National Instruments 9215E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9215E
4-Channel, ±10 V, 16-Bit Simultaneous Analog
Input Module

NI 9215E Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9215E
and includes dimensions, terminal assignments, and specifications for
the NI 9215E. In this document, the NI 9215E with screw terminal and
NI 9215E with BNC are referred to inclusively as the NI 9215E. Visit
ni.com/info and enter rdsoftwareversion to determine which
software you need for the modules you are using. For information
about installing, configuring, and programming the system, refer to the
system documentation. Visit ni.com/info and enter cseriesdoc
for information about C Series documentation.
Caution National Instruments makes no electromagnetic
compatibility (EMC) or CE marking compliance claims
for the NI 9215E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9215E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.

© National Instruments Corp. 3 NI 9215E Operating Instructions and Specifications
NI 9215E Dimensions
The following figure shows the dimensions of the NI 9215E.
Figure 1. NI 9215E Dimensions in Millimeters (Inches)
73.4 in. (2.89 mm)
0.0 in. (0.00 mm)
26.7 in. (1.05 mm) 58.4 in. (2.30 mm) 66.0 in. (2.60 mm)
0.0 in. (0.00 mm)

NI 9215E Operating Instructions and Specifications 4 ni.com
Connecting the NI 9215E
The NI 9215E provides connections for four differential analog
input channels.
Figure 2. Terminal Assignments of the NI 9215E with Screw Terminal
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–
NC
COM
0
1
2
3
4
5
6
7
8
9

© National Instruments Corp. 5 NI 9215E Operating Instructions and Specifications
Figure 3. Connector Assignments of the NI 9215E with BNC
AI0+
AI0–
AI1+
AI1–
AI2+
AI2–
AI3+
AI3–

NI 9215E Operating Instructions and Specifications 6 ni.com
The NI 9215E with screw terminal has a 10-terminal detachable
screw-terminal connector. The NI 9215E with BNC has four BNC
connectors.
Each channel of the NI 9215E has an AI+ terminal to which you
can connect the positive voltage signal, and an AI– terminal or
shield to which you can connect the negative voltage signal. The
NI 9215E with screw terminal also has a common terminal, COM,
that is internally connected to the isolated ground reference of the
module.
Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9215E with screw terminal.

© National Instruments Corp. 7 NI 9215E Operating Instructions and Specifications
Connecting Differential Voltage Signals to the
NI 9215E
You can connect grounded or floating differential signals to the
NI 9215E. Connect the positive voltage signal to AI+ and the
negative voltage signal to AI–. To connect grounded differential
signals to the NI 9215E with screw terminal, you must also connect
the signal reference to the COM terminal, as shown in Figure 4.
Figure 4. Connecting a Grounded Differential Voltage Signal to
the NI 9215E with Screw Terminal
Voltage
Source
+
–
AI+
AI–
COM NI 9215E with
Screw Terminal

NI 9215E Operating Instructions and Specifications 8 ni.com
To connect floating differential signals to the NI 9215E with screw
terminal, you must connect the negative lead of the signal to COM
through a 1 MΩresistor to keep the voltage source within the
common-mode voltage range, as shown in Figure 5. If the voltage
source is outside of the common-mode range, then the NI 9215E
does not read data accurately. The NI 9215E with BNC has internal
circuitry that keeps the voltage source within the common-mode
range. For more information about the common-mode voltage
range, refer to the Specifications section.
Figure 5. Connecting a Floating Differential Voltage Signal to
theNI9215EwithScrewTerminal
1 MΩ
Resistor NI 9215E with
Screw Terminal
AI+
AI–
COM
Voltage
Source
+
–

© National Instruments Corp. 9 NI 9215E Operating Instructions and Specifications
Connecting Single-Ended Voltage Signals to the
NI 9215E
To connect single-ended voltage signals to the NI 9215E with
screw terminal, you must also connect the ground signal to the
COM terminal to keep the common-mode voltage in the specified
range, as shown in Figure 6. For more information about the
common-mode voltage range, refer to the Specifications section.
Figure 6. Connecting a Single-Ended Voltage Signal to the
NI9215EwithScrewTerminal
+
–
AI+
AI–
COM
Voltage
Source
NI 9215E with
Screw Terminal

NI 9215E Operating Instructions and Specifications 10 ni.com
NI 9215E Circuitry
The NI 9215E channels share a common ground that is isolated
from other modules in the system. The NI 9215E protects
each channel from overvoltages. For more information about
overvoltage protection, refer to the Specifications section.
The incoming analog signal on each channel is buffered and
conditioned by the instrumentation amplifier and is then sampled
by a 16-bit ADC. The channels have independent track-and-hold
amplifiers that allow you to sample all four channels
simultaneously. Refer to Figures 7 and 8 for input circuitry
illustrations of the NI 9215E with screw terminal and the
NI 9215E with BNC.

© National Instruments Corp. 11 NI 9215E Operating Instructions and Specifications
Figure 7. Input Circuitry for One Channel on
theNI9215EwithScrewTerminal
COM
AI +
AI –
NI 9215E with
Screw Terminal
Isolated
ADC
Overvoltage
Protection
Overvoltage
Protection
Instrumentation
Amplifier
+
–

NI 9215E Operating Instructions and Specifications 12 ni.com
The NI 9215E with BNC has a resistor that ensures the input
voltage does not drift outside of the common-mode range.
Figure 8. Input Circuitry for One Channel on the NI 9215E with BNC
AI +
AI –
Isolated
ADC
NI 9215E with BNC
+
–
Instrumentation
Amplifier
100 kΩ
Overvoltage
Protection
Overvoltage
Protection

© National Instruments Corp. 13 NI 9215E Operating Instructions and Specifications
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.

NI 9215E Operating Instructions and Specifications 14 ni.com
Specifications
The following specifications are typical for the range –40 to 85 °C
internal to any enclosures unless otherwise noted.
Input Characteristics
Number of channels .......................... 4 analog input channels
ADC resolution................................. 16 bits
Type of ADC..................................... Successive approximation
register (SAR)
Input range ........................................ ±10.0 V

© National Instruments Corp. 15 NI 9215E Operating Instructions and Specifications
Input voltage ranges
Measurement Voltage,
AI+ to AI–
Maximum Voltage
(Signal + Common Mode)
Minimum*
(V)
Typical
(V)
Maximum
(V)
Screw
Terminal BNC
±10.2 ±10.4 ±10.6 Each channel
must remain
within
±10.2 V of
common.
All inputs
must remain
within 10.2 V
of the average
AI–inputs.
* The minimum measurement voltage range is the largest voltage the NI 9215E is
guaranteed to accurately measure.

NI 9215E Operating Instructions and Specifications 16 ni.com
Overvoltage protection ..................... ±30 V
Conversion time
Channel 0 only ........................... 4.4 μs
Channels 0 and 1 ........................ 6 μs
Channels 0, 1, and 2 ................... 8 μs
Channels 0, 1, 2, and 3 ............... 10 μs
Accuracy
Stability
Gain drift .................................... 10 ppm/ºC
Offset drift .................................. 60 μV/ºC
Measurement Conditions
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated, max (–40 to 85 °C) 0.2% 0.082%
Calibrated, typ (25 °C, ±5 °C) 0.02% 0.014%
Uncalibrated, max (–40 to 85 °C) 1.05% 0.82%
Uncalibrated, typ (25 °C, ±5 °C) 0.6% 0.38%
* Range equals 10.4 V

© National Instruments Corp. 17 NI 9215E Operating Instructions and Specifications
CMRR (fin = 60 Hz) .......................... 73 dB min
Input bandwidth (–3 dB)................... 420 kHz min
Input impedance resistance
NI 9215E (Between any AI+
and AI– terminals) ............... 1 GΩ
NI 9215E with BNC
(Between any
two AI– terminals) ............... 200 kΩ
Input bias current .............................. 10 nA
Input noise
RMS ........................................... 1.2 LSBrms
Peak-to-peak............................... 7 LSB
Crosstalk ........................................... –80 dB

NI 9215E Operating Instructions and Specifications 18 ni.com
Settling time (to 2 LSBs)
NI 9215E with screw terminal
10 V step .............................. 10 μs
20 V step .............................. 15 μs
NI 9215E with BNC
10 V step .............................. 25 μs
20 V step .............................. 35 μs
No missing codes.............................. 15 bits guaranteed
DNL .................................................. –1.9 to 2 LSB max
INL.................................................... ±6 LSB max
MTBF ............................................... 1,167,174 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.

© National Instruments Corp. 19 NI 9215E Operating Instructions and Specifications
Power Requirements
Power consumption from chassis (full-scale input, 100 kS/s)
Active mode ............................... 560 mW max
Sleep mode ................................. 25 μW max
Thermal dissipation (at 85 °C)
Active mode ............................... 560 mW max
Sleep mode ................................. 25 μW max
Physical Characteristics
Use a dry, low-velocity stream of air to clean the module. If
needed, use a soft-bristle brush for cleaning around components.
Note For two-dimensional drawings and
three-dimensional models of the C Series module and
connectors, visit ni.com/dimensions and search by
module number.
Screw-terminal wiring ...................... 12 to 24 AWG copper
conductor wire with 10 mm
(0.39 in.) of insulation
stripped from the end

NI 9215E Operating Instructions and Specifications 20 ni.com
Torque for screw terminals ............... 0.5 to 0.6 N · m
(4.4 to 5.3 lb · in.)
Ferrules ............................................. 0.25 mm2to 2.5 mm2
Weight
NI 9215E with screw terminal.... 65 g (2.3 oz)
NI 9215E with BNC................... 71 g (2.5 oz)
Safety
NI 9215E with Screw Terminal Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM .............................. ± 30 V max
Isolation
Channel-to-channel .................... None
Channel-to-earth ground
Continuous ........................... 250 Vrms,
Measurement Category II,
(Double Insulation)
Withstand ............................. 2,300 Vrms, verified by a
5 s dielectric withstand test