Appendix C _____________________________________________ Installation and Test Procedures
VAISALA______________________________________________________________________ 393
C.25 RVP901 TxDAC Stand-alone Bench Test
Test Goal
Verify that the RVP901 TxDAC electrical I/O is working properly in an
isolated environment.
Special Test Equipment
- IRIS dspx utility
- IF signal generator
-Voltmeter
Test Procedure
1. Begin by running dspx and temporarily reverting to factory settings
with "f".
2. In the Mb menu, choose an Intermediate Frequency that matches the
RVP901 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
3. Enter the Pr menu and type “RRRTTZ” to move the starting plot range
to 30 km, the plot interval to 20 msec, and zoom factor to x2.
4. Type two space characters to switch to the spectral display plot and
exit the plot for now with “q”.
5. Setup the following in the Mz menu:
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.
6. Connect the RVP901 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.
7. 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.
8. Repeat the steps 5 through 7 on the TxDAC-B output port.
9. Apply a 0 dBm SigGen waveform at the selected reference frequency
(for example, 10 MHz) to the CLK IN BNC input of the RVP901.
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