17 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview

Phase and amplitude versus time (PAvT)

measurement

Optional PAvT measurement, requires separate license, orderable

as part number E1968A-410.

All specifications for the PAvT measurement are valid between

+20 and +55 °C.

Types of signals

measured

CW only – discrete amplitude step waveform or

continuous ramp waveform

Waveform type

Discrete or continuous

Trigger sources

RF rise, immediate, external

Trigger delay

Settable between 0 to 10 ms

Trigger threshold

Settable between 0 to 30 dB

Measurement timeout

Settable between 0.1 to 999.9 s

Continuous

measurement count

Settable between 1 to 5000

Continuous

measurement delay

Settable between 0 to 500 ms

Discrete step width

Settable between 0.1 to 400 ms

Discrete step count

Settable between 1 to 512

Discrete step center

Settable between 0.05 to 399.95 ms

Concurrency capabilities PAvT measurements cannot be made

concurrently with any other measurements

Fast device tune (FDT) measurement

Optional FDT measurement requires separate license, orderable

as part number E1999A-202.

All specifications for the FDT measurement are valid for the

frequency ranges 450 to 496 MHz, 740 to 960 MHz, and 1700 to

1990 MHz.

FDT transmit power measurement specifications

Input signal conditions

First slot has to be the highest burst, and

power level of first timeslot has to be within ± 3

dB of expected power

Multislot signal

measurement capability

Measurement of up to seven timeslots

Minimum input level

For warranted performance, the signal at the

test set’s RF IN/OUT must have transmit power

> –14 dBm for first timeslot, and ≥ –25 dBm for

second to seventh timeslot

Measurement accuracy for FDT GMSK transmit

power at RF IN/OUT port between +20 and

+55 °C

Accuracy (dBm)

Ranges

< ± 0.85

700 to 800

810 to 960

< ± 0.87

450 to 496

1700 to 1990

FDT (downlink) generator specifications

FDT absolute output level accuracy with GMSK modulation on:

Specification

Ranges

< ± 2.10 dB

Single slot from –110 to –13 dBm

< ± 2.10 dB

1 multislot level between –110 and –13 dBm

< ± 2.50 dB

2 multislot levels ≤ 20 dB apart

Peak phase error

< ± 5 degrees

Frequency error

< ± 0.02 ppm plus timebase reference

Typical burst modulation

on/off ratio (referenced

to lowest signal level)

> 50 dB

Typical RMS phase error < 0.9 degree

Supplemental characteristics

Typical FDT absolute output level accuracy with GMSK

modulation on:

Specification

Ranges

< ± 1.40 dB

Single slot from –110 to –13 dBm

< ± 1.40 dB

1 multislot level between –110 and –13 dBm

< ± 1.70 dB

2 multislot levels ≤ 20 dB apart

Frequency capture range Signal must be within ± 70 kHz of test set’s

expected frequency for warranted performance

VSWR at RF IN/OUT

< 1.14 : 1 for 450 to 496 MHz and 700 to

960 MHz, < 1.2 : 1 for 1.7 to 1.99 GHz

Trigger sources

Fixed as protocol trigger (RF rising trigger for

the first step)

Trigger delay

± 2.31 ms

Concurrency capabilities Fast device tune measurements cannot be

made concurrently with other measurements

Supplemental characteristics

Typical measurement accuracy for FDT GMSK transmit power at

RF IN/OUT port between +20 and +55 °C:

Accuracy (dBm)

Frequency (MHz)

< ± 1.40

700 to 800

810 to 960

< ± 0.41

450 to 496

1700 to 1990

Typical measurement

repeatability

< ± 0.05 dB

Measurement resolution 0.01 dB