Table Of Contents

PXIe-4081 Specifications

Version:
    Last Modified: February 21, 2017

    These specifications apply to the PXIe-4081.

    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 expected performance met by a majority of the models.
    • Nominal specifications describe parameters and attributes that may be useful in operation.

    Specifications are Warranted unless otherwise noted.

    Textcal is the device temperature at last external calibration.

    Tselfcal is the device temperature at last self-calibration.

    Conditions

    Specifications are valid under the following conditions unless otherwise noted. Refer to each section for additional conditions that apply.

    • Self-calibration performed within the last 24 hours
    • Calibration interval of 2 years
    • 60 minutes warm-up time

    DC Voltage Specifications

    Accuracy

    All DC voltage accuracy specifications apply to apertures of ≥100 ms, with Auto Zero and ADC calibration enabled. Assumes offset nulling. Otherwise, add 2 µV to the specifications.

    Table 1. DC Voltage ± (ppm of reading + ppm of range)
    Range Input Resistance[1] 24 Hr[2] Tselfcal ±1 °C 90 Day Tselfcal ±5 °C 2 Year Tselfcal ±5 °C Tempco/°C
    Without Self-Cal With Self-Cal
    100 mV 10 MΩ ± 2%, >10 GΩ 6 + 5 27 + 7 28 + 8 3 + 2 0.3 + 1
    1 V 4.5 + 0.8 15 + 2.5 18 + 2.5 2 + 0.2 0.3 + 0.1
    10 V 2 + 0.5 10.5 + 0.5 12 + 0.5 0.3 + 0.02 0.3 + 0.01
    100 V 10 MΩ ± 2% 6 + 2 24 + 2.5 26 + 2.5 4 + 0.2 0.3 + 0.1
    1000 V[3] 4 + 0.5 24 + 0.5 25 + 0.5 3 + 0.02 0.3 + 0.01

    Noise

    Figure 1. DC Voltage Noise, Typical
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    Note  

    With input shorted, Normal DC Noise Rejection, and Auto Zero ON. For apertures less than 100 ms, add five times the typical rms noise to the accuracy specification.

    General

    ADC Linearity

    0.5 ppm of reading + 0.5 ppm of range

    Effective Common-Mode Rejection Ratio (CMRR) (1 kΩ resistance in LO lead)

    >140 dB (DC), 100 ms aperture; >170 dB (>46 Hz) with high-order DC noise rejection, 100 ms aperture, typical

    Overrange

    105% of range except 1000 V

    DC voltage input bias current

    <30 pA at 23 °C, typical

    Resistance Specifications

    Accuracy

    All resistance accuracy specifications apply to apertures of ≥100 ms, with Offset Compensated Ohms (for ranges ≤10 kΩ) or Auto Zero (for ranges ≥ 100 kΩ) and ADC calibration enabled.

    Table 2. Resistance (4-Wire and 2-Wire [4]) ± (ppm of reading + ppm of range)
    Range Test Current[5] Max Test Voltage 24 Hr[6] Tselfcal ± 1 °C 90 Day Textcal ± 10 °C, Tselfcal ± 5 °C 2 Year Textcal ± 10 °C, Tselfcal ± 5 °C Tempco/°C 2 Year[7] Tselfcal ± 5 °C
    Without Self-Cal With Self-Cal
    100 Ω 1 mA 100 mV 9 + 5 40 + 12 55 + 12 5 + 0.12 0.8 + 0.12 60 + 12
    1 kΩ 1 mA 1 V 7 + 0.5 30 + 1.5 45 + 1.5 5 + 0.05 0.8 + 0.05 50 + 1.5
    10 kΩ 100 µA 1 V 7 + 0.5 30 + 1.5 45 + 1.5 5 + 0.05 0.8 + 0.05 50 + 1.5
    100 kΩ[8] 10 µA 1 V 7 + 1 36 + 2.5 45 + 2.5 5 + 0.2 2 + 0.2 95 + 2.5
    1 MΩ 10 µA 10 V 6 + 1 60 + 1 60 + 1 5 + 0.05 2 + 0.05 95 + 1
    10 MΩ 1 µA 10 V 60 + 2 130 + 10 130 + 10 20 + 1 20 + 1 800 + 10
    100 MΩ[9] 1 µA || 10 MΩ 10 V 500+ 6 2600 + 10 3000 + 10 300 + 6 300 + 6
    5 GΩ[9] (typical) 1 µA || 10 MΩ 10 V 1% + 0.2% 5% + 0.2% 5% + 0.2% 0.5% + 0.2% 0.5% + 0.2%

    Noise

    Figure 2. PXIe-4081 Resistance Noise, Typical
    spd-note-note
    Note  

    With input shorted, Normal DC Noise Rejection, and Auto Zero ON. For apertures less than 100 ms, add five times the typical rms noise to the accuracy specification.

    General

    Maximum 4-wire lead resistance

    Use the lesser of 10% of range or 1 kΩ

    DC Current Specifications

    Accuracy

    All DC current accuracy specifications apply for apertures ≥100 ms, with Auto Zero and ADC calibration enabled.

    Table 3. DC Current ± (ppm of reading + ppm of range)
    Range Burden Voltage, Typical 24 Hr[10] Tselfcal ±1 °C 90 Day Textcal ± 10 °C, Tselfcal ± 5 °C 2 Year Textcal ± 10 °C, Tselfcal ± 5 °C Tempco/°C 2 Year[11] Tselfcal ± 5 °C
    1 µA[12] <55 mV 30 + 20 340 + 40 350 + 40 10 + 5 575 + 140
    10 µA[12] <550 mV 30 + 2 140 + 15 200 + 15 10 + 1 500 + 20
    100 µA <60 mV 10 + 10 105 + 20 175 + 20 5 + 0.2 220 + 20
    1 mA <60 mV 13 + 10 100 + 20 170 + 20 5 + 0.2 220 + 20
    10 mA <60 mV 15 + 10 100 + 20 170 + 20 5 + 0.2 250 + 20
    100 mA <100 mV 18 + 10 175 + 20 180 + 20 10 + 0.2 250 + 20
    1 A,[13] <250 mV 25 + 10 275 + 20 350 + 20 16 + 0.2 800 + 20
    3 A [13] <700 mV 25 + 5 250 + 20 350 + 20 16 + 0.2 800 + 20

    Noise

    Figure 3. PXIe-4081 DC Current Noise, Typical
    spd-note-note
    Note  

    With input open, Normal DC Noise Rejection, and Auto Zero ON. For apertures less than 100 ms, add five times the typical rms noise to accuracy specification.

    General

    Overrange

    105% of range except 1 A range.

    AC Voltage Specifications

    Accuracy

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    Note  

    Measurement aperture greater than 4/fL where fL is the lowest frequency component of the signal being measured. Signal amplitudes greater than 1% of range.

    Table 4. AC Voltage Accuracy ± (% of reading + % of range), 2 Years, T selfcal ± 5 °C
    Range (rms) Peak Voltage 1 Hz to 40 Hz[14] >40 Hz to 20 kHz >20 kHz to 50 kHz >50 kHz to 100 kHz >100 kHz to 300 kHz
    50 mV[15] ±105 mV 0.1 + 0.02 0.05 + 0.02 0.07 + 0.02 0.3 + 0.02 0.7 + 0.15
    500 mV ±1.05 V 0.1 + 0.005 0.05 + 0.005 0.06 + 0.01 0.2 + 0.01 0.7 + 0.15
    5 V ±10.5 V
    50 V ±105 V 0.1 + 0.005 0.06 + 0.01 0.12 + 0.05 0.6 + 0.05 3 + 0.15
    700 V ±1000 V
    Table 5. AC Voltage Tempco/°C ± (% of reading + % of range)
    Range (rms) 1 Hz to 40 Hz >40 Hz to 20 kHz >20 kHz to 50 kHz >50 kHz to 100 kHz >100 kHz to 300 kHz
    50 mV 0.001 + 0.0002 0.001 + 0.0002 0.001 + 0.001 0.002 + 0.001 0.02 + 0.01
    500 mV
    5 V
    50 V 0.001 + 0.0002 0.003 + 0.0002 0.012 + 0.001 0.045 + 0.001 0.1 + 0.01
    700 V

    General

    Input impedance

    10 MΩ ± 2% in parallel with 90 pF, typical

    Input coupling

    AC or DC coupled

    Overrange

    105% of range except 700 V

    Maximum Volt-Hertz product

    Verified to 2.2 x 107 V-Hz

    Maximum DC voltage component

    400 V

    Common mode rejection ratio (CMRR), 1 kΩ resistance in LO lead

    >70 dB (DC to 60 Hz), typical

    AC Current Specifications

    Accuracy

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    Note  

    Measurement aperture greater than 4/fL, where fL is the lowest frequency component of the signal being measured. Signal amplitudes greater than 1% of range.

    Table 6. AC Current Specifications ± (% of reading + % of range), 2 Years, T extcal ± 10 °C
    Range (rms) Peak Current Burden Voltage (rms at 1 kHz), Typical 1 Hz to 1 kHz >1 kHz to 5 kHz 5 kHz to 10 kHz[16] 10 kHz to 20 kHz[16] Tempco/°C
    100 µA[17] ±200 µA <60 mV 0.065 + 0.02 0.002 + 0.0002
    1 mA ±2 mA <60 mV 0.035 + 0.02 0.06 + 0.02 0.19 + 0.02 0.44 + 0.02 0.001 + 0.0001
    10 mA ±20 mA <60 mV 0.035 + 0.02 0.045 + 0.02 0.1 + 0.02 0.17 + 0.02 0.002 + 0.0002
    100 mA ±200 mA <100 mV 0.04 + 0.02 0.07 + 0.02 0.1 + 0.02 0.1 + 0.02 0.001 + 0.0002
    1 A ±2 A <250 mV 0.07 + 0.02 0.4 + 0.02 0.9 + 0.02 1.6 + 0.02 0.002 + 0.0001
    3 A ±4.2 A[18] <700 mV 0.08 + 0.02 0.41 + 0.02 0.9 + 0.02 1.6 + 0.02 0.002 + 0.0001

    General

    Overrange

    105% of range except 3 A

    Diode Test Specifications

    Range

    10 V

    Test current[19]

    1 µA, 10 µA, 100 µA, 1 mA[20]

    Accuracy

    Add 20 ppm of reading to 10 VDC voltage specifications.

    Frequency and Period Specifications

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    Note  

    Aperture time set to 150 ms.

    Frequency measurement range

    15 Hz to 500 kHz

    Period measurement range

    2 µs to 66.67 ms

    Frequency Input Voltage Range Corresponding Digitizer Range[21] Minimum Peak-to-Peak Signal Amplitude[22] Maximum Peak-to-Peak Signal Amplitude Accuracy
    50 mV 100 mV 5 mV 200 mV Refer to the PXIe_CLK100 accuracy of the chassis.
    500 mV 1 V 50 mV 2 V
    5 V 10 V 500 mV 20 V
    50 V 100 V 5 V 200 V
    700 V 1000 V 50 V 1000 V

    Temperature Specifications

    All temperature accuracy specifications apply to apertures ≥100 ms, Auto Zero, and ADC calibration enabled. Use lowest possible resistance or voltage range for each temperature. Add probe accuracy and cold junction accuracy where applicable.

    Sensor Type Temperature Range Accuracy
    RTD[23] -200 to 600 °C 0.1 °C
    Thermistor[24] -80 to 150 °C 0.08 °C
    J Thermocouple -210 to 1200 °C 0.2 °C
    K Thermocouple -200 to 1200 °C 0.3 °C
    N Thermocouple -200 to 1300 °C 0.4 °C
    T Thermocouple -200 to 400 °C 0.3 °C
    E Thermocouple -200 to 1000 °C 0.2 °C
    R Thermocouple -50 to 1760 °C 0.8 °C
    S Thermocouple -50 to 1760 °C 0.8 °C
    B Thermocouple 400 to 1820 °C 0.8 °C

    Isolated Digitizer Specifications

    Available functions

    Voltage and current

    Voltage ranges

    ±100 mV to ±1000 V (DC or AC coupled)

    Current ranges

    ±1 µA to ±3 A

    Sample rate range

    10 S/s to 1.8 MS/s

    Available sample rates

    r = (1.8 MS/s) / y, where y = 1, 2, 3,...1.8 x 105

    Timebase accuracy

    Equal to the PXIe_CLK100 accuracy of the chassis

    Digitizer record length

    2 samples minimum, unlimited maximum

    Table 7. Voltage Mode
    Range Input Resistance[25] DC Accuracy (ppm/reading + ppm/range) 2 Year, Tselfcal ± 5 °C Analog Bandwidth,[26] Typical
    ±0.1 dB -3 dB
    100 mV 10 MΩ ± 2%, >10 GΩ 125 + 175 60 kHz 300 kHz
    1 V 125 + 75 50 kHz 300 kHz
    10 V 125 + 75 50 kHz 300 kHz
    100 V 10 MΩ ± 2% 125 + 75 20 kHz 250 kHz
    1000 V 125 + 75 30 kHz 275 kHz
    Figure 4. PXIe-4081 Voltage Waveform Noise, Typical
    spd-note-note
    Note  

    With input shorted.

    Table 8. Current Mode
    Range Burden Voltage, Typical DC Accuracy (ppm/reading + ppm/range) 2 Year, Tselfcal ± 5 °C Analog Bandwidth, Typical
    ±0.1 dB -3 dB
    100 µA <60 mV 230 + 75 50 kHz 350 kHz
    1 mA <60 mV 230 + 75 60 kHz 400 kHz
    10 mA <60 mV 265 + 75 70 kHz 400 kHz
    100 mA <100 mV 265 + 75 80 kHz 400 kHz
    1 A <250 mV 800 + 75 10 kHz 450 kHz
    3 A <700 mV 800 + 75 10 kHz 450 kHz
    Figure 5. PXIe-4081 Current Waveform Noise, Typical
    spd-note-note
    Note  

    With input open.

    General Specifications

    External calibration interval

    2 years

    Warm-up

    60 minutes to rated accuracy

    Measurement Category

    I[27] (up to 1000 VDC, 700 Vrms, 1000 Vpk) II (up to 500 VDC or Vrms)

    spd-note-caution
    Caution  

    Do not use this device for connection to signals or for measurements within Measurement Categories III or IV.

    Input protection (between terminals or terminal to ground)

    1000 VDC or Vpk

    Current mode fuse

    T 3.5 A 1000 V, time-lag Minimum interrupt rating: 10 kA Siba 5019906.3,5

    spd-note-fuse-symbol
    Fuse  

    When this fuse symbol is marked on a device, take proper precautions.

    Maximum common-mode voltage

    500 VDC or Vrms

    Maximum voltage-to-earth ground

    HI

    1000 VDC or Vpk

    LO

    500 VDC or Vrms

    HI SENSE

    500 VDC or Vrms

    LO SENSE

    500 VDC or Vrms

    spd-note-
    Hazardous Voltage  

    This icon denotes a warning advising you to take precautions to avoid electrical shock.

    Timing

    Mode Trigger Latency Maximum Reading Rate[28]
    Voltage, current, and resistance ≤556 ns 20 kS/s
    Voltage and current digitizer

    Power

    Power consumption

    <9 W from PXI Express backplane

    +12 V load

    0.55 A max

    +3.3 V load

    0.55 A max

    Physical Characteristics

    Dimensions

    3U, one-slot, PXI/cPCI module; 2.0 cm x 13.0 cm x 21.6 cm (0.8 in. x 5.1 in. x 8.5 in.), nominal

    Weight

    340 g (12 oz), nominal

    spd-note-note
    Note  

    If you need to clean the device, wipe it with a dry towel.

    Environment

    Maximum altitude

    2,000 m (800 mbar) (at 25 °C ambient temperature)

    Pollution Degree

    2

    Indoor use only.

    Operating Environment

    Ambient temperature range

    0 °C to 55 °C (Tested in accordance with IEC 60068-2-1 and IEC 60068-2-2. Meets MIL-PRF-28800F Class 3 low temperature limit and MIL-PRF-28800F Class 2 high temperature limit.)

    Relative humidity range

    10% to 90%, noncondensing (Tested in accordance with IEC 60068-2-56.)

    Storage Environment

    Ambient temperature range

    -40 °C to 71 °C (Tested in accordance with IEC 60068-2-1 and IEC 60068-2-2. Meets MIL-PRF-28800F Class 3 limits.)

    Relative humidity range

    5% to 95%, noncondensing (Tested in accordance with IEC 60068-2-56.)

    Shock and Vibration

    Operating shock

    30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC 60068-2-27. Meets MIL-PRF-28800F Class 2 limits.)

    Random vibration

    Operating

    5 Hz to 500 Hz, 0.3 grms (Tested in accordance with IEC 60068-2-64.)

    Nonoperating

    5 Hz to 500 Hz, 2.4 grms (Tested in accordance with IEC 60068-2-64. Test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

    Compliance and Certifications

    spd-note-caution
    Caution  

    Electromagnetic interference can adversely affect the measurement accuracy of this product. The input terminals of this device are not protected for electromagnetic interference. As a result, this device may experience reduced measurement accuracy or other temporary performance degradation when connected cables are routed in an environment with radiated or conducted radio frequency electromagnetic interference. To limit radiated emissions and to ensure that this device functions within specifications in its operational electromagnetic environment, take precautions when designing, selecting, and installing measurement probes and cables.

    Safety

    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
    spd-note-note
    Note  

    For UL and other safety certifications, refer to the product label or the Online Product Certification section.

    Electromagnetic Compatibility

    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
    • EN 55022 (CISPR 22): Class A emissions
    • EN 55024 (CISPR 24): Immunity
    • AS/NZS CISPR 11: Group 1, Class A emissions
    • AS/NZS CISPR 22: Class A emissions
    • FCC 47 CFR Part 15B: Class A emissions
    • ICES-001: Class A emissions
    spd-note-note
    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.

    spd-note-note
    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.

    spd-note-note
    Note  

    For EMC declarations, certifications, and additional information, refer to the Online Product Certification 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)

    Online Product Certification

    Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, 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)

    spd-note-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.

    电子信息产品污染控制管理办法(中国RoHS)

    spd-note-china-rohs
    中国客户  

    National Instruments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National Instruments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.)

    • 1 In parallel with 90 pF, typical.
    • 2 Relative to external calibration source.
    • 3 To account for self-heating effects, add 14 µV to the specification for each volt beyond ±300 V.
    • 4 Perform offset nulling or add 200 mΩ to reading.
    • 5 -10% to 0% tolerance, typical.
    • 6 Relative to external calibration source.
    • 7 Over full operating temperature range.
    • 8 Perform offset nulling or add 2 ppm of range to the specifications.
    • 9 2-wire resistance measurement only.
    • 10 Relative to external calibration source.
    • 11 Over full operating temperature range.
    • 12 90 day and 2 year specifications are typical.
    • 13 To account for self-heating effects, for currents larger than 500 mA, add I2 x 75 ppm of reading to the specification.
    • 14 Applies to DC coupled only.
    • 15 Applies to signals >1 mVrms
    • 16 Specification typical above 5 kHz
    • 17 Applies to signals > 9 μArms
    • 18 Sine wave only.
    • 19 -10% to 0% tolerance, typical.
    • 20 Up to 4.5 V measurement for 1 mA test current.
    • 21 AC Coupled.
    • 22 Square wave input. Minimum required peak-to-peak signal level is valid only for frequencies up to the -3 dB bandwidth. For higher frequencies, the signal amplitude must be increased. Refer to the Digitizer Voltage Mode for bandwidths.
    • 23 Based on Pt3851 RTD in a 4-wire configuration.
    • 24 Based on 44004, 44006, and 44007 interchangeable thermistors.
    • 25 In parallel with 90 pF. When AC coupled, only 10 MΩ available.
    • 26 Typical AC coupled frequency is 6 Hz (+/- 0.1 dB) and 0.8 Hz (-3 dB).
    • 27 Measurement Categories CAT I and CAT O (Other) are equivalent. These test and measurement circuits are not intended for direct connection to the MAINs building installations of Measurement Categories CAT II, III, or CAT IV.
    • 28 Maximum Reading Rate assumes minimum aperture time, Auto Zero is OFF, Offset Compensated Ohms is OFF, ADC Calibration is OFF, Number of Averages is 1, and Settle Time is 0 seconds. Varying these settings will vary the reading rate.

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