The frequency is then incremented to the Maximum Bandwidth specification
value
(Freq
hi
)
. 4000 samples are acquired and the standard deviation is again
calculated to get a
Vmeas
hi
.
Vmeas
hi
is compared with
Vref
and must be lower
than
3dBval
.
A fictitious line is drawn between the two measured points. From the point
where this line meets the
3dBval
the frequency is calculated.
ACgain
lo
= 20log
10
(
Vmeas
lo
/
Vref
)
ACgain
hi
= 20log
10
(
Vmeas
hi
/
Vref
)
Bandwidth
= ((
ACgain
lo
+ 3) / (
ACgain
lo
-
ACgain
hi
)) * (
Freq
hi
-
Freq
lo
) +
Freq
lo
7.3.2
Full Bandwidth test
During this test the amplitude behavior of the amplifier is tested over the
frequency range the amplifier supports.
The start frequency is set to maximum sample rate of the channel / 2000 =
Fstart. The end frequency is set to the maximum sample rate of the channel =
Fstop. The frequency range from Fstart to Fstop is divide in frequency ranges
of decades and per decade we test 5 steps.
The used Frequency decades are:
100 Hz to 1 kHz
1 kHz to 10 kHz
10 kHz to 100 kHz
100 kHz to 1 MHz
1 MHz to 10 MHz
10 MHz to 100 MHz
etc.
During the test a sine
-
wave of the selected frequency is applied using 90 %
peak to peak amplitude of the full scale amplifier range that is currently being
tested.
Note
The Fluke 5820A or 5900B calibrator only supports a maximum of a 5.5 V peak
to peak signal. So any amplifier range above 50 V
-
results will be negatively
influenced by the maximum of the 10 % full scale signal.
ISOBE5600
I2716-4.0 en
97
Содержание Genesis ISOBE5600
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