User's Manual Part 2

T ECHNICAL D OCUMENTATION P ROTECTING P EOPLE AND A SSETS
®
D ATE : 22 M ARCH 2017 | V ERSION : 1.4
84
R ANGER -X5 R ADAR S YSTEM
T
ROUBLESHOOTING
,
M
AINTENANCE
,
AND
C
ALIBRATION
EEC
®
|
C
OMPANY
P
ROPRIETARY
5. Depress the calibrate button.
6. If the returned value and the expected values are different use the mouse to highlight the
difference in the table then depress the correct button.
7. Depress the run button once again.
8. Repeat steps 2 through 7 for the remaining pulse widths.
9. Using the calibration window, select Range from the calibration window. Enter Range
20km. Click ‘Calibrate’ to start the test.
10. Follow the on screen prompts to set the signal levels.
11. At the completion of the Calibration Save and Print the image.
12. Attached the hardcopy image to the Test Procedure. An example of a typical calibration
result is shown in Figure 15. The green markers on the receiver response curve indicate
the calculated (expected value) and the actual returned value are within the specified
range.
13. Complete Table 13 using the Calibration graph documents produced by the Calibration
utility by entering the final calibration corrections factors and the measured linear dynamic
range.
14. Verify that the calibrated zcal value is automatically or manually updated in the EDGE
configuration file config.rex or using the EDGE configuration miscellaneous interface.
15. After completing the calibration and dynamic range verification utilize the EDGE
calibration utility to calculate the signal level required to simulate a weather target with a
reflectivity value of 13.5 dBz at the range selected for calibration (typically 20km). The
mode of operation should be set to 2usec with a bandwidth of 0.5 MHZ prior to performing
the calculation.
16. Use the calibrated signal generator to inject the signal level taken from the calibration
chart for 13.5 dBz (~0.3mm/hr). Pulse mode is recommended with the pulse centered on
the same range as used for calibration (typically 20 KM)
17. Slowly adjust the signal level and verify that when the power level needed to simulate
13.5 dBz of signal is reached that the signal is still easily detectable on the ascope display.
18. Change the ascope display to the rain rate mode and verify that a signal level of 0.3mm/hr
is also easily observed at the same range.
19. Repeat the sensitivity test for the vertical channel using the same pulsewidth selection
(2usec/BW 0.5MHZ).
20. Log the sensitivity test results in Table 13.
Pulsewidth (µs)
Measured Dynamic Range (dB)
Calibration Correction Factor
(dBz0/ZCal)
H(Horizontal)
V (Vertical)
H(Horizontal)
V (Vertical)
2.0
20.0
50.0
100.0
Noise
Figure Data from LNA
Datasheet (dB)
≤ 2.5 dB
≤ 2.5 dB
Hard Copies
of
Calibration
Verification are Attached

Yes
 No

Yes
 No
13.5 dBz sensitivity Achieved

Yes
 No

Yes
 No
0.3 mm/hr. sensitivity
achieved

Yes
 No

Yes
 No
Table 13. Receiver Noise Figure and Dynamic Range Test Results