USB-6341 Specifications - National Instruments

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USB-6341-Specifications
USB-6341

SPECIFICATIONS
USB-6341
16 AI (16-Bit, 500 kS/s), 2 AO (900 kS/s), 24 DIO USB Multifunction I/O Device

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 specifications describe 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.

Analog Input
Number of channels ADC resolution DNL INL

16 single ended or 8 differential 16 bits No missing codes guaranteed Refer to AI Absolute Accuracy.

Sample rate

Single channel maximum

500 kSample/s

Multichannel maximum (aggregate)

500 kSample/s

Minimum

No minimum

Timing resolution

10 ns

Timing accuracy

50 ppm of sample rate

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 impedance

Device on

AI+ to AI GND

>10 G in parallel with 100 pF

AI- to AI GND

>10 G in parallel with 100 pF

Device off

AI+ to AI GND

1,200 

AI- to AI GND

1,200 

Input bias current

±100 pA

Crosstalk (at 100 kHz)

Adjacent channels

-75 dB

Non-adjacent channels

-90 dB

Small signal bandwidth (-3 dB)

1.2 MHz

Input FIFO size

2,047 samples

Scan list memory

4,095 entries

Data transfers

USB Signal Stream, programmed I/O

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

Input current during overvoltage condition ±20 mA maximum/AI pin

2 | ni.com | USB-6341 Specifications

Settling Time for Multichannel Measurements

Settling time for multichannel measurements, accuracy, full-scale step, all ranges

±90 ppm of step (±6 LSB)

2 s convert interval

±30 ppm of step (±2 LSB)

3 s convert interval

±15 ppm of step (±1 LSB)

5 s convert interval

Typical Performance Graph
Figure 1. Settling Error versus Time for Different Source Impedances

10 k

Error (ppm of Step Size)

2 k 1 k

10 k

1 k 100

 100 

5 k

10 1

10

100

Time (s)

AI Absolute Accuracy (Warranted)

Table 1. 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,  (µVrms)

Absolute Accuracy at Full Scale
(µV)

10

-10

65

13

23

270

2,190

5

-5

72

13

23

135

1,130

USB-6341 Specifications | © National Instruments | 3

Table 1. AI Absolute Accuracy (Continued)

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,  (µVrms)

Absolute Accuracy at Full Scale
(µV)

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 
For more information about absolute accuracy at full scale, refer to the AI Absolute Accuracy Example section.
Note Accuracies listed are valid for up to two years from the device external calibration.

Gain tempco Reference tempco INL error

7.3 ppm/°C 5 ppm/°C 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

=

Random Noise 10, 000



3

for a coverage factor of 3  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

4 | ni.com | USB-6341 Specifications

NoiseUncertainty:

270 µV  3 10, 000

= 8.1 V

AbsoluteAccuracy: 10 V · (GainError) + 10 V · (OffsetError) + NoiseUncertainty =

2,190 V

Analog Output
Number of channels DAC resolution DNL Monotonicity Maximum update rate (simultaneous)
1 channel 2 channels Timing accuracy Timing resolution Output range Output coupling Output impedance Output current drive Overdrive protection

2 16 bits ±1 LSB 16 bit guaranteed
900 kSample/s 840 kSample/s per channel 50 ppm of sample rate 10 ns ±10 V DC 0.2  ±5 mA ±15 V

USB-6341 Specifications | © National Instruments | 5

Overdrive current Power-on state Power-on/off glitch Output FIFO size Data Transfers AO waveform modes
Settling time, full-scale step, 15 ppm (1 LSB) Slew rate Glitch energy
Magnitude Duration
AO Absolute Accuracy

15 mA ±20 mV 1.5 V for 1.2 s1 8,191 samples shared among channels used USB Signal Stream, programmed I/O Non-periodic waveform, periodic waveform regeneration mode from onboard FIFO, periodic waveform regeneration from host buffer including dynamic update 6 µs
15 V/µs
100 mV 2.6 µs

Table 2. AO Absolute Accuracy

Nominal Nominal

Residual

Residual

INL Absolute

Range Range

Offset

Gain

Gain Reference Offset

Error Accuracy

Positive Negative

Tempco

Error Tempco Tempco Error

(ppm at Full

Full

Full

(ppm of

(ppm of (ppm/°C) (ppm/°C) (ppm of

of

Scale

Scale Scale

Range/°C)

Reading)

Range)

Range) (µV)

(V)

(V)

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.

1 Typical behavior. Time period may be longer due to host system USB performance. Time period will be longer during firmware updates.
6 | ni.com | USB-6341 Specifications

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

Number of channels
Ground reference Direction control
Pull-down resistor Input voltage protection

24 total, 8 (P0.<0..7>), 16 (PFI <0..7>/P1, PFI <8..15>/P2) D GND Each terminal individually programmable as input or output 50 k typical, 20 k minimum ±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)

Terminals used Port/sample size Waveform generation (DO) FIFO Waveform acquisition (DI) FIFO DO or DI Sample Clock frequency Data transfers Digital line filter settings

Port 0 (P0.<0..7>) Up to 8 bits 2,047 samples 255 samples 0 to 1 MHz, system and bus activity dependent USB Signal Stream, programmed I/O 160 ns, 10.24 s, 5.12 ms, disable

USB-6341 Specifications | © National Instruments | 7

PFI/Port 1/Port 2 Functionality

Functionality
Timing output sources Debounce filter settings

Static digital input, static digital output, timing input, timing output
Many AI, AO, counter, DI, DO timing signals
90 ns, 5.12 s, 2.56 ms, custom interval, disable; programmable high and low transitions; selectable per input

Recommended Operating Conditions

Input high voltage (VIH) Minimum Maximum
Input low voltage (VIL) Minimum Maximum
Output high current (IOH) P0.<0..7> PFI <0..15>/P1/P2
Output low current (IOL) P0.<0..7> PFI <0..15>/P1/P2

2.2 V 5.25 V
0 V 0.8 V
-24 mA maximum -16 mA maximum
24 mA maximum 16 mA maximum

Digital I/O Characteristics

Positive-going threshold (VT+) Negative-going threshold (VT-) Delta VT hysteresis (VT+ - VT-) IIL input low current (VIN = 0 V) IIH input high current (VIN = 5 V)

2.2 V maximum 0.8 V minimum 0.2 V minimum -10 A maximum 250 A maximum

8 | ni.com | USB-6341 Specifications

IOH (mA)

0 ­5 ­10 ­15 ­20 ­25 ­30 ­35 ­40 ­45 ­50
2
40 35 30 25 20 15 10
5 0
0

Figure 2. P0.<0..7>: IOH versus VOH
55 °C; Vdd = 4.5 V 25 °C; Vdd = 5.0 V 0 °C; Vdd = 5.5 V

3

4

5

6

VOH (V)

Figure 3. P0.<0..7>: IOL versus VOL

0 °C; Vdd = 5.5 V 25 °C; Vdd = 5.0 V 55 °C; Vdd = 4.5 V

0.2

0.4

0.6

0.8

1.0

1.2

VOL(V)

IOL (mA)

USB-6341 Specifications | © National Instruments | 9

IOH (mA)

Figure 4. PFI <0..15>/P1/P2: IOH versus VOH

0

­5

­10

­15

­20

­25

­30

­35 ­40 ­45 ­50
2

55 °C; Vdd = 4.5 V 25 °C; Vdd = 5.0 V 0 °C; Vdd = 5.5 V

3

4

5

6

VOH (V)

Figure 5. PFI <0..15>/P1/P2: IOL versus VOL

40

0 °C; Vdd = 5.5 V

35

25 °C; Vdd = 5.0 V

55 °C; Vdd = 4.5 V 30

25

20

15

10

5

0

0

0.2

0.4

0.6

0.8

1.0

1.2

VOL (V)

IOL (mA)

General-Purpose Counters

Number of counter/timers Resolution

4 32 bits

10 | ni.com | USB-6341 Specifications

Counter measurements
Position measurements
Output applications
Internal base clocks External base clock frequency Base clock accuracy Inputs
Routing options for inputs FIFO Data transfers

Edge counting, pulse, pulse width, semi-period, period, two-edge separation X1, X2, X4 quadrature encoding with Channel Z reloading; two-pulse encoding Pulse, pulse train with dynamic updates, frequency division, equivalent time sampling 100 MHz, 20 MHz, 100 kHz 0 MHz to 25 MHz 50 ppm Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down, Sample Clock Any PFI, many internal signals 127 samples per counter USB Signal Stream, programmed I/O

Frequency Generator

Number of channels Base clocks Divisors Base clock accuracy

1 20 MHz, 10 MHz, 100 kHz 1 to 16 50 ppm

Output can be available on any PFI or RTSI terminal.

Phase-Locked Loop (PLL)

Number of PLLs PFI <0..15> reference clock locking frequency Output of PLL

1 10 MHz
100 MHz Timebase; other signals derived from 100 MHz Timebase including 20 MHz and 100 kHz Timebases

External Digital Triggers

Source Polarity

Any PFI Software-selectable for most signals

USB-6341 Specifications | © National Instruments | 11

Analog input function
Analog output function
Counter/timer functions
Digital waveform generation (DO) function Digital waveform acquisition (DI) function

Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Convert Clock, Sample Clock Timebase
Start Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase
Gate, Source, HW_Arm, Aux, A, B, Z, Up_Down, Sample Clock
Start Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase
Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase

Bus Interface
USB compatibility USB Signal Stream

USB 2.0 Hi-Speed or full-speed2
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.
Caution The USB device must be powered with an NI offered AC adapter or a National Electric Code (NEC) Class 2 DC source that meets the power requirements for the device and has appropriate safety certification marks for country of use.

Power supply requirements Power input mating connector

11 VDC to 30 VDC, 30 W, 2 positions 3.5 mm pitch pluggable screw terminal with screw locks similar to Phoenix Contact MC 1,5/2-STF-3,5 BK
Phoenix Contact MC 1,5/2-GF-3,5 BK or equivalent

2 Operating on a full-speed bus results in lower performance, and you might not be able to achieve maximum sampling/update rates.
12 | ni.com | USB-6341 Specifications

Current Limits
Caution Exceeding the current limits may cause unpredictable device behavior.

+5 V terminal
P0/PFI/P1/P2 and +5 V terminals combined

1 A maximum3 2 A maximum

Physical Characteristics

Enclosure dimensions (includes connectors) BNC
Screw terminal
Weight BNC Screw terminal
I/O connectors BNC Device connector Screw terminal wiring gauge
Screw terminal Device connector Screw terminal wiring gauge

20.3 cm × 18.5 cm × 6.8 cm (8.0 in. × 7.3 in. × 2.7 in.) 26.4 cm × 17.3 cm × 3.6 cm (10.4 in. × 6.8 in. × 1.4 in.)
1.520 kg (3 lb 5.6 oz) 1.406 kg (3 lb 1.6 oz)
20 BNCs and 30 screw terminals 0.2047 mm2 to 1.3087 mm2 (16 AWG to 24 AWG)
64 screw terminals 0.2047 mm2 to 1.3087 mm2 (16 AWG to 24 AWG)

Note For more information about the connectors used for DAQ devices, refer to the document, NI DAQ Device Custom Cables, Replacement Connectors, and Screws, by going to ni.com/info and entering the Info Code rdspmb.

3 Has self-resetting fuse that opens when current exceeds this specification.
USB-6341 Specifications | © National Instruments | 13

Calibration
Recommended warm-up time Calibration interval

15 minutes 2 years

Maximum Working Voltage

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

Channel to earth

11 V, Measurement Category I

Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated lowvoltage sources, and electronics.

Caution Do not connect the system to signals or use for measurements within Measurement Categories II, III, or IV.

Note Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are for other circuits not intended for direct connection to the MAINS building installations of Measurement Categories CAT II, CAT III, or CAT IV.

Shock and Vibration
Operational shock
Random vibration Operating Nonoperating

30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC 60068-2-27. Test profile developed in accordance with MIL-PRF-28800F.)
5 to 500 Hz, 0.3 grms 5 to 500 Hz, 2.4 grms (Tested in accordance with IEC 60068-2-64. Nonoperating test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

14 | ni.com | USB-6341 Specifications

Environmental
Temperature Operating Storage
Humidity Operating Storage
Pollution Degree Maximum altitude
Indoor use only.

0 °C to 45 °C -40 °C to 70 °C
10% to 90% RH, noncondensing 5% to 95% RH, noncondensing 2 2,000 m

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 UL and other 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.

USB-6341 Specifications | © National Instruments | 15

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/ certification, search by model number or product line, and click the appropriate link in the Certification column.
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 Minimize Our Environmental Impact 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.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers 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.
 RoHS
 National Instruments  (RoHS) National Instruments  RoHS  ni.com/environment/rohs_china(For information about China RoHS compliance, go to ni.com/environment/rohs_china.)
16 | ni.com | USB-6341 Specifications

Information is subject to change without notice. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering NI products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the NI global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.
© 2019 National Instruments. All rights reserved.
377879A-01 February 6, 2019


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