Tektronix 2335, Инструкция по эксплуатации

Страница: 46 / 104

PROBE COMPENSATION
Misadjustment o f probe compensation is one of the
sources o f measurement error. Most attenuator probes
are equipped w ith compensation adjustments. To ensure
optimum measurement accuracy, always compensate the
oscilloscope probe before making measurements. Probe
compensation is accomplished as follows:
1. Preset instrument controls and obtain a Normal
Sweep Display (refer to "Instrum ent Fam iliarization").
2. Connect the tw o 10X probes (supplied w ith the
instrument) to the CH 1 and CH 2 input connectors.
3. Set both VO LTS/DIV switches to 0.5 m and set
both AC-GND-DC switches to DC.
4. Select CH 1 VER TICAL MODE and insert the tip of
the probe connected to the Channel 1 input connector to
the AMPL CAL output.
5. Using the approximately 1-kHz AMPL CAL square-
wave signal as the input, obtain a display o f the signal (refer
to "Instrum ent Familiarization").
6. Set the A SEC/D1V switch to display several cycles
o f the AM PL CAL signal. Use the Channel 1 POSITION
control to vertically center the display.
7. Check the waveform presentation for overshoot and
ro llo ff (see Figure 10). If necessary, adjust the probe
compensation fo r fla t tops on the waveforms. Refer to the
instructions supplied with the probe for details o f com­
pensation adjustment.
8. Select CH 2 VERTICAL MODE and connect the
Channel 2 probe tip to the AMPL CAL output.
9. Use the Channel 2 POSITION control to vertically
center the display and repeat step 7 fo r the Channel 2
probe.
10. Disconnect the probes from the instrument.
2335 Operators
33