Fluke 9500B - Menu Selections; Zero Skew Operation

4.14-2 Section 4: Using the Model 9500B — Zero Skew Function
Final Width = 215mm
Descriptions assume 9500B/1100
4.14.3.2 Right Side Screen Keys —
Digit Edit/Sequence Scroll
Keys operate only on the value of Frequency/
Period:
X10 Multiplies the marked value by ten.
÷10 Divides the marked value by ten.
Press to change display from
Frequency to Period.
Press to change display from Period
to Frequency.
4.14.3.3 Right Side Screen Keys —
Numeric Entry
Right side screen keys operate on the value in
the edit box, and acting in place of the ↵ key,
exit from Numeric Entry back to Digit Edit/
Sequence Scroll; then set the value as evaluated
in the box:
Keys operate only on the value of Frequency/
Period:
X10 Multiplies the marked value by ten.
÷10 Divides the marked value by ten.
Hz Evaluates the number in the box in
Hertz.
kHz Evaluates the number in the box in
Kilohertz.
MHz Evaluates the number in the box in
Megahertz.
GHz Evaluates the number in the box in
Gigahertz.
1
2
5
1.Ø
5
2
1
1.Ø
4.14.3 Menu Selections (Contd.)
1
1
4.14.3.4 Bottom Screen Keys
ADJUST Press to select Precision Alignment
ALIGN to adjust the alignment on each
active channel, and store the result.
DEFAULT After Precision Alignment has been
ALIGN stored, toggles between Default and
Precision Alignment.
CHANNEL Permits Zero Skew to be selected
SELECT for any two or more of the five
channels, providing that active
heads are fitted to those channels
(para 4.14.3.1).
Press to select Direct Mode (paras
4.4.3/4).
Press to select Scope Mode (sets
the step sequence to '1, 2, 5' or
'1, 2, 2.5, 4, 5' as chosen using the
Preferences key) (paras 4.4.1/2).
4.14.4 Zero Skew Operation
4.14.4.1 Precision Alignment of
9500B Channel Outputs
The 9500B is set into Zero Skew function.
Two or more channel heads are aligned, in
turn, on the same input channel of an
oscilloscope (can be the UUT oscilloscope),
while triggering from another channel or
external trigger.
Precision Alignment
Using Zero Skew function, 'CHANNEL
SELECT' is used to select the channels for
adjustment.
With output off, a channel active head is
connected into the scope input channel to be
used. At the required frequency, with output
on, the channel delay at half-amplitude is
marked using a cursor (also, by pressing the
'ADJUST ALIGN' soft key, the channel delay
can be adjusted, for a particular screen
alignment).
With output off, the first active head is removed
and a second channel's head is connected into
the same scope input channel. With output on,
'ADJUST ALIGN' allows the second channel
delay to be adjusted to the same cursor mark.
Repeating the adjustment for all other channels
achieves accurate common alignment.
Having aligned the selected output channels,
they can be used to apply signals simultaneously
to measure the relative delays between the
input channels of a UUT oscilloscope.
4.14.4.2 Preservation of Alignment
The 9500B Zero Skew function will allow
only the aligned channels to be used together
with their aligned heads. Unless channels
have been reconfigured, merely selecting
another function will not destroy the alignment
when Zero Skew function is again entered.
Deselecting a channel allows the other aligned
channels to be used. Reselecting the deselected
channel restores the alignment if the same
head is fitted.
If one of the heads is removed from its output
channel, and another substituted, the 9500B
will recognize the new head as being unaligned,
and will not allow it to be used until another
precision aligment has been carried out.