Table Of Contents

PXIe-4135 Specifications

Version:
    Last Modified: February 12, 2018

    These specifications apply to the PXIe-4135.

    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.

    Conditions

    Specifications are valid under the following conditions unless otherwise noted.

    • Ambient temperature[1] of 23 °C ± 5 ºC
    • Relative humidity between 10% and 70%, noncondensing up to 35 °C. Derate max relative humidity 3% per °C for ambient temperatures between 35 °C and 50 °C. From 50 °C to 55 °C, relative humidity between 10% and 25%, noncondensing. See Current Programming and Measurement Accuracy/Resolution for humidity performance restrictions.
    • Calibration interval of 1 year
    • 30 minutes warm-up time
    • Self-calibration performed within the last 24 hours
    • niDCPower Aperture Time property or NIDCPOWER_ATTR_APERTURE_TIME attribute set to 2 power-line cycles (PLC)
    • Fans set to the highest setting if the PXI Express chassis has multiple fan speed settings
    • Triax cover installed on unused triax connections

    Cleaning Statement

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    Caution  

    Clean the hardware with a soft, nonmetallic brush. Make sure that the hardware is completely dry and free from contaminants before returning it to service.

    spd-note-caution
    Caution  

    Due to high-impedance circuits used in the hardware, care should be taken to avoid contamination during handling or operation. Avoid use or storage of the hardware in an environment that allows dust to settle on the hardware. Avoid direct contact with the inner surfaces of triax connections. Triax covers should be used whenever triax connections are not in use.

    Device Capabilities

    The following table and figure illustrate the voltage and the current source and sink ranges of the PXIe-4135.

    Table 1. Current Source and Sink Ranges
    DC voltage ranges DC current source and sink ranges
    • 600 mV
    • 6 V
    • 20 V
    • 200 V[2]
    • 10 nA
    • 1 μA
    • 100 μA
    • 1 mA
    • 10 mA
    • 100 mA
    • 1 A
    • 3 A[3]
    Figure 1. Quadrant Diagram

    DC sourcing power is limited to 20 W, regardless of output voltage.[4]

    spd-note-caution
    Caution  

    Limit DC power sinking to 12 W. Additional derating applies to sinking power when operating at an ambient temperature of >45 °C. If the PXI Express chassis has multiple fan speed settings, set the fans to the highest setting.

    Voltage Programming and Measurement Accuracy/Resolution

    Table 2. Voltage Programming and Measurement Accuracy/Resolution
    Range Resolution (noise limited) Noise (0.1 Hz to 10 Hz, peak to peak), Typical Accuracy (23 °C ±5 °C) ± (% of voltage + offset)[5] Tempco ± (% of voltage + offset)/°C, 0 °C to 55 °C
    Tcal ±5 °C[6] Tcal ±1 °C
    600 mV 100 nV 2 μV 0.020% + 50 μV 0.017% + 30 μV 0.0005% + 1 μV
    6 V 1 μV 6 μV 0.020% + 320 μV 0.017% + 90 μV
    20 V 10 μV 20 μV 0.022% + 1 mV 0.017% + 400 μV
    200 V 100 μV 200 μV 0.025% + 10 mV 0.020% + 2.5 mV

    Current Programming and Measurement Accuracy/Resolution

    Table 3. Current Programming and Measurement Accuracy/Resolution
    Range Resolution (noise limited) Noise (0.1 Hz to 10 Hz, peak to peak), Typical Accuracy (23 °C ±5 °C) ± (% of current + offset)[7], [8] Tempco ± (% of current + offset)/°C, 0 °C to 55 °C
    Tcal ±5 °C[9] Tcal ±1 °C
    10 nA 10 fA 1 pA 0.06% + 6 pA 0.05% + 5 pA 0.0006% + 400 fA
    1 μA 100 fA 4 pA 0.03% + 100 pA 0.022% + 40 pA 0.0006% + 4 pA
    100 μA 10 pA 200 pA 0.03% + 6 nA 0.022% + 2 nA 0.0006% + 200 pA
    1 mA 100 pA 2 nA 0.03% + 60 nA 0.022% + 20 nA 0.0006% + 2 nA
    10 mA 1 nA 20 nA 0.03% + 600 nA 0.022% + 200 nA 0.0006% + 20 nA
    100 mA 10 nA 200 nA 0.03% + 6 μA 0.022% + 2 μA 0.0006% + 200 nA
    1 A 100 nA 2 μA 0.04% + 60 μA 0.035% + 20 μA 0.0006% + 2 μA
    3 A[10] 1 μA 20 μA 0.08% + 900 μA 0.075% + 600 μA 0.0018% + 20 μA

    Noise

    Wideband source noise

    <25 mV peak-to-peak in 20 V range, device configured for normal transient response, 10 Hz to 20 MHz, typical

    The following figures illustrate noise as a function of measurement aperture for the PXIe-4135.

    Figure 2. Voltage Measurement Noise vs. Measurement Aperture, Nominal
    spd-note-note
    Note  

    When the aperture time is set to 2 power-line cycles (PLCs), measurement noise differs slightly depending on whether the niDCPower Power Line Frequency property or NIDCPOWER_ATTR_POWER_LINE_FREQUENCY attribute is set to 50 Hz or 60 Hz.

    Figure 3. Current Measurement Noise vs. Measurement Aperture, Nominal
    spd-note-note
    Note  

    When the aperture time is set to 2 power-line cycles (PLCs), measurement noise differs slightly depending on whether the niDCPower Power Line Frequency property or NIDCPOWER_ATTR_POWER_LINE_FREQUENCY attribute is set to 50 Hz or 60 Hz.

    Figure 4. Measurement Noise, 10 nA Range, No Load, 0 V, 3 m Cables, Nominal
    Figure 5. Measurement Noise, 10 nA Range, 1 GΩ Load, 9 V, 3 m Cables, Nominal
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    Note  

    Measurement noise vs. aperture plot measurements were taken with no load and no cabling. When using small aperture times, measurement noise may be impacted by system cabling.

    Sinking Power vs. Ambient Temperature Derating

    The following figure illustrates sinking power derating as a function of ambient temperature for the PXIe-4135.

    Figure 6. Sinking Power vs. Ambient Temperature Derating

    Output Resistance Programming Accuracy

    Table 4. Output Resistance Programming Accuracy
    Current Level/Limit Range Programmable Resistance Range, Voltage Mode Programmable Resistance Range, Current Mode Accuracy ± (% of resistance setting), Tcal ±5 °C[11]
    10 nA 0 to ±500 MΩ ±500 MΩ to ±infinity 0.03%
    1 μA 0 to ±5 MΩ ±5 MΩ to ±infinity
    100 μA 0 to ±50 kΩ ±50 kΩ to ±infinity
    1 mA 0 to ±5 kΩ ±5 kΩ to ±infinity
    10 mA 0 to ±500 Ω ±500 Ω to ±infinity
    100 mA 0 to ±50 Ω ±50 Ω to ±infinity
    1 A 0 to ±5 Ω ±5 Ω to ±infinity
    3 A[12] 0 to ±500 mΩ ±500 mΩ to ±infinity

    Overvoltage Protection

    Accuracy[13] (% of OVP limit + offset)

    1% + 200 mV, typical

    Temperature coefficient (% of OVP limit + offset)/°C

    0.01% + 3 mV/°C, typical

    Measurement location

    Local sense

    Maximum OVP limit value

    210 V

    Minimum OVP limit value

    2 V

    Extended Range Pulsing [14]

    Maximum pulse

    Voltage

    160 V

    Current

    3 A

    On time[15]

    1 ms

    Minimum pulse cycle time

    5 ms

    Energy

    200 mJ

    Cycle average power

    10 W

    Duty cycle

    5%

    Transient Response and Settling Time

    Transient response[16]

    3 A to 100 μA ranges

    <70 μs, typical

    1 μA range[17]

    <1 ms, typical

    10 nA range[17]

    <10 ms, typical

    Settling time[18]

    Voltage mode, 180 V step, unloaded[19]

    <500 μs, typical

    Voltage mode, 5 V step or smaller, unloaded[20]

    <70 μs, typical

    Current mode, full-scale step, 3 A to 100 μA ranges[21]

    <50 μs, typical

    Current mode, full-scale step, 3 A to 1 μA range[17], [21]

    <2 ms, typical

    Current mode, full-scale step, 3 A to 10 nA range[17], [21]

    <15 ms, typical

    The following figures illustrate the effect of the transient response setting on the step response of the PXIe-4135 for different loads.

    Figure 7. 1 mA Range, No Load Step Response, Nominal
    Figure 8. 1 mA Range, 100 nF Load Step Response, Nominal

    Load Regulation

    Voltage

    Device configured for local sense

    225 mV per A of output load change (measured between output channel terminals) , typical

    Device configured for remote sense

    100 μV per A of output load change (measured between sense terminals) , typical

    Current, device configured for local or remote sense

    Load regulation effect included in current accuracy specifications, typical

    Measurement and Update Timing Characteristics

    Available sample rates[22]

    (1.8 MS/s)/N where N = 1, 2, 3, … 224, nominal

    Sample rate accuracy

    Equal to PXIe_CLK100 accuracy, nominal

    Maximum measure rate to host

    1.8 MS/s per channel, continuous, nominal

    Maximum source update rate[23]

    100,000 updates/s, nominal

    Input trigger to

    Source event delay

    10 μs, nominal

    Source event jitter

    1 μs, nominal

    Measure event jitter

    1 μs, nominal

    Pulse timing and accuracy

    Minimum pulse on time[24]

    50 μs, nominal

    Minimum pulse off time[25]

    50 μs, nominal

    Pulse on time or off time programming resolution

    100 ns, nominal

    Pulse on time or off time programming accuracy

    ±5 μs, nominal

    Pulse on time or off time jitter

    1 μs, nominal

    Remote Sense

    Voltage accuracy

    Add 3 ppm of voltage range per volt of HI lead drop plus 1 μV per volt of lead drop per Ω of corresponding sense lead resistance to voltage accuracy specifications

    Maximum sense lead resistance

    100 Ω

    Maximum lead drop per lead

    3 V, maximum 202 V between HI and LO terminals

    spd-note-note
    Note  

    Exceeding the maximum lead drop per lead value may cause the driver to report a sense lead error.

    Safety Interlock

    The safety interlock feature is designed to prevent users from coming in contact with hazardous voltage generated by the SMU in systems that implement protective barriers with controlled user access points.

    spd-note-caution
    Caution  

    Hazardous voltages of up to the maximum voltage of the PXIe-4135 may appear at the output terminals if the safety interlock terminal is closed. Open the safety interlock terminal when the output connections are accessible. With the safety interlock terminal open, the output voltage level/limit is limited to ±40 V DC, and protection will be triggered if the voltage measured between the device HI and LO terminals exceeds ±(42 Vpk ±0.4 V).

    spd-note-caution
    Caution  

    Do not apply voltage to the safety interlock connector inputs. The interlock connector is designed to accept passive, normally open contact closure connections only.

    Safety interlock terminal open

    Output

    <±42.4 Vpk

    Setpoint

    <±40 VDC

    Safety interlock terminal closed

    Output

    Maximum voltage of the device

    Setpoint

    Maximum selected voltage range

    Examples of Calculating Accuracy Specifications[26]

    Example 1: Calculating 5 °C Accuracy

    Calculate the accuracy of 900 nA output in the 1 µA range under the following conditions:

    Ambient temperature 28 °C
    Internal device temperature within Tcal ±5 °C[27]
    Self-calibration within the last 24 hours

    Solution

    Because the device internal temperature is within Tcal ±5 °C and the ambient temperature is within 23 °C ±5 °C, the appropriate accuracy specification is the following value:

    0.03% + 200 pA

    Calculate the accuracy using the following formula:

    Accuracy = 900 nA * 0.03 % + 200 pA    = 270 pA + 200 pA

    = 470 pA

    Therefore, the actual output is within 470 pA of 900 nA.

    Example 2: Calculating Remote Sense Accuracy

    Calculate the remote sense accuracy of 500 mV output in the 600 mV range. Assume the same conditions as in Example 1, with the following differences:

    HI path lead drop 3 V
    HI sense lead resistance 2 Ω
    LO path lead drop 2.5 V
    LO sense lead resistance 1.5 Ω

    Solution

    Because the device internal temperature is within Tcal ±5 °C and the ambient temperature is within 23 °C ±5 °C, the appropriate accuracy specification is the following value:

    0.02% + 100 μV

    Because the device is using remote sense, use the following remote sense accuracy specification:

    Add 3 ppm of voltage range + 11 μV per volt of HI lead drop plus 1 μV per volt of lead drop per Ω of corresponding sense lead resistance to voltage accuracy specifications.

    Calculate the remote sense accuracy using the following formula:

    Accuracy = ( 500 mV * 0.02 % + 100 μV ) + 600 mV * 3 ppm + 11 μV 1 V of lead drop * 3 V + 1 μ V V * Ω * 3 V * 2 Ω + 1 μ V V * Ω * 2.5 V * 1.5 Ω    = 100 μV + 100 μV + 12.8 μV * 3 + 6 μV + 3.8 μV = 248.2 μV

    Therefore, the actual output is within 248.2 µV of 500 mV.

    Example 3: Calculating Accuracy with Temperature Coefficient

    Calculate the accuracy of 900 nA output in the 1 µA range. Assume the same conditions as in Example 1, with the following differences:

    Ambient temperature 15 °C

    Solution

    Because the device internal temperature is within Tcal ±5 °C, the appropriate accuracy specification is the following value:

    0.03% + 200 pA

    Because the ambient temperature falls outside of 23 °C ±5 °C, use the following temperature coefficient per °C outside the 23 °C ±5 °C range:

    0.0006% + 4 pA

    Calculate the accuracy using the following formula:

    Temperature Variation = ( 23 ° C 5 ° C ) 15 ° C = 3 ° C

    Accuracy = ( 500 nA * 0.03 % + 200 pA ) + 900 nA * 0.0006 % + 4 p A 1 ° C * 3 ° C

       = 350 pA + 28.2 pA

    = 378.2 pA

    Therefore, the actual output is within 378.2 pA of 900 nA.

    Trigger Characteristics

    Input triggers

    Types

    Start, Source, Sequence Advance, Measure, Pulse

    Sources (PXI trigger lines <0...7>)[28]

    Polarity

    Configurable

    Minimum pulse width

    100 ns, nominal

    Destinations[29] (PXI trigger lines <0...7>)[28]

    Polarity

    Active high (not configurable)

    Pulse width

    >200 ns, typical

    Output triggers (events)

    Types

    Source Complete, Sequence Iteration Complete, Sequence Engine Done, Measure Complete, Pulse Complete, Ready for Pulse

    Destinations (PXI trigger lines <0...7>)[28]

    Polarity

    Configurable

    Pulse width

    Configurable between 250 ns and 1.6 μs, nominal

    Protection

    Output channel protection

    Overcurrent or overvoltage

    Automatic shutdown, output disconnect relay opens

    Sink overload protection

    Automatic shutdown, output disconnect relay opens

    Overtemperature

    Automatic shutdown, output disconnect relay opens

    Safety interlock

    Disable high voltage output, output disconnect relay opens

    Isolation

    spd-note-caution
    Caution  

    Do not connect to MAINs. Do not connect to signals or use for the measurements within CAT II, III, or IV.

    Isolation voltage, channel-to-earth ground[30]

    Continuous

    250 VDC, CAT I

    Withstand

    1,000 VRMS

    spd-note-note
    Note  

    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, CAT III, or CAT IV.

    spd-note-warnings
    Hazardous Voltage  

    Take precautions to avoid electrical shock when operating this product at hazardous voltages.

    spd-note-caution
    Caution  

    Isolation voltage ratings apply to the voltage measured between any channel pin and the chassis ground. When operating channels in series or floating on top of external voltage references, ensure that no terminal exceeds this rating.

    Guard Output Characteristics

    Cable guard

    Output impedance

    3 kΩ, nominal

    Offset voltage

    1 mV, typical

    Calibration Interval

    Recommended calibration interval

    1 year

    Power Requirement

    spd-note-caution
    Caution  

    You can impair the protection provided by the PXIe-4135 if you use it in a manner not described in this document.

    PXI Express power requirement

    2.5 A from the 3.3 V rail

    2.7 A from the 12 V rail

    Physical Characteristics

    Dimensions

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

    Weight

    419 g (14.8 oz) , nominal

    Front panel connectors

    2 × 3 lug triaxial connectors, 1 × 4.08 mm (3 position) combicon

    Safety interlock connector

    3.55 mm (4 position)

    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.)[31]

    Storage Environment

    Ambient temperature range

    -40 °C to 70 °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-warnings
    Hazardous Voltage  

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

    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 The ambient temperature of a PXI system is defined as the temperature at the chassis fan inlet (air intake).
    • 2 Voltage levels and limits >|40 VDC| require the safety interlock input to be closed.
    • 3 Current is limited to 1 A DC. Higher levels are pulsing only.
    • 4 Power limit defined by voltage measured between HI and LO terminals.
    • 5 Accuracy is specified for no load output configurations. Refer to Load Regulation and Remote Sense sections for additional accuracy derating and conditions.
    • 6 Tcal is the internal device temperature recorded by the PXIe-4135 at the completion of the last self-calibration.
    • 7 Relative humidity between 10% and 70%, noncondensing up to 35 °C. Derate max relative humidity 3% per °C for ambient temperatures between 35 °C and 50 °C. From 50 °C to 55 °C, relative humidity between 10% and 25%, noncondensing.
    • 8 Add 30 pA to accuracy specifications when operating with relative humidity greater than 50%.
    • 9 Tcal is the internal device temperature recorded by the PXIe-4135 at the completion of the last self-calibration.
    • 10 3 A range above 1 A is for pulsing only.
    • 11 Tcal is the internal device temperature recorded by the PXIe-4135 at the completion of the last self-calibration.
    • 12 3 A range above 1 A is for pulsing only.
    • 13 Overvoltage protection accuracy is valid with an ambient temperature of 23 °C ± 5 °C and with Tcal ±5 °C. Tcal is the internal device temperature recorded by the PXIe-4135 at the completion of the last self-calibration.
    • 14 Extended range pulse currents fall outside DC range limits. In-range pulse currents fall within DC range limits. In-range pulses are not subject to extended range pulsing limitations.
    • 15 Pulse on time is measured from the start of the leading edge to the start of the trailing edge.
    • 16 Time to recover within 0.1% of voltage range after a load current change from 10% to 90% of range, device configured for fast transient response.
    • 17 Measured with guarded load and HI/Sense HI triax cable ≤ 3 m
    • 18 Measured as the time to settle to within 0.1% of step amplitude, device configured for fast transient response.
    • 19 Current limit set to ≥60 μA and ≥60% of the selected current limit range.
    • 20 Current limit set to ≥20 μA and ≥20% of selected current limit range.
    • 21 Voltage limit set to ≥2 V, resistive load set to 1 V/selected current range.
    • 22 When sourcing while measuring, both the niDCPower Source Delay and niDCPower Aperture Time properties affect the sampling rate. When taking a measure record, only the niDCPower Aperture Time property affects the sampling rate.
    • 23 As the source delay is adjusted, maximum source rates vary.
    • 24 Pulse on time is measured from the start of the leading edge to the start of the trailing edge.
    • 25 Pulses fall inside DC limits. Pulse off time is measured from the start of the trailing edge to the start of a subsequent leading edge.
    • 26 Specifications listed in examples are for demonstration purposes only and do not necessarily reflect specifications for this device.
    • 27 Tcal is the internal device temperature recorded by the PXIe-4135 at the completion of the last self-calibration.
    • 28 Pulse widths and logic levels are compliant with PXI Express Hardware Specification Revision 1.0 ECN 1.
    • 29 Input triggers can be re-exported.
    • 30 Verified with a 5-second dielectric withstand test.
    • 31 Accuracy specifications warranted for relative humidity between 10% and 70%, noncondensing up to 35 °C. Derate max relative humidity 3% per °C for ambient temperatures between 35 °C and 50 °C. From 50 °C to 55 °C, accuracy specifications warranted for relative humidity between 10% and 25%, noncondensing. See Current Programming and Measurement Accuracy/Resolution for humidity performance restrictions. When transitioning a device from a storage or operation environment with relative humidity outside of this range, device should be allowed to stabilize in the lower humidity environment for several hours before use.

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