Tektronix 2230, Руководство по обслуживанию

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Operating Information— 2230 Service
Figure 2-10. Side Panel.
X-Y Plotter Connections— Provide connections
for X-Axis output, Y-Axis output, and Pen Lift
control to drive an external X-Y Plotter. All
displayed waveforms and the crt readout are
transmitted over the Plotter Interface. The settling
time allowed for each movement is approximately
proportional to the distance of the movement.
Connections for Signal Ground and Shield Ground
are also provided for grounding between the
instrument and the external X-Y Plotter.
Waveforms and the Readout are plotted on the
crt while a plot is in progress.
To be fully compatible, the X-Y Plotter used must
have X and Y inputs with sensitivity control and
penlift control.
Signals available at the AUXILIARY CONNEC­
TOR allow the Pen Lift circuit to be wired for a
plotter with either active HI or active LO drive
requirements and several logic families. Examples
for both an active HI and an active LO TTL drive
are shown in Figure 2-11.
EXT CLK Input— Provides an input for EXT
CLOCK signals (up to 1000 samples per second)
to the storage acquisition circuitry in conjunction
with the EXT CLK position of the A SEC/DIV
switch. Samples are referenced by falling edges.
Input is TTL compatible. Samples become visible
by pairs, as SCAN or ROLL. Several clocks are
required before the point associated with the first
clock is visible.
Table 2-4
Auxiliary Connector
Pin Number
Function
1 EXT CLK Input
2 Pen Lift, Normally Closed
3 X Output
4
SHIELD GND
5 Y Output
6
+4.2 V
7 Pen Lift, Normally Open
8 Pen Lift, Relay Common
9 SIG GND
CRT READOUT
The Readout System provides an alphanumeric display
of information on the crt along with the waveform displays.
The readout (non MENU) is displayed in three rows of
characters. Two rows are within the top graticule division,
and the other row is within the bottom graticule division.
The locations and types of information displayed under
normal operating modes are illustrated in Figure 2-12.
NON STORE Mode
In NON STORE mode the current settings of the
VOLTS/DIV and SEC/DIV switches are displayed.
Greater-than symbols (> ) are used to indicate uncalibrated
VOLTS/DIV and SEC/DIV switch settings. A down-arrow
symbol (!) is used in front of the CH 2 VOLTS/DIV readout
to indicate CH 2 INVERT. For Horizontal Display Mode of
BOTH and B only, the DELAY TIME POSITION readout is
also displayed. The AC-GND-DC input coupling selection is
indicated in the associated VOLTS/DIV readout with a tilde
symbol (-) above the volts symbol for AC, a ground sym­
bol ( rh ) for GND, and no extra symbol for DC input cou­
pling.
2-20