User`s manual

3-9
IM 701610-01E
Before Making Measurements
3
3.4 Connecting a Probe
Input Terminals
A probe (or an input cable such as a BNC cable) must be connected to one of the input
terminals* (CH1 to CH4 (or CH1 and CH2 for the DL1620)) located on the lower section
of the front panel.
The input impedance is 1 MΩ ±1.0% and approximately 28 pF.
* The number of input terminals varies according to the instrument model.
WARNING
To prevent fire or electric shock, do not use this instrument for category
II, III, or IV measurements.
CAUTION
The maximum allowable input voltage is 300 VDC or 300 Vrms when
the frequency is 1 kHz or less. Never input a voltage exceeding this
level, as it could damage the input section of the instrument. If the
frequency exceeds 1 kHz, the input section may be damaged even
when the voltage is below 300 VDC.
DL1640/DL1640L
CH 1 CH 2 CH 3
CH 4
1 MΩ 28 pF 300 V
CAT
DL1620
CH 1
CH 2
1MΩ 28pF 300V
CAT
Points to Note when Connecting a Probe
• When connecting a probe to the instrument for the first time, perform phase correction
of the probe as described in the section 3.5. Failure to do so may result in unstable
gain across different frequencies, thereby preventing correct measurement.
Calibration must be performed for each channel.
• If the object to be measured is connected to the instrument directly, without using a
probe, correct measurement cannot be performed due to the load effect.