BTC Z22 Manual do Utilizador descarregar pdf (Página 49)

Version 02.00, November 2014

Rohde & Schwarz R&S

BTC Broadcast Test Center 49

Analysis

Power measurements (R&S

BTC-K2055 option)

The power measurement requires the use of R&S

NRP-Zxx power sensors.

RF power measurements

measurements depend on power sensor

Power measurement

display

measured power

relative power

units

W, dBm, dBµV, selectable

Operating mode

auto

measurement frequency coupled to

RF frequency

user

user-selectable measurement frequency

Filter

auto

automatic setting of filter length

user

manual setting of filter length

optimization

auto once

length

0 to 128, settable

Range

frequency range

depends on the R&S

NRP-Zxx power

sensor being used

level range

dynamic range

Power sensors

connectors

USB, BNC female, front

calibration

zero

supported power sensors

R&S

NRP-Z11, R&S

NRP-Z21,

R&S

NRP-Z22, R&S

NRP-Z23,

R&S

NRP-Z24, R&S

NRP-Z51,

R&S

NRP-Z52, R&S

NRP-Z55,

R&S

NRP-Z91, R&S

NRP-Z92

BER measurements (R&S

BTC-K2060 option)

The bit error rate meter counts the errored bits in a data stream and displays the absolute error count and the relative error count

referenced to the total number of received bits. It is possible to analyze serial data streams or MPEG-2 transport streams.

At least one I/Q baseband generator (R&S

BTC-B1 option) is required for using the rear panel TS SERIAL IN or IP (1000BaseT)

interface.

BER measurements

for all digital modulation modes

Display

measured value

BER

error count

measurement time

Control

manual

start, restart, stop

Gating time

automatic

depending on bit error rate

user-defined

time window (1 s to 100 h), single run,

infinite

Logging

control

on/off/reset

text display, log file

all measured values and error events

PRBS measurements

Inputs for BER clock, BER data,

BER enable

connectors

BNC female, USER 4, 5, 6 on rear panel

input impedance

selectable, 1 kΩ or 50 Ω

input level

0 V to 3 V (nom.)

threshold

settable between 10 mV and 1.9 V

BER data

input data rate

up to 90 Mbit/s

PRBS

–1/2

–1 (in line with ITU-T O.151)

BER clock, BER data

polarity

normal, inverted

BER enable

always, active high, active low

MPEG-2 TS measurements

Input

input interfaces

ASI, SMPTE 310, IP (see “Digital

audio/video interfaces”)

input signal

TS packet

packet length

188, 204, 208

payload (PRBS in line with ITU-T O.151)

PRBS 2

–1/2

–1, constant 0x00/0xFF

PID

NULL (1FFF (hex)), settable (0 to

1FFF(hex)), don’t care

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