Tektronix 2247A

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Controls, Connectors, and Indicators
time-related to the displayed signal to obtain a fixed Intensity-
modulated crt display.
€XT COUNTER/TIMER TIME BASE INPUT Connector—Connects
an external reference oscillator signal to the Counter/Timer. This
signal must be 1, 5, or 10 MHz +2%, with at least 1 Volt p-p ampli-
tude. The Counter/Timer will automatically switch to this signal, when
present, and provide an indication in the readout.
Fuse Holder—Contains the primary power fuse.
Power Cord Receptacle—Connects the ac power source to the
Instrument power supply.
The power cord protective-ground connection Is connected to the
exposed metal parts of the instrument. The power cord must be con-
nected to a properly grounded source for electrical-shock protection.
Menu System Controls
Refer to Figure 2-7 for location of items 43 through 49.
Menu Item Select Buttons—Select Items from the list displayed on
the
right side of a displayed menu. A Menu Item Select button that
has no corresponding menu Item does nothing when pressed. The
menu display will clear when the Item is selected (unless the SERVICE
mode CONFIGURE menu Is set for: KEEP MENU ON WHEN ITEM
SELECTED? YES). The factory settings default is NO.
You can access the Service Mode by pressing the top and bottom
Menu Item Select buttons at the same time. This should only be done
when no other menu Is displayed, as unwanted selections on the dis-
played menu could occur. See “Service Menu Features” In Section 3
for using the operational modes of the SERVICE MENU.
2247A Operators 2-21