Time/Div Readout; Front Anel Controls And Connectors; O Erators Checkout Rocedure; General - Tektronix 7T11A Instruction Manual

Operating Instructions — 7T11A

TIME/DIV Readout

The 7T11A TIME/DIV setting selected is displayed near
the top of the CRT except when the 7T11A is used in a
oscilloscope without readout circuitry. The horizontal posi ­
tion of the readout on the CRT corresponds to the horizon ­
tal position of the oscilloscope compartment in use.
The TIME/DIV selected at the 7T11A front panel is dis ­
played on the CRT using the digits 1, 2, or 5 followed by one
or two zeros if required. The TIME/DIV readout does not
use decimal points. The displayed digits are followed by the
units-of-measure readout. With the 7T11A, the units-of-
measure displayed will be ms/div, µs/div, ns/div or ps/div. If
the VARIABLE (CAL IN) switch is in the out position, the
symbol used to indicate less than (<), is displayed preced ­
ing the TIME/DIV readout as a warning that the display is
uncalibrated. The intensity of the readout is independently
adjustable by a front panel control on the oscilloscope,
which also permits the readout to be switched off.
FRONT ANEL CONTROLS AND
CONNECTORS
All controls required for operation of the 7T11A are lo ­
cated on the front panel of the unit (see Fig. 2-2). Controls,
pushbuttons, and connectors associated with triggering are
located along the right side of the front panel and are in ­
cluded in an area outlined in green. The SCAN control,
pushbuttons, and an external input connector are in a grey
outlined area at the lower left of the panel. The remainder of
the front panel contains Sweep circuit controls, switches,
and adjustments.
A brief description of the function or operation of the
front panel controls is provided in Figure 2-2. More detailed
information is given under the heading of Detailed Operating
Information.
O ERATORS CHECKOUT

General

When shipped from the factory, the 7T11A Sampling
Sweep Unit has been calibrated to meet the specifications
listed in Section 1 and is ready to be used with a Tektronix
7000-series oscilloscope.
The following procedures are intended to demonstrate
basic instrument function. It is recommended that this pro ­
cedure be followed completely for familiarization with the
instrument. Operation of the oscilloscope and vertical plug ­
in unit (Sampling Unit) is described in the instruction man ­
uals for these units. The equipment set-up used during the
following procedure is shown in Fig. 2-3.
2-4
Figure 2-3. Equipment setup for Operators Checkout rocedure.

Before You Begin:

Refer to the Change Information at the rear of this man ­
ual for any modifications which may affect this procedure.

Test Equipment Required

The following test equipment was used in preparing the
Operators Checkout Procedure. Other test equipment
which meets the same requirements may be substituted.
When other equipment is substituted, the control settings or
setup information may need to be altered.
1. 7S1 1 Sampling Unit.
2. Sampling Head (e.g., S-1 or S-2).
ROCEDURE
3. 7000-series oscilloscope (e.g., 7704A, 7904A, or
7603).
4. Pulse generator (e.g., TEKTRONIX Type 284).
5. 50 — ohm delay line, 75 ns (Optional, for use when
pretrigger is not available; e.g., TEKTRONIX 7M11).
6. 50 -ohm coaxial cable: 5 ns delay, GR874 connec ­
tors, Tektronix Part No. 017-0512-00 (two may be required
if a delay line is used).
6176-5