Campbell CR5000 Manuel d'utilisateur télécharger pdf (Page 8)

Campbell Scientic, Inc.

815 W 1800 N

Logan, Utah 84321-1784

(435) 753-2342

www.campbellsci.com

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CR5000 Speci cations

PROGRAM EXECUTION RATE

The CR5000 can measure one channel and store the

result in 500 µs; all 40 single-ended (SE) channels can

be measured in 8 ms (5 kHz aggregate rate).

ANALOG INPUTS

20 differential (DF) or 40 single-ended (SE) individually

configured. Channel expansion provided by AM16/32B

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 with input reversal is half the Basic Res.

Noise values are for DF with input reversal;

noise is greater with SE.

Input Basic 0 Int. 250 µs Int. 20/16.7 ms Int.

Rng (mV) Res (µV) (µV RMS) (µV RMS) (µV RMS)

±5000 167 70 60 30

±1000 33.3 30 12 6

±200 6.67 8 2.4 1.2

±50 1.67 3.0 0.8 0.3

±20 0.67 1.8 0.5 0.2

ACCURACY

±(0.05% of reading + offset), 0° to 40°C

±(0.075% of reading + offset), -25° to 50°C

±(0.10% of reading + offset), -40° to 85°C (-XT only)

The sensor and measurement noise is not included and

the offsets are the following:

Offset for DF w/input reversal = Basic Res + 1.0 µV

Offset for DF w/o input reversal = 2Basic Res + 2.0 µV

Offset for SE = 2Basic Res + 10 µV

MINIMUM TIME BETWEEN VOLTAGE

MEASUREMENTS:

Zero Integration: 125 µs

250 µs Integration: 475 µs

16.7 ms Integration: 19.9 ms

20 ms Integration: 23.2 ms

INPUT LIMITS: ±5 V

DC COMMON MODE REJECTION: >100 dB with

input reversal (>80 dB without input reversal)

NORMAL MODE REJECTION: 70 dB @ 60 Hz

when using 60 Hz rejection

SUSTAINED INPUT VOLTAGE W/O DAMAGE: ±16 Vdc

INPUT CURRENT: ±2 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 85°C (-XT only)

ANALOG OUTPUTS

4 switched voltage; 4 switched current; 2 continuous

voltage; switched outputs active only during measure-

ments, one at a time.

RANGE: Voltage outputs programmable between ±5 V;

current outputs programmable between ±2.5 mA

RESOLUTION: 1.2 mV for voltage outputs;

0.6 µA for current outputs

ACCURACY: ±10 mV for voltage outputs;

±10 µA for current outputs

CURRENT SOURCING: 50 mA for switched voltage;

15 mA for continuous

CURRENT SINKING: 50 mA for switched voltage;

5 mA for continuous (15 mA w/selectable option)

COMPLIANCE VOLTAGE: ±5 V for switched current

excitation

RESISTANCE MEASUREMENTS

Provides voltage ratio measurements of 4- and 6-wire

full bridges, and 2-, 3-, 4-wire half bridges. Direct resis-

tance measurements available with current

excitation. Dual-polarity excitation is recommended.

VOLTAGE RATIO ACCURACY

: Assumes input and

excitation reversal and an excitation voltage of at

least 2000 mV.

±(0.04% Reading + Basic Res/4) 0° to 40°C

±(0.05% Reading + Basic Res/4) -25° to 50°C

±(0.06% Reading + Basic Res/4) -40° to 85°C (-XT)

ACCURACY

WITH CURRENT EXCITATION:

Assumes input and excitation reversal, and an

excitation current, I

, of at least 1 mA.

±(0.075% Reading + Basic Res/2I

) 0° to 40°C

±(0.10% Reading + Basic Res/2I

) -25° to 50°C

±(0.12% Reading + Basic Res/2I

) -40° to 85°C (-XT)

The sensor and measurement noise is not included.

PERIOD AVERAGING MEASUREMENTS

The average period for a single cycle is determined by

measuring the duration of a specified number of cycles.

Any of the 40 SE analog inputs can be used; signal

attenuation and ac coupling may be required.

INPUT FREQUENCY RANGE:

Input Signal (peak to peak) Min. Max

Range Min. Max

Pulse W. Freq.

±5000 600 mV 10 V 2.5 µs 200 kHz

±1000 100 mV 2.0 V 5.0 µs 100 kHz

±200 4 mV 2.0 V 25 µs 20 kHz

Maximum signals must be centered around datalogger ground.

RESOLUTION: 70 ns/number of cycles measured

ACCURACY: ±(0.03% of Reading + Resolution)

PULSE COUNTERS

Two 16-bit inputs selectable for switch closure, high

frequency pulse, or low-level ac.

MAXIMUM COUNT: 4 x 10

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: 400 kHz

Maximum Input Voltage: ±20 V

Voltage Thresholds: Count upon transition from

below 1.5 V to above 3.5 V at low frequencies.

Larger input transitions are required at high

frequencies because of 1.2 µs time constant filter.

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

8 ports selectable as binary inputs or control outputs.

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

low < 0.1 V

OUTPUT RESISTANCE: 330 ohms

INPUT STATE: high 3.0 to 5.3 V; low -0.3 to 0.8 V

INPUT RESISTANCE: 100 kohms

SWITCHED 12 V

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.

EMI and ESD PROTECTION

The CR5000 is encased in metal and incorporates EMI

filtering on all inputs and outputs. Gas discharge tubes

provide robust ESD protection on all terminalblock

inputs and outputs. The following European CE stan-

dards apply.

EMC tested and conforms to BS EN61326:1998.

Details of performance criteria applied are available

upon request.

Warning: This is a Class A product. In a domestic

environment this product may cause radio

interference in which case the user may be

required to correct the interference at the user’s

own expense.

CPU AND INTERFACE

PROCESSOR: Hitachi SH7034

MEMORY: Battery-backed SRAM provides 2 Mbytes

for data and operating system use with 128 kbytes

reserved for program storage. Expanded data

storage with PCMCIA type I, type II, or type III

card, or CF card (requires an adapter).

DISPLAY: 8-line-by-21 character alphanumeric or

128 x 64 pixel graphic LCD display w/backlight.

SERIAL INTERFACES: Optically isolated RS-232

9-pin DCE port for computer or non-CSI modem

connection. CS I/O 9-pin port for Campbell

Scientific peripherals.

BAUD RATES: Selectable from 1,200 to 115,200 bps.

ASCII protocol is eight data bits, one start bit, one

stop bit, no parity.

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

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

SYSTEM POWER REQUIREMENTS

VOLTAGE: 11 to 16 Vdc

TYPICAL CURRENT DRAIN: 400 µA software power

off; 1.5 mA sleep mode; 4.5 mA at 1 Hz (200 mA

at 5 kHz) sample rate.

INTERNAL BATTERIES: 7 Ahr rechargeable base

(optional); 1650 mAhr lithium battery for clock and

SRAM backup, 10 years of service typical, less at

high temperatures.

EXTERNAL BATTERIES: 11 to 16 Vdc; reverse

polarity protected.

PHYSICAL SPECIFICATIONS

SIZE: 9.8” x 8.3” x 4.5” (24.7 cm x 21.0 cm x 11.4 cm)

Terminal strips extend 0.4” (1.0 cm).

WEIGHT: 4.5 lbs (2.0 kg) with low-profile base;

12.2 lbs (5.5 kg) with rechargeable base

WARRANTY

3 years against defects in materials and workmanship.

Campbell Scientiﬁ c, Inc.

Printed July 2010

Electrical speci cations are valid over a -25° to +50°C range unless otherwise speci ed; non-condensing environment required. To maintain electrical

speci cations, Campbell Scienti c recommends recalibrating dataloggers every two years. We recommend that you con rm system con guration and

critical speci cations with Campbell Scienti c before purchase.

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Campbell CR5000 Manuel d'utilisateur Page 8

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