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CR1000 Specifications

Campbell Scientific, Inc.

Printed September 2005

PROGRAM EXECUTION RATE

10 ms to 30 min. @ 10 ms increments

ANALOG INPUTS

8 differential (DF) or 16 single-ended (SE) individually

configured. Channel expansion provided by AM16/32

and AM25T multiplexers.

RANGES, RESOLUTION AND TYPICAL INPUT

NOISE: Basic resolution (Basic Res) is the A/D

resolution of a single conversion. Resolution of

DF measurements with input reversal is half the

Basic Res. Noise values are for DF measurements

with input reversal; noise is greater with SE mea-

surements.

Input Basic 250 µs Int. 50/60 Hz Int.

Range (mV) Res (µV) (µV RMS) (µV RMS)

±5000 1330 385 192

±2500 667 192 95.9

±250 66.7 19.2 19.2

±25 6.7 2.3 1.9

±7.5 2 0.62 0.58

±2.5 0.67 0.34 0.19

ACCURACY

±(0.06% of reading + offset), 0° to 40°C

±(0.12% of reading + offset), -25° to 50°C

±(0.18% of reading + offset), -55° to 85°C (-XT only)

The sensor and measurement noise are not included and

the offsets are the following:

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 + 3.0 µV

MINIMUM TIME BETWEEN VOLTAGE

MEASUREMENTS: Includes the measurement time

and conversion to engineering units. For voltage

measurements, the CR1000 integrates the input

signal for 0.25 ms or a full 16.66 ms or 20 ms line

cycle for 50/60 Hz noise rejection. DF measure-

ments with input reversal incorporate two integra-

tions with reversed input polarities to reduce thermal

offset and common mode errors and therefore take

twice as long.

250 µs Analog Integration: ~1 ms SE

1/60 Hz Analog Integration: ~20 ms SE

1/50 Hz Analog Integration: ~25 ms SE

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; ±90 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, -55° to 85°C (-XT only)

ANALOG OUTPUTS

3 switched voltage, active only during measurement,

one at a time.

RANGE AND RESOLUTION: Voltage outputs pro-

grammable between ±2.5 V with 0.67 mV resolution.

ACCURACY: ±(0.06% of setting + 0.8 mV), 0° to 40°C

±(0.12% of setting + 0.8 mV), -25° to 50°C

±(0.18% of setting + 0.8 mV), -55° to 85°C (-XT only)

CURRENT SOURCING/SINKING: ±25 mA

RESISTANCE MEASUREMENTS

MEASUREMENT TYPES: The CR1000 provides

ratiometric measurements of 4- and 6-wire full

bridges, and 2-, 3-, and 4-wire half bridges.

Precise, dual polarity excitation using any of the

3 switched voltage excitations eliminates dc errors.

RATIO ACCURACY

: Assuming excitation voltage of

at least 1000 mV, not including bridge resistor error.

±(0.04% of reading + offset)/V

The sensor and measurement noise are not included and

the offsets are the following:

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 + 3.0 µV

Offset values are reduced by a factor of 2 when

excitation reversal is used.

PERIOD AVERAGING MEASUREMENTS

The average period for a single cycle is determined by

measuring the average duration of a specified number

of cycles. The period resolution is 192 ns divided by

the specified number of cycles to be measured; the

period accuracy is ±(0.01% of reading + resolution).

Any of the 16 SE analog inputs can be used for period

averaging. Signal limiting are typically required for the

SE analog channel.

INPUT FREQUENCY RANGE:

Input Signal (peak to peak)

Min. Max

Range Min Max Pulse W. Freq.

±2500 mV 500 mV 10 V 2.5 µs 200 kHz

±250 mV 10 mV 2 V 10 µs 50 kHz

±25 mV 5 mV 2 V 62 µs 8 kHz

±2.5 mV 2 mV 2 V 100 µs 5 kHz

The signal is centered at the datalogger ground.

The maximum frequency = 1/(Twice Minimum Pulse Width)

for 50% of duty cycle signals.

PULSE COUNTERS

Two 24-bit inputs selectable for switch closure, high

frequency pulse, or low-level ac.

MAXIMUM COUNTS PER SCAN: 16.7x10

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:

Maximum Input Frequency: 250 kHz

Maximum Input Voltage: ±20 V

Voltage Thresholds: Count upon transition from

below 0.9 V to above 2.2 V after input filter with

1.2 µs time constant.

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 I/O PORTS

8 ports software selectable, as binary inputs or control

outputs. C1-C8 also provide edge timing, subroutine

interrupts/wake up, switch closure pulse counting, high

frequency pulse counting, asynchronous communica-

tions (UART), SDI-12 communications, and SDM

communications.

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

INPUT STATE: high 3.8 to 5.3 V; low -0.3 to 1.2 V

INPUT HYSTERISIS: 1.4 V

INPUT RESISTANCE: 100 kohms

SWITCHED 12 V

One 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.

SDI-12 INTERFACE SUPPORT

Control ports 1, 3, 5, and 7 may be configured for

SDI-12 asynchronous communications. Up to ten

SDI-12 sensors are supported per port. It meets

SDI-12 Standard version 1.3 for datalogger mode.

CE COMPLIANCE

STANDARD(S) TO WHICH CONFORMITY IS

DECLARED: BS EN61326:2002

CPU AND INTERFACE

PROCESSOR: Hitachi H8S 2322 (16-bit CPU with

32-bit internal core)

MEMORY: 2 Mbytes of Flash for operating system;

2 Mbytes of battery-backed SRAM for CPU usage,

program storage and data storage; 4 Mbytes optional

SERIAL INTERFACES: CS I/O port is used to

interface with Campbell Scientific peripherals;

RS-232 port is for computer or non-CSI modem

connection.

PARALLEL INTERFACE: 40-pin interface for attaching

data storage or communication peripherals such as

the CFM100 module

BAUD RATES: Selectable from 300 bps to 115.2 kbps.

ASCII protocol is one start bit, one stop bit, eight

data bits, and no parity.

CLOCK ACCURACY: ±3 min. per year (-30° to 85°C);

±5 min. per year (-55° to 85°C, -XT only)

SYSTEM POWER REQUIREMENTS

VOLTAGE: 9.6 to 16 Vdc

TYPICAL CURRENT DRAIN:

Sleep Mode: ~0.6 mA

1 Hz Sample Rate (one fast SE meas.): ~0.6 mA

100 Hz Sample Rate (one fast SE meas.): ~7.0 mA

100 Hz Sample Rate (one fast SE meas. w/RS-232

communications): <7.0 mA

EXTERNAL BATTERIES: 12 Vdc nominal; reverse

polarity protected.

PHYSICAL SPECIFICATIONS

MEASUREMENT & CONTROL MODULE SIZE:

8.5" x 3.9" x 0.85" (21.6 x 9.9 x 2.2 cm)

CR1000WP WIRING PANEL SIZE: 9.4" x 4" x 2.4"

(23.9 x 10.2 x 6.1 cm); additional clearance required

for serial cable and sensor leads.

WEIGHT: 2.1 lbs (1 kg)

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, Campbell Scientific recommends recalibrating dataloggers every two years.

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