NI 446x Specifications
This document lists specifications for the NI PCI/PXI-4461 and NI PCI/PXI-4462 (NI446x) Dynamic Signal Acquisition (DSA) devices. The specifications are typical at 25°C unless otherwi stated. The operating range for the PXI-446x is
0to55°C, and the operating range for the PCI-446x is 0 to 50°C. All accuracies listed are valid for up to one year from the time of the device external calibration. All specifications are subject to change without notice. /manuals for the most current specifications and product documentation.
Caution The inputs of this nsitive test and measurement product are not protected for electromagnetic interference for functional reasons. As a result, this product may experience reduced measurement accuracy or other temporary performance degradation when cables are attached in an environment with electromagnetic interference prent. Refer to the Declaration of Conformity (DoC) for this product for details of the standards applied to asss electromagnetic compatibility performance. To obtain the DoC, /certification, arch by model number or product line, and click the appropriate link in the Certification column.
Analog Input
This ction lists the NI446x analog input (AI) specifications.
Input Characteristics
Number of simultaneously sampled input channels NI4461 (2)
NI4462 (4)
Differential or
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pudodifferential (50Ωants
between negative input
and chassis ground), each
channel independently
software lectable AC or DC, each channel
independently software
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lectable
A/D converter (ADC) 24 bits Delta-sigma
Sample rates (f s),
samples-per-cond (S/s).................1kS/s to 204.8kS/s in
181.9μS/s increments,
maximum
ADC modulator oversample rate
1.0kS/s≤f s≤51.128f s
51.2kS/s<f s≤102.64 f s
102.4kS/s<f s≤204.32 f s
Sample Clock Timeba Rate
Ratio between sample rate (f s) and sample clock timeba rate
FIFO .2,047 samples
Direct memory access
(DMA)
Input Common Mode Range Input Overvoltage Protection ±42.4V pk
Pudodifferential configuration
±42.4V pk Negative terminal (shield)..........±10.0V pk
Input Signal Range
Transfer Characteristics
AI Offt (Residual DC)
Sample Rate (f s)
Sample Clock Timeba Rate Low-
Frequency
Alias Rejection
Enabled
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(Default)
Low-
Frequency
Alias
Rejection
Disabled
1.0kS/s≤f s≤1.6kS/s16,384f s512f s 1.6kS/s<f s≤3.2kS/s8,192f s
3.2kS/s<f s≤6.4kS/s4,096f s
6.4kS/s<f s≤12.8kS/s2,048f s
12.8kS/s<f s≤25.6kS/s1,024f s
25.6kS/s<f s≤51.2kS/s512f s
51.2kS/s<f s≤102.4kS/s256f s256f s 102.4kS/s<f s≤204.8kS/s128f s128f s
Gain
大雁会游泳吗(dB)Input Differential*Pudodifferential*≥0+±12V pk±12V pk
–±12V pk±10V pk
<0+±42.4V pk±42.4V pk
–±42.4V pk±10V pk
* Voltages with respect to chassis ground
Gain (dB)Full-Scale Range (V pk)* 30±0.316
20±1.00
10±3.16
0±10.0
–10±31.6
–20±42.4
* Each input channel gain is independently software lectable.
Gain
(dB)
DC-Coupled
Offt*, †, Max,
T cal‡ ±5°C
(±mV)
DC-Coupled Offt*,
Max, Over Operating
Temperature Range
(±mV) 300.11
200.22
100.53
00.77
–10530
–20770
* Source impedance≤50Ω.
† Listed offt is valid 24 hours following a lf calibration.‡ T cal=ambient temperature at which last lf calibration was performed.
NI
© National Instruments Corporation 3NI 446x Specifications
AI Gain Amplitude Accuracy
1kHz input tone
T cal ±5 °C....................................±0.03dB max
(T cal =ambient temperature at which last lf calibration was performed.)
(Listed accuracy is valid 24 hours following a lf calibration.)
Over operating
.±0.2dB max
Amplifier Characteristics
Input Impedance
Common-Mode Rejection Ratio (CMRR)
Dynamic Characteristics 1
AC coupling
–3dB 3.4Hz –0.1dB 22.6Hz
Input Impedance Differential Configuration Pudodifferential Configuration Between positive input and chassis ground Between
negative input and chassis ground
50Ω
1 M Ω217 pF
|| 1 M Ω217 pF
||1 M Ω229 pF
||Gain (dB)
DC-Coupled CMRR (dBc)*, †
AC-Coupled CMRR (dBc)†, ‡
3010570
201011090080–20, –10
60
65
* ≤
1kHz
† Differential configuration ‡ 50 or 60
Hz
1 Test system equipped with a liquid crystal display (LCD) monitor for AI noi and distortion measurements to avoid possible
magnetic interference caud by cathode ray tube (CRT)-bad monitors.
Specification Low-Frequency Alias Rejection
Enabled (Default)Low-Frequency Alias Rejection Disabled Alias-free bandwidth (BW) (passband)DC to 0.4 f s DC to 0.4535 f s Alias rejection, minimum 104dBc
120dBc
Alias rejection by frequency
Input frequency >0.6f s
0.5465f s <input frequency <127.4535f s ,where 1.0kS/s ≤f s ≤51.2kS/s 0.5465f s <input frequency <63.4535f s ,where 51.2kS/s <f s ≤102.4kS/s 0.5465f s <input frequency <31.4535f s ,where 102.4kS/s <f s ≤204.8kS/s
–3dB BW 0.484f s
0.491f s
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Figure 1. Magnitude Respon of AC Coupling Circuit (1Hz to 1kHz)
Figure 2. Pha Respon of AC Coupling Circuit (1Hz to 1kHz)
NI
© National Instruments Corporation 5NI 446x Specifications
ADC Filter Delay
AI Flatness
Low-Frequency Alias Rejection Enabled (Default)
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Low-Frequency Alias Rejection Disabled Sample Rate (kS/s)Filter Delay (Samples)Sample Rate (kS/s)Filter Delay (Samples)
1.0≤f s ≤1.63
2.96875 1.0≤f s ≤1.663
1.6<f s ≤3.233.9375 1.6<f s ≤3.23.2<f s ≤6.435.875 3.2<f s ≤6.46.4<f s ≤1
2.839.75 6.4<f s ≤12.812.8<f s ≤25.647.512.8<f s ≤25.625.6<f s ≤204.8
63
25.6<f s ≤204.8
马尾巴的作用
Gain (dB)DC-Coupled Flatness * (dB),
Max (Typical)
20Hz to 20kHz 20Hz to 45kHz 20Hz to 92.2kHz 0, 10, 20, 30±0.006 (±0.003)±0.03 (±0.02)±0.1 (±0.08)–20, –10
±0.2 (±0.1)±0.6 (±0.33)
±1 (±0.55)
* Relative to 1
kHz
