6
IM 701450-61E
2
Connecting Probes/Performing Phase Correction,
Degauss, and Zero Adjustment/Deskewing
Connecting the Probes
To measure power analysis parameters, voltage and current signals must be applied to
predefined signal input terminals (channels). The following figure shows the channels for
applying the signals and the channel pairs (combinations) when measuring power
analysis parameters.
Signal Input Terminal
Input Signal
Channel Pair When Measuring Power
(Channel)
Analysis Parameters
CH1
Voltage
Measures power analysis parameters on the
CH2
Current
voltage and current applied to CH1 and CH2.
CH3
Voltage
Measures power analysis parameters on the
CH4
Current
voltage and current applied to CH3 and CH4.
CH5
Voltage
Measures power analysis parameters on the
CH6
Current
voltage and current applied to CH5 and CH6.
*
CH5 and CH6 can be used only on the DL7480.
Connect the voltage probes (passive probes or differential probes) and current probes to
the signal input terminals of the DL7400 and the probe power terminals on the rear panel
of the DL7400 as necessary. For the precautions to be taken when connecting probes
and descriptions on the current capacity of the DL7400 probe power supply and other
items, see section 3.4 in the
DL7440/DL7480 User’s Manual IM701450-01E
.
Compensating Voltage Probes (Phase Correction)
After connecting the voltage probes to the signal input terminals, perform phase
correction on probes that can be phase corrected.
For a description of the handling of voltage probes, see the manual that came with the product.
For instructions on the phase correction of probes, see section 3.5 in the
DL7440/
DL7480 User’s Manual
.
Degaussing Current Probes and Performing Zero Adjustment
After connecting the current probes to the signal input terminals, perform degaussing
1
and zero adjustment
2
of the current probes before making measurements if such
functions are available.
For a description of the degaussing and zero adjustment as well as the handling of
current probes, see the manual that came with the product.
1 Degauss is a function used to cancel the magnetization of the magnetic core of current probes
caused by the ON/OFF of the power supplied to the current probes, excessive input signal, and
other factors. Be sure to degauss the current probes before making measurements.
2 Zero adjustment is a function used to correct the characteristic drift of the current probes
caused by temperature changes. Before making measurements, perform zero adjustment
after degaussing.
Deskewing
Depending on the probe that is being used, a difference in the transfer time may occur between
voltage and input signals. You can deskew the difference in the transfer time between the
signals automatically or manually on the DL7400. To correctly measure power analysis
parameters, execute deskew between the signals after connecting the probes and the deskew
correction signal source. It is recommended that YOKOGAWA products listed below be used to
execute deskew and measure the power analysis parameters on the DL7400.
Deskew correction signal source
Model 701935
Passive probe
Model 700988
Differential probe
Model 700924 or 701921
Current probe
Model 700937
