Tektronix 2247A

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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 VOLTS/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 graticule 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 elght waveforms are allowed to be displayed
when making Voltmeter measurements of DC, +Peak,
-Peak, or Peak-to-Peak measurements while in Horizontal
ALT Mode,
The ADD mode waveforms will not be displayed while
making voltage measurements if Vertical Channels 1
through 4 are being displayed with their Delayed waveforms
(Horiz 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
tlme 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 VOLTS/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, + VOLTS, and “7 VOLTS-4. The displayed error message Is
“MEAS SOURCE VAR OUT OF DETENT.”
2247A Operators 3-33