Owner`s manual

4. Rotate

Zero Level

to position the zero reference

line:

a.On the bottom of the computer display until the

indicator appears on the screen to get the

maximum positive (+) measurement, or

On the top of the computer display until the in-

dicator appears on the screen to get the maxi-

mum negative (–) measurement.

b.Slowly re-adjust

Zero Level

in the opposite

direction until just past the point where the or

indicator disappears from the oscilloscope

screen on the computer’s display.

Notes

• The grid must be turned on)

• The reference line on the oscilloscope display

should be set to just above the bottom line or

just below the top line on the grid.

• The position on the grid overlay depends on

the input signal’s polarity and amplitude, but

should be chosen so the trace lies along one of

the grid overlay’s major divisions. If the trace is

widened by stray interference, ground the

probe body near the point being measured.

The trace position is the voltage reference line

and all voltage measurements are read in

respect to this line. (Do not adjust the vertical

positioning control after the reference is estab-

lished.)

5. Set

INPUT COUPLING

6. If it was necessary to ground the tip (see Step 3

note), remove the tip from the ground or reference

voltage. This readies the tip so you can use it to

make a measurement.

22-310.fm Page 25 Friday, August 6, 1999 12:26 PM