SCM5B33
Isolated True RMS Input Modules
FEATURES
q
INTERFACES RMS VOLTAGE (0 – 300V) OR RMS CURRENT (0 – 5A)
q
DESIGNED FOR STANDARD OPERATION WITH FREQUENCIES OF
45HZ TO 1000HZ (EXTENDED RANGE TO 20Khz)
q
COMPATIBLE WITH STANDARD CURRENT AND POTENTIAL
TRANSFORMERS
q
INDUSTRY STANDARD OUTPUTS OF EITHER 0-1MA, 0-20mA,
4-20MA, 0-5V OR 0-10VDC
q
±0.25%
FACTORY CALIBRATED ACCURACY (ACCURACY CLASS
0.2)
q
1500 VRMS CONTINUOUS TRANSFORMER BASED ISOLATION
q
INPUT OVERLOAD PROTECTED TO 480V MAX (PEAK AC & DC) OR
10A RMS CONTINUOUS
q
ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION
q
REGULATORY COMPLIANCE (TO BE DETERMINED)
DESCRIPTION
Each SCM5B33 True RMS input module provides a single channel of AC
input which is converted to its True RMS dc value, filtered, isolated,
amplified, and converted to a standard process voltage or current output
(Figure 1).
The SCM5B modules are designed with a completely isolated computer side
circuit which can be floated to
±50V
from Power Common, pin 16. This
complete isolation means that no connection is required between I/O
Common and Power Common for proper operation of the output switch. If
desired, the output switch can be turned on continuously by simply connecting
pin 22, the Read-Enable pin to I/O Common, pin 19.
The field voltage or current input signal is processed through a pre-amplifier
and RMS converter on the field side of the isolation barrier. The converted dc
signal is then chopped by a proprietary chopper circuit and transferred across
the transformer isolation barrier, suppressing transmission of common
mode spikes and surges. The computer side circuitry reconstructs, filters and
converts the signal to industry standard outputs. Modules are powered from
+5VDC,
±5%.
For current output models an external loop supply is required having a
compliance voltage of 14 to 48VDC. Connection, with series load, is between
Pin 20 (+) and Pin 19 (-).
4
+EXC
**
AC Source +In
I
IN
–In
**
–EXC
4
6
3
5
2
1
3
Surge
Suppression
and
Protection
Pre-Amp,
Conversion
Isochopper™
Amplifier
Pat Pending
LPF
20
V
OUT or
I
OUT
*
+V
–V
19
I/O Common
Isolated
Computer-Side
Power
22
RD EN\
Backpanel
Term Block
+V
* Current Input Models Only
** Add Jumpers for Current Input Modules
(provided with SCM5B33-06, 07)
–V
17
Isolated
Field-Side
Power
Power
Oscillator
+5V
16
Power Common
FIGURE 1. SCM5B33 Block Diagram.
DATAFORTH
A Burr-Brown Company
®
Call 800-444-7644
For Information and Assistance
48
SPECIFICATIONS
Typical at T = +25°C and +5V power.
A
Module
Input
Signal Range
Standard Frequency Range
Extended Frequency Range
Impedance
Coupling
Protection
(1)
Continuous (-01 thru -05)
Continuous (-06 thru -07)
Transient (-01 thru -05)
Transient (-06 thru -07)
Output
Signal Range
Current Limit
Voltage Limit
Resistance
Protection
Ripple and Noise (100Khz)
Accuracy
(3)(4)
Sinusoid
50/60 Hz
45Hz to 1kHz
1kHz to 20kHz
Non-Sinusoid
Crest Factor = 1 to 2
Crest Factor = 2 to 3
Crest Factor = 3 to 4
Crest Factor = 4 to 5
Vs. Temperature
Isolation (Common Mode)
Input to Output, Input to Power
Continuous
Transient
Output to Power
Continuous
Rejection (50-60Hz Common Mode)
Response Time (0 to 99%)
Output Enable Control
Selection Time
Voltage
Max Logic “0”
Min / Max Logic “1”
Current, “0,1”
Loop Voltage
Load Resistance (maximum)
Supply Voltage
Current
Sensitivity
Environmental
Operating Temp. Range
Storage Temp. Range
Relative Humidity
Emissions
Immunity
Dimensions
NOTE:
SCM5B33
100mV to 300V rms, 0 to 5A rms
45Hz to 1000Hz
1kHz to 20kHz
1 MΩ
±1%
shunted by 100pF (-01 thru -05),
0.10Ω (-06), 0.025Ω (-07)
AC
300V rms
10A rms
ANSI/IEEE C37.90.1-1989
See note 2
0-5V or 0-10V or 0-1mA or 0-20mA or 4-20mA
1.4mA (0-1mA models), 30mA (0/4-20mA models),
8mA (0-5, 0-10V models)
±18V
(0-5, 0-10V models)
50Ω (0-5, 0-10V models)
Continuous Short to Ground
0.025% Span rms
ORDERING INFORMATION
MODEL
SCM5B33-01
SCM5B33-02
SCM5B33-03
SCM5B33-04
SCM5B33-05
SCM5B33-06
SCM5B33-07
SCM5B33-01B
SCM5B33-02B
SCM5B33-03B
SCM5B33-04B
SCM5B33-05B
SCM5B33-06B
SCM5B33-07B
SCM5B33-01C
SCM5B33-02C
SCM5B33-03C
SCM5B33-04C
SCM5B33-05C
SCM5B33-06C
SCM5B33-07C
SCM5B33-01D
SCM5B33-02D
SCM5B33-03D
SCM5B33-04D
SCM5B33-05D
SCM5B33-06D
SCM5B33-07D
SCM5B33-01E
SCM5B33-02E
SCM5B33-03E
SCM5B33-04E
SCM5B33-05E
SCM5B33-06E
SCM5B33-07E
INPUT* (rms)
0-100mV
0-1V
0-10V
0-150V
0-300V
0-1A
0-5A
0-100mV
0-1V
0-10V
0-150V
0-300V
0-1A
0-5A
0-100mV
0-1V
0-10V
0-150V
0-300V
0-1A
0-5A
0-100mV
0-1V
0-10V
0-150V
0-300V
0-1A
0-5A
0-100mV
0-1V
0-10V
0-150V
0-300V
0-1A
0-5A
OUTPUT* (dc)
0-5V
0-5V
0-5V
0-5V
0-5V
0-5V
0-5V
0-1mA
0-1mA
0-1mA
0-1mA
0-1mA
0-1mA
0-1mA
4-20mA
4-20mA
4-20mA
4-20mA
4-20mA
4-20mA
4-20mA
0-10V
0-10V
0-10V
0-10V
0-10V
0-10V
0-10V
0-20mA
0-20mA
0-20mA
0-20mA
0-20mA
0-20mA
0-20mA
±0.25%
Span
±0.25%
Reading Additional Factor
±0.75%
Reading Additional Factor
±0.05%
Reading Additional Error
±0.15%
Reading Additional Error
±0.30%
Reading Additional Error
±0.40%
Reading Additional Error
±100ppm/°C
1500Vrms max
ANSI/IEEE C37.90.1-1989
50Vdc max
100dB
<400ms
6.0µS @ C
LOAD
= 0 to 2000pF
+0.8V
+2.4V / +36V
0.5µA
+7.5Vdc min, +26Vdc max, -40˚C to +85˚C
(Loop Voltage - 14) / (Loop Current)
+5VDC
±5%
120mA
±200ppm/%
-40˚C to +85˚C
-40˚C to +85˚C
0 to 90% noncondensing
EN50081-1, ISM Group 1, Class A (Radiated, Conducted)
EN50082-1, ISM Group 1, Class A (ESD, RF, EFT)
2.28" x 2.26" x 0.60" (58mm x 57mm x 15mm)
(1) SCM5B33 and SCMPB01, 02, 03, 04, 05, 06, 07, XEV rating only. Backpanels obtained
from other sources may have lower ratings.
(2) For 1 to 25 seconds the max allowable transient current rating is
√2500
/ (event time). For
less than 1 second, ANSI/IEEE C-37.90.1-1989 applies with a 0.05Ω load. For greater than
25 seconds, the 10A rms continuous rating applies.
(3) At standard 60Hz factory calibration. Consult factory for calibration at other frequencies.
(4) For 10-100% rated span. Add an additional 0.25% error for 0-10% Span measurements.
Accuracy includes nonlinearity, hysteresis and repeatability but not source or external shunt
inaccuracy (if used).
* Modules can be ordered with other input/output ranges. Consult factory for
ordering details and specifications.
49
Call 800-444-7644
For Information and Assistance
DATAFORTH
A Burr-Brown Company
®
stm32/stm8
京公网安备 11010802033920号
EEWORLD
