PowerXpert™ Help : Verifying MA245xxA Performance : Frequency Response Test
 
Frequency Response Test
The frequency response of the Power Master is tested at one low power level against a reference power sensor or Power Master of known measurement uncertainty. The reference power sensor or Power Master should be calibrated by a reputable standards laboratory using instruments with low published measurement uncertainty values. To perform the comparison, both power sensors or Power Masters are used to measure the output power of a synthesizer with a high quality attenuator at the output. The attenuator improves the source match of the synthesizer by lowering the mismatch ripples, thereby lowering the uncertainty in the comparison.
Test Procedure
1. Set up the equipment as follows (refer to Figure: MA245xxA Power Master < 67 GHz Frequency Response Setup for an illustration and Table: Required Equipment for MA24507A Power Master for the required equipment):
a. Preset all test equipment.
b. Reference power sensor and power meter (if needed). Not shown in the Figure: MA245xxA Power Master < 67 GHz Frequency Response Setup.
c. Connect the USB cable between the computer and MA245xxA Power Master.
d. Launch the PowerXpert application.
e. Power up all test equipment for the amount of time specified in their manuals.
f. Connect the attenuator to the synthesizer with appropriate adapter (if required).
g. Connect the reference sensor to the attenuator.
h. Turn Off synthesizer RF output.
.
MA245xxA Power Master < 67 GHz Frequency Response Setup
Index
Description
1
Synthesizer
2
10 dB Attenuator
3
Adapter
4
PC with Anritsu PowerXpert Application
.
MA24510A Power Master 71 to 110 GHz Frequency Response Setup
Index
Description
1
Synthesizer
2
Frequency Multiplier
3
PC with Anritsu PowerXpert Application
2. Set synthesizer power to 5 dBm and frequency to 50 MHz CW. Turn On RF output.
3. Apply the Cal Factor to the reference sensor.
4. Record the power indicated by the reference meter or virtual power meter software in Table: MA245xxA Power Master Test Measurement Results.
5. Set synthesizer frequency to the next frequency in Table: MA245xxA Power Master Test Measurement Results.
6. Repeat Steps 3 through 6 until all frequencies are measured.
7. Turn Off RF output. Disconnect the reference sensor and connect MA245xxA Power Master to the attenuator.
8. Set synthesizer frequency to 50 MHz CW. Turn On RF output.
9. Set to Continuous Mode: Mode = Channel power, Span = 1MHz, Units =dBm, Range = Upper, Averages = 64
10. Enter test frequency in GHz on PowerXpert.
11. Record the power indicated by the MA245xxA Power Master.
12. Set synthesizer frequency to the next frequency.
• Note: The frequency multiplier doubles the frequency, so the synthesizer frequency must be set to 1/2 the test frequency with the 71 to 110 GHz setup.
13. Repeat Steps 10 through 13 until all frequencies are measured.
14. Calculate the absolute difference between the Reference power and MA245xxA Power Master measurement.
15. Compare the power difference to the maximum allowed difference specified. If the difference exceeds the maximum allowed difference, contact Anritsu Customer Service.
 
MA245xxA Power Master Test Measurement Results 




Frequency
(GHz)
A


Reference Power Measurement
(dBm)
B


MA245xxA Measurement
(dBm)
|A-B|

Absolute Value of
Difference in Power
Measurements
(dB)

MA245xxA
Maximum
Allowed
Difference
(dB)
0.05
 
 
 
1.3
1.0
 
 
 
1.8
5.0
 
 
 
1.8
10.0
 
 
 
1.8
20.0
 
 
 
1.8
30.0
 
 
 
1.8
40.0
 
 
 
1.8
50.0
 
 
 
2.0
60.0
 
 
 
2.0
67.0
 
 
 
2.0
71.0
 
 
 
2.2
89.0
 
 
 
2.2
109.0
 
 
 
2.5