Anritsu S331C, S113C, S332C, S114C manual Channel Power Measurement with the Site Master

Chapter 5 Spectrum Analyzer Measurements

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.

Table 5-1. Typical Occupied Bandwidth Measurement Settings

	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

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:

￿CDMA Channel Bandwidth: 1.23 MHz

￿RBW setting: 10 kHz

￿VBW ￿ 3￿ RBW or at least 30 kHz

￿Averaging function turned off

Required Equipment

￿Site Master Model S114C or S332C

￿30 dB, 50 Watt, bi-directional, DC –18 GHz, N(m) – N(f), Attenuator

￿Test Port extension cable, Anritsu 15NNF50 – 1.5C

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