Tektronix 2252, Operator'S Manual, Page: 93 / 114

Operators Familiarization
determine that the cursors or intensified zones mark appropriate places
on the waveform. There are waveforms, such as very narrow pulses or
multiple crossings of the trigger level within one period, that can cause
erroneous initialization with no question mark.
When LAST MEAS’MT is selected and the last measurement was
k-
s e c
-Mo rn - i /SEC -*|, or the last action was k -
s e t
360 °-H, cursors
or delays will be reinitialized as above if configured to initialize time
measurements and the instrument’s mode is appropriate.
Accuracy of the cursor or delay placement is as specified for the selected
measurement.
PRESET TV TRIG SLOPE FOR -SYNC? (Factory Settings default is
YES.) Selecting YES wiii cause the trigger slopes to preset to “ V- when
TV trig mode is selected, and the configure menu is exited. If NO is
selected, a second question is presented:
PRESET TV TRIG SLOPE FOR +SYNC? (Factory Settings default is
NO.) Selecting YES will cause the trigger slopes to preset to
- f~ when
TV trig mode is selected, and the configure menu is exited. If NO is
selected, the scope will not use a preset slope when a TV trig mode is
selected.
When the final question is answered, the SERVICE MENU display returns.
Self Cal Measurements
This selection consists of SELF CAL HARDCOPY procedure, SELF CAL
VOLT MEASUREMENTS routine, and SELF CAL TIME MEASUREMENTS
routine. The SELF CAL HARDCOPY procedure characterizes channels 1,2,
3, and 4, and horizontal position. Before performing any SELF CAL, discon-
nect ali input signals. The SELF CAL VOLT MEASUREMENTS and SELF CAL
TIME MEASUREMENTS routines do a self-characterization of the vertical
channels 1 and 2 and the horizontal timing. With the selection of SELF CAL
MEASUREMENTS, the message CALIBRATE DIGITIZER? is displayed.
When YES is selected, the SELF CAL HARDCOPY procedure is performed
first followed by the SELF CAL VOLT MEASUREMENTS and SELF CAL TIME
MEASUREMENTS routines. Selecting NO will bypass the SELF CAL
HARDCOPY procedure and run the SELF CAL VOLT MEASUREMENTS and
SELF CAL TIME MEASUREMENTS routines.
These routines and procedures store calibration constants that set the
accuracy of the internal measurement system. Hardcopy and voltage
measurements can be calibrated separately from the timing measurement by
selecting the SELF CAL item from the VOLTMETER Measurement Menu.
Timing measurement may also be calibrated separately by selecting SELF
CAL item from the TIME Measurement Menu.
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2252 Operators