Tektronix DCM300, Technical Reference

Page: 374 / 382

THM500 Series Performance Verification
18
Handheld and Benchtop Instruments Basic Service
The following check verifies vertical accuracy.
1. Connect the voltage source output to the THM500 series instrument CH 1
and COM inputs as shown in Figure 7. Assure that the ground connection for
each adapter connects to the common (or ground) connector of its associated
instrument.
THM5xx
Voltage source
CH 1 COM
50 cable
BNC to dual
banana adapter
BNC to dual banana cable
Figure 7: Vertical Accuracy Test Setup
2. Use the menus to set the THM500 series instrument CH 1 CPLG to DC;
then turn the menus off.
WARNING. This test uses hazardous voltages. If you use standard banana plugs
to apply test signals to the THM500 series instrument, do not touch the exposed
conductors.
3. For each row of Table 10, perform the following steps:
a. Use the THM500 series instrument
Y
and
B
buttons to set the vertical
scale to the setting listed in the first column.
b. Set the voltage source output to the value in the second column.
c. Press the THM500 series instrument POSITION/SCALE button to
show POS; then use the
Y and B buttons to move the waveform three
divisions below the center of the graticule.
d. Press the THM500 series instrument CURSORS/TRIGGER button to
show the cursors; then use the Y and B buttons to move one cursor over
the waveform.
e. Set the voltage source output to the value in the third column, press the
THM500 series instrument SELECT button to select the second cursor,
and position the second cursor over the new waveform position.
Vertical Accuracy