National Instruments 5411 - Manual (Page 19)

Chapter 3 Signal Connections
DAQArb 5411 User Manual 3-2 © National Instruments Corporation
ARB Connector
The ARB connector provides the waveform output. The maximum
output levels on this connector depend on the type of load termination.
If the output of a DAQArb 5411 terminates into a 50
Ω
load, the output
levels are ±5 V, as shown in Figure 3-2. If the output of DAQArb 5411
terminates into a high impedance load (HiZ), the output levels are
±10 V. If the output terminates into any other load, the levels are:
where V
out
is the maximum output voltage level, R
L
is the load
impedance in ohms, and R
O
is the output impedance on the
DAQArb 5411. By default, R
O
= 50
Ω
, but the software can also set it
to 75
Ω
.
Note: Software will set the voltage output levels based on a 50
Ω
load termination.
For more information on waveform generation and analog output
operation, refer to Chapter 4, Arb Operation. For specifications on the
waveform output signal, see Appendix A, Specifications.
Figure 3-2. Output Levels and Load Termination Using a 50 Ω Output Impedance
V
out
=
±
x 10 V
R
L
R
L
+ R
O
ARB
DAQArb 5411
Load
±
5 V R
L
=
50 Ω
ARB
DAQArb 5411
Load
± 10 V
R
L
=
HiZ
50
Ω
Load
High Impedance Load
R
O
=
50
R
O
=
50
Ω
Ω