Campbell CR5000, Руководство оператора

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CR5000 Overview
OV-20
OV5. Specifications
PROGRAM EXECUTION RATE
The CR5000 can measure one channel and store the
result in 500 µs; all 40 SE* channels can be measured
in 8 ms (5 kHz aggregate rate).
ANALOG INPUTS
DESCRIPTION: 20 DF* or 40 SE, individually
configured. Channel expansion provided through
AM16/32, AM416, and AM25T Multiplexers.
RANGES, RESOLUTION, AND TYPICAL INPUT
NOISE: Basic Resolution (Basic Res) is the A/D
resolution of a single conversion. Resolution of
DFM* with input reversal is half the Basic Res.
Noise values are for DFM with input reversal; noise
is greater with SEM.*
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 R Offset) 0° to 40°C
±(0.075% of R Offset) -25° to 50°C
±(0.10% of R Offset) -40° to 85°C
Offset for DFM w/input reversal =
Basic Res +1 µV
Offset for DFM w/o input reversal =
2Basic Res + 2 µV
Offset for SEM = 2Basic Res + 10 µV
MINIMUM TIME BETWEEN MEASUREMENTS:
Zero Integration: 125 µs
250 µs Integration: 475 µs
16.7 ms Integration: 19.9 ms
20 ms Integration: 23.2 ms
COMMON MODE RANGE: ±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 WITHOUT DAMAGE:
±16 Vdc
INPUT CURRENT: ±2 nA typ., ±10 nA max. @ 50°C
INPUT RESISTANCE: 20 G
Ω
typical
ACCURACY OF INTERNAL THERMOCOUPLE
REFERENCE JUNCTION:
±0.25°C, 0° to 40°C
±0.5°C, -25° to 50°C
±0.7°C, -40° to 85°C
ANALOG OUTPUTS
DESCRIPTION: 4 switched voltage; 4 switched cur-
rent; 2 continuous voltage; switched outputs active
only during measurements, one at a time.
RANGE: Voltage (current) outputs programmable
between ±5 V (±2.5 mA)
RESOLUTION: 1.2 mV (0.6 µA) for voltage (current)
outputs
ACCURACY: ±10 mV (±10 µA) for voltage (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
resistance measurements available with current excita-
tion. Dual-polarity excitation is recommended.
VOLTAGE RATIO ACCURACY
†
: Assumes input and
excitation reversal and an excitation voltage of at
least 2000 mV.
±(0.04% R Basic Res/4) 0° to 40°C
±(0.05% R Basic Res/4) -25° to 50°C
±(0.06% R Basic Res/4) -40° to 85°C
ACCURACY
†
WITH CURRENT EXCITATION:
Assumes input and excitation reversal, and an
excitation current,
I
x
, of at least 1 mA.
±(0.075% R Basic Res/2
I
x
) 0° to 40°C
±(0.10% R Basic Res/2 I
x
) -25° to 50°C
±(0.12% R Basic Res/2 I
x
) -40° to 85°C
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 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.
Rng (mV) Min. Max.
1
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
1
Maximum signals must be centered around
datalogger ground.
RESOLUTION: 70 ns/number of cycles measured
ACCURACY: ±(0.03% of R Resolution)
PULSE COUNTERS
DESCRIPTION: Two 16-bit inputs selectable for switch
closure, high frequency pulse, or low-level ac.
MAXIMUM COUNT: 4 x 10
9
counts per scan
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:
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 frequen-
cies. 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
DESCRIPTION: 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
Ω
INPUT STATE: high 3.0 to 5.3 V; low -0.3 to 0.8 V
INPUT RESISTANCE: 100 k
Ω
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 terminal
block inputs and outputs. The following European
standards 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.
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 interface for computer or modem. CSI/O
9-pin interface for peripherals such as CSI
modems.
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
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
Three years against defects in materials and
workmanship.
Electrical specifications are valid over a -25° to +50°C range unless otherwise specified; testing over -40° to +85°C available as
an option, excludes batteries. Non-condensing environment required. Yearly calibrations are recommended to maintain electri-
cal specifications.
We recommend that you confirm system
configuration and critical specifications with
Campbell Scientific before purchase.
*SE(M): Single-Ended (Measurement)
*DF(M): Differential (Measurement)
†
Sensor and measurement noise not included.