Wavetek 182A Instruction Manual page 12

MOD EL 182A TIL OUT
FUNCTION
GENERATOR
Figure 2·2. Second Setup
2.4 CHANGING THE OUTPUT IMPEDANCE
The output impedance is normally:
HI 10V p-p (500 source) into 500.
LO 1V p-p (500 source) into 500.
Amplitude is normally variable over 20 dB with - 50 dB
lowest possible amplitude.
Step Control
1 POWER
2 Dial
I
I
3 FREQUENCY
MULTIPLIER
I
4 AMPLITUDE
5 DC OFFSET
6 AMPLITUDE
7
Function Generator
or DC Voltage
Source
8 FUNCTION
9 MODE
released).
10 MANUAL TRIGGER Press and hold.
Set up trigger source as shown in fi g ure 2 - 2 . Set trigger source for 100 Hz
�--
I
12 Trigger/Gate Trigger (depressed)
2-2
OSCILLOSCOPE
D
SYNC
CH1 CH2
Table 2· 1. Initial Checkout
Position/Operation
ON
Rotate either direction. Return Rotation ccw increases frequency of
to 2.0.
Press each switch sequentially; Frequency increases in decade steps, left to
return to X
1 K.
Rotate ccw.
Rotate cwo Return to OFF.
Rotate cwo
Vary input dc voltage; then discon- Frequency increases with positive voltage and
nect VCG IN input.
Press .f\.r, rtJ 'V .
,
Gate (CONT depressed, TRIG/GATE A dc level near zero volts (except f1..J function).
If simultaneous 6000 and 500 output impedances are
desired:
1. Change value of R148 from 4990 to 6040.
2. Remove R149.
The result is:
HI 10V p-p (500 source) into 500.
LO 10V p-p (6000 source) into 6000.
Amplitude is variable over 30 dB with - 30 dB lowest
possible amplitude. Square wave rise and fall time is
less than 150 ns. Any value greater than 6000 may
also be substituted for the value of R148 for other out­
put impedances.
To increase the range of the variable amplitude con­
trol in a modified unit beyond 30 dB, decrease the
value of R124 as necessary. Waveform quality
relative to the standard unit is not guaranteed below
- 30 dB and above 20 kHz.
Observation
10V square wave on CH 1 and
±
Return to CH1 only.
rotation cw decreases frequency.
right.
Amplitude decreases.
Output immediately offset negative, then moves
positive. OFF return it to original level.
Square returns to original amplitude.
decreases with negative voltage.
Observe .f\.r, rtJ
'V waveforms.
,
C ontinuous "v .
"v gated on during positive portion of TIL
signal on CH2.
i
One Jy- cycle per trigger cycle.
± 1 V on CH2.
rtJ
si g nal.
TTL