Campbell CompactFlash CFM100 Uživatelský manuál Strana 8

  • Stažení
  • Přidat do mých příruček
  • Tisk
  • Strana
    / 8
  • Tabulka s obsahem
  • KNIHY
  • Hodnocené. / 5. Na základě hodnocení zákazníků
Zobrazit stránku 7
CR1000 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. We recommend that you confirm sys-
tem configuration and critical specifications with Campbell Scientific before purchase.
PROGRAM EXECUTION RATE
10 ms to 30 min. @ 10 ms increments
ANALOG INPUTS
8 differential (DF) or 16 single-ended (SE) individually
configured. Channel expansion provided by AM16/32
and AM25T multiplexers.
RANGES and RESOLUTION: Basic resolution
(Basic Res) is the A/D resolution of a single
conversion. Resolution of DF measurements
with input reversal is half the Basic Res.
Input Referred Noise Voltage
Input DF Basic
Range (mV)
1
Res (µV)
2
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
1
Range overhead of ~9% exists on all ranges to guarantee
that full-scale values will not cause over-range.
2
Resolution of DF measurements with input reversal.
ACCURACY
3
:
±(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
3
The sensor and measurement noise are not included and
the offsets are the following:
Offset for DF w/input reversal = 1.5·Basic Res + 1.0 µV
Offset for DF w/o input reversal = 3·Basic Res + 2.0 µV
Offset for SE = 3·Basic Res + 3.0 µV
INPUT NOISE VOLTAGE: For DF 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
MINIMUM TIME BETWEEN VOLTAGE
MEASUREMENTS: Includes the measurement time
and conversion to engineering units. For voltage
measurements, the CR1000 integrates the input
signal for 0.25 ms or a full 16.66 ms or 20 ms line
cycle for 50/60 Hz noise rejection. DF measure-
ments with input reversal incorporate two integra-
tions with reversed input polarities to reduce thermal
offset and common mode errors and therefore take
twice as long.
250 µs Analog Integration: ~1 ms SE
1/60 Hz Analog Integration: ~20 ms SE
1/50 Hz Analog Integration: ~25 ms SE
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 W/O DAMAGE:
±16 Vdc max.
INPUT CURRENT: ±1 nA typical, ±6 nA max.
@ 50°C; ±90 nA @ 85°C
INPUT RESISTANCE: 20 Gohms 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
3 switched voltage, active only during measurement,
one at a time.
RANGE AND RESOLUTION: Voltage outputs pro-
grammable between ±2.5 V with 0.67 mV resolution.
ACCURACY: ±(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)
CURRENT SOURCING/SINKING: ±25 mA
RESISTANCE MEASUREMENTS
MEASUREMENT TYPES: The CR1000 provides
ratiometric measurements of 4- and 6-wire full
bridges, and 2-, 3-, and 4-wire half bridges.
Precise, dual polarity excitation using any of the
3 switched voltage excitations eliminates dc errors.
RATIO ACCURACY
3
: Assuming excitation voltage of
at least 1000 mV, not including bridge resistor error.
±(0.04% of voltage reading + offset)/V
x
3
The sensor and measurement noise are not included and
the offsets are the following:
Offset for DF w/input reversal = 1.5·Basic Res + 1.0 µV
Offset for DF w/o input reversal = 3·Basic Res + 2.0 µV
Offset for SE = 3·Basic Res + 3.0 µV
Offset values are reduced by a factor of 2 when
excitation reversal is used.
PERIOD AVERAGING MEASUREMENTS
The average period for a single cycle is determined by
measuring the average duration of a specified number
of cycles. The period resolution is 192 ns divided by
the specified number of cycles to be measured; the
period accuracy is ±(0.01% of reading + resolution).
Any of the 16 SE analog inputs can be used for period
averaging. Signal limiting are typically required for the
SE analog channel.
INPUT FREQUENCY RANGE:
Input Signal (peak to peak)
4
Min. Max
5
Range Min Max Pulse W. Freq.
±2500 mV 500 mV 10 V 2.5 µs 200 kHz
±250 mV 10 mV 2 V 10 µs 50 kHz
±25 mV 5 mV 2 V 62 µs 8 kHz
±2.5 mV 2 mV 2 V 100 µs 5 kHz
4
The signal is centered at the datalogger ground.
5
The maximum frequency = 1/(Twice Minimum Pulse Width)
for 50% of duty cycle signals.
PULSE COUNTERS
Two 24-bit inputs selectable for switch closure, high
frequency pulse, or low-level ac.
MAXIMUM COUNTS PER SCAN: 16.7x10
6
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: 16 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
8 ports software selectable, as binary inputs or control
outputs. C1-C8 also provide edge timing, subroutine
interrupts/wake up, switch closure pulse counting, high
frequency pulse counting, asynchronous communica-
tions (UART), SDI-12 communications, and SDM
communications.
HIGH FREQUENCY MAX: 400 kHz
SWITCH CLOSURE FREQUENCY MAX: 150 Hz
OUTPUT VOLTAGES (no load): high 5.0 V ±0.1 V;
low <0.1
OUTPUT RESISTANCE: 330 ohms
INPUT STATE: high 3.8 to 5.3 V; low -0.3 to 1.2 V
INPUT HYSTERISIS: 1.4 V
INPUT RESISTANCE: 100 kohms
SWITCHED 12 V
One 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.
SDI-12 INTERFACE SUPPORT
Control ports 1, 3, 5, and 7 may be configured for
SDI-12 asynchronous communications. Up to ten
SDI-12 sensors are supported per port. It meets
SDI-12 Standard version 1.3 for datalogger mode.
CE COMPLIANCE
STANDARD(S) TO WHICH CONFORMITY IS
DECLARED: IEC61326:2002
CPU AND INTERFACE
PROCESSOR: Renesas H8S 2322 (16-bit CPU with
32-bit internal core)
MEMORY: 2 Mbytes of Flash for operating system;
2 Mbytes of battery-backed SRAM for CPU usage,
program storage and data storage; 4 Mbytes optional
SERIAL INTERFACES: CS I/O port is used to
interface with Campbell Scientific peripherals;
RS-232 port is for computer or non-CSI modem
connection.
PARALLEL INTERFACE: 40-pin interface for attaching
data storage or communication peripherals such as
the CFM100 module
BAUD RATES: Selectable from 300 bps to 115.2 kbps.
ASCII protocol is one start bit, one stop bit, eight
data bits, and no parity.
CLOCK ACCURACY: ±3 min. per year
SYSTEM POWER REQUIREMENTS
VOLTAGE: 9.6 to 16 Vdc
TYPICAL CURRENT DRAIN:
Sleep Mode: ~0.6 mA
1 Hz Scan
(8 diff. meas., 60 Hz rej., 2 pulse meas.)
w/RS-232 communication: 19 mA
w/o RS-232 communication: 4.2 mA
1 Hz Scan
(8 diff. meas., 250 µs integ., 2 pulse meas.)
w/RS-232 communication: 16.7 mA
w/o RS-232 communication: 1 mA
100 Hz Scan
(4 diff. meas., 250 µs integ.)
w/RS-232 communication: 27.6 mA
w/o RS-232 communication: 16.2 mA
CR1000KD CURRENT DRAIN:
Inactive: negligible
Active w/o backlight: 7 mA
Active w/backlight: 100 mA
EXTERNAL BATTERIES: 12 Vdc nominal; reverse
polarity protected.
PHYSICAL SPECIFICATIONS
MEASUREMENT & CONTROL MODULE SIZE:
8.5" x 3.9" x 0.85" (21.6 x 9.9 x 2.2 cm)
CR1000WP WIRING PANEL SIZE: 9.4" x 4" x 2.4"
(23.9 x 10.2 x 6.1 cm); additional clearance required
for serial cable and sensor leads.
WEIGHT: 2.1 lbs (1 kg)
WARRANTY
Three years against defects in materials and work-
manship.
Copyright © 2004, 2006
Campbell Scientific, Inc.
Printed November 2006
815 W. 1800 N. | Logan, Utah 84321-1784 | USA | phone (435) 753-2342 | www.campbellsci.com
Australia | Brazil | Canada | England | France | Germany | South Africa | Spain | USA [headquarters]
Zobrazit stránku 7
1 2 3 4 5 6 7 8

Komentáře k této Příručce

Žádné komentáře