Tektronix 2246 User Manual

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MODE” to be displayed for two seconds. Changing the
Horizontal
MODE
to
X-Y
after
I-
SEC
-i
has
been
activated, will cancei the measurement with no
message.
l- 1/SEC -i—Measures the time difference in frequency
units (hertz) between the cursor positions in A Horizon-
tal MODE or between the delay-time setting and the
deita-delay time setting in either ALT or B Horizontal
MODE. Measurement points are the left ends of the
two intensified zones in ALT Horizontal MODE.
i- PHASE ~I—Calls up a lower level menu for phase
measurement operation.
l- PHASE -I-— Cursor positioning or delay and delta
time setting is identical to the l- SEC +! mode. The
value displayed for the phase-measurement readout
has units of degrees and is calculated by the following
formula:
(time difference) x (360)
{reference time}
The reference time is the number of divisions set as the
reference for 360 degrees using the l- SET 360° -l
menu selection that appears along with the l- PHASE -I
choice when phase measurements are selected. If the
reference is already set to the desired reference value,
pressing the I- PHASE -l menu selection exits the
menu and activates the phase-measurement mode.
l- SET 360° -I-—-Permits resetting of the 360° refer-
ence for the l- PHASE -f measurements. Cursor
difference or DELAY TIME to ATIME difference is taken
as the reference value when exiting the SET 360° refer-
ence function. Set the desired time that represents the
complete 360 degrees of a reference waveform using
the l- or DELAY and -f or A controls then select
l- PHASE -i to exit the menu and continue the phase
measurement. Recalling the LAST MEAS’MT when
l- PHASE -| was the last selected measurement mode
recalls the 360 degree reference as well.
SELF CAL-—Self characterizes the horizontal system.
SELF CAL may be performed at any time. Suggested
times are: after a warmup period, whenever the
ambient operating temperature changes by + 15°C,
and just prior to making any time measurements requir-
ing the best possible accuracy.
BEHAVIOR FOR HORIZONTAL
MODE CHANGES
if the Horizontal MODE is changed to a mode that can-
not be used for the active measurement, that measure-
Measurement Processes and Applications-—2246 Operators
ment will be canceled without a message being displayed.
Returning to a mode that may be used and pressing the
LAST MEAS'MT button will restore the canceled measure-
ment mode (if no other measurement selection is made
first). See Table 6-2 for compatible and incompatible
modes,
The only Trigger MODE restriction is that gated-voltage
measurements will not run in SGL SEQ Trigger MODE.
Any gated measurement that is active will be canceled if
SGL SEQ Trigger MODE is selected. If a gated-voltage
measurement is selected while SGL SEQ is also selected,
the message “NOT ALLOWED IN SSEQ” is displayed for
two seconds (only if the menu is configured to remain on
after the selection is made).
MEASUREMENT COMPATIBILITY
AND ERROR MESSAGES
The CH1/CH2 VOLTMETER measurements cannot be
made when the signal is larger than the range of the B
trigger level. The displayed error message is "OUCH—
TURN VOLTS/DIV CCW.”
The CHI/CH2 VOLTMETER measurement of DC can-
not be made with the Input COUPLING set to AC; the
displayed error message is "CH 1 (or CH 2) — SELECT
DC COUPLING.” If GND Input COUPLING is in use, a
ground symbol is displayed after the readout value.
For +PEAK, —PEAK, and PK-PK measurements, the
ac symbol (~) will be displayed in AC input COUPLING,
and the ground symbol will be displayed in GND Input
COUPLING. The symbols will be displayed after the
readout units.
The following measurements cannot occur when the
VARIABLE VOLTS/DIV knob for the channel being meas-
ured is not in the detent position: + PEAK, —PEAK, PK-
PK, DC, GATED +PEAK, GATED —PEAK, GATED PK-
PK, l- VOLTS 3-1, and rh VOLTS +1. The displayed error
message is “VAR VOLTS/DIV OUT OF DETENT.”
The following measurements cannot occur when the
VARIABLE SEC/DIV knob for the channel being measured
is out of the detent position: Ik SEC ~I, f- 1/SEC +l,
i- PHASE ~l, and l- SET 360° +1. The displayed error
message is “VAR SEC/DIV OUT OF DETENT.”
When in ALT or B Horizontal MODE, and the B Trigger
MODE is not RUNS AFTER, a question mark will appear
6-5

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English