Wavetek 171 Manual page 12

TTL PULSE
TRIANGLE
SINE
SQUARE
©
3-2
Digital Switch
When the digital switch is selected by the dial/digital
switch selector 2 the index lights and
the frequency output is determined by the digital
switch and the FREQ MULT.
DC OFFSET
Rotating DC OFFSET clockwise past 12 o'clock
offsets dc output or dc center reference of the out-
put waveform positive; when counterclockwise,
negative. When OFF, the dc output із signal ground
or the output waveform is balanced around signal
ground (OV in figure 3-2).
cl TE A
ov
Figure 3-2. Output Waveforms
^,^. , 1, and DC (Waveforms)
Sine WM, triangle ^ andsquare "1, waveforms
are selected by the larger of the two concentric
controls; the DC position provides a dc voltage out-
put controlled by DC OFFSET. Outputs appear at
500, OUT and 6002 OUT.
AMPLITUDE
Rotating AMPLITUDE fully clockwise provides
maximum peak-to-peak output at 500 OUT and
6002 OUT; rotating counterclockwise gives up to
20 dB attenuation. Also see ATTENUATION (8).
AMPLITUDE does not affect ас offset or dc output.
ATTENUATION
With a 60022 load on the 60022 OUT connector or
a 500 load on the 5082 OUT connector, output
voltage for each attenuation is:
Amplitude Control
Attenuation Full cw Full ccw
0 10V p-p 1У р-р
20 1V р-р 100 mV р-р
40 100 mV p-p 10 mV p-p
60 10 mV p-p (Not specified)
6000, OUT and 500 OUT Connectors
6000 OUT and 500 OUT provide variable fre-
quency and amplitude ^v , ^v , 1, and DC.
Maximum signal amplitude is 10V р-р with matching
loads (20V p-p into open circuit).
TTL OUT Connector
A fixed amplitude Transistor-Transistor Logic (TT L)
square pulse train of the output frequency. (TTL
levels are OV to 0.4V for a logic low and 2.4V to
5V for a logic high.) The output can drive up to 20
TTL loads. The pulse train can also be used as a
synchronizing reference to 500 OUT and 6000
OUT. Phase of output waveforms relative to the
TTL pulse is shown in figure 3-1.
REF OUT Connector
A fixed amplitude Transistor-Transistor Logic (TTL)
pulse train of 1 MHz whose origin_is an internal
clock oscillator or, if indicator 28 is lit, the
external reference signal of 1 MHz.
EXT REF IN Connector
Input for a 1 MHz sine or square wave external ref-
erence clock signal. The signal must be at least
1 Vrms. Synthesizer frequencies are referenced to
this signal when indicator 2 is lit.
GCV OUT Connector
DC excursions at the Generator Controlled Voltage
output (GCV OUT) of OV to about 2V proportion-
ally represents frequency within the range indicated
by FREQ MULT.
VCG IN Connector
DC excursions at the Voltage Controlled Generator
input (VCG IN) proportionally control frequency
within the range determined by FREQ MULT.
Positive voltage increases the frequency set by the
dial (1) ; negative voltage decreases the frequency.
Use in function generator mode only.