Wavetek 188 Manual page 15

Соппесіог Impedance
ООЛ Ne o er sic 500
OUT оо ОЙЫ ЖЕ 500
СИК ОКОЛ ОАЕ БО За а a Е
PRGIN з н а н е . сан ар w te ex ықы б
VE GUNEE жақы rT E зъб аа, 2 ко
SMO UTA Фе И ты ПИ a 6000
(ОСЛО Ва a к АНА o қама ЖЫ 6000
"Тһе ТТІ OUT connector is diode protected and сап
drive up to 20 Transistor-Transistor-Logic (TTL) loads
(low level between ОМ and 0.4М, and high level bet-
ween 2.4V and 5V). It should not be connected to
resistive load less than 6009. The TRIG IN connector
accepts TTL logic levels, is diode protected, and re-
quires 500 „A drive from a high level output.
RECEIVING
MODEL 188 INSTRUMENT
EFFECTIVE
CIRCUIT
RESISTANCE
RG58 OR
OUTPUT | EQUIVALENT
IMPEDANCE
500
(SIGNAL
LOAD)
>500
OUTPUT
AMPLIFIER
Figure 3-2. Signal Termination
3.2.2 Manual Function Generator Operation
For basic operation, select the waveform frequency
and amplitude. The following steps demonstrate
manual control of the function generator. (Bold
numbers are keyed to figure 3-1.)
Step Control/Connector Setting
16 Connect circuit to either
output (refer to para-
graph 3.2.1).
ї БОООЏТ 15
Set to desired range of fre-
quency.
2 FREQUENCY
MULTIPLIER 4
Set to desired frequency
within the range.
3 Frequency Dial 1
4 SWEEP'sCONT 5 Extended.
5 FUNCTION 12 Set to desired waveform.
6 DC OFFSET 13 Setasdesired. Limit wave-
form amplitude to prevent
clipping (see figure 3-3).
7 AMPLITUDE 14 Set for desired amplitude.
3.2.8 Voltage Controlled Function Generator
Operation
Operation as a voltage controlled function generator
(VCG) is as for a manually controlled function
generator, only the frequency within a particular range
is additionally controlled by an external voltage (+ 4V
excursions) injected at the VCG IN connector. Per-
form the steps given in paragraph 3.2.2, only set the
frequency dial to determine a reference from which
the frequency is to be voltage controlled:
OFFSET
+ 5V AN
E АД й
° POSITIVE NEGATIVE
DC OFFSET DC OFFSET
+5V АЛ)
— М. АЛ,
EXCESSIVE EXCESSIVE
POSITIVE NEGATIVE
OFFSET OR OFFSET OR
LOADING LOADING
Figure 3-3. DC OFFSET Control
1. For frequency control with positive dc inputs at
УСС IN, set the dial for a lower frequency limit.
2. For frequency control with negative dc inputs at
VCG IN, set the dial for an upper frequency limit.
3. For modulation with an ac input at VCG IN, set
the dial at the desired center frequency. Do not
3-3