16-2
Measurement Theory
Introduction
Introduction
This chapter describes which blocks of the instrument are used in the various
measurements. The measurements described include the following:
• BIT ERROR
• DSP ANL
• OUT RF SP
• PULSE
• CW MEAS/AF ANL
• SCOPE
• SPEC ANL
Thedescriptions are given in terms of which path the signal under test takes from the front
panel to the measurement point. This chapter does not describe how a radio under test is
stimulated to output the signals that are being measured.
BIT ERROR
• A23 Input
• A11 Receiver Mixer
• A16 Receiver
• A9 Global Test and Demod
• A31 CODEC
The bit error test is a test where a known data pattern is sent to the radio under test and is
looped back to measure how many errors are generated by the radio under test through
receiving and transmitting the same data. The Bit Error test signal is routed through the
front-paneland through the RF hardware. The signal is demodulated at the A9 Global Test
andDemod assembly. After the signal is demodulated the recovered clock and data signals
are routed to the A31 CODEC assembly. The A31 CODEC assembly both generates the
testdata pattern and does the comparison after the data is recovered after being transmitted
andreceived. After the measurement is done the measurement numbers are sent to the A7
controller to be sent to the display section.