Model 130B Sect.11 Page 1
SECTION II
OPERATING INSTRUCTIONS
2-1 CONTROLS AND TERMINALS TRIGGER LEVEL -
This continuous control selects the level on the
Front panel operation controls are shown in Fig-
sync waveform where triggering is to occur. When
ure 2-1. This description of the operating controls
the TRIGGER LEVEL control is set to zero, the
enables you to operate the instrument if you have
trigger circuits are the most sensitive.
a basic knowledge of oscilloscope technique. De-
tailed operating procedures are given in the oper-
ating plates.
TRIGGER SLOPE -
This two-position switch, concentric with TRIGGER
LEVEL, permits triggering to occur on either the
positive or negative slope of internal, external or
INTERNAL SWEEP CONTROLS line voltage sync signals.
SWEEP TIME/CM -
This switch determines the speed at which the Horizontal or Sync INPUT -
crt beam crosses the screen. HORIZ. SENSl- A set of three binding posts used for receiving
TIVITY switch must be in an INT. SWEEP posi- external sync voltages and external generated
tion or internal sweeps are not generated. Associ- sweeping voltages. On the rack mount model only,
\ 1
ated with the SNEEP TIME/CM switch is a con- a 3-conductor receptacle 5102, mounted at the
centric VERNIER which provides continuous ad- rear of the instrument, is connected in parallel
justment of sweep speed between steps. A X5 with the binding posts.
sweep magnifier operates on all ranges.
SYNC - 2-2 REAR-ACCESS TERMINALS
This three position switch lets the sweep be trig-
------DANGER- HIGH VOLTAGE-----
gered either internally or externally. Internal
triggering can be accomplished from a line fre- The following terminals are accessible through
quency signal or from an applied vertical input the rear access plate of the instrument cabinet:
signal of sufficient amplitude to produce a one- Horizontal and vertical deflection plates, and a
half centimeter deflection. External triggering terminal for crt intensity (Z-axis) modulation.
can be produced by signals havingamplitude greater See Figures 2-8 and 2-10.
than 0.5 volt, peak-to-peak.
2-3 WARM-UP DRIFT
SWEEPMODE -
As this control is rotated from the extreme clock- When the oscilloscope is first turned on, drift in
wise position, the sweep generator will pass from the trace will be quite noticeable, particularly
an un-synchronized free-running (FREE RUN) con- at high sensitivities, the trace drift is fastest
dition through a condition where only triggered immediately following turn-on, becoming slower
operation is possible (TRIGGERED) to a position as the instrument warms up, Because of this
in which sweeps will not occur. At the extreme drift, fine adjustment of amplifier balance should
counterclockwise position the control switches not be attempted until the instrument is thoroughly
into a PRESET position. This position provides warm. For most purposes a 5 minute warm-up
optimum triggering bias for nearly all waveforms. will be adequate. |
ACEC
HEWLETT-PACKARD
