Scan Thermocouples and dc Volts up to 147 Channels/s
Single-Channel Burst Mode for
Digitizing Waveforms up to 20 kHz
Scanning Modules Available for
24 Channels of Thermocouple/Voltage
or High Voltage
744 Channel Max Expansion
Built-In IEEE-488 and RS-232/422
32 TTL Digital Alarm Outputs and 8 TTL Digital Inputs
Two Programmable Scan Rates for:
Pre-Trigger and Post-Trigger Sampling and Accelerated Sampling On-Event Detection
256 Kbytes Memory, Expandable to 4 Mbytes and Real-Time Clock
Includes ChartView Datalogging and
PostView Graphic Data Review
Programs for Windows
The OMB-MULTISCAN-1200 is no longer available please see the OMB-DAQSCAN-2000 as a possible alternative or
contact our data aquisition department.
The OMB-MULTISCAN-1200 is a compact, 19-inch rackmountable temperature and
voltage measurement interface that features channel-to-channel isolation. It has
the versatility to scan thermocouples and volts at up to 147 channels/s, and
digitize waveforms up to 20 kHz.
The standard unit accepts 24 differential inputs for any
combination of voltage and temperature measurements. It
has a 16-bit A/D converter, oversampling, and averaging for
low noise and AC line rejection.
Unlike most temperature measuring instruments and PC
plug-in boards, which are difficult or expensive to expand
beyond their built-in channel capacity, the
OMB-MULTISCAN-1200 can be easily expanded
up to 744 channels via low-cost slave expansion units.
The OMB-MULTISCAN-1200 includes easy-to-program
IEEE-488 and RS-232/422 interfaces. Two Windows
applications, ChartView, a set up, acquisition, and display
program; and PostView, a post-acquisition display program,
are provided with each unit.
The OMB-MULTISCAN-1200 can accept either the
OMB-MTC-24 thermocouple/voltage or OMB-MHV-24
high voltage input module. Each module features 24
input channels. Using available expansion chassis, up
to 30 additional input modules can be accommodated,
yielding 744 total input channels.
The OMB-MTC-24 thermocouple/volts module accepts
J, K, T, E, R, S, B, and N thermocouple types, or ±10 V,
±5 V, ±1 V, and ±100 mV inputs. Channel-to-channel
isolation is 200 Vdc peak.
The OMB-MHV-24 high-voltage module accepts ±250 V,
±25 V, ±2.5 V. Channel-to-channel isolation is 500 Vdc peak.
Input Module Measurement Capability
The OMB-MULTISCAN-1200 master unit can control up
to 15 OMB-EXP-10A slave expansion units. Each
OMB-EXP-10A accepts either one or two 24-channel input
modules, providing a maximum of 744 input channels.
The OMB-MULTISCAN-1200 provides an array of
scanning capabilities to meet user application requirements.
Because data logging applications frequently require
the logging of readings at fixed time intervals, the
OMB-MULTISCAN-1200 uses the standard hoursminutes-
seconds (hh:mm:ss.s) format to specify the time
interval between channel scans. Users can configure
the unit to begin and end data logging on a specified
event-such as a TTL signal, temperature level, IEEE
GET, alarm condition, or absolute time of day-or upon
completion of a specified number of readings.
The OMB-MULTISCAN-1200 has a number of features and
capabilities that enable it to deliver the high accuracy
demanded by many research applications.
The unit’s high-speed 16-bit A/D converter enables it to offer
up to 0.1°C and 3.12 µV resolution with the OMB-MTC-24
The OMB-MULTISCAN-1200 filters ac line cycle noise by
sampling and averaging 32 measurements per line cycle,
or, for more demanding applications, by averaging across
multiples of 1, 2, 4, or 8 line cycles.
High-Accuracy Cold-Junction Compensation
The OMB-MTC-24 thermocouple scanning module features
three strategically located temperature sensors that provide
high accuracy cold-junction compensation across all 24
The OMB-MULTISCAN-1200 enables quick and accurate
linearization by providing built-in lookup tables for popular
thermocouple types, including J, K, T, E, R, S, B, and N.
The unit can also store user-defined lookup tables in nonvolatile
RAM (NVRAM) for use with user-defined
thermocouple linearization curves.
Many process-control applications require only periodic
monitoring during normal conditions, with accelerated
measurement and control until the process returns to a
steady state. The OMB-MULTISCAN-1200 provides
32 digital alarm outputs that can be activated on a perchannel
basis via user-specified alarm conditions, and it
automatically returns its alarm outputs to steady state once
limit conditions are resolved.
The OMB-MULTISCAN-1200 can also update alarmed
output channels in real-time, at its programmed scan rate,
and can alert the host computer of active alarm conditions
via an IEEE-488 service request (SRQ). The ability to
automatically update alarm outputs in real-time affords
greater control of applications and reduces programming
burden by eliminating the need for constant, per-channel
monitoring by the controlling computer.
The OMB-MULTISCAN-1200 features a real-time clock to
synchronize acquisition to a specific time of day. During
acquisition, the OMB-MULTISCAN-1200 stores the time
and date of each data scan in memory, enabling later
retrieval of this information for use in plotting and analyzing
measurements over time. The unit also time and date
stamps each channel’s high and low excursions, providing a
precise time record of a channel’s minimum and maximum
The OMB-MULTISCAN-1200 has 256 Kbytes of data
storage, which can be upgraded to 1 or 4 Mbytes with
standard SIMMS (single in-line memory modules). Because
individual measurements are not necessary for all data
logging applications, the unit makes each channel’s high,
low, and last readings available throughout acquisition.
The OMB-CHARTSCAN-1400 includes
ChartView, Windows-based setup and
acquisition application. ChartView
provides a graphical spreadsheet style
user interface that lets you easily
configure your hardware, acquisition,
and display parameters. ChartView
features a no programming approach
that enables data collection and
display within minutes.
ChartView provides a number of data
display options including a real-time
smooth scrolling trend display, digital
meters, analog meters, and bar graph
meters. The collected data is stored to
disk in an ASCII format so it may be
easily imported into other applications,
such as Microsoft Excel, for post
acquisition display and analysis. In
addition, ChartView also provides a
real-time link to Excel using Dynamic
Data Exchange (DDE). The OMBCHARTSCAN-
1400 also includes
PostView, a post acquisition graphics
display program that integrates
seamlessly into ChartView. Using
PostView’s intuitive on-screen controls,
you can expand, contract and
auto-scale waveforms as well as scroll
in either direction. PostView also provides
hardcopy printout of the waveform.
The table to the right
summarizes the differences between
ChartView and ChartView Plus.
ChartView and ChartView Plus Feature Overview
Channels per Chart
up to 4
Chart Setup Wizard
Individual Channel Positioning
Separate Pre- & Post-Scan Number
Separate Pre- & Post-Scan Rate
mX+b Scaling with Reference Channel
Digital/Analog Bar Graph Meters
Links to Excel
Scale Data to User Units
Uniform and Scaled Grids
† All amounts shown in USD Note: Each OMB-MULTISCAN-1200 unit supplied with ChartView software, digital I/O mating connector, rack mount kit and complete operator’s manual. Each OMB-EXP-10A supplied with rack mount kit and master/slave cable.
OMB-TEMPSCAN - OMB-TEMPSCAN and OMB-MULTISCAN operator's manual
OMB-TEMPSCAN - OMB-TEMPSCAN and OMB-MULTISCAN Quick-Start Guide