Campbell Scientific CR3000 CR3000 Micrologger - Page 79

79

Section 6. CR3000 Specifications

CR3000 specifications are valid from

─

25° to 50°C in non

‐

condensing environments unless otherwise specified. Recalibration is recommended every two years. Critical specifications and system

configurations should be confirmed with a Campbell Scientific applications engineer before purchase.

PROGRAM EXECUTION RATE

2.1

10 ms to one day at 10 ms increments

3.0

ANALOG INPUTS (SE 1–28, DIFF 1–14)

3.0.1

Fourteen differential (DIFF) or 28 single

‐

ended (SE) individually

configured input channels. Channel expansion provided by

optional analog multiplexers.

3.1.0

RANGES and RESOLUTION: With reference to the following table,

basic resolution (Basic Res) is the resolution of a single

A/D

(p.

449

)

conversion. A DIFF measurement with input reversal has

better (finer) resolution by twice than Basic Res.

3.1.1

‐‐

30

Range (mV)

1

DIFF Res,

μ

V

2

(17 bit)

Basic Res,

μ

V

(16 bit)

±5000

±1000

±200

±50

±20

83.33

16.67

3.33

0.83

0.33

167

33.3

6.67

1.67

0.67

Range overhead of

≈

9% on all ranges guarantees full

‐

scale

voltage will not cause over

‐

range.

2

Resolution of DIFF measurements with input reversal.

3.2

‐‐

30

ANALOG INPUT 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)

3.2.1

3

Accuracy does not include sensor and measurement noise. Offset

definitions:

Offset = 1.5 x Basic Res + 1.0 μV (for DIFF measurement w/ input

reversal)

Offset = 3 x Basic Res + 2.0 μV (for DIFF measurement w/o input

reversal)

Offset = 3 x Basic Res + 5.0 μV (for SE measurement)

3.3

ANALOG MEASUREMENT SPEED:

‐‐

30

‐‐‐

Total Time

4

‐‐‐

Inte

‐

gration

Type

Code

Inte

‐

gration

Time

Settling

Time

SE

with

no

Rev

DIFF

with

Input

Rev

250

_60Hz

5

_50Hz

5

250 μs

16.67 ms

20.00 ms

200 μs

3 ms

3 ms

≈

0.7 ms

≈

20 ms

≈

23 ms

≈

1.4 ms

≈

40 ms

≈

46 ms

Includes 250

μ

s for conversion to engineering units.

5

AC line noise filter

3.4

INPUT

‐

NOISE VOLTAGE: For DIFF measurements with input

reversal on ±20 mV input range (digital resolution dominates for

higher ranges): 250

μ

s Integration: 0.4

μ

V RMS, 50/60 Hz

Integration: 0.19

μ

V RMS

INPUT LIMITS: ±5 Vdc

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; ±120 nA @

85°C

INPUT RESISTANCE: 20 G

Ω

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)

4.0

ANALOG OUTPUTS (VX 1–4, IX 1–3, CAO 1–2)

4.0.1

‐‐

30

Four switched voltage and three switched current outputs

sequentially active only during measurement. Two continuous

outputs.

4.0.2

RANGES AND RESOLUTION:

‐‐

Chan

‐

nel

Range

Res

‐

olution

Current

Source

/ Sink

Compli

‐

ance

Voltage

VX 1–4

±5 Vdc

0.17 mV

±50 mA

N/A

IX 1–3

±2.5 mA

0.08 μA

N/A

±5 Vdc

CAO 1–2

±5 Vdc

0.17 mV

±15 mA

N/A

4.2

‐‐

30

ANALOG OUTPUT ACCURACY (VX and CAO):

±(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)

4.3

‐‐

30

ANALOG OUTPUT ACCURACY (IX)

±(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)

4.4

VX FREQUENCY SWEEP FUNCTION: Switched outputs provide a

programmable swept frequency, 0 to 5000 mV square waves for

exciting vibrating wire transducers.

PERIOD AVERAGE

3.5.0a

Any of the 28 SE analog inputs can be used for period

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

resolution is 68 ns divided by the specified number of cycles to

be measured.

INPUT AMPLITUDE AND FREQUENCY:

3.5.1

‐‐

30

Volt

‐

Input

Signal

Peak

‐

Peak

Min

Pulse

Max

age

Gain

Range

Code

Min

mV

6

Max

V

7

Width

μs

Freq

kHz

8

1

5

20

50

mV1000

mV200

mV50

mV20

200

20

5

2

10

2

2

2

2.5

5.0

10.0

100

200

100

50

20

6

Signal to be centered around

Threshold

(see

PeriodAvg()

instruction).

7

Signal to be centered around ground.

8

The maximum frequency = 1/(twice minimum pulse width)

for 50% of duty cycle signals.

5.0

RATIOMETRIC MEASUREMENTS

5.1

‐‐

30

MEASUREMENT TYPES: The CR3000 provides ratiometric

resistance measurements using voltage or current excitation.

Four switched voltage excitation outputs are available for

measurement of four

‐

and six

‐

wire full bridges, and two

‐

,

three

‐

, and four

‐

wire half bridges. Three switched current

excitation outputs are available for direct resistance

measurements. Optional excitation polarity reversal minimizes

dc errors.

5.2

‐‐

30

RATIOMETRIC MEASUREMENT ACCURACY

9,10,11

:

±(0.02% of Voltage Measurement + Offset

12

), 0° to 40°C


12

),

─

25° to 50°C


12

),

─

40° to 85°C (

‐

XT)

5.2.1

9

Accuracy specification assumes excitation reversal for

excitation voltages < 500 mV and excitation currents < 500 μA.

Assumption does not include bridge resistor errors and sensor

and measurement noise.

10

For

Resistance()

instruction, the sensor resistance is

determined from V

S

/I

X

, where excitation current I

X

is

measured across a 1000

Ω

, ±0.005% at 25

˚

C, 2 ppm•

˚

C

‐

1

TCR

internal resistor.

11

Estimated accuracy,

∆

X (where X is value returned from

measurement with

Multiplier

=1,

Offset

= 0):

BRHalf()

Instruction:

∆

X=

∆

V

1/

V

X

.

BRFull()

Instruction

:

∆

X = 1000 x

∆

V

/

V

X

, expressed as mV•V

‐

1

.

Note

∆

V

1

is calculated from the ratiometric measurement

accuracy. See manual section

Resistance Measurements

(p.

300

)

for more information.

12

Offset definitions:

Offset = 1.5 x Basic Res + 1.0 μV (for DIFF measurement w/

input reversal)

Offset = 3 x Basic Res + 2.0 μV (for DIFF measurement w/o

input reversal)

Offset = 3 x Basic Res + 5.0 μV (for SE measurement)

Note

Excitation reversal reduces offsets by a factor of two.

6.0

PULSE COUNTERS (P 1–4)

6.0.1

Four inputs individually selectable for switch closure, high

frequency pulse, or low

‐

level ac. Independent 24

‐

bit counters

for each input.

6.1

MAXIMUM COUNTS PER SCAN: 16.8 x 10

6

6.2

SWITCH

‐

CLOSURE MODE:

Minimum Switch Closed Time: 5 ms

Minimum Switch Open Time: 6 ms

Max. Bounce Time: 1 ms open without being counted

6.3

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

μ

s time constant.

6.4

LOW

‐

LEVEL AC MODE: Internal ac coupling removes dc offsets

up to ±0.5 Vdc.

Input Hysteresis: 12 mV RMS @ 1 Hz

Maximum ac

‐

Input Voltage: ±20 V

Minimum ac

‐

Input Voltage:

Sine wave (mV RMS)

Range (Hz)

20

200

2000

5000

1.0 to 20

0.5 to 200

0.3 to 10,000

0.3 to 20,000

7.0

DIGITAL I/O PORTS (C 1

‐

8, SDM 1

‐

3)

7.0.1

Eight ports software selectable as binary inputs or control

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

subroutine interrupts / wake up, switch

‐

closure pulse counting,

high

‐

frequency pulse counting, asynchronous communications

(UARTs), and SDI

‐

12 communications.

7.0

DIGITAL I/O PORTS (C 1

‐

8, SDM 1

‐

3)

7.0.1

Eight ports software selectable as binary inputs or control

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

subroutine interrupts / wake up, switch

‐

closure pulse counting,

high

‐

frequency pulse counting, asynchronous communications

(UARTs), and SDI

‐

12 communications.

7.1

LOW FREQUENCY MODE MAX: <1 kHz

7.2

HIGH FREQUENCY MODE MAX: 400 kHz

7.3

SWITCH

‐

CLOSURE FREQUENCY MAX: 150 Hz

7.5

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

7.6

OUTPUT RESISTANCE: 330

Ω

7.7

INPUT STATE: high 3.8 to 16 V; low

‐

8.0 to 1.2 V

7.8

INPUT HYSTERISIS: 1.4 V

7.9

INPUT RESISTANCE:

100 k

Ω

with inputs < 6.2 Vdc

220

Ω

with inputs

≥

6.2 Vdc

7.10

SERIAL DEVICE / RS

‐

232 SUPPORT: 0 to 5 Vdc UART

7.11

‐‐

30

ADDITIONAL DIGITAL PORTS: SDM

‐

C1, SDM

‐

C2, SDM

‐

C3 are

dedicated for measuring SDM devices.

7.12

SWITCHED 12 Vdc (SW12V)

Two independent 12 Vdc unregulated terminals switched on and

off under program control. Thermal fuse hold current = 900 mA

at 20°C, 650 mA at 50°C, and 360 mA at 85°C.

8.0

CE COMPLIANCE

8.1

STANDARD(S) TO WHICH CONFORMITY IS DECLARED:

IEC61326:2002

9.0

COMMUNICATION

9.1

RS

‐

232 PORTS:

DCE nine

‐

pin: (electrically isolated) for computer connection or

connection of modems not manufactured by Campbell

Scientific.

COM1 to COM4: four 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: eight data bits; one stop bits; no parity.

Optional Formats: seven data bits; two stop bits; odd, even

parity.

9.2

CS I/O PORT: Interface with telecommunications peripherals

manufactured by Campbell Scientific.

9.3

SDI

‐

12: Digital control ports C1, C3, C5, C7 are individually

configurable and meet SDI

‐

12 Standard v. 1.3 for datalogger

mode. Up to ten SDI

‐

12 sensors are supported per port.

9.4

‐‐

30

PERIPHERAL PORT: 40

‐

pin interface for attaching CompactFlash

or Ethernet peripherals.

9.5

PROTOCOLS SUPPORTED: PakBus, AES

‐

128 Encrypted PakBus,

Modbus, DNP3, FTP, HTTP, XML, HTML, POP3, SMTP, Telnet,

NTCIP, NTP, Web API, SDI

‐

12, SDM.

10.0

SYSTEM

10.1

PROCESSOR: Renesas H8S 2674 (16

‐

bit CPU with 32

‐

bit internal

core running at

≈

21.9 MHz)

10.2

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

‐

backed SRAM for CPU usage, program storage, and final data

storage.

10.3

REAL

‐

TIME CLOCK ACCURACY: ±3 min. per year. Correction via

GPS optional.

10.4

RTC CLOCK RESOLUTION: 10 ms

11.0

SYSTEM POWER REQUIREMENTS

11.1

VOLTAGE: 10 to 16 Vdc

11.2

‐‐

30

INTERNAL BATTERIES: 1200

‐

mAhr lithium battery for clock and

SRAM backup. Typically provides 3 years of backup. Optional

10

‐

Ahr alkaline or 7

‐

Ahr rechargeable battery + base available as

primary power supply.

11.3

EXTERNAL BATTERIES: Optional 12 Vdc nominal alkaline and

rechargeable available. Power connection is reverse polarity

protected.

11.4

TYPICAL CURRENT DRAIN at 12 Vdc:

Sleep Mode: 2 mA

1 Hz Sample Rate (one fast SE meas.)3 m3A

100 Hz Sample Rate (one fast SE meas.): 10 mA

100 Hz Sample Rate (one fast SE meas. with RS

‐

232

communications): 38 mA

Active integrated keyboard display adds 1 mA (42 mA with

backlight on).

12.0

PHYSICAL

12.1

DIMENSIONS:

241 x 178 x 96 mm (9.5 x 7.0 x 3.8 in.); additional

clearance required for cables and leads.

12.2

MASS / WEIGHT:

‐‐

Base Type:

Mass (kg)

Weight (lbs)

Low Prof Base

1.6

3.6

Alkaline Base

3.8

8.3

Recharge Base

4.8

10.7

13.0

WARRANTY

13.1

Warranty is stated in the published price list and in opening

pages of this and other user manuals.

Campbell Scientific CR3000 CR3000 Micrologger - Page 79

CR3000 Specifications - price

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