of channels 2
Input type Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground
Schmitt trigger hysteresis 0.4 V to 1.2 V
Input high voltage 2.2 V min
5.5 V absolute max
Input low voltage 1.5 V max
–0.5 V absolute min
0 V recommended min
Resolution 32 bits
Maximum input frequency 20 MHz
Counter read/write rates
(software paced) 33 to 8000 reads/writes per second typ, system dependent
High pulse width 25 ns min
Low pulse width 25 ns min
Timer
Table 9. Timer specifications
Parameter Specification
Timer terminal name TMR
Timer type PWM output with count, period, delay, and pulse width registers
Output value Default state is idle low with pulses high, software-selectable output invert
Internal clock frequency 40 MHz
Register widths 32 bits
High pulse width 20 ns min
Low pulse width 20 ns min
Output high voltage 4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current ±24 mA max per pin (refer to Power section for additional information)
Memory
Table 10. Memory specifications
Parameter Specification
Data FIFO 4 kS analog input
Non-volatile memory 32 KB (16 KB firmware storage, 16 KB calibration/user data)

USB-1208HS User's Guide Specifications
20
Power
Table 11. Power specifications
Parameter Condition Specification
Operating modes Bus-powered, USB 5 V supply
Supply current
(see Note 1) Suspend mode <2.5 mA
Enumeration <100 mA
Run mode <500 mA
Power consumption
excluding digital outputs Run mode 1.05 W max (210 mA input current)
Power available for +5 V,
AICKO, TMR, and
digital I/O
Run mode 1.45 W max
The total power consumption for all external loads must be less than this
value, and each load must meet the individual specification for the
terminal.
Digital output power
calculation Power per output = Iout × 5 V (for example, @ 24 mA, P = 0.024 × 5 = 120 mW / output)
+5 V output power
calculation Power (W) = Iout × 5 V
+5 V output voltage
range (see Note 2) Run mode 4.25 V min, 5.25 V max
Suspend mode,
enumeration 0 V
+5 V output current Run mode, no
other output loads 290 mA max (1.45 W)
Fuses On USB supply 0452.750 - Littelfuse 0.750A NANO2® Slo-Blo® Subminiature Surface
Mount Fuse.
Spare fuse mounted in holder on PCB.
Note 1: This is the total current consumption for USB-1208HS, including +5 V and digital output currents.
Note 2: Output voltage range assumes input power is within specified limits.
USB specifications
Table 12. USB specifications
Parameter Specification
USB device type USB 2.0 (high-speed)
USB device compatibility USB 1.1, 2.0
USB cable length 5 m (16.40 ft) max
USB cable type A-B cable, UL type AWM 2725 or equivalent (min 24 AWG VBUS/GND,
min 28 AWG D+/D–).
Environmental
Table 13. Environmental specifications
Parameter Specification
Operating temperature
range 0 °C to 50 °C
Storage temperature
range –40 °C to 85 °C
Humidity 0% to 90% non-condensing