R&S ESU Series Operating Manual page 159

R&S ESU
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:
FREQ:
Level:
Digital Mod:
Source:
Level Attenuation:
The Signal Generator supplies a GMSK-modulated TDMA signal (GSM).
Settings on R&S ESU:
Conventions:
[KEY]
{Number}
SOFTKEY
[PRESET]
[FREQ:
[SPAN
[AMPT:
[BW:
[TRACE:
[SWEEP:
[TRIG:
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.
4.128
802 MHz
0 dBm: Return
Select: GMSK: Select
Select: PRBS: Select: Return
Select: 60 dB: Return
Menu called by this key. All information between the brackets
refers to this menu.
Numeric value to be entered for the parameter on hand.
Softkey to be used for making a selection or entering a value.
CENTER {802} MHz]
{3.6} MHz]
REF LEVEL {0} dBm: RF ATTEN MANUAL: {10} dB]
RES BW MANUAL: {30} kHz]
TRACE 1 DETECTOR: RMS]
SWEEPTIME MANUAL: {50} ms]
EXTERN
GATED TRIGGER;
GATE SETTINGS: GATE MODE EDGE; POLARITY POS
SWEEPTIME MANUAL {1} ms: GATE DELAY {300} µs:
GATE LENGTH: {250} µs]
Instrument Functions
Analyzer Mode
Operating Manual 1302.6163.12 - 03