Connecting The Probe - YOKOGAWA DL7480 User Manual

1.3

Connecting the Probe

Input Terminals
Precautions to Be Taken When Connecting a Probe
IM 701450-51E
Connect the probe (or other input cables such as the BNC cable) to any of the input
terminals (4 terminals marked as CH1 to CH4 on the DL7440 and 8 terminals marked
CH1 to CH8 on the DL7480) located on the lower section of the front panel. The input
impedance is 1 MΩ±1.0% and approximately 20 pF or 50 Ω±1.0%.
• The maximum input voltage for 1-MΩ input is 400 V (DC + ACpeak) or 282
Vrms when the frequency is 1 kHz or less. Applying a voltage exceeding either
of these voltages can damage the input section. If the frequency is above 1
kHz, the input section may be damaged even when the voltage is below the
values specified above.
• The maximum input voltage for 50-Ω input is 5 Vrms or 10 Vpeak. Applying a
voltage exceeding either of these voltages can damage the input section.
DL7440
1MΩ/20pF 400Vpk CAT II 50 Ω 5Vrms, 10Vpk
2
1
CH CH CH
DL7480
2
1
CH CH CH
• When activating triggers on the I
SDA (serial data ) signal to the CH1 and CH2 input terminals, respectively.
• When connecting a probe to the instrument for the first time, perform phase correction
of the probe as described in section 3.5, "Compensating the Probe (Phase
Correction)" in the DL7440/DL7480 User's Manual (IM701450-01E) . Failure to do so
may result in unstable gain across different frequencies, thereby preventing correct
measurement. Calibration must be performed for each channel that is to be
connected.
• Note that if the object being measured is directly connected to the instrument without
using a probe, correct measurements may not be possible due to loading effects.
Note
Data analysis and data search can be performed on I
For details, see section 1.5, "Analyzing/Searching Data."
CAUTION
3 4
CH
1MΩ/20pF 400Vpk CAT II 50 Ω 5Vrms, 10Vpk
3 4 5
CH CH
2
C Bus signal, apply the SCL (serial clock) signal and
2
C Bus signals applied to CH3 and CH4.
6 7
8
CH CH CH
1-3
1