Campbell Scientific CR510 Basic Datalogger - Manual (Page 30)

CR510 OVERVIEW
OV-18
OV7. SPECIFICATIONS
PROGRAM EXECUTION RATE
System tasks initiated in sync with real-time up
to 64 Hz. One measurement with data transfer is
possible at this rate without interruption.
ANALOG INPUTS
NUMBER OF CHANNELS: 2 differential or 4
single-ended, individually configured.
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 differential voltage: 4.2 ms
Slow differential voltage: 9.2 ms
Differential with 60 Hz rejection: 25.9 ms
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
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: 2 switched excitations, active only
during measurement, one at a time.
RANGE: ±2.5 V
RESOLUTION: 0.67 mV
ACCURACY: ±2.5 mV (0° to 40°C);
±5 mV (-25° to 50°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 CR510 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 errors.
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 4 single-ended
analog input channels can be used. Signal atten-
tuation and ac coupling is 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
RESOLUTION: 35 ns divided by the number of
cycles measured
ACCURACY: ±0.03% of reading
TIME REQUIRED FOR MEASUREMENT: Signal
period multiplied by the number of cycles
measured plus 1.5 cycles + 2 ms.
PULSE COUNTERS
NUMBER OF CHANNELS: 2 eight-bit or 1 sixteen-
bit; software selectable as switch closure, high
frequency pulse, or low-level ac modes. An addi-
tional channel (C2/P3) can be software configured
to read switch closures at rates up to 40 Hz.
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
Maximum Input Voltage: ±20 V
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.
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 to 1000
200 0.5 to 10,000
1000 0.3 to 16,000
*16-bit config. or 64 Hz scan req’d for freq. > 2048 Hz
DIGITAL I/O PORTS
DESCRIPTION: Port C1 is software selectable as a
binary input, control output, or as an SDI-12 port.
Port C2/P3 is input only and can be software con-
figured as an SDI-12 port, a binary input, or as a
switch closure counter (40 Hz max).
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-C2 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.
EMI and ESD PROTECTION
The CR510 is encased in metal and incorporates EMI
filtering on all inputs and outputs. Gas discharge
tubes provide robust ESD protection on all terminal
block inputs and outputs. The following European
standards apply.
EMC tested and conforms to BS EN61326:1998.
Details of performance criteria applied are available
upon request.
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 62,000 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, and 9600,
76,800 for certain synchronous devices. ASCII
communication 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: 8.4" x 1.5" x 3.9" (21.3 cm x 3.8 cm x 9.9 cm).
Additional clearance required for serial cable and
sensor leads.
WEIGHT: 15 oz. (425 g)
WARRANTY
Three years against defects in materials
and workmanship.
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 © 1999, 2001
Campbell Scientific, Inc.
Printed September 2001