ARB
(contl
DC offset from - 5V to
+
5V is implemented in ARB exactly as in the Function
Generator definition.
Phase. Phase sets the Start/Finish point of the ARB wave between the peak to peak
limits set by AMPTD
.
The Start/Finish point is the beginning point of the first vector.
- -90
0
sets the Start/Finish at the negative amplitude limit.
- 0
0
sets the Start/Finish midway between the limits
.
- +
90
0
sets the Start/Finish at the pos
itive
amplitude limit
.
to Start
The last vector of every ARB wave must close the waveform. Its
Vector Height, displayed as
"1
FOO"
,
is not programmable but
lts
length is. This vector
slews directly to the Start/Finish point and remains there until the ARB wave repeats
.
To reduce the effect of the nonprogrammable Vector Height, set the Start/Finish point
of the ARB wave so the Return to Start Vector slope is zero (
V
=
0). Adjust
PHASE to obtain this characteristic.
Slope.
(the slope of a vector) is affected by V HGT but not by V LEN.
(
A m plit ude (Vp-p) )
.0008
V
HGT
2
=
t (seconds)
SYNC Output. The SYNC output is a TTL signal. The low portion occurs during the Return
to Start Vector.
Haight. V HGT sets the end point of every vector except the Return to Start Vec-
tor. Each count in the display sets the end point Yvolts from the vector's starting voltage.
Amplitude (Vp-p)
where Y
=
.0008
V HGT
V LEN
2
Distortion may occur if the net vector height of a waveform is set to be greater than
half of the amplitude setting. This is because the amplitude of the waveform must be
within the limits set by the AMPTD function key.
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