The Offset Setup Condition - HP 7090A Operator's Manual

Default V alue:
• •• •
Range of Selectable Values:
OFFSET
The setup condition should be used in conjunction with RANGE when
measuring signals having a median voltage
OfFSET
specifies a de voltage offset that is applied
signal. This de offset effectively shifts the median signal voltage onto the
zero-voltage axis of the recording area, as shown by the illustration below.
SIGNAL
WITH
Vmed >OV
RECORDING
AREA
(RANGE·,OV)
SIGNAL
WITH
Vmed
<cv
t
An offset value should be used that will allow the entire signal
within the recording area boundaries detennined by the range equation .
This value is given by the
Because the mean signal voltage is shifted onto the zero-voltage axis
axis) of the recording area when
values assigned to the recording area Y-axis and boundaries are also
shifted. The resulting Y - axis and boundary values are obtained by sub·
tracting the offset value from the current values, so that
' j
0.0 volts .
-100.0 to 100.0
JOV - - - --
-
- - - - - - -
l O V .­
,
- - �
-
ov
-10V I. -
-
-w v
- - - - -
-J OV --- -
-
--
- -
- - -
offset equaticn
an offset condition is used, the voltage
Upper Boundary (RANGE)
=
(OFFSET)
Y-Axis -
=
Lower Boundary (-RANGE)
=
Scans by ArtekMedia © 2007
volts.
Vmod
that is not equal
in
series with the input
-
NEGATIVE OFFSET \ - 20V)
j
SHIFTS THE SIGNAL
DOWN ONTO THE
RECORDING AREA.
ZERO POINT
POSITIVE OF FSET (20V)
1
SHIFTS THE SIGNAL
UP ONTO THE
RECORDING AREA
-
to
be plotted
below.
- (OFFSET)
-
(OFFSET)
The Offset Setup
Condition
to zero .
Shifti n g a Signal
onto the Recording
Using Of f set
Area
.
(y.
Measurement Setup Operations 3-13