OPERATING INSTRUCTIONS
18
SWEEP
OPERATION
1. Select LINEAR sweep by leaving the
SWEEP LIN/LOG
switch
(23) in the released position or select LOG sweep by engaging the
SWEEP LIN/LOG
switch.
2. Rotate
COARSE FREQUENCY
Control to minimum (CCW).
3. Engage the
RUN/SET
switch to adjust the start and stop sweep
frequencies.
4. With the
START/STOP
switch set to START (released position),
adjust the starting frequency of the sweep by adjusting the
START
control and observing the counter.
5. Engage the
START/STOP
switch to the STOP position and adjust
the stop sweep frequency by adjusting the
STOP
control.
6. Release the
RUN/SET
switch for sweep operation. The sweep rate
can be adjusted with the
SWEEP TIME
control. Clockwise
rotation increases the sweep rate.
If the output of the circuit to be tested is connected to the vertical
scope input, and the GCV output to the horizontal, setting the scope to
X-Y mode produces the amplitude vs. frequency plot. However, note
that switching to LOG sweep still produces a linear display on the scope.
This is because the horizontal sweeping signal, the internal log ramp,
also becomes logarithmic when the sweep does. To view a true
logarithmic graph, put the scope back in time base operation and use the
Sweep output solely as a scope trigger. Use the scope's linear time base
as a horizontal deflection source.
USE OF FREQUENCY COUNTER WITH EXTERNAL
SIGNALS
The frequency counter display in the Model 4040 is
normally used to monitor the internally generated output.
However, it can also be used as a stand-alone frequency
counter up to 30 MHz.
1. Set the
CNTR INT/EXT
switch to EXT.
2. Apply the signal to be measured to the
EXT CNTR
INPUT
jack on the front panel.
3. Obtain the desired display resolution by selecting the
appropriate gate period using the GATE pushbutton
switch. The resolution obtained with each of the four gate
settings is as follows, given an input signal of exactly 2
KHz.
Gate Setting
Reading
Indicator
0.01S
2.0
KHz
0.1S
2.00
KHz
1S
2000
Hz
10S
2000.0
Hz
