Delay Of Triggered Pulse - Wavetek 145 Instruction Manual

MAIN DIAL
SETTING
2.0
1.8
1.6
VCGIN
VOLTAGE
-2.0
-1.6
-1.2
OUTPUT
FREQUENCY
FACTOR
.002
'
'
.2
.6
.8
1.0
1.2
1.4
1.6
1.8
. 002 +2.0 2.0
Figure 3-6. VCG Voltage-to-Frequency Nomograph
Figure 3-6 is a nomograph with examples of dial and voltage
effects. Example 1 shows that with OV VCG input, fre·
quency is as determined by the main dial setting, 1.0 in this
example. Example 2 shows that with
c;i
positive VCG input,
output frequency is increased. Example 3 shows that with a
negative VCG input, output frequency is decreased. (Note
that the Output
Frequen~y
Factor column value must be
multiplied by a frequency range multiplier to give the actual
output frequency.)
NOTE
The frequency vernier must be rotated fully
ccw for 1000:1 range.
Nonlinear operation resu/'ts when the VCG input
voltage is excessive; that is, when the attempted
generator frequency exceeds the range setting
(2 times the multiplier setting) or in the other
direction, 1 /1000th of the range setting.
The up to 1000:1 VCG sweep of the generator frequencies
available in each range results from a 2V excursion at the
VCG IN connector. With the frequency dial set to 2.0, ex·
cursions between -2V and OV at VCG IN provide the up to
1000: 1 frequency sweep. With the dial set to .002, excur·
sions between OV and +2V at VCG IN provide the up to
1000: 1 sweep within the set frequency range.
3.2.5 Delay of Triggered Pulse
Additional pulse delay is· available in triggered mode. Not!
only is the PULSE DE LAY usable, but the % cycle delay
between trigger acceptance and sync pulse shown in
figure 3-7 can also be variable delay.
Merely determine the delay desired and apply this formula
for the frequency setting:
Frequency in Hz
=
14
d
1
1 .
d )
• e ay m secon s
Then, adjust the pulse width for your desired pulse. Practical
range with· the frequency dial and multiplier is 1 ms to
42 minutes. Delay control range is 50 ns to 10 ms .
Frequency vernier and start/stop control also affect the
delay. So, for accurate frequency dial control of delay, set
these at their cal positions.
TRIGGER -A.--+-TRIGGER LEVEL
GENERATOR BASIC
'\t
~ 1
CYCLE
WAVEFORM (NOT OUTPUT) : I
1
:
GENERATOR BASIC
f"lJ : 1--i
l
WAVEFORM (NOT OUTPUT)_i_J
Li_
_J
L,j/4
CYCLE, FREQUENCY ·
I I
DIALCONTROLLED
_JL_-
-DELAY
SYNC
OUT~
30
ns
DELAY-CONTROLLED
DELAY~
!+-
OUTPUT PULSE
__Il_
Figure 3-7. Pulse Delay From Trigger
3-7