Omega Products DI-720 Installation Manual

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DI-720 SERIES

Software-Configurable

Recording Instruments

DI-730 SERIES

Software-Configurable High

Voltage Recording Instruments

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W ARNING: These products are not designed for use in, and should not be used for, human applications.

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DI-720/DI-730 Series User Manual

Table of Contents

1. Introduction ........................................................................................................................................ 1

Features .............................................................................................................................................. 1

Analog Input ...................................................................................................................................... 1

Analog Output ................................................................................................................................... 2

Digital Input and Output (DI-720 Series Only) ................................................................................. 2

2. Specifications ...................................................................................................................................... 3

Signal Connections ............................................................................................................................ 3

Interface Characteristics .................................................................................................................... 3

Analog Inputs .................................................................................................................................... 3

Analog Outputs .................................................................................................................................. 4

Digital Input/Output (DI-720 Series Only) ....................................................................................... 4

Timing Input/Output .......................................................................................................................... 4

Input Scan List ................................................................................................................................... 4

Output Scan List ....................................................... ..... .................................................................... 5

On-board DSP ........................................................... ......................................................................... 5

Physical/Environmental ..................................................................................................................... 5

3. Getting Started ................................................................................................................................... 7

Unpacking .......................................................................................................................................... 7

Applying Power to the DI-7x0 Series Instrument ............................................................................. 7

Connecting the DI-7xx Series Instrument to your Computer ............................................................ 8

Parallel (Printer) Port Operation (All Instruments) ..................................................................... 8

Ethernet Operation (DI-720-EN or DI-730-EN Only) ................................................................ 9

USB Operation (DI-720-USB or DI-730-USB Only) ................................................................. 9

Controls and Indicators ................................................................................. ..... .... ............................ 10

DI-720 Series Instrument Front Panel ........................................................................................ 11

DI-730 Series Instrument Front Panel ........................................................................................ 13

Instrument Rear Panel ................................................................................................................. 14

PRINTER PORT .................................................................................................................. 14

STATUS LAMPS ................................................................................................................. 14

POWER INPUT JACK ........................................................................................................ 14

POWER SWITCH ................................................................................................................ 14

ETHERNET PORT .............................................................................................................. 15

RESET SWITCH .................................................................................................................. 15

USB PORT ........................................................................................................................... 15

4. Calibration Verification ..................................................................................................................... 17

Required Equipment .......................................................................................................................... 17

A/D Calibration (For DI-720 and DI-730 Series Instruments) ................................................... 17

D/A Calibration (DI-720 Instruments Only) ............................................................................... 17

A/D Calibration Verification (DI-720 and DI-730 Series Instruments) ............................................ 17

D/A Calibration (DI-720 Series Only) .............................................................................................. 18

Offset Calibration Verification (DI-720 Series Only) ....................................................................... 19

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DI-720/DI-730 Series User Manual

Full Scale (Span) Calibration Verification (DI-720 Series Only) ..................................................... 19

Offset Calibration Verification (DI-730 Series only) ........................................................................ 20

Full Scale (Span) Calibration Verification (DI-730 Series Only) ..................................................... 20

5. Block Diagram .................................................................................................................................... 21

Table of Contents

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DI-720/DI-730 Series User Manual

1. Introduction

Congratulations on your purchase of a DI-720 Series or DI-730 Series data acquisition instrument. These instruments
permit data acquisition on IBM personal computers and compatibles from either Windows or the DOS programming
environments.

This manual describes how to connect and use all of the instruments in the DI-720 and DI-730 Series. Throughout the
majority of this manual, enough similarity exists to describe all instruments with the same procedure. The convention
used to annotate this similarity is "DI-7x0 Series" (this means that the procedure or information applies equally to the
DI-720-P, DI-720-EN, DI-720-USB, DI-730-P, DI-730-EN, or to the DI-730-USB). In cases where the resemblance
is not equal, separate procedures/descriptions exist for each instrument.

It is assumed that you have a general understanding of data acquisition, digital I/O, and DSP operations, and that you
possess enough proficiency in software to write your own application and/or diagnostic programs.

Features

The DI-7x0 Series provides the following features:

• All instruments connect to the parallel port of any desktop, transportable, notebook, or laptop PC-compatible
computer. Most communicate through the PC's parallel port in standard, bi-directional, or EPP mode. Models DI­720-EN and DI-730-EN only communicate in bi-directional or EPP parallel port modes. Models DI-720-EN, DI­730-EN, DI-720-USB, and DI-730-USB add optional Ethernet and USB communication modes respectively.

• Per channel software-configurable settings:

Single-ended or differential input (DI-720 Series only).
Input gain.
Sample rate.
Signal Averaging.

• Flexible power requirements. All instruments operate from any st andard 60Hz, 120V AC wall outlet with the
supplied power adapter. Or, power the instruments from any +9 to +36 volt DC source, such as a car battery.

• 250kHz burst sampling rate.

• 16-bit A/D converter, for high resolution measurement accuracy.

• 256-entry input list allows you to scan any sequence of input channels at any available gain. The 256-entry input
list also allows you to average 32,768 consecutive readings per channel for low-noise output signals.

• 256 counters are assigned to the input list allowing each channel to be programmed for a different sample rate.

• Supports analog pre- and post-triggering of data acquisition based on the level and slope of a specified channel.

The following provides a brief overview of the major subsystems of the DI-7x0 Series.

Analog Input

32 single-ended/16 differential analog inputs (on DI-720 Series instruments) or 8 differential analog inputs (on DI­730 Series instruments) allow your analog signals to be converted into 16-bit digital data via the onboard A/D con­verter.

The DI-720 Series features software-programmable input measurement ranges of ±10V full scale at a gain of 1; ±5V
full scale at a gain of 2; ±2.5V full scale at a gain of 4; and ±1.25V full scale at a gain of 8. The DI-730 Series features
software programmable input measurement ranges of ±10mV, ±100mV, ±1V, ±10V, ±100V, and ±1000V full scale
(the ±1000V range is useable up to ±800 VDC or peak AC).

Introduction

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DI-720/DI-730 Series User Manual

Analog Output

On DI-720 instruments, the D/A subsystem features two, buffered, 12-bit D/A converters for outputting analog data.
DI-730 instruments have only one 12-bit D/A converter for outputting analog data.

Both instruments feature a software-programmable output range of ±10V.
Both instruments feature an onboard 16-entry output counter list that allows you to write analog or di gital output at

the maximum conversion rate of the instrument.

Digital Input and Output (DI-720 Series Only)

The DI-720 Series contains 8 each input and output lines for input/output operations. These lines provide an interface
for the transfer of data between user memory and a peripheral device connected to the instrument. Digital inputs can
monitor alarms or sensors with TTL outputs, while digital outputs can drive TTL inputs on control or measurement
equipment.

Introduction

2

DI-720/DI-730 Series User Manual

2. Specifications

Signal Connections

Signal connections are made directly to the two, 37-pin, D-type connectors on the front panel of DI-720 Series
instruments or to the 5-way binding posts (banana jacks) on the front panel of DI-730 Series instruments. On DI-720
Series instruments, signal connections can also be made with the DI-205, which is an optional, general purpose sig­nal interface that provides convenient, 5-way binding posts (banana jacks) for analog input signals and a screw-ter­minal strip for digital and analog output signals. Refer to chapter 5 Accessories in this manual for complete DI-205
details. Note that the DI-205 is an extra-cost option that is not included with the purchase of a DI-720 Series instru­ment.

Interface Characteristics

Compatible computer architecture: Any PC architecture. Connects to computer via the parallel (or printer)

port. Supports standard, bi-directional, or EPP parallel port communica­tion modes (models DI-720-EN and DI-730-EN only support bi-direc­tional and EPP parallel port communication modes). Optional
communication interfaces include Ethernet and Universal Serial Bus
(USB).

Analog Inputs

Number of input channels:

DI-720 Series: 32 single-ended, 16 differential (software selectable per channel)

DI-730 Series: 8 differential
Converter resolution: 16-bit
Common mode rejection ratio:

DI-720 Series: 80 dB minimum @ Av=1

DI-730 Series: 20 dB minimum @ DC to 60Hz
Accuracy: ±0.25% of full scale range
Crosstalk: -75 dB @ 100kHz and 100W unbalance
Sample throughput rate:

Printer port: Standard port 40,000; bi-directional port 80,000; EPP 250,000 samples/

second max (software selectable per channel)

USB: 200,000 samples/second max

Ethernet: 2,000 samples/second max

Maximum analog measurement range
(software selectable per channel)

DI-720 Series: ±10V full scale at a gain of 1

±5V full scale at a gain of 2
±2.5V full scale at a gain of 4
±1.25V full scale at a gain of 8

Specifications

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DI-720/DI-730 Series User Manual

DI-730 Series: ±10mV full scale

±100mV full scale
±1V full scale
±10V full scale
±100V full scale

±1000V full scale (±1000V range useable up to ±800VDC or peak AC)
Gain error: 1 bit max @ 1kHz sample rate
Input offset voltage: 1 bit max @ 1kHz sample rate
Input settling time: 4µs to 0.01% at all gains
Input impedance

DI-720 Series: MΩ resistor tied to GND on the input channel
DI-730 Series: 0 MΩ

Analog Outputs

Number of channels:

DI-720 Series: Two buffered analog outputs

DI-730 Series: One analog output
Resolution: 12-bit; 1 part in 4,096 @ 250kHz
Output voltage range: ±10V full scale
Output impedance: 10Ω
Sample rate: standard port 40,000; bi-directional port 80,000; EPP 250,0 00 samples/

second max (software selectable per channel)
Output offset voltage: 1 bit max @ 1kHz sample rate
Gain error: 1 part in 16,384 @ 1kHz

Digital Input/Output (DI-720 Series Only)

Capacity: 8 each input and output
Compatibility: TTL compatible
Max source current: 0.4mA @ 2.4V
Max sink current: 8mA @ 0.5V
Digital input termination: 4.7kΩ pull-up to +5VDC

Timing Input/Output

Number of input counters: 256
Number of output counters: 16
Resolution: 1 part in 32,768
Base clock accuracy: 0.01%
Counter input frequency: 16 MHz

Input Scan List

Capacity: 240 elements

Specifications

4

Output Scan List

Capacity 16 elements

On-board DSP

T y pe: Analog Devices ADSP2181, 32 MIPS
Clock frequency: 16 MHz external, 64 MHz internal
Data memory: 8k words
Program memory: 8k words

Physical/Environmental

Box dimensions: 7.29"W by 9"L by 1.52"H
I/O connector:

DI-720 Series: 37-pin male D-type

DI-730 Series: Banana jacks
Weight: 3 lbs
Operating environment:

Component temperature: 0º to 70º C

Relative humidity: 0% to 90% non condensing

Storage environment:

Temperature: 55º to 150º C

Relative humidity: 0% to 90% non condensing

DI-720/DI-730 Series User Manual

Specifications

5