R&S 1129.7246.03, Operating Manual

Page: 159 / 855

R&S ESU Instrument Functions
Analyzer Mode
4.128 Operating Manual 1302.6163.12 - 03
Measurement example
The modulation spectrum of a GSM 900 signal is to be measured using the gated-
sweep function. The signal is generated by a Signal Generator whose RF output is
directly connected to the RF input of R&S ESU.
Settings on the Signal Generator:
The Signal Generator supplies a GMSK-modulated TDMA signal (GSM).
Settings on R&S ESU:
Conventions:
The following figure shows the screen display for setting gate parameters. The verti-
cal lines for gate delay (GD) and gate length (GL) can be adjusted to the burst signal
by entering numeric values or by means of the rotary knob.
FREQ: 802 MHz
Level: 0 dBm: Return
Digital Mod: Select: GMSK: Select
Source: Select: PRBS: Select: Return
Level Attenuation: Select: 60 dB: Return
[KEY] Menu called by this key. All information between the brackets
refers to this menu.
{Number} Numeric value to be entered for the parameter on hand.
SOFTKEY Softkey to be used for making a selection or entering a value.
[PRESET]
[FREQ : CENTER {802} MHz]
[SPAN {3.6} MHz]
[AMPT : REF LEVEL {0} dBm : RF ATTEN MANUAL : {10} dB]
[BW : RES BW MANUAL : {30} kHz]
[TRACE : TRACE 1 DETECTOR : RMS ]
[SWEEP : SWEEPTIME MANUAL : {50} ms]
[TRIG : EXTERN
GATED TRIGGER;
GATE SETTINGS
: GATE MODE EDGE; POLARITY POS
SWEEPTIME MANUAL {1} ms : GATE DELAY {300} µs :
GATE LENGTH : {250} µs]