10
IM 701450-61E
4
Correcting (Deskewing) the Difference in the
Transfer Time of Analyzed Signals
Procedure
• To exit the menu during operation, press
ESC
located
above the soft keys.
• In the procedural explanation below, the term
jog shuttle & SELECT
refers to the operation of
selecting/setting items and entering values using the
jog
shuttle
,
SELECT
and
RESET
keys. For details on the
operation using the jog shuttle, SELECT, and RESET, see
sections 4.1 or 4.2 in the
DL7440/DL7480 User’s Manual
.
• For a description of the operation using a USB keyboard or
a USB mouse, see section 4.3 in the
DL7440/DL7480
User’s Manual
.
X-Y
PHASE
MENU
MENU
SETUP
FILE
MISC
RESET
SELECT
MATH
SHIFT
GO/NOGO
CURSOR
MEASURE
HISTORY
ACQ
START/STOP
IMAGE SAVE
DISPLAY
Connecting the Deskew Correction Signal Source
Depending on the probe that is being used, a difference in the transfer time may occur
between voltage and input signals. Connect the deskew correction signal source,
voltage probe (passive probe or differential probe) and current probe to the DL7400.
1.
Connect the voltage probe (passive probe or differential probe) and current
probe to the deskew correction signal source.
For the connection procedure, see the manual for the deskew correction signal source. For
information on the handling when the YOKOGAWA 701935 Deskew Correction Signal Source
is used, see the
Deskew Correction Signal Source User’s Manual IM701935-01E
.
2.
Connect the voltage probe and current probe to the DL7400 as shown below.
For a description on the pair of channels for applying the voltage and current signals
when measuring power analysis parameters, see page 6 in this manual.
3.
Set the attenuation for the voltage probe and current-to-voltage conversion ratio
for the current probe.
•
Turn ON the power analysis function and set the attenuation and current-to-voltage
conversion ratio according to the procedures given in chapter 3 in this manual or set
the attenuation and current-to-voltage conversion ratio according to the procedures
given section 5.5 of the
DL7440/DL7480 User’s Manual IM701450-01E
.
•
For a current probe, perform degauss and zero adjustment. In the case of the current
signal that the YOKOGAWA 701935 Deskew Correction Signal Source outputs,
perform zero adjustment with the vertical sensitivity (V/div, see section 5.2 in the
DL7440/DL7480 User’s Manual
) set to 20.0 mA/div. If zero adjustment is not performed
correctly, auto deskew may not be possible.
DL7400
CH1
CH2
Voltage probe
Current probe
Executing the Deskew
Execute deskew after the warm-up time of the DL7400 and other equipment (as
necessary) has elapsed.
4.
Press
MISC
. The MISC menu appears.
5.
Press the
Calibration
soft key. The Calibration menu appears.
You can also display the Calibration menu by selecting To Deskew in the Power Analyze
Setup dialog box described in section 3 of this manual and pressing SELECT. If you jumped
from the Power Analyze Setup dialog box to the Calibration menu, check that the attenuation
of the voltage probe and current-to-voltage conversion ratio of the current probe have been set
properly and degauss and zero adjustment have been performed correctly.
