Campbell Scientific CR10X Measurement and Control System - Manual (Page 35)

CR10X OVERVIEW
OV-23
OV7. SPECIFICATIONS
Electrical specifications are valid over a -25° to +50°C range unless otherwise specified; non-condensing environment
required. To maintain electrical specifications, yearly calibrations are recommended.
We recommend that you confirm system
configuration and critical specifications with
Campbell Scientific before purchase.
Copyright © 1986, 2001
Campbell Scientific, Inc.
Printed September 2001
PROGRAM EXECUTION RATE
Program is synchronized with real-time up to 64 Hz.
One measurement with data transfer is possible at
this rate without interruption. Burst measurements up
to 750 Hz are possible over short intervals.
ANALOG INPUTS
NUMBER OF CHANNELS: 6 differential or 12 single-
ended, individually configured. Channel expansion
provided by AM16/32 or AM416 Relay Multi-
plexers and AM25T Thermocouple Multiplexers.
ACCURACY: ±0.1% of FSR (-25° to 50°C);
±0.05% of FSR (0° to 40°C);
e.g., ±0.1% FSR = ±5.0 mV for ±2500
mV range
RANGE AND RESOLUTION:
Full Scale Resolution (µV)
Input Range (mV) Differential Single-Ended
±2500 333 666
±250 33.3 66.6
±25 3.33 6.66
±7.5 1.00 2.00
±2.5 0.33 0.66
INPUT SAMPLE RATES: Includes the measurement
time and conversion to engineering units. The
fast and slow measurements integrate the signal
for 0.25 and 2.72 ms, respectively. Differential
measurements incorporate two integrations with
reversed input polarities to reduce thermal offset
and common mode errors.
Fast single-ended voltage: 2.6 ms
Fast differential voltage: 4.2 ms
Slow single-ended voltage: 5.1 ms
Slow differential voltage: 9.2 ms
Differential with 60 Hz rejection: 25.9 ms
Fast differential thermocouple:
8.6 ms
INPUT NOISE VOLTAGE (for ±2.5 mV range):
Fast differential: 0.82 µV rms
Slow differential: 0.25 µV rms
Differential with 60 Hz rejection: 0.18 µV RMS
COMMON MODE RANGE: ±2.5 V
DC COMMON MODE REJECTION: >140 dB
NORMAL MODE REJECTION: 70 dB (60 Hz with
slow differential measurement)
INPUT CURRENT: ±9 nA maximum
INPUT RESISTANCE: 20 Gohms typical
ANALOG OUTPUTS
DESCRIPTION: 3 switched, active only during mea-
surement, one at a time.
RANGE: ±2.5 V
RESOLUTION: 0.67 mV
ACCURACY: ±5 mV; ±2.5 mV (0° to 40°C);
CURRENT SOURCING: 25 mA
CURRENT SINKING: 25 mA
FREQUENCY SWEEP FUNCTION: The switched
outputs provide a programmable swept frequency,
0 to 2.5 V square wave for exciting vibrating wire
transducers.
RESISTANCE MEASUREMENTS
MEASUREMENT TYPES: The CR10X provides
ratiometric bridge measurements of 4- and 6-wire
full bridge, and 2-, 3-, and 4-wire half bridges.
Precise dual polarity excitation using any of the
switched outputs eliminates dc errors.
Conductivity measurements use a dual polarity
0.75 ms excitation to minimize polarization errors.
ACCURACY: ±0.02% of FSR plus bridge resistor
error.
PERIOD AVERAGING MEASUREMENTS
DEFINITION: The average period for a single cycle is
determined by measuring the duration of a speci-
fied number of cycles. Any of the 12 single-ended
analog input channels can be used. Signal atten-
tuation and AC coupling are typically required.
INPUT FREQUENCY RANGE:
Signal peak-to-peak 1 Min. Max
Min. Max. Pulse w. Freq. 2
500 mV 5.0 V 2.5 µs 200 kHz
10 mV 2.0 V 10 µs 50 kHz
5 mV 2.0 V 62 µs 8 kHz
2 mV 2.0 V 100 µs 5 kHz
1 Signals centered around datalogger ground
2 Assuming 50% duty cycle
RESOLUTION: 35 ns divided by the number of
cycles measured
ACCURACY: ±0.03% of reading
TIME REQUIRED FOR MEASUREMENT: Signal
period times the number of cycles measured plus
1.5 cycles + 2 ms
PULSE COUNTERS
NUMBER OF PULSE COUNTER CHANNELS: 2
eight-bit or 1 sixteen-bit; software selectable as
switch closure, high frequency pulse, and low
level AC.
MAXIMUM COUNT RATE: 16 kHz, eight-bit counter;
400 kHz, sixteen-bit counter. Channels are
scanned at 8 or 64 Hz (software selectable).
SWITCH CLOSURE MODE
Minimum Switch Closed Time: 5 ms
Minimum Switch Open Time: 6 ms
Maximum Bounce Time: 1 ms open without
being counted
HIGH FREQUENCY PULSE MODE
Minimum Pulse Width: 1.2 µs
Maximum Input Frequency: 400 kHz
Voltage Thresholds: Count upon transition
from below 1.5 V to above 3.5 V at low frequen-
cies. Larger input transitions are required at high
frequencies because of input filter with 1.2 µs time
constant. Signals up to 400 kHz will be counted if
centered around +2.5 V with deviations
‡ – 2.5 V
for ‡ 1.2 µs.
Maximum Input Voltage: ±20 V
LOW LEVEL AC MODE
(Typical of magnetic pulse flow transducers or
other low voltage, sine wave outputs.)
Input Hysteresis: 14 mV
Maximum AC Input Voltage: ±20 V
Minimum AC Input Voltage:
(Sine wave mV RMS)
Range (Hz)
20 1.0 to 1000
200 0.5 to 10,000
1000 0.3 to 16,000
DIGITAL I/O PORTS
8 ports, software selectable as binary inputs or
control outputs. 3 ports can be configured to count
switch closures up to 40 Hz.
OUTPUT VOLTAGES (no load): high 5.0 V ±0.1 V;
low < 0.1 V
OUTPUT RESISTANCE: 500 ohms
INPUT STATE: high 3.0 to 5.5 V; low -0.5 to 0.8 V
INPUT RESISTANCE: 100 kohms
SDI-12 INTERFACE STANDARD
DESCRIPTION: Digital I/O Ports C1-C8 support
SDI-12 asynchronous communication; up to ten
SDI-12 sensors can be connected to each port.
Meets SDI-12 Standard version 1.2 for datalogger
and sensor modes.
CR10XTCR THERMOCOUPLE REFERENCE
POLYNOMIAL LINEARIZATION ERROR: Typically
<±0.5°C (-35° to +50°C), <±0.1°C (-24° to +45°C).
INTERCHANGEABILITY ERROR: Typically <±0.2°C
(0° to +60°C) increasing to ±0.4°C (at -35°C).
EMI and ESD PROTECTION
EMISSIONS: Meets or exceeds following standards:
Radiated: per EN 55022:1987 Class B
Conducted: per EN 55022:1987 Class B
IMMUNITY: Meets or exceeds following standards:
ESD: per IEC 801-2;1984 8 kV air discharge
RF: per IEC 801-3;1984 3 V/m, 27-500 MHz
EFT: per IEC 801-4;1988 1 kV mains, 500 V
other
CE COMPLIANCE (as of 01/98)
APPLICATION OF COUNCIL DIRECTIVE(S):
89/336/EEC as amended by 89/336/EEC and
93/68/EEC
STANDARD(S) TO WHICH CONFORMITY IS
DECLARED:
ENC55022-1: 1995 and ENC50082-1: 1992
CPU AND INTERFACE
PROCESSOR: Hitachi 6303
PROGRAM STORAGE: Up to 16 kbytes for active
program; additional 16 kbytes for alternate
programs. Operating system stored in 128 kbytes
Flash memory.
DATA STORAGE: 128 kbytes SRAM standard
(approximately 60,000 data values). Additional
2 Mbytes Flash available as an option.
OPTIONAL KEYBOARD DISPLAY: 8-digit LCD
(0.5" digits)
PERIPHERAL INTERFACE: 9 pin D-type connector
for keyboard display, storage module, modem,
printer, card storage module, and RS-232
adapter.
BAUD RATES: Selectable at 300, 1200, 9600
and 76,800 for synchronous devices. ASCII com-
munication protocol is one start bit, one stop bit,
eight data bits (no parity).
CLOCK ACCURACY: ±1 minute per month
SYSTEM POWER REQUIREMENTS
VOLTAGE: 9.6 to 16 Vdc
TYPICAL CURRENT DRAIN: 1.3 mA quiescent,
13 mA during processing, and 46 mA during
analog measurement.
BATTERIES: Any 12 V battery can be connected as
a primary power source. Several power supply
options are available from Campbell Scientific.
The Model CR2430 lithium battery for clock and
SRAM backup has a capacity of 270 mAhr.
PHYSICAL SPECIFICATIONS
SIZE: 7.8" x 3.5" x 1.5" - Measurement & Control
Module; 9" x 3.5" x 2.9" - with CR10WP Wiring
Panel. Additional clearance required for serial
cable and sensor leads.
WEIGHT: 2 lbs
WARRANTY
Three years against defects in materials and
workmanship.