Keysight Technologies InfiniiVision 2000, Service Manual

Page: 27 / 86

Testing Performance
2
2000/3000 X-Series Oscilloscopes Service Guide 27
7 Press the User softkey to the right of the D7 - D0 softkey, then turn the Entry
knob ( ) on the front panel of the oscilloscope to set the threshold test
settings as shown in Table 5 .
8 Do the following steps for each of the threshold voltage levels shown in Table 5 .
a Set the threshold voltage shown in the User softkey using the Entry knob on
the oscilloscope.
b Enter the corresponding DC offset voltage on the precision source front
panel. Then use the multimeter to verify the voltage.
Digital channel activity indicators are displayed on the status line at the top
of the oscilloscope display. The activity indicators for D7-D0 should show all
of the channels at digital high levels.
c Use the knob on the precision source to decrease the offset voltage, in
increments of 10 mV, until the activity indicators for digital channels D7-D0
are all at digital low levels. Record the precision source voltage in the
Performance Test Record (see page 53 ).
d Use the knob on the precision source to increase the offset voltage, in
increments of 10 mV, until the activity indicators for digital channels D7-D0
are all at digital high levels. Record the precision source voltage in the
Performance Test Record (see page 53 ).
Before proceeding to the next step, make sure that you have recorded the
precision source voltage levels for each of the threshold settings shown in
Table 5 .
Table 5 Threshold Accuracy Voltage Test Settings
Threshold voltage setting (in
oscilloscope User softkey)
DC offset voltage setting (on
precision source)
Limits
+5.00 V +5.250 V ±1 mV dc Lower limit = +4.750 V
Upper limit = +5.250 V
–5.00 V –4.750 V ±1 mV dc Lower limit = –5.250 V
Upper limit = –4.750 V
0.00 V +100m V ±1 mV dc Upper limit = +100 mV
Lower limit = –100 mV