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INSTALLATION GUIDE
SCXI -1305 AC/DC Coupling
™
BNC Terminal Block
The SCXI-1305 limits the maximum common-mode voltage of the
Caution
SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 to 42 V
level may cause injury. National Instruments is not liable for damage or injuries resulting
from improper connection.
What You Need to Get Started
This guide describes how to install and use the SCXI-1305 AC/DC
coupling BNC terminal block.
The SCXI-1305 is a shielded terminal block with BNC and SMB
connectors that you can connect to the SCXI-1120/D, SCXI-1121,
SCXI-1125, SCXI-1126, SCXI-1140, or SCXI-1141/1142/1143 input
connectors. You can configure each SCXI-1305 channel to AC- or
DC-couple a signal to an SCXI module. Each channel can
ground-reference a floating signal with a bias resistor.
The terminal block has eight BNC and one SMB connector for easy
connection. The eight BNCs are for signal connections to the eight module
inputs. The SMB provides access to module digital signals, HOLDTRIG
for the SCXI-1140, and OUTCLK and EXTCLK for the
SCXI-1141/1142/1143. These signals are not active on the SCXI-1120/D,
SCXI-1121, SCXI-1125, and SCXI-1126.
To set up and use the SCXI-1305 terminal block, you need the following:
❑
Hardware
–
SCXI-1305 terminal block
–
SCXI or PXI/SCXI combination chassis
or DC. Exceeding this
pk
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Table of Contents
Related Manuals for National Instruments SCXI -1305
Summary of Contents for National Instruments SCXI -1305
- Page 1 Caution SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 to 42 V or DC. Exceeding this level may cause injury. National Instruments is not liable for damage or injuries resulting from improper connection. What You Need to Get Started To set up and use the SCXI-1305 terminal block, you need the following: ❑...
- Page 2 – One of the following modules: • SCXI-1120/D • SCXI-1121 • SCXI-1125 • SCXI-1126 • SCXI-1140 • SCXI-1141/1142/1143 – BNC cable – SMB cable if using an SCXI-1140 or SCXI-1141/1142/1143 ❑ Tools – Number 1 and 2 Phillips-head screwdrivers – 1/8 in.
-
Page 3: Configuring Floating Or Ground-Referenced Signals
Reference an input signal to ground at only one point. Do not reference the input of a differential amplifier module to ground if the signal source is already ground-referenced. If you are measuring a floating source, reference the input to ground. © National Instruments Corporation SCXI-1305 Installation Guide... - Page 4 To ground-reference a floating signal for each channel, use the switch settings shown in Table 1. Each channel has one switch with two positions as follows: • Use the F position with floating signal sources. Setting one of these switches to the F position connects a 100 kΩ resistor between the negative input for the channel and analog ground.
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Page 5: Configuring The Channels For Ac Or Dc Coupling
For the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126, there is an effective 2 MΩ resistor instead of two 1 MΩ resistors. This 2 MΩ resistor is referenced to the negative input of the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 instead of ground to maintain the SCXI-1120/D, SCXI-1121, SCXI-1125, and SCXI-1126 isolation. © National Instruments Corporation SCXI-1305 Installation Guide... -
Page 6: Configuring The Clock
Configuring the Clock Due to space limitations, a jumper, W1, inside the terminal block is used to select the clock that goes to the SMB connector. Figure 2 shows the location of jumper W1. Refer to the SCXI-1140 User Manual or SCXI-1141/1142/1143 User Manual for the use of these clocks. - Page 7 1 Rear Connector 2 Thumbscrew 3 Top Cover Screws 4 Top Cover Figure 1. SCXI-1305 Parts Locator Diagram © National Instruments Corporation SCXI-1305 Installation Guide...
- Page 8 HOLD/CLK 1 Jumper W1 9 Channel 7 Switches 2 Channel 0 Switches 10 Serial Number 3 Channel 1 Switches 11 AC/DC Coupling Switches 4 Channel 2 Switches 12 Floating/Ground Reference Switches 5 Channel 3 Switches 13 SCXI-1121 Signal Connections 6 Channel 4 Switches 14 SCXI-1120/D, 1125, 1126, 1140, 7 Channel 5 Switches 1141/1142/1143 Signal Connections...
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Page 9: Circuit Diagram
SCXI-1120/D ........8 input channels SCXI-1121 ........4 input channels, 4 excitation output channels SCXI-1125 ........8 input channels SCXI-1126 ........8 input channels The excitation output channels must be configured for DC coupling. © National Instruments Corporation SCXI-1305 Installation Guide... - Page 10 SCXI-1140........8 input channels, one external clock signal SCXI-1141/1142/1143 ....8 input channels, two clock signals Coupling ..........DC or AC (selectable on a per-channel basis using slide switches) AC coupling circuitry Corner frequency (–3 dB)....0.16 Hz DC-rejection capacity......±42 VDC Input impedance (minimum) Between CH+ and CH–...
- Page 11 Environment Operating temperature......0 to 50 °C Storage temperature ....... –20 to 70 °C Humidity ..........10 to 90% RH, noncondensing Maximum altitude ........2,000 meters Pollution Degree (indoor use only) ..2 © National Instruments Corporation SCXI-1305 Installation Guide...
- Page 12 Certification column. Environmental Management National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the environment but also to NI customers.
- Page 13 Waste Electrical and Electronic Equipment (WEEE) At the end of their life cycle, all products must be sent to a WEEE recycling EU Customers center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit ni.com/environment/weee.htm RoHS...
- Page 14 Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or ni.com/patents.
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