U2044XA Datasheet, PDF (14/25 Pages) Keysight Technologies – U2040 X-Series Wide Dynamic Range Power Sensors

14 | Keysight | U2040 X-Series Wide Dynamic Range Power Sensors – Data Sheet
Additional Specifications for U2042XA/44XA USB
Peak and Average Power Sensor
Measured rise time percentage error versus signal-under-test
rise time
45%
40%
35%
30%
25%
20%
15%
10%
5%
0%
100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 9501000
Signal under test rise time (ns)
Figure 6. 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
U2040 X-Series 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
Video bandwidth
The video bandwidth in the normal mode of the U2042XA/44XA can be set to High,
Medium, Low, 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 5, “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.
Video bandwidth setting (normal mode)
LOW: 300 kHz MED: 1.5 MHz HIGH: 5 MHz
Rise/fall time
< 300 MHz
6.9 µs
6.9 µs
2.0 µs
Overshoot ¹
≥ 300 MHz
< 300 MHz
0.6 µs
2%
0.3 µs
2%
0.1 µs
3%
≥ 300 MHz
12%
15%
9%
The average mode of the U2040 X-Series provides accurate average power measurements
for broadband modulated signals similar to a thermocouple sensor. This is due to the U2040
X-Series’ four path diode design, which enables all the diodes to operate in their square-law
region.
1.  Specification is based on pulse signal with ≥ 80 ns rise time.
OFF
2.0 µs
0.1 µs
4%
5%