Reference
3-28
370B User Manual
General Operating Information
The 370B CRT has a permanently-etched, 10 x 10 internal graticule. Illumina-
tion of the graticule is controlled by the GRAT ILLUM control. A protective
shield for the CRT is fitted between the bezel and the CRT.
A blue filter is provided to improve the contrast of the display under high
ambient lighting conditions.
The readout, located on the right of the graticule and referred to as the Setup
Readout, consists of the alpha-numeric displays and titles for each. The
alphanumeric displays show numbers and units (e.g., 5 mA, 2 V), the values of
which are a function of front panel or GPIB programmed control settings. The
titles are words etched to the CRT. These words indicate the characteristics of the
CRT display to which each alphanumeric display is related (e.g., VERT/DIV,
PER STEP, etc.). Illumination of the alphanumeric displays is controlled by the
READOUT/CURSOR control, and illumination of the titles is controlled by the
GRAT ILLUM control. The 370B CRT has six other readouts: TEXT, ERROR
MESSAGE, AUX SUPPLY, CURVE/SETUP ID, DISPLAY OFFSET, and
AVERAGE COUNT. Illumination of these readout displays is controlled by the
READOUT/ CURSOR control.
The NON STORE/STORE/VIEW intensity control regulates the intensity of the
NON STORE, STORE, or VIEW curve. This control should be adjusted so that
the display is easily visible but not overly bright. Readjustment may be required
for different displays.
Use particular care when displaying a spot. A high intensity spot may
bum the CRT phosphor and cause permanent damage to the CRT.
The intensity of the REF curve is controlled by the REF intensity control , and
the intensity of the readouts and the cursors (except the dot) is controlled by the
READOUT/CURSOR intensity control. The dot intensity cannot be adjusted
independently.
The focus of the CRT display is controlled by the FOCUS control. This control
should be adjusted for optimum display definition.
In the vertical dimension, the display on the CRT measures either collector
current (I
C
), base current (I
B
), emitter current (I
E
), or the output of the Step
Generator. The Collector Supply POLARITY controls, the VERTICAL
CURRENT/DIV control, and the CONFIGURATION controls determine which
of these measurements are made.
CRT
Readout
Intensity
Focus
Vertical Measurement and
Deflection Factor
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General