E6835A Просмотр технического описания (PDF) - HP => Agilent Technologies
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E6835A Datasheet PDF : 4 Pages
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Error vector magnitude (EVM) measurement
This measurement calculates composite EVM and several other
results relating to UE modulation quality.
Input level range
Average power
–25 to +28 dBm/1.28 MHz
UE ranges
EVM
Frequency error
Timing error
≤ 20% rms
< ±20 kHz
< ±25 chips
EVM measurement accuracy
(Includes residual EVM) < ±2.5% rms
Filter
1.28 MHz (RRC)
Measurement results
EVM, magnitude error, phase
error, origin offset
Frequency error measurement
This measurement measures the difference between the carrier
frequency transmitted from the UE and the expected frequency.
The UE uses the same frequency source for both RF frequency
generation and the chip clock.
Input level range
Average power
UE ranges
EVM
Frequency error
Timing error
Measurement accuracy
Filter
Measurement results
–25 to +28 dBm/1.28 MHz
≤ 20% rms
< ±20 kHz
< ±25 chips
< (±10 Hz + timebase accuracy)
1.28 MHz (RRC)
Frequency error
Peak code domain error (PCDE) measurement
This measurement is computed by projecting power of the
error vector onto the code domain at a specific spreading
factor. The code domain error for every code in the domain
is defined as the ratio of the mean power of the projection
onto that code, to the mean power of the composite reference
waveform. This ratio is expressed in dB. The PCDE is defined
as the maximum value for the code domain error for all codes.
Input level range
Average power
UE ranges
EVM
Frequency error
Timing error
Measurement accuracy
Filter
Measurement results
–25 to +28 dBm/1.28 MHz
≤ 20% rms
< ±20 kHz
< ±25 chips
< ±0.3 dB
1.28 MHz (RRC)
Maximum value of CDE
Dynamic Power Measurement
This measurement provides a fast and flexible method for
calibrating the power accuracy of a wireless device by providing
multiple Tx power measurements at a single frequency. It tracks
and reports the power result for each step. To take advantage
of this measurement capability, the wireless device must have
a test mode that outputs an appropriate power ramp at each
frequency with the expected number of steps and dwell time
at each step (step length).
Input level range
Average power
–65 to +28 dBm/1.28 MHz
Amplitude capture range
With 7 dB crest factor
< ±2 dB of expected power
Measurement accuracy1
+2 to –42 dB of expected power
–54 to +28 dBm/1.28 MHz < ±0.6 dB, typically < ±0.3 dB
–61 to < –54 dBm/1.28 MHz < ±0.7 dB, typically < ±0.4 dB
+2 to –42 dB of expected power
With < 48 hours warm-up before self alignment initiated
–54 to +28 dBm/1.28 MHz < ±0.7 dB, typically < ±0.3 dB
–61 to < –54 dBm/1.28 MHz < ±0.8 dB, typically < ±0.4 dB
Measurement repeatability Typically < ±0.05 dB
Trigger setup
Sources
External, fall, rise
Step Length and Number of Steps parameters are coupled to
the setting of the Filter:
Filter
1 kHz
30 kHz
100 kHz
300 kHz
640 kHz
1.23 MHz
1.28 MHz
1.6 MHz
3.84 MHz
5.0 MHz
8PSK estimated
carrier power
GSM Tx power
W-CDMA
mean power)
Step length (SL)
0.5 to 180 ms
0.25 to 180 ms
0.1 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
0.575 to 20 ms
0.1 to 20 ms
0.1 to 20 ms
Number of steps
1 to (1048000/(21973 x SL))
1 to (1048000/(60e3 x SL))
1 to (1048000/(250e3 x SL))
1 to (1048000/(600e3 x SL))
1 to (1048000/(1.28e6 x SL))
1 to (1048000/(2.46e6 x SL))
1 to (1048000/(2.56e6 x SL))
1 to (1048000/(3.2e6 x SL))
0.1 to (1048000/(7.68e6 x SL))
0.1 to (1048000/(10e6 x SL))
1 to 1047800/(1.0833e6 x SL)
1 to (1048000/(320e3 x SL))
1 to (1048000/(5.25e6 x SL))
Measurement result
A graph displaying the discrete power at each power step along
with numeric power results for each step
1. Additional accuracy error when using RF OUT ONLY port is < ±0.1 dB.
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