Tektronix 2205, Руководство оператора

Страница: 63 / 91

Checks and Adjustments
Performing the operator checks and adjustments in this section
will eliminate significant sources of measurement error and will
improve measurement confidence. If adjustments are required
beyond the scope of this section, refer the instrument to a quali­
fied service technician.
A complete performance check should be made after every
2000 hours of operation or once a year if it is used infrequently.
A shorter interval may be necessary if your instrument is sub­
jected to harsh environments or severe usage.
TRACE ROTATION
Normally, the horizontal axis of a waveform display will be paral­
lel to the center horizontal graticule line. To check horizontal
alignment and to adjust it if necessary, perform the following
procedure. A probe is not needed for this adjustment.
1. Preset instrument controls (see Learning the Controls in
Section 2) and obtain a baseline trace.
2. Use the Channel 1 POSITION control to move the baseline
trace to the center horizontal graicule line.
3. The trace should be parallel to the center horizontal graticule
line. If it is not, use a small flat-bit screwdriver to adjust the
TRACE ROTATION control on the front panel so that the trace
aligns with the center horizontal graticule line.
PROBE COMPENSATION (Optional 10X Probe)
Misadjustment of probe low-frequency compensation is a com­
mon source, of measurement error. Most attenuator probes are
equipped with compensation adjustments. To ensure optimum
measurement accuracy, always compensate the oscilloscope
probes before making measurements. Probe compensation is
accomplished as follows:
1. Preset instrument controls (as given in Learning the Con­
trols, in Section 2, Operation) and obtain a baseline trace.
2. Attach the two optional X I 0 probes to the CHI and CH2 in­
put connectors.
2205 Operator's
4-1