Behavior For Horlzontal Mode Changes; Measurement Compatibility And Error Messages - Tektronix 2247A Operator's Manual

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Operators Familiarization .
Behavior for Horizontal Mode Changes
If the Horizontal MODE Is changed to a mode that cannot be used for the
active measurement, that measurement 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 measurement
mode (if no other measurement selection is made first). Sea ;Table 3-1 for
compatible and Incompatible modes.
Gated-voltage measurements will not run In SGL SEQ Trigger MODE. Any
gated Volts 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 readout Is configured to remain on in SGL SEQ).
+PEAK, -PEAK and PK-PK will not run in ALT or B Horizontal MODE unless
B
Trigger MODE Is RUNS AFTER.
Table 3-1
Behavior for Horizontal MODE Changes
Measurement Mode Compatible Incompatible
Horizontal Horizontal
Modes Modes
I~ VOLTS • I,
rh
VOLTS •
!
A, ALT, B, XY
I
I~ SEC
•
I I+- 1 /SEC
•
I, I~ PHASE
•
I
A, ALT, B
X-Y
DC A, X-Y ALT, B
+PEAK, -PEAK, PK-PK
A, ALT, B, X-Y
GATED +PEAK, GATED -PEAK, A ALT, B, X-Y
and GA TED PK-PK
FREQ, PERIOD, WIDTH, TOTALIZE,
A
ALT, B, X-Y
and FREQ RA TIO
GATED CIT (FREQ, PERIOD, WIDTH, A
ALT, B, X-Y
and EVENTS)
RISE/FALL and PROP DELAY
A
ALT, B, X-Y
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2247 A Operators
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Operators Familiarization
Measurement Compatibility and Error
Messages
Channel 1 or Channel 2 Voltmeter measurements, except DC, cannot be
made when the signal Is larger than the range, of the
B
trigger level. The
displayed error message Is "OUCH-TURN VOL TS/DIV CCW."
NOTE
When making DC measurements, overranged signals will
not cause an error message to be displayed but can display
incorrect voltage readings. To obtain accurate DC readings
keep the waveform within the graticulf! limits.
The Channel 1 or Channel 2 Voltmeter measurement of DC cannot 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.
NOTE
A maximum of eight waveforms are allowed to be displayed
when making Vo'ltmeter measurements of DC, +Peak,
.:..peak, or Peak-to-Peak measurements, while in Horizontal
ALT Mode.
The ADD mode waveforms w/11 not be displayed whl/
1
e
making voltage measurements if v;ertical ChanneJs1 1
through 4 are being displayed with their Delayed '('laveforms
(Horlz ALT Mode selected).
For +PEAK, -PEAK, and PK-PK measurements, the ac symbol ( - ) will be
displayed for AC Input COUPLING, and the ground symbol will be displayed
for GND Input COUPLING. The symbols will be displayed after the readout
units.
A question mark (?) will be displayed In front of the measurement value any
time the measurement Is uncertain. This can happen In ALT or B MODE
+PEAK, -PEAK, and PK-PK measurements.
The following measurements cannot occur when the VOL TS/DIV VAR
control for the channel being measured Is not In the detent position:
+PEAK, -PEAK, PK-PK, DC, GATED +PEAK, GATED -PEAK, GATED
PK-PK,
I+-
VOLTS
•
I, and
rh
VOLTS
•
I. The displayed error message Is
"MEAS SOURCE VAR OUT OF DETENT."
2247 A Operators
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