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Operators
Familiarization-2215A
Operators
PROBE COMPENSATION
Misadjustment of probe compensation is a common
source of measurement error.
Most
attenuator probes are
equipped with a compensation adjustment. To ensure opti-
mum measurement accuracy, always compensate the oscil-
loscope probes before making measurements. Probe
compensation is accomplished as
follows:
1 . Preset
instrument
controls and obtain a baseline
trace.
2. Connect the two 10X probes (supplied
with
the instru-
ment) to the CH
1
and CH 2 input connectors.
3. Set both VOLTS/DIV switches to 10 mV and set both
Input Coupling
switches
to DC.
4. Select CH 1 VERTICAL
MODE
and insert the
tip
of
the Channel
1
probe into the PROBE ADJUST output jack.
5. Using the approximately 1 kHz
PROBE
ADJUST
square-wave
signal
as the input, obtain a 5-division display
of the signal.
6. Set the A SEC/DIV switch to display several cycles of
the
PROBE ADJUST
signal.
Use the Channel
1
POSITION
control to vertically center the display.
7. Check the waveform presentation for overshoot and
rolloff
(see
Figure 3-2). If necessary, adjust the probe com-
3-4
pensation for flat
tops
on
the
waveforms. Refer to the in-
structions
supplied
with
the
probe
for
details
of
compensation adjustment.
8. Select CH 2 VERTICAL MODE and connect the
Channel
2 probe tip
to
the PROBE ADJUST output jack.
9. Use the Channel 2 POSITION to vertically center the
display and repeat step
7 for
the Channel 2
probe.
10. Disconnect the probes
from
the
instrument.
CORRECT
(FLAT)
OVER COM-
PENSATED
IOVERSHOOTI
Figure
3-2.
Probe
compensation.
UNDER
COM-
PENSATED
(ROLLO
Ff
I
4732-15
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