User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
252User Manual 1178.3370.02 ─ 03
Table 7-8: Signal generator settings (e.g. R&S SMW)
Frequency 890 MHz
Level 0 dBm
Modulation GSM, one time slot is switched on
1. Select PRESET to reset the instrument.
2. Set the center frequency to 890
MHz.
3. Set the frequency span to 0 Hz.
4. Set the resolution bandwidth to 1 MHz.
5. Set the reference level to 0 dBm (= level of the signal generator).
6. Set the sweep time to 2 ms (SWEEP > "Sweep Time Manual" ).
The R&S FPL1000 shows the GSM burst continuously across the display.
7. Use the trigger source "Video" and the trigger slope "Rising" to trigger on the rising
edge of the burst and shift the start of the burst to the center of the display (see
step 3 in "Measuring the Edges of a GSM Burst with High Time Resolution"
on page 249).
8. Activate power measurement within the activation phase of the burst in zero span.
a) Press the MEAS key.
b) Select "Time Domain Power" .
c) Select "Time Dom Power Config" .
d) Set the "Limits" state to "On" .
e) Select the "Left Limit" input field.
f) By turning the rotary knob clockwise, move the vertical line "S1" to the start of
the burst.
g) Select the "Right Limit" input field.
h) By turning the rotary knob clockwise, move the vertical line "S2" to the end of
the burst.
9. Measure the power during the deactivation phase of the burst by switching the trig-
ger slope to "Falling" (TRIG > "Trigger/ Gate Config" ).
The R&S FPL1000 initiates triggering in response to the falling edge of the burst.
This shifts the burst to the left-hand side of the measurement diagram. The power
is measured in the deactivation phase.
Measurements and Results