Campbell CR23X Bedienungsanleitung PDF herunterladen (Seite 6)

CR23X Specifications

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.

PROGRAM EXECUTION RATE

Program is synchronized with real-time up to 100 Hz.

Two fast (250 µs) single-ended measurements can

write to final storage at 100 Hz. Burst measurements

to 1.5 kHz are possible over short intervals.

ANALOG INPUTS

DESCRIPTION: 12 differential or 24 single-ended,

individually configured. Channel expansion

provided through AM16/32 or AM416 Relay

Multiplexers and AM25T Thermocouple

Multiplexers.

ACCURACY: ±0.025% of FSR, 0° to 40°C

±0.05% of FSR, -25° to 50°C

±0.075% of FSR, -40° to 80°C; (-XT only)

Note: ±5 µV offset voltage error is possible with

single-ended (SE) measurements.

RANGES AND RESOLUTION:

Input Resolution (µV) Accuracy (mV)

Range (mV) Diff. SE (-25° to 50°C)

±5000 166 333 ±5.00

±1000 33.3 66.6 ±1.00

±200 6.66 13.3 ±0.20

±50 1.67 3.33 ±0.05

±10 0.33 0.66 ±0.01

INPUT SAMPLE RATES: Includes the measurement

time and conversion to engineering units. Differ-

ential measurements incorporate two integra-

tions with reversed input polarities to reduce

thermal offset and common mode errors. Fast

measurement integrates the signal for 250 µs;

slow measurement integrates for one power

line cycle (50 or 60 Hz).

Fast single-ended voltage: 2.1 ms

Fast differential voltage: 3.1 ms

Slow single-ended voltage (60 Hz): 18.3 ms

Slow differential voltage (60 Hz): 35.9 ms

Fast differential thermocouple: 6.9 ms

INPUT NOISE VOLTAGE: Typical for ±10 mV Input

Range; digital resolution dominates for higher

ranges.

Fast differential: 0.60 µV rms

Slow differential (60 Hz): 0.15 µV rms

Fast single-ended: 1.20 µV rms

Slow single-ended (60 Hz): 0.30 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 WITHOUT DAMAGE:

±16 Vdc max.

INPUT CURRENT: ±2.5 nA typ., ±10 nA max. @ 50°C

INPUT RESISTANCE: 20 Gohms typical

ACCURACY OF BUILT-IN REFERENCE JUNCTION

THERMISTOR (for thermocouple measurements):

±0.25°C, 0° to 40°C

±0.5°C, -25° to 50°C

±0.7°C, -40° to 80°C (-XT only)

ANALOG OUTPUTS

DESCRIPTION: 4 switched, active only during

measurement, one at a time; 2 continuous.

RANGE: Programmable between ±5 V

RESOLUTION: 333 µV

ACCURACY: ±5 mV; ±2.5 mV (0° to 40°C)

CURRENT SOURCING: 50 mA for switched; 15 mA

for continuous

CURRENT SINKING: 50 mA for switched, 5 mA for

continuous (15 mA for continuous with Boost

selected in P133).

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 CR23X provides ratio-

metric measurements of 4- and 6-wire full bridges,

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

polarity excitation using any of the 4 switched

outputs eliminates dc errors. Conductivity

measurements use a dual polarity 0.75 ms excita-

tion to minimize polarization errors.

ACCURACY: ±0.02% of FSR (±0.015%, 0° to 40°C)

plus bridge resistor error.

PERIOD AVERAGING MEASUREMENTS

DESCRIPTION: The average period for a single

cycle is determined by measuring the duration

of a specified number of cycles. Any of the 24

SE analog inputs can be used. Signal attenuation

and ac coupling are typically required.

INPUT FREQUENCY RANGE:

Signal peak-to-peak

Min. Max

Min. Max. Pulse w. Freq.

500 mV 10.0 V 2.5 µs 200 kHz

40 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

Signals centered around datalogger ground

Assuming 50% duty cycle

RESOLUTION: 12 ns divided by the number of cycles

measured

ACCURACY: ±0.03% of reading

PULSE COUNTERS

DESCRIPTION: Four 8-bit or two 16-bit inputs

selectable for switch closure, high frequency pulse,

or low-level AC. Counters read at 10 or 100 Hz.

MAXIMUM COUNT RATE: 2.5 kHz and 25 kHz, 8-bit

counter read at 10 Hz and 100 Hz, respectively;

400 kHz, 16-bit counter.

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:

Internal ac coupling removes dc offsets up to

±0.5 V.

Input Hysteresis: 15 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

DESCRIPTION: 8 ports selectable as binary inputs or

control outputs. Ports C5-C8 capable of counting

switch closures and high frequency pulses.

HIGH FREQUENCY MAX: 2.5 kHz

OUTPUT VOLTAGES (no load): high 5.0 V ±0.1 V;

low < 0.1

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 SUPPORT

DESCRIPTION: Digital I/O Ports C5-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 sensors mode.

CE COMPLIANCE (as of 03/02)

STANDARD(S) TO WHICH CONFORMITY IS

DECLARED:

EN55022: 1995 and EN61326: 1998

EMI and ESD PROTECTION

IMMUNITY: Meets or exceeds following standards:

ESD: per IEC 1000-4-2; ±8 kV air, ±4 kV contact

discharge

RF: per IEC 1000-4-3; 3 V/m, 80-1000 MHz

EFT: per IEC 1000-4-4; 1 kV power, 500 V I/O

Surge: per IEC 1000-4-5; 1 kV power and I/O

Conducted: per IEC 1000-4-6; 3 V 150 kHz-80 MHz

Emissions and immunity performance criteria available

on request.

CPU AND INTERFACE

PROCESSORS: Hitachi 6303; Motorola 68HC708

supports communications.

PROGRAM STORAGE: Up to 16 kbytes for active

program; additional 16 kbytes for alternate

programs. Operating system stored in 512 kbytes

Flash memory.

DATA STORAGE: 1 Mbyte Flash standard.

Additional 4 Mbytes Flash available as an option.

DISPLAY: 24-character-by-2-line LCD

SERIAL INTERFACES: Optically isolated RS-232

9-pin interface for computer or modem. CS 9-pin

I/O interface for peripherals such as storage

modules or CSI modems.

BAUD RATES: Selectable at 300, 1200, 2400, 4800,

9600, 19.2K, 38.4K, and 76.8K. ASCII protocol

is one start bit, eight data bits, no parity, one

stop bit.

CLOCK ACCURACY: ±1 minute per month, -25° to

+50°C; ±2 minutes per month, -40° to +85°C

SYSTEM POWER REQUIREMENTS

VOLTAGE: 11 to 16 Vdc

TYPICAL CURRENT DRAIN: 2 mA quiescent with

display off (2.5 mA max), 7 mA quiescent with

display on, 45 mA during processing, and 70 mA

during analog measurement.

INTERNAL BATTERIES: 10 Ahr alkaline or 7 Ahr

rechargeable base. 1800 mAhr lithium battery

for clock and SRAM backup typically provides

10 years of service.

EXTERNAL BATTERIES: Any 11 to 16 Vdc battery

may be connected; reverse polarity protected.

PHYSICAL SPECIFICATIONS

SIZE: 9.5” x 7.0” x 3.8” (24.1 cm x 17.8 cm x 9.6 cm).

Terminal strips extend 0.4” (1.0 cm) and terminal

strip cover extends 1.3” (3.3 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.

We recommend that you confirm system

configuration and critical specifications with

Campbell Scientific before purchase.

Campbell Scientific, Inc.

Printed September 2002

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