Rohde & Schwarz ESIB7 Manuel D'utilisation page 21

Setting the Measurement Time
The measurement time is the time during which ESIB measures the input signal and forms a
measurement result weighted by the selected detector. The measurement time does not include settling
times. ESIB automatically waits until transients are over.
CONFIGURATION MODE - EMI RECEIVER menu
MEAS TIME
Effect of measurement time with
CISPR Average measurement
1088.7490.01
The MEAS TIME softkey activates the entry field for the measurement time.
The measurement time can be set with 2 digits resolution in the range 100 µs
to 100 s, e.g. 980 ms, 990 ms, 1 s, 1.1 s.
When the quasi-peak detector is used, the minimum measurement time is
1 ms.
When the CISPR average detector is used, the minimum measurement time
is 100 ms.
With the average, RMS, AC video or min/max peak detector the smallest
settable measurement time depends on the bandwidth.
Bandwidth Shortest measurement time
≤ 10 Hz
100 Hz
200 Hz
1 kHz
9 kHz
≥ 100 kHz
IEC/IEEE-bus command :[SENSe:]SWEep:TIME <numeric_value>
With CISPR Average measurements, the maximum value of
the weighted signal during the measurement time is displayed.
The relatively long time constants used with CISPR Average
detectors entail long measurement times to obtain correct
results. With unknown signals the measurement time should be
at least 1 s. This ensures correct weighting of pulses down to a
pulse frequency of 5 Hz.
After a frequency change or a modification of the attenuation,
the receiver waits until the lowpass has settled before the
measurement time starts. The measurement time is selected
depending on the IF bandwidth and the characteristics of the
signal to be measured. Unmodulated sinusoidal signals as well
as signals with high modulation frequency can be measured
within a short time. Slowly fluctuating signals or pulse signals
require longer measurement times.
AV, RMS
1 s
100 ms
50 ms
10 ms
1 ms
0.1 ms
C
Shortest measurement time
PK+, PK-, AC video
10 ms
1 ms
1 ms
0.1 ms
0.1 ms
0.1 ms
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