CONTROLS AND INDICATORS
GENERAL FUNCTION CONTROLS
1.
ON Indicator. Lights when oscilloscope is “on”.
2.
POWER Pushbutton. Turns oscilloscope “on” and
“off”.
3.
INTENSITY Control. Adjusts brightness of trace.
4.
TRACE ROTATION Control. Adjusts to maintain
trace at a horizontal position.
5.
FOCUS Control. Adjusts trace focus.
6.
20 MHz/100 MHz Pushbutton. When released,
selects 100 MHz bandwidth. When engaged, limits
bandwidth to 20 MHz.
7.
GND
Terminal. Oscilloscope chassis ground
jack, and earth ground via three-wire ac power cord.
8.
CAL Terminal. Terminal provides 2 V p-p, 1 kHz
(nominal) square wave signal. This signal is useful for
checking probe compensation adjustment, as well as
providing a rough check of vertical calibration.
VERTICAL CONTROLS
9.
VERTical MODE Switch. Selects vertical display
mode. Four-position lever switch with the following
positions:
CH1:
Displays the channel 1 signal by itself.
CH2/X-Y:
CH2: displays the channel 2 signal by itself.
X-Y: used in conjunction with the X-Y control and
Trigger SOURCE switch to enable X-Y display
mode.
DUAL:
Displays the channel 1 and channel 2 signals simul-
taneously. Dual-trace mode may be either alternate
or chopped sweep; see the description under CH1
POS/PULL CHOP control.
ADD:
The inputs from channel 1 and channel 2 are
summed and displayed as a single signal. If the
Channel 2
POSition/PULL INVert control is
pulled out, the input from channel 2 is subtracted
from channel 1 and the difference is displayed as a
single signal.
Fig. 1.
Model 2190A Controls and Indicators.
7
2
5
1
3
14
29
15 28
27
26
25
24
23
22
21
30
20
19
18
17
16
8
9
6
7
13
12
11
10
4