Limit
±1%±20mV
G.2.13 DC Offset Aeeuraey Test
Purpose
Verify the DC offset accuracy
Specification
Parameter
Offset accuracy
Setup
and
Procedure
Select function DC. Measure voltage at Main Out terminated iuto
son.
Termination must be accurate to
at
least 0.25%.
Offset Program
Min.
+5.00 V 4.93 Vdc
u.oo
Vp-p -0.02 Vdc
-5.00 Vp-p -5.07 Vdc
G.2.14 Harmonie Distortion Test
Max.
5.07Vdc
0.02 Vdc
-4.93 Vde
Pur
pose
Verify the sine waveform meets distortion specifications
Specification
Frequency Range
::;;100
kHz
::;;s
MHz
gO
MHz
Limit
THD<0.15%
no harmonie >-35 dBe
no harmonic >-22 dBc
Setup
and
Procedure
Select fuuction sine. Terminate Main Out into
500.
Program frequencies
and amplitudes aecording to the following table to verify distortion.
Frequency Min. Max.
100 kHz, 5.01 Vp-p nia 0.15 %
100 kHz, 10 Vp-p nia 0.15 %
5 MHz, 10 Vp-p nia -35 dBc
30
MHz, 10 Vp-p nia -22 dBc
40 MHz, 1% Vp-p nia -22 dBc
Note: The instruments that are typically used to measure THD have the inherent problem
that noise is integrated iuto the distortion measurement and gives erroneous readings. At
measurement points at or below 1 kHz, the
THD
aualyzer input filters provide a good
method
of
high frequency noise rejeetion. At higher frequencies these filters can not
he
used as they would reduce the harmonie levels.
If
a Model 395 is exeeeding the specified
limit, then direct measurement
of
the harmonic levels will be required to determine
if
the
problem is distortion
or
noise. White this
is
mainly a problem with
low
amplitude
signaIs,
it
should be considered with
aH
THD measurements.
G-6 Performance Verification
and
Alignment Procedures
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