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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. Multiview, a datalogging and display software and Postview, a post-acquisition display program are both provided with each unit.
SCANNING MODULES
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.
EXPANSION ARCHITECTURE
The OMB-MULTISCAN-1200 master unit can control up to 15 OMB-EXP-10A slave expansion units. Each OMB-EXP-10A
accepts either on or two 24 channel input modules, providing a maximum of 744 input channels. These units may
be used as bench-top units or may be mounted on a 19" rack with provided hardware.
SCANNING CAPABILITIES
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 hours-minutes-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.
ACCURACY
The unitÆs high-speed 16-bit A/D converter enables it to offer up to 0.1░C and 3.12 ╡V resolution with the
OMB-MTC-24 scanning module. 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. The OMB-MTC-24 thermocouple scanning module
features three strategically located temperature sensors that provide high accuracy cold-junction compensation
across all 24 inputs. 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 non-volatile RAM (NVRAM) for use with user-defined thermocouple linearization curves.
Because individual measurements are not necessary for all data logging applications, the unit makes each
channelÆs high, low, and last readings available throughout acquisition.
ALARMS
The OMB-MULTISCAN-1200 provides 32 digital alarm outputs that can be activated on a per-channel
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.
MEMORY
The OMB-MULTISCAN-1200 has 256 Kbytes of data storage, which can be upgraded to 1, 4, or 8 Mbytes
with standard SIMMS (single in-line memory modules). Because individual measurements are not necessary
for all data logging applications, the unit makes each channelÆs high, low, and last readings available
throughout acquisition.
SOFTWARE
MultiView software is provided standard with the OMB-MULTISCAN-1200. This Microsoft Windows
application allows you to graphically configure channel characteristics and scanning requirements, and also
provides several options for viewing, plotting, and saving measurement data. It permits the display of
real-time readings in spreadsheet format and supports Dynamic Data Exchange (DDE) for transferring
readings to other applications. It also enables real-time plotting of acquired readings.
Postview is also included which will allow the user to recall stored data for display, and will display up
to 16 channels simultaneously, and also allows the graphical data to be printed to any Windows supported printer.
Copy (to your hard drive) Tempview and Postview software now!
View an Adobe Acrobat pdf file for more product info (requires Acrobat Reader)
View the Multiscan Quick-Start Guide (requires Acrobat Reader).
View the Multiscan complete operator's manual - 8MB (requires Acrobat Reader).
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