HBM Genesis ISOBE5600, Руководство пользователя

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7.3 Bandwidth Test
General information
Required equipment:
l
The HF generator
l
50 ohm termination plug
Acquisition settings:
l
Maximum sample rate
l
All channels are DC coupled
l
Mode
-
, Filter
-
and Range
-
settings as defined by the verification process.
HINT/TIP
The bandwidth test uses a selected set of all Mode Filter and Range settings
supported by the
D evice U nder T est (DUT). The selection is done based on the
technical design of the DUT to ensure all design combinations are tested.
There are two types of bandwidth test:
l
The quick bandwidth test
l
The Full bandwidth test
The quick bandwidth test is always run as standard to determine the
-
3 dB point.
If Full bandwidth is selected, an enhanced test is also performed on the different
signal frequencies.
7.3.1 Quick Bandwidth Test
AC
-
gain is measured using a total of 3 frequency values, to check if the
-
3 dB point is within specifications.
A 90 % full scale AC signal is input from the HF generator into the device under
test. The initial signal frequency is set to 500 Hz using Fluke 5700A or 5720A
or 50 kHz using the Fluke 5820A or 9500B.
4000 samples are acquired and the standard deviation calculated and stored
as
Vref .
The
-
3 dB point is calculated as (.7071* Vref) and is denoted as 3dBval .
The frequency is then incremented to the Minimum Bandwidth specification
value
(Freq
lo
) . 4000 samples are acquired and the standard deviation is
calculated to get a Vmeas
lo
. Vmeas
lo
must be higher than 3dBval .
ISOBE5600
96 I2716-4.0 en