Anritsu S331C - Manual (Page 67)

Step 10. Press the MEAS key to initiate actual measurement. The Site Master will display
the measurement results in the display area.
The Site Master default value for the % method is 99%, and N dBc down is 3 dB
down.
The table below provides typical instrument settings for measuring a CW and an
IS-95 CDMA signal.
Channel Power Measurement
One of the most common measurements for a transmitter is that of channel power. This test
measures the output power, or channel power, of a transmitter over a frequency range and a
specific time interval. Channel Power measurements are used to validate transmitter perfor-
mance, verify compliance with FCC regulations, and keep overall system interference at a
minimum.
Out-of-specification power measurements indicate system faults in the power amplifier or
in-filter circuits.
Channel Power Measurement with the Site Master
The Site Master can be used to measure CDMA signals in terms of channel power. It is nec-
essary to use precise and specific settings to accurately measure the CDMA signal because
the CDMA is different from CW signals.
For accurate IS-95 CDMA measurements, use the following settings:
q CDMA Channel Bandwidth: 1.23 MHz
q RBW setting: 10 kHz
q VBW
³ 3´ RBW or at least 30 kHz
q Averaging function turned off
Required Equipment
q Site Master Model S114C or S332C
q 30 dB, 50 Watt, bi-directional, DC –18 GHz, N(m) – N(f), Attenuator
q Test Port extension cable, Anritsu 15NNF50 – 1.5C
5-2
Chapter 5 Spectrum Analyzer Measurements
CW Wave IS-95 CDMA Signal
Frequency Span 900 MHz 900 MHz
Reference Level –15 dBm –10 dBm
Input Attenuation Level Auto Auto
Resolution Bandwidth Auto 10 kHz
Video Bandwidth Auto 30 kHz
Table 5-1. Typical Occupied Bandwidth Measurement Settings