Specifications

CR3000 Overview
OV6. Specifications
ANALOG INPUTS (SE1-SE28 or DIF1-DIF14)
14 differential (DF) or 28 single-ended (SE) voltage
measurements individually configured. Ratiometric
resistive bridge, thermocouple, and period average
(frequency) measurements also supported on all ana-
log input channels. Channel expansion provided by
AM16/32 and AM25T multiplexers.
RANGES, RESOLUTION: 16-bit basic resolution (Basic
Res).
Resolution of DF measurements with input
reversal is half the Basic Res (17-bits).
Input Range (mV)
1
DF Res (µV)
2
Basic Res (µV))
±5000 83.33 167
±1000 33.3 16.67
±200 3.33 6.67
±50 0.83 1.67
±20 0.33 0.67
1
Range overhead of ~9% exists on all ranges to guarantee
that the full-scale range values will not cause overrange
.
2
Resolution of DF measurements with input reversal.
ACCURACY
3
:
±(0.04% of reading + offset), 0° to 40°C
±(0.07% of reading + offset), -25° to 50°C
±(0.09% of reading + offset), -40° to 85°C (-XT only)
3
Accuracy does not include sensor and measurement noise.
Offsets are defined as:
Offset for DF w/input reversal = 1.5·Basic Res + 1.0 µV
Offset for DF w/o input reversal = 3·Basic Res + 2.0 µV
Offset for SE = 3·Basic Res + 5.0 µV
MEASUREMENT SPEED: Time includes 250 µs for
conversion to engineering units. For voltage mea-
surements, the CR3000 integrates the input signal.
Integration Integration Settling Measurement Total Time
Type Time Time Standard Input Rev.
250 250 µs 200 µs ~0.7 ms ~1.4 ms
60 Hz filter 16.67 ms 3 ms ~20 ms ~40 ms
50 Hz filter 20.00 ms 3 ms ~23 ms ~46 ms
INPUT NOISE VOLTAGE: For DF measurements with
input reversal on ±20 mV input range; digital resolution
dominates for higher ranges.
250 µs Integration: 0.4 µV RMS
50/60 Hz Integration: 0.19 µV RMS
COMMON MODE RANGE: ±5 V
DC COMMON MODE REJECTION: >100 dB
NORMAL MODE REJECTION: 70 dB @ 60 Hz when
using 60 Hz rejection
SUSTAINED INPUT VOLTAGE W/O DAMAGE:
±16 VDC max.
INPUT CURRENT: ±1 nA typical, ±6 nA max.
@ 50°C; ±120 nA @ 85°C
INPUT RESISTANCE: 20 Gohms typical
ACCURACY OF BUILT-IN REFERENCE JUNCTION
THERMISTOR (for thermocouple measurements):
±0.3°C, -25° to 50°C;
±0.8°C, -40° to 85°C (-XT only)
PERIOD AVERAGE MEASUREMENTS: Any of the
28 SE analog inputs can be used for period
averag-
ing. Accuracy is ±(0.01% of reading + resolution)
where resolution is 96 ns divided by the specified
number of cycles to be measured.
Input Amplitude & Frequency:
Volt. Range Signal (peak to peak) Pulse W. Max. Freq.
Gain Code Min (mV) Max (V)
4
Min. (µs) (kHz)
5
1 mV1000 200 10 2.5 200
5 mV200 20 2 5.0 100
20 mV50 5 2 10.0 50
50 mV20 2 2 25.0 20
4
Maximum signal must be centered at datalogger ground.
5
Assuming 50% duty cycle.
ANALOG OUTPUTS (Vx1-Vx4, Ix1-Ix3, CAO1, CAO2)
4 switched voltage and 3 switched current outputs for
ratiometric sensor/bridge excitation and 2 continuous
voltage outputs. Switched outputs active only during
measurement, one at a time.
Current Compliance
Range Res Source/Sink Voltage
Vx:
±5 V 0.17 mV ±50 mA N/A
CAO: ±5 V 0.17 mV ±15 mA N/A
Ix: ±2.5 mA 0.08 µA N/A ±5 V
Vx & CAO ACCURACY:
±(0.04% of setting + 0.5 mV), 0° to 40°C
±(0.07% of setting + 0.5 mV), -25° to 50°C
±(0.09% of setting + 0.5 mV), -40° to 85°C (-XT only)
Ix ACCURACY:
±(0.1% of setting + 0.5 µA), 0° to 40°C
±(0.13% of setting + 0.5 µA), -25° to 50°C
±(0.15% of setting + 0.5 µA), -40° to 85°C (-XT only)
Vx FREQUENCY SWEEP FUNCTION: The switched
outputs provide a programmable swept frequency,
0 to 5 V square wave for exciting vibrating wire
transducers.
RESISTANCE MEASUREMENTS
MEASUREMENT TYPES: The CR3000 provides
ratiometric measurements of 4- and 6-wire full
bridges, and 2-, 3-, and 4-wire half bridges. Precise,
dual polarity excitation for voltage or current excita-
tions eliminates DC errors. Offset values are reduced
by a factor of 2 when excitation reversal is used.
VOLTAGE RATIO ACCURACY
1
: Assuming excitation
voltage of at least 500 mV, and not including bridge
resistor errors
±(0.02% of voltage reading + offset)/V
x
, 0° to 40°C
±(0.025% of voltage reading + offset)/V
x
, -25° to 50°C
±(0.03% of voltage reading + offset)/V
x
, -40° to 85°C
1
Accuracy does not include sensor and measurement noise.
Offsets are defined as:
Offset for DF w/input reversal = 1.5·Basic Res + 1.0 µV
Offset for DF w/o input reversal = 3·Basic Res + 2.0 µV
Offset for SE = 3·Basic Res + 5.0 µV
ACCURACY WITH CURRENT EXCITATION
1
:
Assuming excitation current of at least 500 µA.
±(0.02% of voltage reading + offset)/I
x
, 0° to 40°C
±(0.025% of voltage reading + offset)/I
x
, -25° to 50°C
±(0.03% of voltage reading + offset)/I
x
, -40° to 85°C
1
Accuracy does not include sensor and measurement noise.
Offsets are defined as:
Offset for DF w/input reversal = 1.5·Basic Res + 1.0 µV
Offset for DF w/o input reversal = 3·Basic Res + 2.0 µV
Offset for SE = 3·Basic Res + 5.0 µV
DEDICATED PULSE COUNTERS (P1-P4)
Four inputs individually selectable for switch closure,
high frequency pulse, or low-level AC. Independent
24-bit counters (16.8 x 10
6
counts) for each input.
SWITCH CLOSURE MODE:
Minimum Switch Closed Time: 5 ms
Minimum Switch Open Time: 6 ms
Max. Bounce Time: 1 ms open w/o being counted
HIGH FREQUENCY PULSE MODE:
Voltage Thresholds: Count upon transition from
below 0.9 V to above 2.2 V after input filter with
1.2 µs time constant.
Maximum Input Voltage: ±20 V
Maximum Input Frequency: 250 kHz
LOW LEVEL AC MODE: Internal AC coupling
removes DC offsets up to ±0.5 V.
Input Hysteresis: 16 mV @ 1 Hz
Maximum AC Input Voltage: ±20 V
Minimum ac Input Voltage:
Sine wave (mV RMS) Range (Hz)
20 1.0 to 20
200 0.5 to 200
2000 0.3 to 10,000
5000 0.3 to 20,000
DIGITAL CONTROL PORTS (C1-C8, SDM)
8 digital control ports (C1-C8) having multiple func-
tion capability including digital control outputs, digital
control interrupts, pulse counting, switch closure,
frequency/period measurements, edge timing, and
SDI-12 communication. Independent asynchronous
communication ports (UARTs) paired on control port
pairs C1-C2, C3-C4, C5-C6, and C7-C8 resulting in
four independent Tx/Rx pair for serial sensors.
INPUT STATE: high 3.8 to 5.3 V; low -0.3 to 1.2 V
INPUT HYSTERESIS: 1.4 V
INPUT RES
ISTANCE: 100 kohms
HIGH FREQUENCY MAX: 400 kHz
SWITCH CLOSURE FREQUENCY MAX: 150 Hz
OUTPUT VOLTAGES (no load): high 5.0 V ±0.1 V;
low <0.1
OUTPUT RESISTANCE: 330 ohms
ADDITIONAL DIGITAL PORTS: SDM-C1, SDM-C2,
SDM-C3 are dedicated for measuring SDM devices.
SWITCHED 12 V (SW12V)
Two independent 12 V unregulated sources switched
on and off under program control. Thermal fuse hold
current = 900 mA @ 20°C, 650 mA @ 50°C, 360 mA
@ 85°C.
CE COMPLIANCE
STANDARD(S) TO WHICH CONFORMITY IS
DECLARED: IEC61326:2002
COMMUNICATION
RS-232 PORTS:
9-pin: DCE (electrically isolated) for computer or
non-CSI modem connection
COM1 to COM4: Four independent Tx/Rx pairs on
control ports (non-isolated)
Baud Rate: Selectable from 300 to 115.2 kbps.
Format: 7, 8 data bits; 1, 2 stop bits; odd, even, or
no parity
CS I/O PORT: Interface with CSI peripherals.
SDI-12: Digital Control ports 1, 3, 5, and 7 are
individually configurable and meet Standard version
1.
3 for datalogger mode. Up to ten SDI-12 sensors
are supported per port.
SDM PORT: Interface with CSI Synchronous
Devices for Measurement
PERIPHERAL PORT: Interface with CFM100
CompactFlash Module
SYSTEM
PROGRAM EXECUTION INTERVALS: 10 ms to
30 min. @ 10 ms increments
PROCESSOR: Renesas H8S 2674 (16-bit CPU with
32-bit internal core)
MEMORY: 2 Mbytes of Flash for operating system;
4 Mbytes of battery-backed SRAM for CPU usage,
program storage and data storage
CLOCK ACCURACY: ±3 min. per year
SYSTEM POWER REQUIREMENTS
VOLTAGE: 10 to 16 VDC
TYPICAL CURRENT DRAIN: Sleep Mode: 2 mA
1 Hz Sample Rate (one fast SE meas.): 3 mA
100 Hz Sample Rate (one fast SE meas.): 10 mA
100 Hz Sample Rate (one fast SE meas. w/RS-232
communications): 38 mA
Display on: add 1 mA to current drain
Backlight on: add 42 mA to current drain
INTERNAL BATTERIES: 10 Ahr alkaline or 7 Ahr
rechargeable base. 1200 mAhr lithium battery for
clock and SRAM backup typically provides 3 years
of ba
ck-up.
EXTERNAL BATTERIES: 12 VDC nominal; reverse
polarity protected.
PHYSICAL SPECIFICATIONS
SIZE: 9.5" x 7.0" x 3.8" (24.1 x 17.8 x 9.6 cm).
Terminal strips extend 0.875" (2.2 cm) and terminal
strip cover extends 1.575" (4.0 cm) above the panel.
WEIGHT: 3.6 lbs (1.6 kg) with low profile base; 8.3 lbs
(3.8 kg) with alkaline base; 10.7 lbs (4.8 kg) with
rechargeable base.
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 main-
tain electrical specifications, Campbell Scientific recommends recalibrating dataloggers every two years.
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