PXIe-6341 Specifications

These specifications apply to the PXIe-6341.

Revision History

Version	Date changed	Description
377881C-01	November 2025	Added signal information and updated the AI Accuracy description.
377881B-01	April 2025	Added the product pinout.
377881A-01	February 2019	Initial release (PXIe-6341 only).
370786D-01	January 2013	Original specifications document: NI 6341/6343 Specifications

Looking For Something Else?

For information not found in the specifications for your product, such as operating instructions, browse Related Information.

Definitions

Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.

Characteristics describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.

Typical specifications describe the performance met by a majority of models.
Nominal describes an attribute that is based on design, conformance testing, or supplemental testing.

Specifications are Typical unless otherwise noted.

Conditions

Specifications are valid at 25 °C unless otherwise noted.

PXIe-6341 Pinout

Use the pinout to connect to terminals on the PXIe-6341.

Table 1. Default Counter/Timer Terminals
Counter/Timer Signal	Default PFI Terminal
CTR 0 SRC	PFI 8
CTR 0 GATE	PFI 9
CTR 0 AUX	PFI 10
CTR 0 OUT	PFI 12
CTR 0 A	PFI 8
CTR 0 Z	PFI 9
CTR 0 B	PFI 10
CTR 1 SRC	PFI 3
CTR 1 GATE	PFI 4
CTR 1 AUX	PFI 11
CTR 1 OUT	PFI 13
CTR 1 A	PFI 3
CTR 1 Z	PFI 4
CTR 1 B	PFI 11
CTR 2 SRC	PFI 0
CTR 2 GATE	PFI 1
CTR 2 AUX	PFI 2
CTR 2 OUT	PFI 14
CTR 2 A	PFI 0
CTR 2 Z	PFI 1
CTR 2 B	PFI 2
CTR 3 SRC	PFI 5
CTR 3 GATE	PFI 6
CTR 3 AUX	PFI 7
CTR 3 OUT	PFI 15
CTR 3 A	PFI 5
CTR 3 Z	PFI 6
CTR 3 B	PFI 7
FREQ OUT	PFI 14

Table 2. Signal Descriptions
Signal	Reference	Description
AI GND	—	Analog input ground—These terminals are the reference point for single-ended AI measurements in RSE mode and the bias current return point for DIFF measurements.
AI <0..15>	Varies	Analog input channels—For single-ended measurements, each signal is an analog input voltage channel. In RSE mode, AI GND is the reference for these signals. In NRSE mode, the reference for each AI signal is an AI SENSE. For differential measurements, AI 0 and AI 8 are the positive and negative inputs of differential analog input channel 0. Similarly, the following signal pairs also form differential input channels: AI <1,9>, AI <2,10>, and so on.
AI SENSE	—	Analog input Sense—In NRSE mode, the reference for each AI <0..15> signal is AI SENSE.
AO <0,1>	AO GND	Analog output channels—These terminals supply voltage output.
AO GND	—	Analog output ground—AO GND is the reference for AO <0,1>.
D GND	—	Digital ground—D GND supplies the reference for port 0, port 1, port 2 digital channels, PFI, and +5 V.
P0.<0..7>	D GND	Port 0 digital I/O channels—You can configure each signal individually as an input or output.
+5 V	D GND	+5 V power source—These terminals provide a fused +5 V power source.
PFI <0..7>/P1.<0..7> PFI <8..15>/P2.<0..7>	D GND	Programmable Function Interface or digital I/O channels—Each of these terminals can be individually configured as a PFI terminal or a digital I/O terminal. As an input, each PFI terminal can supply an external source for AI, AO, DI, and DO timing signals or counter/timer inputs. As a PFI output, you can route many different internal AI, AO, DI, or DO timing signals to each PFI terminal. You can also route the counter/timer outputs to each PFI terminal. As a port 1 or port 2 digital I/O signal, you can individually configure each signal as an input or output.

Note To reduce crosstalk between subsystems, all ground references—AI GND, AO GND, and D GND—are connected on the device by small traces. Each ground has a slight difference in potential.

Analog Input

Table 3. Analog Input
Number of channels	16 single ended or 8 differential
ADC resolution	16 bits
DNL	No missing codes guaranteed
INL	Refer to AI Absolute Accuracy.
Input coupling	DC
Input range	±0.2 V, ±1 V, ±5 V, ±10 V
Maximum working voltage for analog inputs (signal + common mode)	±11 V of AI GND
CMRR (DC to 60 Hz)	100 dB
Input bias current	±100 pA
Small signal bandwidth (-3 dB)	1.2 MHz
Input FIFO size	2,047 samples
Scan list memory	4,095 entries
Data transfers	DMA (scatter-gather), programmed I/O

Table 4. AI Sample Rate
Single channel maximum	500 kS/s (kilosamples per second)
Multichannel maximum (aggregate)	500 kS/s
Minimum	No minimum

Table 5. AI Timing
Timing resolution	10 ns
Timing accuracy	50 ppm of sample rate

Table 6. AI Input Impedance
Device on, AI+ to AI GND	>10 GΩ in parallel with 100 pF
Device on, AI- to AI GND	>10 GΩ in parallel with 100 pF
Device off, AI+ to AI GND	1,200 Ω
Device off, AI- to AI GND	1,200 Ω

Table 7. AI Crosstalk (at 100 kHz)
Adjacent channels	-75 dB
Non-adjacent channels	-90 dB

Table 8. AI Overvoltage Protection for All Analog Input and Sense Channels
Device on	±25 V for up to two AI pins
Device off	±15 V for up to two AI pins

Table 9. AI Input Current During Overvoltage Condition
Input current during overvoltage condition	±20 mA maximum/AI pin

Settling Time for Multichannel Measurements

Table 10. Settling Time for Multichannel Measurements, Accuracy, Full-Scale Step, All Ranges
±90 ppm of step (±6 LSB)	2 μs convert interval
±30 ppm of step (±2 LSB)	3 μs convert interval
±15 ppm of step (±1 LSB)	5 μs convert interval

Typical Performance Graph

Figure 2. Settling Error versus Time for Different Source Impedances

AI Absolute Accuracy

Table 11. AI Absolute Accuracy
Nominal Range Positive Full Scale (V)	Nominal Range Negative Full Scale (V)	Residual Gain Error (ppm of Reading)	Residual Offset Error (ppm of Range)	Offset Tempco (ppm of Range/°C)	Random Noise, σ (μVrms)	Absolute Accuracy at Full Scale (μV)
10	-10	65	13	23	270	2,190
5	-5	72	13	23	135	1,130
1	-1	78	17	26	28	240
0.2	-0.2	105	27	39	9	60

Note Absolute accuracy at full scale on the analog input channels is determined using the following assumptions:

TempChangeFromLastExternalCal = 10 °C
TempChangeFromLastInternalCal = 1 °C
number_of_readings = 10,000
CoverageFactor = 3 σ

For more information about absolute accuracy at full scale, refer to the AI Absolute Accuracy Example section below.

Note Accuracies listed are valid for up to two years from the device external calibration.

Table 12. AI Absolute Accuracy Values
Gain tempco	7.3 ppm/°C
Reference tempco	5 ppm/°C
INL error	60 ppm of range

AI Absolute Accuracy Equation

AbsoluteAccuracy = Reading · (GainError) + Range · (OffsetError) + NoiseUncertainity

GainError = ResidualGainError + GainTempco · (TempChangeFromLastInternalCal) + ReferenceTempco · (TempChangeFromLastExternalCal)
OffsetError = ResidualOffsetError + OffsetTempco · (TempChangeFromLastInternalCal) + INLError
NoiseUncertainty =
$\frac{Random Noise \cdot 3}{\sqrt{10, 000}}$
for a coverage factor of 3 σ and averaging 10,000 points.

AI Absolute Accuracy Example

For example, on the 10 V range, the absolute accuracy at full scale is as follows:

GainError: 65 ppm + 7.3 ppm · 1 + 5 ppm · 10 = 122 ppm
OffsetError: 13 ppm + 23 ppm · 1 + 60 ppm = 96 ppm
NoiseUncertainty:
$\frac{270 µ V \cdot 3}{\sqrt{10, 000}}$
= 8.1 μV
AbsoluteAccuracy: 10 V · (GainError) + 10 V · (OffsetError) + NoiseUncertainty = 2,190 μV

Analog Output

Table 13. Analog Output
Number of channels	2
DAC resolution	16 bits
DNL	±1 LSB
Monotonicity	16 bit guaranteed
Output range	±10 V
Output coupling	DC
Output impedance	0.2 Ω
Output current drive	±5 mA
Output FIFO size	8,191 samples shared among channels used
Data transfers	DMA (scatter-gather), programmed I/O

Table 14. AO Maximum Update Rate (Simultaneous)
1 channel	900 kS/s (kilosamples per second)
2 channels	840 kS/s

Table 15. AO Timing
Timing accuracy	50 ppm of sample rate
Timing resolution	10 ns

Table 16. AO Protection
Overdrive protection	±15 V
Overdrive current	15 mA

Table 17. AO Power-On
Power-on state	±20 mV
Power-on/off glitch	2 V for 500 ms

Table 18. AO Waveform Modes and Settling Time
AO waveform modes	Non-periodic waveform, periodic waveform regeneration mode from onboard FIFO, periodic waveform regeneration from host buffer including dynamic update
Settling time, full-scale step, 15 ppm (1 LSB)	6 µs
Slew rate	15 V/μs

Table 19. AO Glitch Energy
Magnitude	100 mV
Duration	2.6 μs

AO Absolute Accuracy

Table 20. AO Absolute Accuracy
Nominal Range Positive Full Scale (V)	Nominal Range Negative Full Scale (V)	Residual Gain Error (ppm of Reading)	Gain Tempco (ppm/°C)	Reference Tempco (ppm/°C)	Residual Offset Error (ppm of Range)	Offset Tempco (ppm of Range/°C)	INL Error (ppm of Range)	Absolute Accuracy at Full Scale (μV)
10	-10	80	11.3	5	53	4.8	128	3,271

Note Absolute Accuracy at Full Scale numbers are valid immediately following self calibration and assumes the device is operating within 10 °C of the last external calibration.

Note Accuracies listed are valid for up to two years from the device external calibration.

AO Absolute Accuracy Equation

AbsoluteAccuracy = OutputValue · (GainError) + Range · (OffsetError)

GainError = ResidualGainError + GainTempco · (TempChangeFromLastInternalCal) + ReferenceTempco · (TempChangeFromLastExternalCal)
OffsetError = ResidualOffsetError + OffsetTempco · (TempChangeFromLastInternalCal) + INLError

Digital I/O/PFI

Static Characteristics

Table 21. Static DIO/PFI Characteristics
Number of channels	24 total, 8 (P0.<0..7>), 16 (PFI <0..7>/P1, PFI <8..15>/P2)
Ground reference	D GND
Direction control	Each terminal individually programmable as input or output
Pull-down resistor	50 kΩ typical, 20 kΩ minimum
Input voltage protection	±20 V on up to two pins

Caution Stresses beyond those listed under the Input voltage protection specification may cause permanent damage to the device.

Waveform Characteristics (Port 0 Only)

Table 22. Waveform Characteristics (Port 0 Only)
Terminals used	Port 0 (P0.<0..7>)
Port/sample size	Up to 8 bits
Waveform generation (DO) FIFO	2,047 samples
Waveform acquisition (DI) FIFO	255 samples
DO or DI sample clock frequency	0 to 1 MHz, system and bus activity dependent
Data transfers	DMA (scatter-gather), programmed I/O
Digital line filter settings	160 ns, 10.24 μs, 5.12 ms, disable

PFI/Port 1/Port 2 Functionality

Table 23. PFI/Port 1/Port 2 Functionality
Functionality	Static digital input, static digital output, timing input, timing output
Timing output sources	Many AI, AO, counter, DI, DO timing signals
Debounce filter settings	90 ns, 5.12 µs, 2.56 ms, custom interval, disable; programmable high and low transitions; selectable per input

Recommended Operating Conditions

Table 24. Recommended Operating Conditions
Level	Minimum	Maximum
Input high voltage (V_IH)	2.2 V	5.25 V
Input low voltage (V_IL)	0 V	0.8 V
Output high current (I_OH) P0.<0..7>	—	-24 mA
Output high current (I_OH) PFI <0..15>/P1/P2	—	-16 mA
Output low current (I_OL) P0.<0..7>	—	24 mA
Output low current (I_OL) PFI <0..15>/P1/P2	—	16 mA

Digital I/O Characteristics

Table 25. Digital I/O Characteristics
Positive-going threshold (VT+)	2.2 V maximum
Negative-going threshold (VT-)	0.8 V minimum
Delta VT hysteresis (VT+ - VT-)	0.2 V minimum
I_IL input low current (V_IN = 0 V)	-10 μA maximum
I_IH input high current (V_IN = 5 V)	250 μA maximum

P0.<0..7>: I[OH] versus V[OH] Plot — Figure 3. P0.<0..7>: I_OH versus V_OH

P0.<0..7>: I[OL] versus V[OL] Plot — Figure 4. P0.<0..7>: I_OL versus V_OL

PFI <0..15>/P1/P2: I[OH] versus V[OH] Plot — Figure 5. PFI <0..15>/P1/P2: I_OH versus V_OH

PFI <0..15>/P1/P2: I[OL] versus V[OL] Plot — Figure 6. PFI <0..15>/P1/P2: I_OL versus V_OL

General-Purpose Counters

Table 26. General-Purpose Counters
Number of counter/timers	4
Resolution	32 bits
Counter measurements	Edge counting, pulse, pulse width, semi-period, period, two-edge separation
Position measurements	X1, X2, X4 quadrature encoding with Channel Z reloading; two-pulse encoding
Output applications	Pulse, pulse train with dynamic updates, frequency division, equivalent time sampling
Internal base clocks	100 MHz, 20 MHz, 100 kHz
External base clock frequency	0 MHz to 25 MHz 0 MHz to 100 MHz on PXIe_DSTAR<A,B>
Base clock accuracy	50 ppm
Inputs	Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down, Sample Clock
Routing options for inputs	Any PFI, PXIe_DSTAR<A,B>, PXI_TRIG, PXI_STAR, many internal signals
FIFO	127 samples per counter
Data transfers	Dedicated scatter-gather DMA controller for each counter/timer, programmed I/O

Frequency Generator

Table 27. Frequency Generator
Number of channels	1
Base clocks	20 MHz, 10 MHz, 100 kHz
Divisors	1 to 16
Base clock accuracy	50 ppm

Output can be available on any PFI or RTSI terminal.

Phase-Locked Loop (PLL)

Table 28. Phase-Locked Loop (PLL)
Number of PLLs	1
Output of PLL	100 MHz Timebase; other signals derived from 100 MHz Timebase including 20 MHz and 100 kHz Timebases

Table 29. Reference Clock Locking Frequency
PXIe_DSTAR<A,B>	10 MHz, 20 MHz, 100 MHz
PXI_STAR	10 MHz, 20 MHz
PXIe_CLK100	100 MHz
PXI_TRIG <0..7>	10 MHz, 20 MHz
PFI <0..15>	10 MHz, 20 MHz

External Digital Triggers

Table 30. External Digital Triggers
Source	Any PFI, PXIe_DSTAR<A,B>, PXI_TRIG, PXI_STAR
Polarity	Software-selectable for most signals
Analog input function	Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Convert Clock, Sample Clock Timebase
Analog output function	Start Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase
Counter/timer functions	Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down, Sample Clock
Digital waveform generation (DO) function	Start Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase
Digital waveform acquisition (DI) function	Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase

Device-to-Device Trigger Bus

Table 31. Device-to-Device Trigger Bus
Input source	PXI_TRIG <0..7>, PXI_STAR, PXIe_DSTAR<A, B>
Output destination	PXI_TRIG <0..7>, PXIe_DSTARC
Output selections	10 MHz Clock; frequency generator output; many internal signals
Debounce filter settings	90 ns, 5.12 μs, 2.56 ms, custom interval, disable; programmable high and low transitions; selectable per input

Bus Interface

Table 32. Bus Interface
Form factor	x1 PXI Express peripheral module, specification rev 1.0 compliant
Slot compatibility	x1 and x4 PXI Express or PXI Express hybrid slots
DMA channels	8, can be used for analog input, analog output, digital input, digital output, counter/timer 0, counter/timer 1, counter/timer 2, counter/timer 3

Power Requirements

Caution The protection provided by the device can be impaired if the device is used in a manner not described in the X Series User Manual.

Table 33. Power Requirements
+3.3 V	1.6 W
+12 V	19.8 W

Current Limits

Notice Exceeding the current limits may cause unpredictable device behavior.

Table 34. Current Limits
+5 V terminal (connector 0)	1 A maximum
+5 V terminal (connector 1)	1 A maximum
P0/PFI/P1/P2 and +5 V terminals combined	2 A maximum

Note Each +5 V terminal is protected by a self-resetting fuse that opens if the current exceeds 1 A.

Physical Characteristics

Table 35. Physical Characteristics
Printed circuit board dimensions	Standard 3U PXI
Weight	157 g (5.5 oz)

Table 36. I/O connectors
Module connector	68-Pos Right Angle Dual Stack PCB-Mount VHDCI (Receptacle)
Cable connector	68-Pos Offset IDC Cable Connector (Plug)(SHC68-*)

Note For more information about the connectors used for DAQ devices, refer to the document NI DAQ Device Custom Cables, Replacement Connectors, and Screws.

Calibration

Table 37. Calibration
Recommended warm-up time	15 minutes
Calibration interval	2 years

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the common-mode voltage.

Table 38. Maximum Working Voltage
Channel to earth	11 V

Environmental Guidelines

Notice This product is intended for use in indoor applications only.

Environmental Characteristics

Table 39. Temperature
Operating	0 ºC to 55 ºC
Storage	-40 ºC to 71 ºC

Table 40. Humidity
Operating	10% to 90% RH, noncondensing
Storage	5% to 95% RH, noncondensing

Table 41. Pollution Degree
Pollution degree	2

Table 42. Maximum Altitude
Maximum altitude	2,000 m

Table 43. Shock and Vibration
Operating vibration	5 Hz to 500 Hz, 0.3 g RMS
Non-operating vibration	5 Hz to 500 Hz, 2.4 g RMS
Operating shock	30 g, half-sine, 11 ms pulse

Safety Compliance Standards

This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:

IEC 61010-1, EN 61010-1
UL 61010-1, CSA C22.2 No. 61010-1

Note For safety certifications, refer to the product label or the Product Certifications and Declarations section.

Electromagnetic Compatibility Standards

This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:

EN 61326-1 (IEC 61326-1): Class A emissions; Basic immunity
EN 55011 (CISPR 11): Group 1, Class A emissions
AS/NZS CISPR 11: Group 1, Class A emissions
FCC 47 CFR Part 15B: Class A emissions
ICES-001: Class A emissions

Note Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical equipment that does not intentionally generate radio frequency energy for the treatment of material or inspection/analysis purposes.

Note In the United States (per FCC 47 CFR), Class A equipment is intended for use in commercial, light-industrial, and heavy-industrial locations. In Europe, Canada, Australia and New Zealand (per CISPR 11) Class A equipment is intended for use only in heavy-industrial locations.

Notice For EMC declarations and certifications, and additional information, refer to the Product Certifications and Declarations section.

CE Compliance

This product meets the essential requirements of applicable European Directives, as follows:

2014/35/EU; Low-Voltage Directive (safety)
2014/30/EU; Electromagnetic Compatibility Directive (EMC)
2011/65/EU; Restriction of Hazardous Substances (RoHS)

Product Certifications and Declarations

Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for NI products, visit ni.com/product-certifications, search by model number, and click the appropriate link.

Environmental Management

NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.

For additional environmental information, refer to the Engineering a Healthy Planet web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

EU and UK Customers

Waste Electrical and Electronic Equipment (WEEE)—At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee.

电子信息产品污染控制管理办法（中国RoHS）

中国RoHS— NI符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于NI中国RoHS合规性信息，请登录 ni.com/environment/rohs_china。(For information about China RoHS compliance, go to ni.com/environment/rohs_china.)