Tektronix 2246 User Manual

Controls, Connectors, and Indicators— 2246 Operators
CH 1---The signal applied to the CH 1 OR X input
connector is the source of the trigger signal.
CH 2—The signal applied to the CH 2 input con-
nector is the source of the trigger signal.
CH 3—The signal applied to the CH 3 input con-
nector is the source of the trigger signal.
CH 4—The signal applied to the CH 4 input con-
nector is the source of the trigger signal.
LINE—The triggering signal is obtained from a
sample of the ac power-source waveform. This
trigger source is useful when the displayed
waveform frequency is time related to the ac
power-source frequency.
CPLG (Up-Arrow and Down-Arrow) Buttons and
Indicators—Select the type of coupling of the input
trigger signal to the trigger signal amplifier and indi-
cate the coupling selected as directed by the A/B
SELECT button.
DC—Couples de and all frequency components of `
a triggering signal to the trigger circuitry.
DC coupling is useful for most signals, but it is
especially useful for providing a stable display of
low-frequency or low-repetition-rate signals.
NOISE REJ (Noise Reject)—-Couples all fre-
quency components of the input signal to the
trigger circuitry but increases the peak-to-peak
signal amplitude required to produce a trigger
event.
NOISE REJ coupling is useful for improving stabil-
ity when the trigger signal is accompanied by
low-level noise.
HF REJ (High Frequency Reject)—Attenuates
high-frequency triggering signal components
above 50 kHz.
HF REJ coupling is useful for providing a stable
display of low-frequency components of complex
waveforms and eliminates high-frequency interfer-
- ence from the trigger signal.
LF REJ (Low Frequency Reject)—Attenuates
low-frequency triggering signal components below
100 KHz and blocks the dc component of the
trigger signal.
LF REJ coupling is useful for producing stable
triggering on the high-frequency components of
complex waveforms and rejecting low-frequency
interference or power supply hum from the trigger
signal.
AC--Attenuates trigger signal frequency com-
ponents below 50 Hz and blocks the dc com-
ponent of the signal.
AC coupling is useful for triggering on ac
waveforms that have a large de offset.
REAR PANEL
See Figure 3-6 for items 40 through 42.
© ©
EXT Z-AXIS INPUT Connector—Connects external
signals to the Z-Axis amplifier for the purpose of
intensity modulating the crt display.
Signals applied to the EXT Z-AXIS INPUT do not
affect display waveshape. Signals with fast rise
times and fall times provide the most abrupt intensity
change. The active region threshold level is 1.8 V.
Z-Axis voltage above the threshold voltage
decreases the intensity, and 3.8 V or more produces
blanking. The Z-Axis signals must be time related to
the displayed signal to obtain a fixed intensity-
modulation presentation on the crt.
Fuse Holder-—Contains the primary power fuse.
Power Cord Receptacle—Connects the ac power
source to the instrument power supply.
The power cord safety-ground connection is con-
nected to the exposed metal parts of the instrument.
The power cord must be connected to a properly
grounded source for electrical shock protection.
MENU CONTROLS
See Figure 3-7 for items 43 and 44. See Section 6
“Measurement Processes” for detailed use of the menus
for making cursor measurements.
(43) Menu Select Buttons—Used to make a menu selec-
tion from the list that is displayed on the right side of
the crt.
A menu-driven function is activated by pressing the
Menu Select button next to the menu label, and the
— ey
|

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English