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

General-purpose spectrum monitor

Operating modes

Active cell and test mode

Measurement modes

Swept mode or zero span

Frequency ranges

Although the spectrum monitor is available at

any frequency supported by the test set, spec-

ifications apply only inside of the calibrated

bands: 450 to 496 MHz, 700 to 800 MHz, 810

to 960 MHz, and 1.7 to 1.99 GHz

Frequency spans,

resolution bandwidth,

displayed dynamic

ranges

Coupled, with the following combinations

available

Displayed average noise

level

< –90 dBm for reference level of –40 dBm and

30 kHz bandwidth

Typical residual

responses

< –70 dB with input terminated, reference level

of –10 dBm and RF generator power < –80 dBm

Typical spurious

responses

< –50 dBc with expected frequency tuned to

carrier, carrier > 420 MHz, signal and reference

level at –10 dBm and all spectral components

within 100 MHz of carrier

Frequency resolution

1 Hz

Marker amplitude

resolution

0.01 dB

RBW filter types

Flattop in swept mode, Gaussian in zero span

Zero span sweep time

Settable from 50 μs to 70 ms

Zero span offset time

Settable from 0 to 10 s

Reference level range

Settable from –50 to +37 dBm, or automatically

determined

Amplitude scaling

Settable from 0.1 to 20 dB/division in 0.1 dB

steps

Trigger source

Immediate, protocol, RF rise, external, auto

Trigger delay

Settable between ± 50 ms

Peak threshold

Settable from –120 to +37 dBm

Peak excursion

Settable between 1.2 to 100 dB

Trace functions

Clear write, max hold, min hold

Detector type

Peak or sample

Averaging capabilities

Settable between 1 and 999, or off

Marker functions

Three independent markers with modes of

normal, data, and off; operations are peak

search, marker to expected power, and marker

to expected frequency

Concurrency capabilities Spectrum monitor analysis can be performed

concurrently with all measurements

Span

RBW

Displayed dynamic range

100 MHz

5 MHz

50 dB

80 MHz

1 MHz

55 dB

40 MHz

300 kHz

60 dB

20 MHz

100 kHz

65 dB

12 MHz

100 kHz

65 dB

10 MHz

100 kHz

65 dB

5 MHz

30 kHz

70 dB

4 MHz

30 kHz

70 dB

2.5 MHz

10 kHz

75 dB

1.25 MHz

3 kHz

80 dB

500 kHz

1 kHz

80 dB

125 kHz

300 Hz

80 dB

0

1 MHz

55 dB

0

300 kHz

60 dB

0

100 kHz

65 dB

Supplemental characteristics

Typical level accuracy:

– < ± 2 dB for signals within 50 dB of a reference level

≥ –10 dBm and RBW < 5 MHz

– < ± 2 dB for signals within 30 dB of a reference level

< –10 dBm and RBW = 5 MHz using 5 averages

– < ± 3.5 dB for signals > –70 dBm and within 50 dB of a

reference level < –10 dBm with RBW < 5 MHz

GSM decoded audio level measurement

The MS needs to be stimulated with a pulsed audio signal at a

10 Hz rate with 50 percent duty cycle for the decoded audio level

measurement to provide accurate results.

Types of signals

measured

Encoded audio present on uplink TCH

Measurement range

200 Hz to 3.6 kHz

Measurement accuracy

Observed inaccuracies are due to MS encoder

errors since the algorithm in the test set

contributes no bit errors

Band pass filter

capabilities

100 Hz bandwidth, tunable from 200 Hz to

3.6 kHz, selectable as on or off

Measurement trigger

source

Immediate

Measurement

synchronization

None required

Numerical result

rms audio level

Multi-measurement

capabilities

1 to 999 measurements; average, minimum,

maximum, and standard deviation results

Concurrency capabilities GSM decoded audio level measurements

cannot be made concurrently with GSM BER

or GSM FBER measurements; GSM decoded

audio level measurements can be made con-

currently with all other measurements

Supplemental characteristics

Measurement resolution 0.01 percent