Reference
3-30
370B User Manual
In the horizontal dimension, the display on the CRT measures one of the
following:
1. Collector to emitter voltage (V
CE
).
2. Collector to base voltage (V
CB
).
3. Base to emitter voltage (V
BE
).
4. Emitter to base voltage (V
EB
).
5. Step Generator output.
The HORIZONTAL VOLTS/DIV control, the CONFIGURATION switches and
the vertical parameter determine the horizontal parameter.
The horizontal deflection factor of the display on the CRT is controlled by the
HORIZONTAL control and the MAG switch. The HORIZ/DIV readout of the
CRT indicates the horizontal deflection factor.
When collector current is the vertical measurement parameter (CONFIGU-
RATION is set to the EMITTER COMMON group except the COLLECTOR
OPEN), V
CE
or V
BE
is displayed on the horizontal axis. To measure V
CE
, the
HORIZONTAL control must be set within the COLLECTOR range that has
deflection factors between 50 mV/division and 500 V/division. To measure V
BE
,
the HORIZONTAL control must be set on a BASE/EMITTER range that has
deflection factors between 50 mV/division and 5 V/division. In both cases, the
horizontal deflection factors are indicated by the HORIZ/DIV readout.
When CONFIGURATION is set to the BASE COMMON group, the horizontal
display measures collector to base voltage (V
CB
) with the HORIZONTAL
control in the COLLECTOR range, or emitter to base voltage (V
EB
) with the
HORIZONTAL control in the BASE/EMITTER range. It should be noted that
V
EB
in this case does not indicate a measurement of the emitter-base voltage
under a reverse-biased condition. It is a measurement of the forward-biased
base-emitter voltage with the horizontal sensing leads reversed.
When CONFIGURATION is set to BASE COLLECTOR SUPPLY, the only
significant measurement made by the horizontal display is V
BE
. To measure
V
BE
, the HORIZONTAL control must be set within the COLLECTOR range.
When emitter current is being measured by the vertical display, the only
significant measurements made by the horizontal display are V
CE
and V
CB
.
When making these measurements, the HORIZONTAL control should be set
within the COLLECTOR range.
When the HORIZONTAL control is set to STEP GEN, steps indicating the Step
Generator output are displayed horizontally. The horizontal display shows one
step per division and the amplitude of each step, as shown by the PER STEP
readout determines the horizontal deflection factor.
The horizontal deflection factor can be increased by 10 times for any of the
previously mentioned measurements by setting the MAG control to X10. The
magnified horizontal deflection is indicated by the HORIZ/DIV readout.
Horizontal Measurement
and Deflection Factor
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General