Tektronix 222 Operator's Manual page 95

More On How It Works-222 DSO Operators
6.2 PROBES
The exposedprobe tips are very sharp to aid
in
probing
through resist and oxide layers. When placing the
probes
in
the side pouch, use care not to stick your
fingers or the material of the pouch with the probe tips.
The two probes are permanently connected to the oscilloscope.
When not in use, they can be stored in the probe pouch along the right
side of the instrument.
The two channels are fully isolated and independently floatable. A
label on the probe cable next to the probe body identifies the vertical
channel ( CHANNEL 1 or CHANNEL 2). The probe attenuation factor
is 3 and is automatically reflected in the VOLTS/DIV readouts.
Probe accessories include a retractable hook tip, a probe common
shroud, an IC lead protection shroud, and a detachable probe com-
mon lead for each probe (see Figure
6-1).
The hook tip permits hands
free operation when connecting to easily assessible test points (usu-
ally a component lead or test point connector). When probing circuit
board runs and other points in tight access locations, install the probe
common shroud after removing the hook tip. The exposed sharp
probe tip will connect through resist and oxide layers while the shroud
prevents accidental contact of the probe common lead to adjacent
circuitry. Use the IC lead protection shroud on the probe tip when test-
ing integrated circuit devices. The shroud leaves the sharp probe tip
exposed, but it prevents either the probe tip itself or the probe com-
mon contact from shorting across adjacent IC leads.
The detachable probe common lead is used to connect the oscillo-
scope input common to the reference point of the circuit being tested.
The probe common lead is not chassis ground and may be con-
nected to an active circuit component.
A
true voltage waveform
across a component may be viewed (see para. 5.3).
REV JUN 1989 6 -3