Controls. Connectors; Functional Check; Setup Procedure - Tektronix 7B80 Instruction Manual

Section 1-7880
The 7680 Time-Base unit operates with a Tektronix 7700-, 7800-, and 7900-series oscilloscope mainframes and a 7A-series
amplifier unit to form a complete oscilloscope system. This section describes the operation of the front-panel controls and
connectors, provides general operating information, a functional check procedure, and basic applications for this instrument.
INSTALLATION
The time-base unit is designed t o operate in the horizontal
plug-in compartment of the mainframe. This instrument
can also be installed in a vertical plug-in compartment t o
provide a vertical sweep on the crt. However, when used in
this manner, there are no internal triggering or retrace
blanking provisions, and the unit may not meet the specifi-
cations given in Section 2.
To install the unit in a plug-in compartment, push
it
in until
it fits firmly into the compartment. The front panel of the
unit should be flush with the front panel of the mainframe.
Even though the gain of the mainframe is standardized, the
sweep calibration of the unit should be checked when in-
stalled. The procedure for checking the unit is given under
Sweep Functions in the Functional Check procedure in this
section.
To remove the unit, pull the release latch (see Figure 1-1)
t o disengage the unit from the mainframe, and pull it out of
the plug-in compartment.
CONTROLS, CONNECTORS, AND INDICATORS
All controls, connectors, and indicators required for the
operation of the time-base unit are located on the front
panel. Figure 1-2 shows and provides a brief description of
all front-panel controls, connectors, and indicators. More
detailed information is given in the General Operating
Instructions.
FUNCTIONAL CHECK
The following procedures are provided for checking basic
instrument functions. Refer t o the description of the con-
trols, connectors, and indicators while performing this pro-
cedure. If performing the functional check procedure
reveals a malfunction or possible improper adjustment, first
check the operation of the associated plug-in units, then re-
fer t o the instruction manual for maintenance and adjust-
ment procedures.
Setup Procedure
1. Install the time-base unit being checked in the A hori-
zontal compartment of the mainframe.
2. Install an amplifier plug-in unit in a vertical compart-
ment.
3. Set the time-base unit controls
as
follows:
SLOPE
MODE
COUPLING
SOURCE
POSITION
TIMEIDIV
VARIABLE
(CAL IN)
HOLD OFF
MAG
(+I
P-P AUTO
AC
I NT
Midrange
1 ms
Calibrated (Pushed in)
MIN (fully counter-
clockwise)
X I (pushed in)
4. Turn on the mainframe and allow a t least 20 minutes
warmup.
RELEASE
LATCH
1958-3
Fig. 1-1. Location of release latch.
Scans by ArtekMedia O 2006