Tektronix PFG 5105, Instruction Manual

Page: 39 / 89

Operating Instructions
Code
410
420
Table 2-3 (Cont)
SPECIAL FUNCTIONS
Description
Enters duty cycle mode. When a duty cycle
of 1 0-85% is entered, the PFG 5105/5505
will change width to maintain the duty cycle
as the period changes. A width entry
removes the instrument from duty cycle
mode.
Allows a predefined output level to be set.
Use the INCREMENT up and down arrow
keys to select one of the following: TTL,
(0-3 V); CMOS (0-4.99 V); ECL (-0.8 V to
-1.8 V). The amplitude/offset value can be
used to modify the predefined level.
Calibration
51
o
Calibration routines. For use by qualified
service personnel or.!y.
Stepping a Parameter Level
The PFG 5105/5505 allows the user to step the level
of the following parameters/functions, while the output
waveform is being generated. Stepping is done by
selecting the parameter/function, and pressing the
INCREMENT up- or down-arrow key. The step size
is determined by the INCR SIZE setting for the
selected parameter.
FREQ
steps the waveform frequency
AMPL
WIDTH steps the waveform amplitude
steps pulse width
DELAY steps pulse delay
OFFSET steps the offset voltage
RAT E steps the value used by RAT E to control
the sweep rate and the internal trigger
rate.
N �URST steps the number-in-burst value that con­
trols the number of cycles generated in
BURST mode.
DC steps the output voltage of the DC
function.
The direction of step change is determined by the
user: pressing the INCREMENT up-arrow key steps
in a positive direction; the down-arrow key in a
negative direction.
INCR SIZE operates in two modes. In the default
mode, the PFG 5105/5505 automatically sets the value
of INCR SIZE to the least significant digit of the range
for the currently selected parameter. When parameter
selection changes, the value of INCR SIZE automat­
ically changes accordingly.
In the non-default mode, the value of INCR SIZE is
set by the user as follows: with the parameter to be
stepped selected, press INCR SIZE, enter a step size
using the DATA keypad, press ENT ER. In this mode,
step size is locked to the user-selected value until
the user resets the step size to
o.
Note that setting
INCR SIZE to a value that is less than the least
significant digit for the currently selected parameter
range generates an error when the INCREMENT key
is pressed.
Table 2-4
DEMO SETUPS
1
SETUPS
1
PARAMETER
DEMO
RECALL FREQ RATE AMPL
Basic Sinewave
90 1 MHz
-
1 V
91 1 MHz 1 00 µs 1 V
92
-
1 00 flS 1 V
93
-
1 flS
3 V
94 1 MHz
-
2 V
Slow Sweep 95
-
5 ms2 1 V
(1 kHz to 10 kHz)
Fast Sweep 96
-
20 flS4 1 V
(1 00 kHz to 10 M Hz)
Setups Requiring External Signal Source
VCO (FM) 97 10 MHz5
-
1 V
Delayed Pulse
I
98
_s
-
1 V
Amplitude Modulation 99 1 MHz7
I
-
1 V
1 Demo setups loaded by pressing
I
SPCL
I
@] 12) @]
I
ENTER
I
2 1 .28 seconds per sweep
3 Press
I
RUN j to start sweep
4 5.1 2 ms per sweep
OFFSET
0 V
o v
o v
1 .5 V
2 V
o v
o v
O v
o v
o v
NBURST
-
I
1 0
-
-
-
-
-
I I
I
-
-
I
-
I
FUNCTION-PULSE SWEEP
I
TRIG I
lour
FUNCTION WIDTH DELAY START STOP MODE
'\.,;
- - - -
I
I NT
I
CONT
I
ON
'\.,;
- - - -
I NT
I
BURST
I
ON
Jul
1 flS 10 flS
- -
I
INT I TRIG I ON
IL
100 ns 0 flS
-
I
-
I
I NT I TRIG
I
ON
/\/
-
- -
-
I NT CONT ON
'\.,;
- -
1 kHz 10 kHz3 INT CONT ON
�
- -
1 00 kHz 10 MHz3 INT
CONT ON
I
I
i
�
- - - -
I NT I CONT FM ! ON
IL
40 ns 1 flS
- -
I EXT
I
TRIG
I
ON
r\__;
- - - -
i EXT
I CONT FM i ON
5 A 0-5 volt input at the VCO/FM IN connector effects a 10 kHz- 1 2 MHz frequency range. For VCO mode, RANGE LOCK (accessed thru SPCL 260) is turned OFF
6 With 1 msec delay, external trigger (TTL levels) rate to TRIG IN connector should not exceed about 800 kHz.
7 A 5 volt p-p (-2.5 V to + 2.5 V) input to the AM IN connector effects 100% modulation (output ranges from 0 V to 2 V)
2-1 2
PFG 5105/5505 Instruction Manual