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

Audio generator specifications

Frequency

Operating range

100 Hz to 20 kHz

Accuracy

Same as timebase reference

Supplemental characteristics

Typical operating range

1 Hz to 20 kHz

Frequency resolution

0.1 Hz

GSM analog audio level measurement

Types of signals

measured

Sinusoidal audio signals

Measurement frequency

range

100 Hz to 15 kHz

AUDIO IN level range

7.1 mV to 20 V peak (5 mV to 14.1 V rms)

Measurement accuracy

< ± (2 percent of reading + resolution) for

100 Hz to ≤ 8 kHz

< ± (3 percent of reading + resolution) for

> 8 to 20 kHz

Measurement THD plus

noise

< 200 μV rms

Measurement detectors rms or peak

Measurement trigger

source

Immediate

Measurement

synchronization

None required

Numerical result

Audio level

Multi-measurement

capabilities

1 to 999 measurements; average, minimum,

maximum, and standard deviation results

Concurrency capabilities GSM analog audio level measurements cannot

be made concurrently with GSM multi-tone

audio, but can be made concurrently with all

other measurements

Supplemental characteristics

Typical measurement

accuracy

< ± 1.2 percent of reading for 100 Hz to ≤ 8 kHz

and 20 mV to 20 V peak

Typical external input

impedance

100 k Ω in parallel with 105 pF

Measurement resolution 0.3 percent of expected level setting or 0.2 mV,

whichever is greater

Output level from AUDIO OUT connector

Ranges

0 to 1 V peak, 1 to 9 V peak (into ≥ 600 Ω)

Accuracy

< ± (1.5% of setting + resolution) when output

is DC coupled

Distortion

< 0.1 percent for 0.2 to 9 V peak into ≥ 600 Ω

Pulse mode

Pulsed audio signal at a 10 Hz rate with 50

percent duty cycle, selectable as on or off

(for use with the GSM decoded audio level

measurement)

Coupling mode

Selectable as DC or AC (5 μF in series with

output)

Supplemental characteristics

Typical maximum output

current

100 mA peak into 8 Ω

Typical output

impedance

< 1.5 Ω at 1 kHz when output is DC coupled

Typical DC offset (when

output is DC coupled)

< 1 mV for 0 to 1 V peak output, < 10 mV peak

for 1 to 9 V peak output

Output level resolution

< 0.5 mV for 0 to 1 V peak output

< 5.0 mV for 1 to 9 V peak output

GSM analog audio measurement specifications

All analog audio measurement specifications apply to signals present at

test set’s AUDIO IN ports.

De-emphasis

750 μs de-emphasis selectable as off or on

Expandor

Selectable as off or on with reference level

setting of 10 mV to 10 V

Filters

None, C-message, 50 Hz to 15 kHz band pass,

300 Hz to 15 kHz band pass, or 100 Hz

bandwidth tunable band pass, tunable over

300 Hz to 15 kHz