Tektronix 2230 Service Manual

Operating Information—2230 Service
OPERATING CONSIDERATIONS
This part contains basic operating information and tech
niques that should be considered before attempting to
make any measurements with the instrument.
GRATICULE
The graticule is internally marked on the faceplate of
the crt to eliminate parallax-viewing errors and to enable
measurements (see Figure 2-13). The graticule is marked
with eight vertical and ten horizontal major divisions. In
addition, each major division, is divided into five subdivi
sions. The vertical deflection factors and horizontal timing
are calibrated to the graticule so that accurate measure
ments can be made directly from the crt. Also, percentage
marks for the measurement of rise and fall times are
located on the left side of the graticule.
Figure 2-13. Graticule measurement markings.
GROUNDING
The most reliable signal measurements are made when
the oscilloscope and the unit under test are connected by
a common reference (ground lead) in addition to the signal
lead or probe. The probe's ground lead provides the best
grounding method for signal interconnection and ensures
the maximum amount of signal-lead shielding in the probe
cable. A separate ground lead can also be connected from
the unit under test to the oscilloscope GND receptacle
located on the oscilloscope’s front panel.
SIGNAL CONNECTIONS
Probes
Generally, the accessory probes supplied with the
instrument provide the most convenient means of connect
ing a signal to the vertical inputs of the instrument. The
probe and probe lead are shielded to prevent pickup of
electromagnetic interference, and the 10X attenuation fac
tor of the probe offers a high input impedance that mini
mizes signal loading in the circuitry under test. The
attenuation factor of the standard accessory probe is
coded so that the VOLTS/DIV readout seen on the crt is
automatically switched to the correct scale factor when
the probe is attached.
Both the probe itself and the probe accessories should
be handled carefully at all times to prevent damage to
them. Avoid dropping the probe body. Striking a hard sur
face can cause damage to both the probe body and the
probe tip. Exercise care to prevent the cable from being
crushed or kinked. Do not place excessive strain on the
cable by pulling.
The standard-accessory probe is a compensated 10X
voltage divider. It is a resistive voltage divider for low fre
quencies and a capacitive voltage divider for high-
frequency signal components. Inductance introduced by
either a long signal or ground lead forms a series-resonant
circuit. This circuit will affect system bandwidth and will
ring if driven by a signal containing significant frequency
2-23

Tektronix 2230 Specifications

General

Brand	Tektronix
Model	2230
Category	Test Equipment
Language	English