Anritsu AWGN MU368060A - Manual (Page 29)

5.1 Calibration of the Output Level
5-3
<Points>
In this calibration method, the output level accuracy of this unit can be ig-
nored because the output level is directly measured by the power meter.
Conversely, by changing the output level of this unit after calibration, its
accuracy affects the level accuracy. The output level accuracy applies be-
cause the step accuracy (relative accuracy) of the output level is not speci-
fied for this unit. In this case, the noise level accuracy is the sum of the
level accuracy of this unit and the power meter accuracy.
5.1.2 Adjusting the level at the input connector terminal of the receiver
Calibration of the noise level at the input connector terminal of the receiv-
er is explained here.
A sample power setting with a 7.68 MHz noise signal bandwidth and –73
dBm/3.84 MHz at the input connector terminal of the receiver is shown
below.
<Calibration procedure>
(1) Set the following parameters for this unit.
Digital Mod : On
System : Noise1
Noise Bandwidth : 7.68 MHz
Calculate Bandwidth : 3.84 MHz
(2) Calculate the total noise power for –73 dBm/3.84 MHz.
Read the Calculated Level on the display. With the parameter set in
Step (1), this value should be –3.45 dBm. Figure out the total noise
power using the formula below:
Total power = –73 dBm – (–3.45 dB) = –69.55 dBm
(3) Set the RF output for the desired frequency signal generator to Off
and then connect the power meter to the input connector terminal of
the receiver.
A
Anritsu POWER METER ML4803A
Wanted signal source
Noise signal source
Receiver
Anritsu MA1612A
LOS S 15.0dB IMPEDANSE 50 Ω MAX POWER 1W A