Table of Contents
Advertisement
Operating Instructions— 221
should not be required. If adjustment is needed, perform the
following procedure:
1. Preset instrument controls and obtain a baseline trace.
2.
Use the Channel 1 POSITION control to move the
baseline trace to the center horizontal graticule line.
3.
If the resulting trace is not parallel to the center hori
zontal graticule line, use small flat-bit screwdriver to adjust
the TRACE ROTATION control and align the trace with the
center horizontal graticule line.
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.
2-10
Service
5A
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 2-9). If necessary, adjust the probe com
pensation for flat tops on the waveforms. Refer to the in
structions
supplied
with
the
compensation adjustment.
8.
Select CH 2 VERTICAL MODE and connect the Chan
nel 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.
KX
9<
1C
....
Figure 2-9. Probe compensation.
probe
for
details
of
CORRECT
(FLAT)
OVER C O M
PENSATED
(OVERSHOOT)
r ~
UNDER C O M
PENSATED
(ROLLOFF)
C4732-15
Advertisement
Table of Contents
Troubleshooting
