Table Of Contents

Measurement and Update Timing Characteristics

Version:
    Last Modified: November 30, 2020

    Available sample rates[1]

    (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[2]

    Sequence mode

    100,000 updates/s (10 μs/update), nominal

    Timed output mode

    80,000 updates/s (12.5 μs/update), nominal

    Input trigger to

    Source event delay

    10 μs, nominal

    Source event jitter

    1 μs, nominal

    Measure event jitter

    1 μs, nominal

    Shutdown[3]

    100 μs, typical

    Pulse mode timing and accuracy[4]
    Minimum pulse on time[5]

    PXIe-4139 (40W)[6]

    10 μs, nominal

    PXIe-4139 (20W)

    50 μs, nominal

    Minimum pulse off time[7]

    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

    • 1 When sourcing while measuring, both the Source Delay and Aperture Time affect the sampling rate. When taking a measure record, only the Aperture Time affects the sampling rate.
    • 2 As the source delay is adjusted or if advanced sequencing is used, maximum source rates vary. Timed output mode is enabled in Sequence Mode by setting the Sequence Step Delta Time Enabled to True. Additional timing limitations apply when operating in pulse mode (Output Function is set to Pulse Voltage or Pulse Current).
    • 3 Time from PXI Trigger sent until SMU output goes to high impedance.
    • 4 Pulse mode is enabled when the Output Function is set to Pulse Voltage or Pulse Current. This mode enables access to extended range pulsing capabilities. For PXIe-4139 (20W), shorter minimum on times for in-range pulses can be achieved using Sequence mode or Timed Output mode with the Output Function set to Voltage or Current.
    • 5 Pulse on time is measured from the start of the leading edge to the start of the trailing edge. See Figure 1.
    • 6 Optimize transient response, overshoot, and slew rate with NI SourceAdapt by adjusting the Transient Response.
    • 7 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.

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