Anritsu MG3641A User Manual

SECTION 5 MEASUREMENT

5-3

5.1.2

Measuring 12 dB SINAD sensitivity

The SINAD sensitivity is indicated by the output level of the signal generator when the distortion rate reaches the

determined value (–12 dB in the 400 MHz zone of Japan) by reducing the output level of the signal generator while

measuring the distortion (correctly distortion + noise) of the receiving modulation output of the typically modulated

signal.

(1) Setup

Fig. 5-2. Measuring 12 dB SINAD Sensitivity

(2) Measurement procedure

STEP

PROCEDURE

Set the MG3641A/MG3642A frequency to 465.05 MHz.

Set the MG3641A/MG3642A frequency deviation to 70 % (3.5 kHz for maximum frequency deviation 5

kHz) of the specified maximum frequency deviation. Then, set the internal modulation frequency to 1 kHz.

Set the MG3641A/MG3642A to a sufficiently high output (ordinarily 30 dB

µ or more) and apply it to the

receiver.

Turn off the squelch of the receiver, synchronize the receiver with receiving frequency 465.05 MHz (so that

the reading value of the distortion rate and noise meter is the maximum), then adjust the volume adjust

volume of the receiver so that the rated output of the receiver is obtained according to the indicator of the

distortion rate and noise meter.

Adjust the MG3641A/MG3642A output level so that the indicator of the distortion rate and noise meter is

set to –12 dB.

The reading value of the MG3641A/MG3642A output level indicator is a 12 dB SINAD sensitivity in step

MG3641A/MG3642A

FM RX

(465.05MHz)

Pseudo-

antenna

receiver

Standard

pseudo-load

Distortion rate

and noise meter