NATIONAL INSTRUMENTS NI SMB-2145 Source Measure Unit
Shielded Signal Accessories for NI 5751/5752 Adapter Modules
The NI SMB-2145/2146/2147/2148 (NI SMB-214x) devices are shielded signal accessories for NI FlexRIO™ digitizer adapter modules (NI 5751 and NI 5752). NI SMB-214x accessories provide easy connections to other devices for testing and debugging. The following table describes each of the accessories.
Table 1. NI 214x Signal Accessories
| Accessory | Description |
| NI SMB-2145 | NI 5752 analog input accessory |
| NI SMB-2146 | NI 5752 digital I/O accessory |
| NI SMB-2147 | NI 5751 analog input accessory |
| NI SMB-2148 | NI 5751 digital I/O accessory |
This guide explains how to set up and use NI SMB-214x signal accessories with NI 5751/5752 adapter modules.
Conventions
The following conventions are used in this manual:
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What You Need to Get Started
To set up and use the NI SMB-214x, you need the following items:
- NI 5751R or NI 5752R, installed in a PXI/PXI Express or CompactPCI chassis
Note The NI 5751R and NI 5752R are comprised of an NI FlexRIO FPGA module and an NI FlexRIO adapter module (NI 5751 or NI 5752).
The appropriate cable assembly for your adapter module:
Table 2. NI SMB-214x Cables
| Adapter Module/Signal | Cable Description | Part Number |
| NI 5751 Analog | SHC68-C68-D4 | 196275A-01 |
| NI 5751 Digital | SHC68-C68-D4 | 196275A-01 |
| NI 5752 Analog | SHC68-C68-D3 | 188143B-01 |
| NI 5752 Digital | SHC68-C68-D4 | 196275A-01 |
At least one 50 Ω cable with SMB connectors
You may find the following documents helpful as you use the NI SMB-214x.
- NI 5751R User Guide and Specifications
- NI 5752R User Guide and Specifications
- NI FlexRIO FPGA Module Installation Guide and Specifications
These printed documents provide the specifications for your adapter module and your FPGA module. These documents are also available at ni.com/manuals.
Parts Locator
Figures 1-4 show the connectors on each of the NI SMB-214x accessories.
Installing Cables
Caution Disconnect power from the adapter module, accessory, and any other connected hardware before connecting the cable to prevent personal injury or damage to the hardware. NI is not liable for damage resulting from improper connections.
Complete the following steps to install the cable and any 50 Ω SMB cables.
- Install the NI 5751R or NI 5752R by following the installation procedure described in the NI FlexRIO FPGA Module Installation Guide and Specifications.
- Remove power from the adapter module by powering down the PXI/PXI Express or CompactPCI chassis or by programmatically removing power from the adapter module. Power down any external hardware intended for connection to this system.
- Attach either end of the cable assembly to the VHDCI connector on the front panel of the adapter module and secure the cable with the captive screws on the cable connector.
Note Do not use cables other than the cables listed in Table 2 with these accessories. - Attach and secure the other end of the cable assembly to the VHDCI connector of the NI SMB-214x and secure them together with the captive screws on the cable connector.
Figures 5 and 6 show how to connect your NI SMB-214x accessory to your NI FlexRIO system.
- 1 PXI Chassis with NI 5752R
- NI SMB-2145
- NI SMB-2146
- SHC68-C68-D4 Cable Assembly
- SHC68-C68-D3 Cable Assembly
Figure 5. Connecting the NI 5752R to the NI SMB-2145 and NI SMB-2146
- PXI Chassis with NI 5751R
- NI SMB-2147
- NI SMB-2148
- SHC68-C68-D4 Cable Assemblies
Figure 6. Connecting the NI 5751R to the NI SMB-2147 and NI SMB-2148 - Make signal connections by connecting SMB cables to NI SMB-214x signal terminals. Refer to the Connecting Signals section for more information.
Note To ensure a solid ground connection, tighten the SMB connectors by gently snapping them into place. - Apply power to the adapter module by powering on the PXI/PXIe or Compact PCI chassis or by programmatically applying power to the adapter module.
- Power on any external hardware intended for use with this system.
Connecting Signals
- The NI SMB-214x provides signal connectivity to the NI 5751/5752 adapter module. You can connect to these signals from the labeled SMB connectors on the NI SMB-214x.
- Caution Connections that exceed any of the maximum ratings for the NI SMB-214x or the NI 5751/5752 adapter module can damage the device and the computer. Maximum input ratings are provided in the specifications document that shipped with the adapter module. NI is not liable for any damages resulting from such signal connections.
- Figures 7 through 10 show the pinouts of the VHDCI connectors of NI SMB-214x accessories. The analog inputs, digital inputs, and digital outputs are connected to corresponding pins on the NI SMB-214x. Refer to Table 3 for the pin descriptions.
Table 3. VHDCI Connector Pinout Descriptions
| Pin | Signal Description |
| AI <0..31> | Analog input channels 0 through 31 |
| DI <0..15> | Digital input channels 0 through 15 |
| DO <0..15> | Digital output channels 0 through 15 |
| GND | Ground reference for signals |
| RSVD | Reserved for system use. Do not connect signals to these channels. |
NI SMB-2145
NI SMB-2146
NI SMB-2147
NI SMB-2148
Note For additional shielding, you can connect the shield ground connector on the NI SMB-214x to earth/hard ground. This terminal is connected to the shielded enclosure ground. The shield ground lug is shown in Figures 1 through 4.
Cleaning the Accessory
Disconnect all cables to the NI SMB-214x before cleaning. To remove light dust, use a soft, nonmetallic brush. To remove other contaminants, use alcohol wipes. The unit must be completely dry and free from contaminants before returning to service.
Specifications
These specifications are characteristic at 25 °C unless otherwise noted.
NI SMB-2145
Analog Input
- Analog input channels………………………. 16, single-ended
- Typical propagation delay through NI SMB-2145 ……………………… 1.2 ns
- Typical channel-to-channel skew……….. ±35 ps
- Typical trace characteristic impedance …………………… 50
- Maximum voltage rating…………………… 5.5 V or the maximum input voltage of the NI 5752 analog inputs, whichever is less
Physical
- Dimensions……………………………………… 30.5 cm × 4.5 cm × 26.5 cm (12.0 in. × 1.77 in. × 10.43 in.)
- Weight ……………………………………………. 1,380 g (48.7 oz.)
- I/O connectors ………………………………….One 68-pin VHDCI connector, 16 SMB jack connectors, one banana-style connector
NI SMB-2146
Digital I/O
- Digital output channels ………………………16, single-ended
- Digital input channels ………………………..2, single-ended
- Typical propagation delay through NI SMB-2146……………………….1.2 ns
- Typical channel-to-channel skew………..±35 ps
- Typical trace characteristic impedance…………………….50
- Maximum voltage rating ……………………5.5 V or the maximum input voltage of the NI 5752 digital inputs, whichever is less
Physical
- Dimensions ………………………………………30.5 cm × 4.5 cm × 26.5 cm (12.0 in. × 1.77 in. × 10.43 in.)
- Weight …………………………………………….1,380 g (48.7 oz.)
- I/O connectors…………………………………..One 68-pin VHDCI connector, 18 SMB jack connectors, one banana-style connector
NI SMB-2147
Analog Input
- Analog input channels ……………………….16, single-ended
- Typical propagation delay through NI SMB-2147……………………….1.2 ns
- Typical channel-to-channel skew………..±35 ps
- Typical trace characteristic impedance…………………….50
- Maximum voltage rating ……………………5.5 V or the maximum input voltage of the NI 5751 analog inputs, whichever is less
Physical
- Dimensions……………………………………… 30.5 cm × 4.5 cm × 26.5 cm (12.0 in. × 1.77 in. × 10.43 in.)
- Weight ……………………………………………. 1,380 g (48.7 oz.)
- I/O connectors ………………………………….One 68-pin VHDCI connector, 16 SMB jack connectors, one banana-style connector
NI SMB-2148
Digital I/O
- Digital input channels ………………………. 8, single-ended
- Digital output channels …………………….. 8, single-ended
- Typical propagation delay through NI SMB-2148 ……………………… 1.2 ns
- Typical channel-to-channel skew……….. ±35 ps
- Typical trace characteristic impedance …………………… 50
- Maximum voltage rating…………………… 5.5 V or the maximum input voltage of the NI 5751 digital inputs, whichever is less
Physical
- Dimensions……………………………………… 30.5 cm × 4.5 cm × 26.5 cm (12.0 in. × 1.77 in. × 10.43 in.)
- Weight ……………………………………………. 1,380 g (48.7 oz.)
- I/O connectors ………………………………….One 68-pin VHDCI connector, 16 SMB jack connectors, one banana-style connector
Compliance and Certifications
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Documents / Resources
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