Calibrate the PXIe-6674T using Calibration Executive.

Calibration Executive Procedure Features

Verify Only Verify & Adjust Manual Mode Optional Adjust

Approximate Test Time

Warmup Verify Only Verify & Adjust
24 hours 1.5 minutes 7 minutes

Test Equipment

The following table lists the test equipment required for calibrating the PXIe-6674T.

Table 87. Test equipment for calibrating the PXIe-6674T
Instrument Recommended Model Requirements
10 MHz clock source Symmetricom/Datum 8040 Accurate to within 0.75 parts-per-billion (ppb)
BNC-SMA cable — —
PXI Express chassis PXIe-1062Q, PXIe-1075 Any PXI Express chassis meets requirements.

Test Conditions

The following setup and environmental conditions are required to ensure the PXIe-6674T meets published specifications.

  • Keep connections to the device as short as possible. Long cables and wires act as antennas, picking up extra noise that can affect measurements.
  • Verify that all connections to the device, including front panel connections, are secure.
  • Maintain an ambient temperature of 25 °C ±5 °C.
  • Keep relative humidity below 80%.
  • Ensure the PXIe-6674T has been continuously powered on for at least 24 hours.
  • Use shielded copper wire for all cable connections to the device. Use twisted-pairs wire to eliminate noise and thermal offsets.
  • Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters are clean, and that the empty slots contain filler panels. For more information, refer to the Maintain Forced-Air Cooling Note to Users document available at ni.com/docs.

Device Setup

  1. Install the PXIe-6674T board into any PXI Express slot of your PXI Express chassis. Refer to the NI PXIe-6674T Installation Guide for more details.
  2. Power on the PXI Express chassis.
  3. Configure the hardware using Measurement & Automation Explorer (MAX).
  4. Launch the Calibration Executive procedure. Calibration Executive guides you through the required connections.
Note The 10MHz reference clock should be connected directly to the chassis 10MHz Ref In. No connections will be made directly to the PXIe-6674T. This differs from the manual Calibration Procedure but is required for calibration to be performed in any slot within the chassis.

Test Limit Equations

The following test limits are derived from the published specifications.

Table 88. PXIe-6674T Test Limit Equations
Equation Type Equation
Timing Accuracy 1 year limits are calculated as follows:
  • Limit = Retrace Error + Long Term Stability + Stability vs. Temperature = ±56.5 ppb for one year specs
  • Retrace Error = ±1.5 ppb
  • Long Term Stability = ±50 ppb/year
  • Stability vs. Temperature = ±5 ppb, referenced at 25 °C