National Instruments TBX-1316 Installation Manual

INSTALLATION GUIDE
TBX-1316 High-Voltage
Attenuator Terminal Block
Caution Do not use the TBX-1316 to connect to signals above 600 V Category II. Do not
use the TBX-1316 in Category III or IV applications. Do not connect to MAINS supply
circuits above 600 VAC.
Note Refer to the Read Me First: Safety and Radio-Interference document for definitions
of Categories and other safety information.
Caution Do not use uninsulated input signal wires. All input signal wires must be
separated from each other and must have a minimum voltage rating of 1000 V for
Category I or 600 V for Category II and have a temperature rating of 90 °C.
This guide describes how to install and use the TBX-1316 high-voltage
attenuator terminal block with the following modules:
• SCXI-1125 (recommended)
• SCXI-1126
• SCXI-1120/D
The TBX-1316 is a shielded metal enclosure with a built-in high-voltage
attenuator. You can use it to measure high-voltage signals of up to 1000 V
Category I and 600 V Category II.
The TBX-1316 has eight differential high-voltage input channels. Each
high-voltage input channel has three screw terminals—one each for input
plus, input minus, and chassis ground. For maximum safety, all the
chassis-ground terminals and the enclosure are connected. You can use
6 to 20 AWG signal wire in the screw terminals. Use an SH3232 shielded
cable to connect the TBX-1316 to the module.
Each input channel is formed by a pair of 200:1 fixed-attenuation-ratio
high-voltage resistor networks. The nominal inaccuracy of the attenuation
factor is < 1%, and the attenuation-ratio drift temperature coefficient is
< 20 ppm/°C.