Self Cal Measurements; Internal Settings Menu - Tektronix 2247A Operator's Manual

Operators Familiarizati6n
If the reference cursor Is appropriate to the measurement mode,
It will be set as specified for the reference delay with the assump-
tion that the sweep start Is at the left graticule line.
The delta cursor or delta delay, as appropriate to the measure-
ment, will be set one period of the trigger signal to the right of the
reference cursor or delay, If possible; If not possible, it will remain
unchanged.
•i
Cursors and delays may remain unchanged If:
( 1 ) there Is no A trigger, or
(2) the trigger source channel's signal has a repetition rate
slower than 20 Hz or faster than 100 MHz.
Under the conditions of 1 and 2 above, a question mark may appear
before the measurement value and remain until the ~ or I+- knob Is
moved. The user should, however , always Inspect the display to
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
I+-
SEC~ or
I+-
1/SEC ~. or the last action was
I+-
SET 360°~.
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 will cause the trigger slopes to preset to " - " 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 "+" 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 flnal question Is answered, the SERVICE MENU display returns.
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2247 A Operators
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Operators Familiarization
Self Cal Measurements
This selection does a self-characterization of the vertical channels 1 and 2
and the horizontal timing. The SELF CAL MEASUREMENTS routine stores
calibration constants that set the accuracy of the Internal measurement
system . Voltage or time measurements can be calibrated separately by
selectlng the SELF CAL item from the VOL TMl=TER or TIME Measurement
Menus .
NOTE
CALIBRATE MEASUREMENTS or SELF CAL can be
perf-ormed anytime after a 20-minute warmup to ensure the
accuracy stated In Section 6 .
Internal Settings Menu
The INTERNAL SETTINGS ME~U consists of MAKE FACTORY SETTINGS ,
LOAD STORE/RECALL STORED SETUPS , and ADJUST VERTICAL
OUTPUT. All · INTERNAL SETTINGS menu items , except ADJUST
VERTICAL OUTPUT , are for use by the operator . To return to the main
SERVICE MENU, press the up-arrow key to underline INTERNAL _
SETTINGS MENU and press the button agafn to display the SERVICE
MENU. To return to the oscilloscope mode, select QUIT from the
INTERNAL SETTINGS MENU or SERVICE MENU , or, press th~ CLEAR
DISPLAY button.
MAKE FACTORY SETTINGS-Sets the front - panel controls and
menu configurations as described In Appehdlx B .
INTERNAL SETTINGS MENU/
MAKE FACTORY SETTINGS
0
f
MENU
LOAD STORE/RECALL SETUPS
l
ADJUST VERTICAL OUTPUT
QUIT
Internal Settings Menu
2247 A Operators
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