USER GUIDE
SCC-AO10 Isolated Analog
Output Module
The SCC-AO10 is an isolated voltage output module with an output range
of 10 V. The output voltage level is controlled by the DAC output of an
E/M Series DAQ device. You can increase the output voltage level to
20 V by connecting two SCC-AO10 modules in series.
Conventions
The following conventions are used in this guide:
»
The » symbol leads you through nested menu items and dialog box options
to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash. When this symbol is marked on
the product, refer to the Read Me First: Safety and Radio-Frequency
Interference document, shipped with the product, for precautions to take.
When symbol is marked on a product it denotes a warning advising you to
take precautions to avoid electrical shock.
When symbol is marked on a product it denotes a component that may be
hot. Touching this component may result in bodily injury.
bold
Bold text denotes items that you must select or click in the software, such
as menu items and dialog box options. Bold text also denotes parameter
names.
italic
Italic text denotes variables, emphasis, a cross-reference, an introduction
to a key concept, or text as it appears on a hardware label. Italic text also
denotes text that is a placeholder for a word or value that you must supply.
Note Software scaling of measurements is not supported on the Macintosh operating
system. Refer to the SCC-AO10 Connector Pin Assignments section.
You can download NI documents from ni.com/manuals. To download
the latest version of NI-DAQmx, click Download Software at ni.com.
Device Specific Information
Note For general SCC module installation and signal connection information, and
information about the SC-2345/2350 carrier, refer to the SCC Quick Start Guide, available
for download at ni.com/manuals.
Installing the SCC-AO10
Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting/disconnecting any signal wires.
Plug the SCC-AO10 into either SC-2345/2350 analog output socket
J(X+17), where X is 0 or 1. The SC-2345/2350 routes the voltage output of
E/M Series DAQ device analog output channel AO (X) to the SCC-AO10.
Connecting the SCC-AO10 to a Load
Caution Refer to the Read Me First: Safety and Radio-Frequency Interference document
before removing equipment covers or connecting/disconnecting any signal wires.
Note The signal names have changed. Refer to ni.com/infoand enter rdtntgto
confirm the signal names.
The SCC-AO10 has a three-pin screw-terminal connector that accepts
28 to 16 AWG wires.
The screw terminals are labeled by pin numbers 1 to 3. Pin 1 is the isolated
ground. Pins 2 and 3 both connect to the isolated voltage output for
flexibility in field wiring.
Caution Connecting an external voltage source to the output terminals of the SCC-AO10
may damage the module.
© National Instruments Corporation
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SCC-AO10 Isolated Analog Output Module User Guide
Figures 1 and 2 show the SCC-AO10 connected to a nonreferenced load
and to a load with a high common-mode voltage.
E/M Series
DAQ Device SCC-AO10
3
AO (X )
2
Load
AO GND
1
I
Figure 1. SCC-AO10 Connected to a Nonreferenced Load
E/M Series
DAQ Device SCC-AO10
3
AO (X )
2
Load
AO GND
1
I
Figure 2. SCC-AO10 Connected to a Load with a High Common-Mode Voltage
Connecting Two SCC-AO10 Modules in Series
You can increase the maximum total output voltage to 20 V by connecting
two SCC-AO10 modules in series. Plug the two modules into sockets J17
and J18 of the SC-2345/2350, and wire the modules to a load as shown in
Figure 3.
SCC-AO10 Isolated Analog Output Module User Guide
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E/M Series
DAQ Device
SCC-AO10 in Socket J18
3
2
1
AO 1
+
VOUT2
+
–
AO GND
I
VOutTotal
SCC-AO10 in Socket J17
3
2
1
AO 0
Load
+
VOUT1
–
–
AO GND
I
Figure 3. Connecting Two SCC-AO10 Modules in Series
The SC-2345/2350 routes the E/M Series DAQ device analog output
channels AO 0 and AO 1 to the SCC-AO10 modules, and the resulting
maximum output voltage range is 20 V. Refer to Figure 3 and use the
following formula to calculate the total output voltage from both
SCC-AO10 modules:
VOutTotal = VOUT1 + VOUT2
where
VOutTotal is the total output voltage from both SCC-AO10 modules
VOUT1 is the voltage across terminals 1 and 3 of the SCC-AO10
module in socket J17
VOUT2 is the voltage across terminals 1 and 3 of the SCC-AO10
module in socket J18
For information about how to configure the SCC-AO10 module with
NI-DAQmx, refer to the SCC Quick Start Guide.
© National Instruments Corporation
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SCC-AO10 Isolated Analog Output Module User Guide
Using the SCC-AO10
This section contains information regarding scaling voltage measurements
and isolated ground references.
Scaling Voltage Measurements
The SCC-AO10 is a 10 V isolated analog output module. The output
voltage is controlled by an E/M Series DAQ device AO output channel,
AO (X). The relationship between the AO (X) voltage level and the output
voltage level of the SCC-AO10 is a one-to-one linear relationship. That is,
VAO(X) = VAO10
where
VAO(X) is the AO 0 voltage level
VAO10 is the SCC-AO10 voltage output in volts
Isolated Ground Reference
Each SCC-AO10 module is referenced to its own isolated ground. Each
isolated ground can have up to 60 VDC of common-mode voltage between
itself and any other channel ground or chassis ground. Refer to the
Connecting the SCC-AO10 to a Load section for ways to use the isolated
ground in signal connections.
Calibrating Gain and Offset Errors
The SCC-AO10 is calibrated at the factory before shipment. To adjust the
gain and offset of the SCC-AO10 in your system using an E/M Series DAQ
device, you need a voltage meter and a 1/8 in. flathead screwdriver. Before
adjusting the SCC-AO10, allow 30 minutes for the DAQ device to warm
up to its nominal operating temperature.
To adjust the gain and offset of the SCC-AO10, complete the following
steps:
1. Disconnect the load from the SCC-AO10 you want to calibrate.
2. Set an output range of –10 to +10 V for AO (X), the E/M Series DAQ
device channel connected to the SCC-AO10.
3. Connect the negative lead of the voltmeter to the isolated ground
terminal (pin 1) and the positive lead to the voltage output terminal
(pin 2 or 3) of the SCC-AO10.
4. Using your software, set AO (X) to output 0 VDC.
SCC-AO10 Isolated Analog Output Module User Guide
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5. Adjust the offset potentiometer on the top of the SCC-AO10 until the
voltmeter reads 0 VDC 100 μV. The offset is now calibrated.
6. Using your software, have AO (X) output 9.9 VDC.
Adjust the gain potentiometer on the top of the SCC-AO10 until the
voltmeter reads 9.9 VDC. The gain is now calibrated.
Specifications
These ratings are typical at 25 °C unless otherwise stated.
Electrical
Number of output channels.................... One nonreferenced (floating)
Input range ............................................. 10 V
Output range........................................... 10 V
Current drive .......................................... 30 mA
Gain nonlinearity.................................... 0.5% of full-scale output range
Output noise ........................................... 2.5 mVrms typ; 4 mVrms max
Bandwidth.............................................. >23 kHz
Slew rate................................................. 1 V/μs
Short circuit protection
Current ............................................ 37 mA max
Duration .......................................... Unlimited
Load impedance ..................................... 10,000 pF max
© National Instruments Corporation
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SCC-AO10 Isolated Analog Output Module User Guide
Power Requirement
Analog power .........................................180 mW max at full load
172 mW max with no load
+15 V...............................................6 mA max at full load
5.73 mA max with no load
–15 V ...............................................6 mA max at full load
5.73 mA max with no load
Digital power (+5 V) ..............................1.15 W max at full load
600 mW max with no load
+5 V.................................................230 mA max
120 mA max with no load
Physical
1.87 cm
(0.74 in.)
7.93 cm
(3.12 in.)
3.55 cm
(1.4 in.)
Figure 4. SCC-AO10 Dimensions
Weight ....................................................28 g (1.0 oz)
I/O connectors.........................................One 20-pin right-angle male
connector; one 3-pin screw
terminal
Field-wiring diameter .............................28 to 16 AWG
SCC-AO10 Isolated Analog Output Module User Guide
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Maximum Working Voltage
(Signal + common-mode) each input should remain within 42.4 Vpeak or
60 VDC of ground.
Maximum working voltage refers to the signal voltage plus the CMV.
Channel-to-earth (inputs) ....................... 42.4 Vpeak or 60 VDC,
Measurement Category I
Caution This device is rated for Measurement Category I and is intended to carry signal
voltages no greater than 42.4 Vpeak or 60 VDC. Do not use this device for connection to
signals or for measurements within Categories II, III, or IV.
Isolation Voltage
Channel-to-earth isolation
Continuous...................................... 60 VDC,
Measurement Category I
Withstand........................................ 2300 Vrms verified by a 5 s
dielectric withstand type test
Environmental
Operating temperature............................ 0 to 50 °C
Storage temperature ............................... –20 to 70 °C
Humidity ................................................ 10 to 90% RH, noncondensing
Maximum altitude.................................. 2,000 m
Pollution Degree (indoor use only)........ 2
Stability
Recommended warm-up time ................ 10 min (30 min for connected
E/M Series DAQ device)
Output offset drift................................... 300 μV/°C
Gain temperature coefficient.................. 300 ppm/°C
© National Instruments Corporation
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SCC-AO10 Isolated Analog Output Module User Guide
Safety
This product meets the requirements of the following standards of safety
for electrical equipment for measurement, control, and laboratory use:
•
•
IEC 61010-1, EN 61010-1
UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the product label or the Online
Product Certification section.
Electromagnetic Compatibility
This product meets the requirements of the following EMC standards for
electrical equipment for measurement, control, and laboratory use:
•
•
•
•
EN 61326 (IEC 61326): Class A emissions; Basic immunity
EN 55011 (CISPR 11): Group 1, Class A emissions
AS/NZS CISPR 11: Group 1, Class A emissions
FCC 47 CFR Part 15B: Class A emissions
ICES-001: Class A emissions
Note For the standards applied to assess the EMC of this product, refer to the Online
Product Certification section.
Note For EMC compliance, operate this product according to the documentation.
Note For EMC compliance, operate this device with shielded cables.
CE Compliance
This product meets the essential requirements of applicable European
Directives as follows:
•
•
2006/95/EC; Low-Voltage Directive (safety)
2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Online Product Certification
Refer to the product Declaration of Conformity (DoC) for additional
regulatory compliance information. To obtain product certifications and
the DoC for this product, visit ni.com/certification, search by model
number or product line, and click the appropriate link in the Certification
column.
SCC-AO10 Isolated Analog Output Module User Guide
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Environmental Management
NI is committed to designing and manufacturing products in an
environmentally responsible manner. NI recognizes that eliminating
certain hazardous substances from our products is beneficial to the
environment and to NI customers.
For additional environmental information, refer to the NI and the
Environment Web page at ni.com/environment. This page contains the
environmental regulations and directives with which NI complies, as well
as other environmental information not included in this document.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of the life cycle, all products must be sent to a WEEE recycling
center. For more information about WEEE recycling centers and National Instruments
WEEE initiatives, visit ni.com/environment/weee.
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SCC-AO10 Connector Pin Assignments
Figure 5 shows the I/O connector pins on the bottom of the SCC-AO10.
4
1
2
3
5
1 Pin 1
2
Pin 2
3
PWB Key
4
Pin 19
5 Pin 20
Figure 5. SCC Module Bottom View
© National Instruments Corporation
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SCC-AO10 Isolated Analog Output Module User Guide
Table 1 lists the signal connection corresponding to each pin.
Table 1. SCC-AO10 I/O Connector Signal Assignments
Pin Number
Signal
1
2
E/M Series AO (X)
E/M Series AO GND
3
—
4
E/M Series AO GND
5
—
6
—
7
—
8
—
9
+5 V
10
11
12
13
14
15
16
17
18
19
20
GND
—
+ 5 V reference
+15 V
–15 V
—
—
—
—
—
—
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Aug08
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