PXIe-4081 Specifications

PXIe-4081 Specifications

These specifications apply to the PXIe-4081, a PXIe, 7½-Digit, ±1,000 V, Onboard 1.8 MS/s Isolated Digitizer, PXI Digital Multimeter.

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 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
  • Warm-up time of 60 minutes
  • Resolution set to 6.5 digits or higher for specifications requiring an aperture greater than or equal to 100 ms

PXIe-4081 Pinout

Figure 1. PXIe-4081 Connector Pinout
Table 1. Signal Descriptions
Signal Name Description
Input HI High-input impedance terminal with a positive polarity defined as Input HI > Input LO. Use this terminal in conjunction with Input LO to measure voltage, 2-wire resistance, and sourcing a test current in 4-wire resistance mode.
Input LO Low-input impedance terminal that must be connected for all measurement types. Use this terminal in conjunction with Input HI to measure voltage, 2-wire resistance, and sourcing a test current in 4-wire resistance mode. Use this terminal in conjunction with Sense HI to measure current.
Sense HI Positive input terminal when measuring current. Positive current is defined as current flowing into the Sense HI terminal and out of the Input LO terminal. Sense HI is also a high-input impedance terminal when measuring 4-wire resistance. In this mode, connect the terminal to Input HI as close to the DUT as possible to avoid measuring parasitic resistance in the cabling and fixturing.
Sense LO High-input impedance terminal when measuring 4-wire resistance. In this mode, connect the terminal to Input LO as close to the DUT as possible to avoid measuring parasitic resistance in the cabling and fixturing.

DC Voltage Specifications

DC Voltage Accuracy Specifications

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 2. DC Voltage ± (ppm of reading + ppm of range)
Range Input resistance[1]1 In parallel with 90 pF, typical. 24 hour[2]2 Relative to external calibration source. Tselfcal ±1 °C 90 day Tselfcal ±5 °C 2 year Tselfcal ±5 °C Tempco/°C[3]3 Accuracy specifications allow for the indicated temperature variation. If the device temperature falls outside of that bounds, apply the Tempco 'Without Self-Cal'. Tempco 'With Self-Cal' describes the stability of the calibration mechanism, and is included for reference.
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[4]4 To account for self-heating effects, add 14 µV to the specification for each volt beyond ±300 V. 4 + 0.5 24 + 0.5 25 + 0.5 3 + 0.02 0.3 + 0.01

DC Voltage Noise

Note The following graph represents DC voltage noise 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.
Figure 2. DC Voltage Noise, Typical


DC Voltage General Specifications

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

Resistance Accuracy Specifications

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 3. Resistance (4-Wire and 2-Wire) ± (ppm of reading + ppm of range)
Range Test current[5]5 -10% to 0% tolerance, typical. Max test voltage[6]6 Highest nominal voltage present with highest range resistance applied. Open circuit voltage[7]7 Nominal voltage present at output with no resistance load. 24 hour[8]8 Relative to external calibration source. Tselfcal ± 1 °C 90 day Textcal ± 10 °C, Tselfcal ± 5 °C 2 year Textcal ± 10 °C, Tselfcal ± 5 °C Tempco/°C[9]9 Accuracy specifications allow for the indicated temperature variation. If the device temperature falls outside of that bounds, apply the Tempco 'Without Self-Cal'. Tempco 'With Self-Cal' describes the stability of the calibration mechanism, and is included for reference. 2 Year[10]10 Over full operating temperature range. Tselfcal ± 5 °C
Without Self-Cal With Self-Cal
100 Ω 1 mA 100 mV 11.3 9 + 5 40 + 12 55 + 12 5 + 0.12 0.8 + 0.12 60 + 12
1 kΩ 1 mA 1 V 11.3 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 11.7 7 + 0.5 30 + 1.5 45 + 1.5 5 + 0.05 0.8 + 0.05 50 + 1.5
100 kΩ[11]11 Perform offset nulling or add 2 ppm of range to the specifications. 10 µA 1 V 11.7 7 + 1 36 + 2.5 45 + 2.5 5 + 0.2 2 + 0.2 95 + 2.5
1 MΩ 10 µA 10 V 11.7 6 + 1 60 + 1 60 + 1 5 + 0.05 2 + 0.05 95 + 1
10 MΩ 1 µA 10 V 11.6 60 + 2 130 + 10 130 + 10 20 + 1 20 + 1 800 + 10
100 MΩ[12]12 2-wire resistance measurement only. 1 µA || 10 MΩ 10 V 9.7 500+ 6 2600 + 10 3000 + 10 300 + 6 300 + 6 —
5 GΩ[13]13 2-wire resistance measurement only. (typical) 1 µA || 10 MΩ 10 V 9.7 1% + 0.2% 5% + 0.2% 5% + 0.2% 0.5% + 0.2% 0.5% + 0.2% —
Note For 2-wire resistance measurements, perform offset nulling or add 200 mΩ to reading.

Resistance Noise

Note The following graph representes resistance noise 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.
Figure 3. PXIe-4081 Resistance Noise, Typical

Resistance General Specifications

Maximum 4-wire lead resistance Use the lesser of 10% of range or 1 kΩ

DC Current Specifications

DC Current Accuracy Specifications

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

Table 4. DC Current ± (ppm of reading + ppm of range)
Range Burden voltage, typical 24 hour[14]14 Relative to external calibration source. Tselfcal ±1 °C 90 day Textcal ± 10 °C, Tselfcal ± 5 °C 2 year Textcal ± 10 °C, Tselfcal ± 5 °C Tempco/°C 2 year[15]15 Over full operating temperature range. Tselfcal ± 5 °C
1 µA[16]16 90 day and 2 year specifications are typical. <55 mV 30 + 20 340 + 40 350 + 40 10 + 5 575 + 140
10 µA[17]17 90 day and 2 year specifications are typical. <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[18]18 To account for self-heating effects, for currents larger than 500 mA, add I2 x 75 ppm of reading to the specification. <250 mV 25 + 10 275 + 20 350 + 20 16 + 0.2 800 + 20
3 A[19]19 To account for self-heating effects, for currents larger than 500 mA, add I2 x 75 ppm of reading to the specification. <700 mV 25 + 5 250 + 20 350 + 20 16 + 0.2 800 + 20

DC Current Noise

Note The following graph represents DC current noise 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.
Figure 4. PXIe-4081 DC Current Noise, Typical

DC Current General Specifications

Overrange 105% of range except 1 A range

AC Voltage Specifications

AC Voltage Accuracy Specifications

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 5. AC Voltage Accuracy ± (% of reading + % of range), 2 Years, Textcal ± 10 °C
Range (RMS) Peak voltage 1 Hz to 40 Hz[20]20 Applies to DC coupled only. >40 Hz to 20 kHz >20 kHz to 50 kHz >50 kHz to 100 kHz >100 kHz to 300 kHz
50 mV[21]21 Applies to signals >1 mVrms ±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 0.12 + 0.05 0.6 + 0.05 3 + 0.15 3 + 0.15
700 V ±1000 V
Table 6. 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 0.012 + 0.001 0.045 + 0.001 0.1 + 0.01 0.1 + 0.01
700 V

AC Voltage General Specifications

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

AC Current Accuracy Specifications

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 7. AC Current Specifications ± (% of reading + % of range), 2 Years, Textcal ± 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[22]22 Specification typical above 5 kHz 10 kHz to 20 kHz [23]23 Specification typical above 5 kHz Tempco/°C
100 µA[24]24 Applies to signals > 9 μArms ±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[25]25 Sine wave only. <700 mV 0.08 + 0.02 0.41 + 0.02 0.9 + 0.02 1.6 + 0.02 0.002 + 0.0001

AC Current General Specifications

Overrange 105% of range except 3 A

Diode Test Specifications

Range 10 V
Test current[26]26 -13% to 0% tolerance, typical. 1 µA, 10 µA, 100 µA, 1 mA[27]27 Up to 4.5 V measurement for 1 mA test current.
Accuracy Add 20 ppm of reading to 10 VDC voltage specifications.

Frequency and Period

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[28]28 AC Coupled. Minimum peak-to-peak signal amplitude[29]29 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. 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 the lowest possible resistance or voltage range for each temperature. Add probe accuracy and cold junction accuracy where applicable.

Sensor type Temperature range Accuracy
RTD[30]30 Based on Pt3851 RTD in a 4-wire configuration. -200 °C to 600 °C 0.1 °C
Thermistor[31]31 Based on 44004, 44006, and 44007 interchangeable thermistors. -80 °C to 150 °C 0.08 °C
J Thermocouple -210 °C to 1200 °C 0.2 °C
K Thermocouple -200 °C to 1200 °C 0.3 °C
N Thermocouple -200 °C to 1300 °C 0.4 °C
T Thermocouple -200 °C to 400 °C 0.3 °C
E Thermocouple -200 °C to 1000 °C 0.2 °C
R Thermocouple -50 °C to 1760 °C 0.8 °C
S Thermocouple -50 °C to 1760 °C 0.8 °C
B Thermocouple 400 °C 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 100 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 8. Voltage Mode
Range Input resistance[32]32 In parallel with 90 pF. When AC coupled, only 10 MΩ available. DC accuracy (ppm/reading + ppm/range) 2 year, Tselfcal ±5 °C Analog bandwidth[33]33 Typical AC coupled frequency is 6 Hz (+/- 0.1 dB) and 0.8 Hz (-3 dB)., 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 5. PXIe-4081 Voltage Waveform Noise with Input Shorted, Typical


Table 9. 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 6. PXIe-4081 Current Waveform Noise with Input Open, Typical


General Specifications

External calibration interval 2 years
Warm-up 60 minutes to rated accuracy
Measurement Category I (up to 1000 VDC, 700 VACrms, 1000 Vpk)

II (up to 250 VACrms, 220 VDC)
Caution Do not connect the product to signals or use 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
Maximum common-mode voltage 500 VDC or VACrms
Maximum Voltage to Earth Ground
HI 1000 VDC or Vpk
LO 500 VDC or VACrms
HI SENSE 500 VDC or VACrms
LO SENSE 500 VDC or VACrms
Fuse When this fuse symbol is marked on a device, take proper precautions.
Caution Take precautions to avoid electrical shock.

Timing

Mode Trigger latency Maximum reading rate[34]34 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 affects the reading rate.
AC voltage All functions except AC voltage[35]35 Trigger latency for all functions except AC Voltage assumes Auto Zero, Offset Compensated Ohms, and ADC Calibration are OFF.
Voltage, current, and resistance 15 µs <0 µs 20 kS/s
Voltage and current digitizer 1.8 MS/s

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
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

Relative humidity range

10% to 90%, noncondensing

Storage Environment

Ambient temperature range

-40 °C to 71 °C

Relative humidity range

5% to 95%, noncondensing

Shock and Vibration

Operating shock

30 g peak, half-sine, 11 ms pulse

Random vibration

Operating

5 Hz to 500 Hz, 0.3 g RMS

Nonoperating

5 Hz to 500 Hz, 2.4 g RMS

1 In parallel with 90 pF, typical.

2 Relative to external calibration source.

3 Accuracy specifications allow for the indicated temperature variation. If the device temperature falls outside of that bounds, apply the Tempco 'Without Self-Cal'. Tempco 'With Self-Cal' describes the stability of the calibration mechanism, and is included for reference.

4 To account for self-heating effects, add 14 µV to the specification for each volt beyond ±300 V.

5 -10% to 0% tolerance, typical.

6 Highest nominal voltage present with highest range resistance applied.

7 Nominal voltage present at output with no resistance load.

8 Relative to external calibration source.

9 Accuracy specifications allow for the indicated temperature variation. If the device temperature falls outside of that bounds, apply the Tempco 'Without Self-Cal'. Tempco 'With Self-Cal' describes the stability of the calibration mechanism, and is included for reference.

10 Over full operating temperature range.

11 Perform offset nulling or add 2 ppm of range to the specifications.

12 2-wire resistance measurement only.

13 2-wire resistance measurement only.

14 Relative to external calibration source.

15 Over full operating temperature range.

16 90 day and 2 year specifications are typical.

17 90 day and 2 year specifications are typical.

18 To account for self-heating effects, for currents larger than 500 mA, add I2 x 75 ppm of reading to the specification.

19 To account for self-heating effects, for currents larger than 500 mA, add I2 x 75 ppm of reading to the specification.

20 Applies to DC coupled only.

21 Applies to signals >1 mVrms

22 Specification typical above 5 kHz

23 Specification typical above 5 kHz

24 Applies to signals > 9 μArms

25 Sine wave only.

26 -13% to 0% tolerance, typical.

27 Up to 4.5 V measurement for 1 mA test current.

28 AC Coupled.

29 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.

30 Based on Pt3851 RTD in a 4-wire configuration.

31 Based on 44004, 44006, and 44007 interchangeable thermistors.

32 In parallel with 90 pF. When AC coupled, only 10 MΩ available.

33 Typical AC coupled frequency is 6 Hz (+/- 0.1 dB) and 0.8 Hz (-3 dB).

34 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 affects the reading rate.

35 Trigger latency for all functions except AC Voltage assumes Auto Zero, Offset Compensated Ohms, and ADC Calibration are OFF.