Operating instructions

More Complex Programming Examples R&S ESCI
1166.6004.12 7.30 E-1
Fast Power Measurement on Power Ramps
A frequent task in mobile radio tests is measurement of a DUT at various power control levels at the
highest possible speed. The R&S ESCI offers two test functions for this task, which can be used
depending on the signal characteristics.
In the following, the two methods are presented by means of two examples.
Power Measurement with Multi-Summary Marker
The multi-summary marker function is suitable for measuring the power of a sequence of pulses with
the following characteristics:
• The pulses occur at identical time intervals, which is typical of GSM transmission in slots, for
example.
• The level of the first signal is reliably above threshold.
• The subsequent pulses may have any levels.
The function uses the first pulse as a trigger signal. The power of the subsequent pulses is determined
exclusively via the timing pattern selected for the pulse sequence. The function is, therefore, suitable for
adjustments where the DUT output power varies considerably and is not reliably above the trigger
threshold.
The measurement accuracy is determined by the ratio of pulse duration to total measurement time; this
should not be below 1:50.
The function always uses TRACE 1 of the selected screen.
t
Trace start
Time offset of
first pulse
Measurement
Time
Measurement
Time
Measurement
Time
Period Period
P
Trigger
Threshold
Fig. 7-1 Block diagram illustrating signal processing in analyzer
In the example below, a sequence of 8 pulses is measured with an offset of 50 µs of the first pulse,
450 µs measurement time/pulse and 576.9 µs pulse period.