Vertical Deflection Factor; Signal Connections; Ground Considerations - Tektronix 214 Instruction Manual

Vertical Deflection Factor
The amount of vertical deflection produced by a signal
applied to one of the vertical channels is determined by the
signal amplitude, the attenuation factor, and the setting of
the appropriate VOLTS/DIV switch and VAR control. The
calibrated deflection factors indicated by the VOLTS/DIV
switch apply only when the VAR VOLTS/DIV control is
set to the CAL detent.
The VAR VOLTS/DIV control provides continuously
variable (uncalibrated) vertical deflection factors between
the calibrated settings of the VOLTS/DIV switch. The VAR
VOLTS/DIV control extends the maximum vertical deflec-
tion factor to at least 125 volts/division (in the 50 volts
position).
A X10 probe attenuator is available as an optional
accessory. Order Tektronix part number 010-0378-00.
Signal Connections
Two high-impedance signal probes are internally con-
nected to the 214. These probes provide a one-megohm
input impedance and a shielded input cable to prevent
pickup of electrostatic interference. The vertical deflection
factors can be read directly from the appropriate VOLTS/
DIV switch (VAR in CAL detent).
Signals can be connected to the EXT TRIG banana jack
with short unshielded leads under most conditions. Be sure
to establish a common ground between the 214 and the
equipment under test. Attempt to position the unshielded
leads away from any source of interference to avoid errors
in triggering. If interference is excessive with unshielded
leads, use a coaxial cable with a suitable adapter.
Ground Considerations
Reliable signal measurements cannot be made unless
both the oscilloscope and the unit under test are connected
together by a common reference (ground) lead in addition
to the signal probe. The ground clips on the attached
probes provide the best ground. Also, a ground lead can be
connected to the 214 chassis COMMON banana jack to
establish a common ground with the signal source.
12 214—Operators Manual ®