IFDR10 TxDAC Stand-alone Bench Test

Test Goal

Verify that the IFDR10 TxDAC electrical I/O is working properly in an isolated environment.

Test Equipment

IRIS dspx utility

IF signal generator

Test Procedure

1. Enter the TTY setups through dspx.
2. Run dspx and temporarily revert to factory settings with f.
3. In the Mb menu, choose an intermediate frequency that matches the IFDR10 analog output filters (for example, 60 MHz) and a Blackman window.

   Receiver Intermediate Frequency: 60.0000 MHz
   Design/Analysis Window– 0:Rect, 1:Hamming, 2:Blackman : 2

4. Enter the Pr menu and type RRRTTZ to move the starting plot range to 30 km, the plot interval to 20 μsec, and zoom factor to x2.
5. Type 2 space characters to switch to the spectral display plot and exit the plot by typing: q

6. In the Mz menu, setup the following:

   Chan A – 0:Unused, 1:FixedFreq : 1, 2:TxWaveform: 1 
   FreeRunning fixed frequency : 60.00000 MHz
   Output power level : 0.0 dBm
   Apply pulse–to–pulse phase modulation: NO 
   Fixed relative phase offset : 0.000 Deg

   The output frequency should match the IF previously set in Mb.

7. Connect the IFDR10 TxDAC-A output to the ADC-A port of the IFD. It should be connected directly to the IFDR SMA input connector; not through any bandpass filter.
8. Verify the plot shows a single strong spectral line at the selected Intermediate Frequency, and that any spurious signals are down at least 60 dB.
9. Repeat the steps 5 to 8 on the TxDAC-B output port.
10. Apply a 0 dBm SigGen waveform at the selected reference frequency (for example, 10 MHz) to the CLK IN BNC input of IFDR10.
11. Verify the V command shows Tx/Clk:Okay, indicating the IFDR10 DAC is locking properly.
12. Return to the center frequency and verify that lock returns.

Checklist