Tektronix 2246 - Error Messages

Operating Information— 2246 Operators
ERROR MESSAGES
CH2
INPUT
COUPLING
CH2
VOLTS/DIV «~
CH1
INPUT
COUPLING
CH1
VOLTS/DIV
CH1
UNCAL a
INDICATOR —— ig
ADD CH2
INPUT
COUPLING
MODE
|
UNCAL
SYMBOLS
AC = N
BW LIMIT
CH2 INDICATOR
INVERT
CH3
VOLT/DIV
CH4
VOLTS/DIV
A
SEC/DIV
X10
SEC/DIV
OR
X-¥
SEC/DIV MODE
UNCAL INDICATOR
INDICATOR
Figure 4-2. 2246 Readout display locations.
The standard 10X probes supplied with this instrument
offer a high input impedance that minimizes circuit loading.
This allows the circuit under test to operate with a
minimum of change from the normal, unloaded condition.
Also, the subminiature body of these probes has been
designed for ease of use when probing circuitry containing
close lead spacing.
The probe itself and the probe accessories should be
handled carefully at all times to prevent damage. Striking a
hard surface or dropping the probe body can cause dam-
age to both the body and the probe tip. Use care to
prevent the cable from being crushed or kinked, and do
not place excessive strain on the cable by pulling it.
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
long signal or ground leads may form a series-resonant
circuit. This resonant circuit will affect system bandwidth
. and will oscillate (ring) if driven by a signal containing
4-2
significant frequency components at or near its resonant
frequency. Ringing can then appear on the scope display
and distort the true signal waveform. Always keep both
the ground lead and the probe signal-input connections as
short as possible to maintain the best waveform fidelity.
Misadjustment of probe compensation is a common
source of measurement error. Because. of variations in
oscilloscope input characteristics, probe compensation
should be checked and adjusted, if necessary, whenever a
probe is moved from one oscilloscope to another or
between channels of a multichannel oscilloscope. The
probe compensation adjustment procedure is found in
“Operator's Checks and Adjustments,” Section 5 of this
manual and in the instructions supplied with the probe.
SCALE FACTOR SWITCHING. The VOLTS/DIV scale
factors are displayed on the CRT. The VOLTS/DIV
readout always reflects the correct scale factor in
response to a control change or as a result of change in
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