System Description
The CR7 features a modular, multiple-processor design that provides precision measurement and control capability in a
rugged, battery-operated system.
700X Control Module
Control Module functions include task initiation, processing, data
storage, and telecommunications. The control module contains the
CPU with 24K bytes of system PROM and 40K bytes of RAM, the
serial interface for peripheral communication and connection of up to
four I/O modules, the keyboard/display, and the optional memory
expansion card. The system’s 2.5 Amp-hour sealed-rechargeable
batteries and AC-charging circuitry are also in this module.
709 512K Memory Card: Provides RAM storage for an additional
262,126 data values. Maximum of one per 700X Control Module.
720 & 720XL I/O Module
The I/O module performs all measurement and control functions; it
consists of a processor card, a precision analog interface card, and
seven card slots. Model 720 has seven I/O card slots; model 720XL
has 14 slots (ENC 7XL required). The processor card provides regu-
lated power for analog and digital functions from the unregulated
12-volt supply. The analog interface card contains a 16-bit A/D
converter and a precision voltage reference. All I/O module
connections are transient protected with spark gaps.
723 Analog Input Card: Contains 14 differential or 28 single-
ended inputs. Differential measurements reverse the input
polarities for a second conversion to reduce thermal emfs. Input
ground terminals connect to a heavy copper bar, which reduces
single-ended measurement offsets to less than five microvolts.
723T Analog Input Card With RTD: Identical to the 723 Card
except a platinum resistance thermometer (PRT) is centered below
the terminal strip to provide a reference junction temperature for
the thermocouple measurements. The PRT’s measurement is accu-
rate to ±0.1°C over a -40° to +60°C range.
724 Pulse Counter Card: Provides four pulse counting channels
for switch closures, low-level AC, or high-frequency pulse signals.
725 Excitation Card: Provides eight switched analog excitations
for resistance measurements, two continuous analog outputs, and
eight digital control outputs. All continuous analog outputs and
digital control ports can be active simultaneously; only one
switched excitation output can be active at a time.
726 50 Volt Analog Input Card: Provides 8 differential or 16
single-ended inputs for full-scale ranges of ±50 and ±15 VDC.
Accuracy is ±0.2% FSR; common mode range is ±50 VDC;
maximum sustained input voltage without damage is ≤ ±160 VDC.
Enclosures
ENC 7F Environmentally Sealed Enclosure (cover photo):
20” x 13” x 10” fiberglass enclosure for harsh environments.
Accommodates the 700X control module and 720 I/O module.
It has two sensor ports that fit #14 shell size circular connectors.
A gas-tight connector option is also available.
ENC 7L Aluminum Frame for Lab: 17” x 12” x 6”; provides a
housing for benchtop use. 19” rack mounts and NEMA enclosures
are also available.
ENC 7XL: 19” x 19” x 10” fiberglass enclosure for harsh environ-
ments. Accommodates 700X and 720XL modules.
(82 strony)
(2 strony)
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