Campbell CR800 Manual do Utilizador descarregar pdf (Página 8)

Campbell Scientic, Inc. | 815 W 1800 N | Logan, UT 84321-1784 | (435) 227-9000 | www.campbellsci.com

USA

Campbell Scientic, Inc.

May 5, 2015

CR800-Series Specications

PROGRAM EXECUTION RATE

10 ms to one day @ 10 ms increments

ANALOG INPUTS (SE1-SE6 or DIFF1-DIFF3)

3 differential (DIFF) or 6 single-ended (SE) individually config-

ured input channels. Channel expansion provided by optional

analog multiplexers.

RANGES and RESOLUTION: Basic resolution (Basic Res)

is the resolution of a single A/D conversion. A DIFF mea-

surement with input reversal has better (finer) resolution

by by twice than Basic Res.

Range (mV)

DIFF Res (µV)

Basic Res (µV)

±5000 667 1333

±2500 333 667

±250 33.3 66.7

±25 3.33 6.7

±7.5 1.0 2.0

±2.5 0.33 0.67

Range overhead of ~9% on all ranges guarantees that

full-scale values will not cause over range.

Resolution of DIFF measurements with input reversal.

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)

Accuracy does not include sensor and measurement noise.

Offsets are defined as:

Offset for DIFF w/input reversal = 1.5·Basic Res + 1.0 µV

Offset for DIFF w/o input reversal = 3·Basic Res + 2.0 µV

Offset for SE = 3·Basic Res + 3.0 µV

ANALOG MEASUREMENT SPEED:

Integra-

tion Type/

Code

Integra-

tion Time

Settling

Time

Total Time

SE w/

No Rev

DIFF w/

Input Rev

250 250 µs 450 µs

~1 ms ~12 ms

60 Hz

16.67 ms 3 ms

~20 ms ~40 ms

50 Hz

20.00 ms 3 ms

~25 ms ~50 ms

Includes 250 µs for conversion to engineering units.

AC line noise filter.

INPUT NOISE VOLTAGE: For DIFF measurements with input

reversal on ±2.5 mV input range; digital resolution dominates

for higher ranges.

250 µs Integration: 0.34 µV RMS

50/60 Hz Integration: 0.19 µV RMS

INPUT LIMITS: ±5 V

DC COMMON MODE REJECTION: >100 dB

NORMAL MODE REJECTION: 70 dB @ 60 Hz when using

60 Hz rejection

INPUT VOLTAGE RANGE W/O MEASUREMENT

CORRUPTION: ±8.6 Vdc max.

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 GΩ 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 (VX1-VX2)

2 switched voltage outputs sequentially active only during

measurement.

RANGE AND RESOLUTION:

Channel Range Resolution

Current

Source/Sink

(VX 1–2) ±2.5 Vdc 0.67 mV ±25 mA

Voltage outputs programmable between ±2.5 V with 0.67 mV

resolution.

ANALOG OUTPUT ACCURACY (VX):

±(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)

Vx FREQUENCY SWEEP FUNCTION: Switched outputs

provide a programmable swept frequency, 0 to 2500 mv

square waves for exciting vibrating wire transducers.

PERIOD AVERAGE

Any of the 6 SE analog inputs can be used for period aver-

aging. Accuracy is ±(0.01% of reading + resolution), where

resolution is 136 ns divided by the specified number of cycles

to be measured.

INPUT AMPLITUDE AND FREQUENCY:

Voltage

Gain

Input

Range

(±mV)

Input Signal

(peak to peak)

Min

Pulse

Width

(µV)

Max

Freq

(kHz) Min (mV)

Max (V)

1 250 500 10 2.5 200

10 25 10 2 10 50

33 7.5 5 2 62 8

100 2.5 2 2 100 5

Signal centered around Threshold (see PeriodAvg() instruction).

Signal centered around datalogger ground.

Maximum frequency = 1/(twice minimum pulse width) for 50%

of duty cycle signals.

RATIOMETRIC MEASUREMENTS

MEASUREMENT TYPES: Provides ratiometric resistance

measurements using voltage excitation. Three switched volt-

age excitation outputs are available for measurements of 4-

and 6-wire full bridges, and 2-, 3-, and 4-wire half bridges.

Optional excitation polarity reversal minimizes dc errors.

RATIOMETRIC MEASUREMENT ACCURACY:

9,10, 11

±(0.04% of voltage measurement + offset)

Accuracy specification assumes excitation reversal for

excitation voltages < 1000 mV. Assumption does not include

bridge resistor errors and sensor and measurement noise.

Estimated accuracy, ∆X (where X is value returned from the

measurement with Multiplier =1, Offset = 0):

BrHalf() instruction: ∆X = ∆V

BrFull() instruction ∆X = 1000∆V

, expressed as mVV

−1

∆

−1

is calculated from the ratiometric measurement

accuracy. See Resistance Measurements Section in the

manual for more information.

Offsets are defined as:

Offset for DIFF w/input reversal = 1.5Basic Res + 1.0 µV

Offset for DIFF w/o input reversal = 3Basic Res + 2.0 µV

Offset for SE = 3Basic Res + 3.0 µV

Excitation reversal reduces offsets by a factor of two.

PULSE COUNTERS (P1-P2)

2 inputs individually selectable for switch closure, high frequency

pulse, or low-level ac. Independent 24-bit counters for each input.

MAXIMUM COUNTS PER SCAN: 16.7 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: 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: 12 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 (C1-C4)

4 ports software selectable, as binary inputs or control out-

puts. Provide on/off, pulse width modulation, edge timing,

subroutine interrupts/wake up, switch closure pulse counting,

high-frequency pulse counting, asynchronous communications

(UARTs), SDI-12 communications, and SDM communications.

LOW FREQUENCY MODE MAX: <1 kHz

HIGH FREQUENCY MAX: 400 kHz

SWITCH CLOSURE FREQUENCY MAX: 150 Hz

EDGE TIMING RESOLUTION: 540 ns

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

OUTPUT RESISTANCE: 330 Ω

INPUT STATE: high 3.8 to 16 V; low -8.0 to 1.2 V

INPUT HYSTERISIS: 1.4 V

INPUT RESISTANCE:

100 kΩ with inputs <6.2 Vdc

220 Ω with inputs ≥6.2 Vdc

SERIAL DEVICE / RS-232 SUPPORT: 0 to 5 Vdc UART

SWITCHED 12 V (SW12)

One independent 12 Vdc unregulated source is 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

COMMUNICATIONS

RS-232 PORTS:

DCE 9-pin: (not electrically isolated) for computer con-

nection or connection of modems not manufactured

by Campbell Scientific.

COM1 to COM2: Two independent Tx/Rx pairs on control

ports (non-isolated); 0 to 5 Vdc UART

Baud Rate: selectable from 300 bps to 115.2 kbps.

Default Format: 8 data bits; 1 stop bits; no parity

Optional Formats: 7 data bits; 2 stop bits; odd, even parity

CS I/O PORT: Interface with telecommunication peripherals

manufactured by Campbell Scientific

SDI-12: Digital control ports C1 or C3 are individually configu-

rable and meet SDI-12 Standard version 1.3 for datalogger

mode. Up to 10 SDI-12 sensors are supported per port.

PROTOCOLS SUPPORTED: PakBus, AES-128 Encrypted

PakBus, Modbus, DNP3, FTP, HTTP, XML, HTML, POP3,

SMTP, Telnet, NTCIP, NTP, Web API, SDI-12, SDM

SYSTEM

PROCESSOR: Renesas H8S 2322 (16-bit CPU with 32-bit

internal core running at 7.4 MHz)

MEMORY: 2 MB of flash for operating system; 4 MB of

battery-backed SRAM for CPU usage, program storage

and final data storage

RTC CLOCK ACCURACY: ±3 min. per year. Correction

via GPS optional.

RTC CLOCK RESOLUTION: 10 ms

SYSTEM POWER REQUIREMENTS

VOLTAGE: 9.6 to 16 Vdc

INTERNAL BATTERIES: 1200 mA h lithium battery for clock

and SRAM backup, typically provides 3 years of backup

EXTERNAL BATTERIES: Optional 12 Vdc nominal alkaline

and rechargeable available. Power connection is reverse

polarity protected.

TYPICAL CURRENT DRAIN @ 12 Vdc:

Sleep Mode: 0.7 mA typical; 0.9 mA max.

1 Hz Sample Rate (1 fast SE measurement): 1 mA

100 Hz Sample Rate (1 fast SE measurement): 16.2 mA

100 Hz Sample Rate (1 fast SE meas w/RS-232

communication): 28 mA

Active external keyboard display adds 7 mA (100 mA with

backlight on).

PHYSICAL

DIMENSIONS: 24.1 x 10.4 x 5.1 cm (9.5 x 4.1 x 2 in);

additional clearance required for cables and leads.

WEIGHT: 0.7 kg (1.5 lb)

WARRANTY

3-years against defects in materials and workmanship.

Electrical specications are valid over a -25° to +50°C, non-condensing environment, unless otherwise specied. Recalibration recommended every three years.

Critical specications and system conguration should be conrmed with Campbell Scientic before purchase.

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