Delay Of Triggered Pulse - Wavetek 145 Instruction Manual

MAIN DIAL
VCGIN OUTPUT
SETTING
VOLTAGE FREQUENCY
FACTOR
2.0 -2.0 .002
1.8 -1.6
.2
1.6 -1.2 A
1.4
- .8
~~\..~~
.6
~'I-~ -
1.2 - .4_.. .8
- -
-
EXAMPLE 1
1.0
-
-0 1.0
'
- - -
'
.8
'
+ .4 1.2
'
.6
'
1.4
+ .8
'
.4
+1.2
'~+
1.6
'""~
-......:0<
.2 +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 0V VCG input, fre-
quency is as determined by the main dial setting, 1.0 in this
example. Example 2 shows that with c1 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 results 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, 111000th 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 0V at VCG IN provide the up to
1000: 1 frequency sweep. With the dial set to .002, excur-
sions between 0V and +2V at VCG IN prov1de 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 ¼ 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 = (
4
d
1
1
. d )
• e ay
in
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
~./,"',... ' - - F - 1 CYCLE
GENERATOR BASICAv •
~
WAVEFORM (NOT OUTPUT) :
1
1 :
GENERATOR BASIC
r"L
~LL
WAVEFORM (NOT OUTPUT) I I
__J l.._j/4
CYCLE, FREQUENCY
7 1
DIALCONTROLLED
_Jl_- - □ ELAY
SYNC OUT ~ 30 ns
DELAY-CONTROLLED DELAY - - - I
j.--
OUTPUT PULSE
~
Figure 3-7. Pulse Delay From Trigger
3-7