Atec TDEMI40G User Manual

TDEMI 40G

- 162.5 MHz full real-time analysis bandwidth up to 40 GHz

- Measurement according to MIL and DO standards starting from 10 Hz

- 4000x faster than conventional EMI

receivers

The TDEMI 40G system covers the frequency range 10 Hz to 40 GHz in its standard conguration and is ready for measurements in civil applications and especially for testing in military applications and also avionics. All IF bandwidths according to MIL461 and DO160 are available in the preselected spectrogram mode of the instrument also. The fully gapless real-time analysis bandwidth of

162.5 MHz of the spectrogram mode up to 40 GHz makes

the TDEMI 40G unique in the instrumentation market and provides an ideal tool for real-time EMC debugging up to 40 GHz. It supports the user in detecting, localizing, observing and analyzing emissions and in nding solutions for reduction EMI of components and systems for military and avionic industry.

The receiver mode of the TDEMI 40G system can be used for full compliance EMC tests according to CISPR, MIL461 and DO160 standard. The huge computation power of the digital signal processing unit of the TDEMI allows to reduce test time up to a factor of 4000 in comparison to traditional superheterodyn based receivers. A fast measurement at all frequencies and with higher frequency selectivities at the same time can be performed yielding in a reduced measurement uncertainty.

eral thousand receivers using the short-term fast Fourier transform (STFFT) allows the TDEMI to reduce the overall testing time signicantly. Especially for longer dwell times the scan time remains very short compared to superheterodyne EMI receivers and right after the results are measured at all frequencies all the data can be stored and documented. Thus, it is easily possible to reduce the measurement uncertainty even further by increasing the dwell time, which means a longer observation time at each frequency point. But not only broadband, also single frequencies can be measured in the same way. For a higher sensitivity in the upper frequency range the instrument comes with a broadband preselected low noise amplier already integrated in its standard conguration.

Especially in the lower frequency range up to several hundred MHz a large number of frequency points have to be measured. The parallel digital implementation of sev-

Fig. 32 – Measurement of a switched power supply according to DO160.

Measured emissions above limit line for peak detector in band B.

TDEMI 40G Specications

FREQUENCY RANGE

10 Hz – 40 GHz

REFERENCE (OCXO)

Aging < ± 3.5 ppm / 15 years Temperature Drift (0 .. 60° C) ± 1 x 10e-8 SSB Phase Noise (1 Hz BW) 1 Hz (typ. @ 12.8 MHz) 10 Hz -120 dBc/Hz

RECEIVER MODE (CISPR Standard)

IF Bandwidth 200 Hz Band A

IF Filter: Gaussian Shaped Filter, Specications according to CISPR 16-1-1, Bandwidth Deviation < 10 %

Displayed Average Noise Level (Input Level < 85 dBμV Sinus): < 0 dBμV (typ. -3 dBμV) Measurement at about 700 Frequencies in parallel Frequency Step < 100 Hz

IF Bandwidth 9 kHz

IF Filter: Gaussian Shaped Filter, Specications according to CISPR 16-1-1, Bandwidth Deviation < 10 %

Displayed Average Noise Level (Input Level < 65 dBμV Sinus): < -15 dBμV (typ. -19 dBμV) Measurement at 4096 Frequencies in parallel Frequency Step < 400 Hz

IF Bandwidth 120 kHz

IF Filter: Gaussian Shaped Filter, Specications according to CISPR 16-1-1, Bandwidth Deviation < 10 %

Displayed Average Noise Level (Input Level < 65 dBμV Sinus): < -3 dBμV (typ. -6 dBμV) Measurement at 1024 Frequencies in parallel Frequency Step < 800 Hz

IF Bandwidth 1 MHz

IF Filter: Gaussian Shaped Filter, Specications according to CISPR 16-1-1, Bandwidth Deviation < 10 %

Displayed Average Noise Level (Input Level < 65 dBμV Sinus): < 6 dBμV 1 MHz – 1 GHz < 8 dBμV 1 GHz – 1.15 GHz < 3 dBμV 1.15 GHz – 6 GHz < 15 dBμV 6 GHz - 18 GHz Measurement at 128 Frequencies in parallel Frequency Step < 800 Hz

RECEIVER MODE (MIL/DO Standard)

IF Bandwidth 10 Hz (10 Hz - 10 kHz)