Fluke 9500B - Measurement of UUT Oscilloscope Channel Skew

Section 4: Using the Model 9500B — Zero Skew Function 4.14-3
Final Width = 215mm
Descriptions assume 9500B/1100
4.14.5.1 Introduction
The procedure depends on pre-alignment of
the requisite number of active heads (if better
than ±50ps calibrator alignment is required —
when UUT specification is <200ps or better),
as broadly described in para 4.14.4.1.
4.14.5.2 Interconnections
Connect the required active heads to the UUT
oscilloscope input channels.
4.14.5.3 9500B and UUT 'Scope
Setup
The following procedure assumes that the
9500B instrument is in Manual Mode. It is also
assumed that the user will be familiar with
front panel operation. In case of difficulty, re-
read the paragraphs earlier in this Section 4.
1. Preparation
Ensure that both instruments are powered ON
and warmed up.
2. UUT 'Scope
Select the required function for input channel
skew test.
3. 9500B
Ensure that the 9500B is in Zero Skew function
with Output OFF. If in any other function,
press the 'Aux' key on the right of the
'OSCILLOSCOPE CALIBRATOR' panel,
then the
soft key on the right of the
screen.
Ensure that the required channels are selected
and, if necessary, have been 'Precision Aligned'.
4.14.5.4 Sequence of Operations
Refer to the table or list of UUT Oscilloscope
Input delay measurement points in the UUT
Oscilloscope Manufacturer's Test Guide.
Follow the sequence of test stages as directed
by the guide, and carry out the following
operations (1) to (5) at each stage.
1. UUT 'Scope
a. Select the correct signal test channels.
b. Select trigger for the test from the correct
channel.
c. Select the correct Y sensitivity range.
d. Select the correct timebase speed for the
test.
e. If required, adjust the sweep speed and
trigger level for a stable display.
2. 9500B
Set Output ON.
3. UUT 'Scope
a. Adjust each channel Y position control to
superimpose the waveforms, equally
disposed across the X axis.
b. Use the UUT oscilloscope controls to
measure the relative delays on each channel
(at half amplitude).
4. UUT Response
Record the UUT input channels' relative delays
as detailed in the UUT Oscilloscope
Manufacturer's Test Guide.
5. 9500B Set Output OFF.
4.14.5 Measurement of UUT Oscilloscope Channel Skew