Atec Agilent-E4406A - Manual (Page 14)

14
Modulation accuracy (rho) measurement
Rho is a measure of the performance of a cdmaOne
transmitter’s modulation circuitry. Rho can be measured for
a base station only when a pilot is the only active channel.
Rho can be measured for a reverse channel offset-QPSK
signal when the data is all zeros going into the short code
spreading. Error vector magnitude, time offset, frequency
error, and carrier feedthrough are also measured and
reported.
Power range at RF input +30 to –40 dBm
Measurement interval 0.25 to 30 ms
range
Rho (waveform quality) (usable range 0.5 to 1.0)
Range 0.9 to 1.0
Accuracy ±0.005
Resolution 0.0001
Frequency error (frequency error excludes instrument
time base error)
Input frequency ±900 Hz
error range
Accuracy ±10 Hz +
(transmitter frequency x
frequency reference accuracy)
Resolution 0.1 Hz
Pilot time offset (from even second signal to start
of PN sequence)
Range –13.33 to +13.33 ms
Accuracy ±250 ns
Resolution 10 ns
EVM
Floor 2.5% (1.8%, typical)
Accuracy ±0.5%
Resolution 0.1%
Carrier feedthrough
Accuracy ±2.0 dB
Resolution 0.1 dB
Magnitude error
Accuracy ±0.5%
Resolution ±0.01%
Phase error
Accuracy ±1.0 degrees
Resolution 0.1 degrees
Displays Metric summary, magnitude
error versus chips, phase error
versus chips, EVM versus chips,
I/Q measured polar graph
Adjacent channel power ratio measurement
Power range at RF input +30 to –20 dBm
Dynamic range (referenced to average power of carrier in
1.23 MHz BW)
Offset frequency Integ BW Dynamic range
750 kHz 30 kHz –82 dBc
885 kHz 30 kHz –82 dBc
1.25625 MHz 12.5 kHz –86 dBc
1.98 MHz 30 kHz –85 dBc
2.75 MHz 1 MHz –56 dBc
Relative accuracy ±0.9 dB
Resolution 0.01 dB
Spurious close measurement
(at transmitter maximum power)
Spurious close measures the spurious emissions in the
transmit band relative to the channel power in the selected
channel. The unit under test is typically set for the maxi-
mum output power.
Carrier power range at +30 to –30 dBm
RF input
Minimum spurious –70 dBm (30 kHz RBW)
emission power
sensitivity at RF input
Absolute accuracy for ±1.0 dB
in-band signal
Relative accuracy ±1.0 dB
Resolution 0.01 dB
Demod sync
Even second input Level and impedance same as
external trigger
PN offset range 0 to 511 x 64 (chips)
In-band frequency range
IS-95 824 to 849 MHz
869 to 894 MHz
J-STD-008 1850 to 1910 MHz
1930 to 1990 MHz