National Instruments Isolated Analog Output Module SCC-AO10 User manual

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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.
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SCC-AO10 Isolated Analog Output Module User Guide 2 ni.com
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames, and extensions.
SC-2345 SC-2345 refers to both the SC-2345 connector block and the SC-2345 with
configurable connectors.
SCC SCC refers to any SCC Series signal conditioning module.
What You Need to Get Started
To set up and use the SCC-AO10, you need the following items:
❑Hardware
– SC-2345/2350 with one of the following:
• SCC-PWR01
• SCC-PWR02 and the PS01 power supply
• SCC-PWR03 (requires a 7 to 42 VDC power supply,
not included)
– One or more SCC-AO10
– 68-pin E/M Series DAQ device
– 68-pin cable
– Quick Reference Label
❑Software
– The latest version of NI-DAQmx
❑Documentation
– SCC-AO10 Isolated Analog Output Module User Guide
– SC-2345/2350 User Manual
– SCC Quick Start Guide
– Read Me First: Safety and Radio-Frequency Interference
– Documentation for your hardware
– Documentation for your software
❑Tools
– 1/8 in. flathead screwdriver
– Numbers 1 and 2 Phillips screwdrivers
– Wire insulation stripper
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©National Instruments Corporation 3 SCC-AO10 Isolated Analog Output Module User Guide
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 Xis 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/info and enter rdtntg to
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.
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SCC-AO10 Isolated Analog Output Module User Guide 4 ni.com
Figures 1 and 2 show the SCC-AO10 connected to a nonreferenced load
and to a load with a high common-mode voltage.
Figure 1. SCC-AO10 Connected to a Nonreferenced Load
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.
AO GND
SCC-AO10
E/M Series
DAQ Device
AO (X )
1
2
3
I
Load
AO GND
SCC-AO10
E/M Series
DAQ Device
AO (X )
1
2
3
I
Load
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©National Instruments Corporation 5 SCC-AO10 Isolated Analog Output Module User Guide
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:
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.
SCC-AO10 in Socket J18
1
2
3
I
SCC-AO10 in Socket J17
1
2
3
I
Load
AO GND
E/M Series
DAQ Device
AO 0
AO GND
AO 1
VOUT2
VOUT1
+
–
+
–
VOutTota
l
+
–
VOutTotal VOUT1 VOUT2 +=
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SCC-AO10 Isolated Analog Output Module User Guide 6 ni.com
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,
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.
VAO X() VAO10
=
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©National Instruments Corporation 7 SCC-AO10 Isolated Analog Output Module User Guide
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
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SCC-AO10 Isolated Analog Output Module User Guide 8 ni.com
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
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
1.87 cm
(0.74 in.) 7.93 cm
(3.12 in.)
3.55 cm
(1.4 in.)
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©National Instruments Corporation 9 SCC-AO10 Isolated Analog Output Module User Guide
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
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