Datasheet

Page 17
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Measured rise time percentage error versus signal-under-test rise time
Although the rise time specification is ≤ 100 ns, this does not mean that the U2042/44/49/63
and L2061/62/63XA X-Series peak and average power sensor can accurately measure a signal
with a known rise time of 100 ns. The measured rise time is the root sum squares (RSS) of the
signal-under-test (SUT) rise time and the system rise time:
Measured rise time = √ [(SUT rise time)
2
+ (system rise time)
2
]
And the % error is:
% error =
[
measured rise time – SUT rise time
]
× 100
SUT rise time
45%
40%
35%
30%
25%
20%
15%
10%
5%
0%
Percent error
100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950
1000
Signal under test rise time (ns)
Figure 6. Measured rise time percentage error versus signal under test rise time.
Additional Specifications for U2042/44/49/63 and L2061/62/63XA X-Series Peak
and Average Power Sensor
Video bandwidth
The video bandwidth in the normal mode of the X-Series peak and average power sensor can
be set to High (5 MHz), Medium (1.5 MHz), Low (300 KHz), and Off. The video bandwidths stated
below are not the 3 dB bandwidths, as the video bandwidths are corrected for optimal flatness
(except the Off filter). Refer to Figure 6, “Characteristic peak flatness,” for information on the
flatness response. The Off video bandwidth setting provides the warranted rise time and fall time
specifications and is the recommended setting for minimizing overshoot on pulse signals.