Making Preparations for Measurements
Handling Precautions for the Probe Interface Terminals and
Probe Power Terminals
If you are connecting a YOKOGAWA FET probe, current probe, differential probe, or deskew correction
signal source to one of the probe power terminals (option) on the right side panel, be sure that the total
current of the eight probe power terminals and the eight probe interface terminals does not exceed 2.0
A for ±12 V or 1.6 A for ±5 V. Otherwise, the instrument’s operation may become unstable as a result
of the activation of the excessive current protection circuit of the power supply.
• The number of current probes (701932/701933) that can be used is limited by the measured current
(the current measured by the current probes). The characteristics of measured current versus
current consumption for the active probes that can be connected to the instrument are as follows.
Measured current (A)
Measured current and current consumption of the
701932/701933 current probe(example of characteristics)
Measured current (A)
Measured current and current consumption of the
701931 current probe (example of characteristics)
Measured current (A)
Measured current and current consumption of the
701928 current probe (example of characteristics)
Measured current and current consumption of the
701929 current probe (example of characteristics)
Current consumption (mA)
-50 -40 -30 -20 -10 0 10 20 30 40 50
Positive power supply, DC input
Negative power supply, DC input
Positive power supply, AC (50 Hz) input
Negative power supply, AC (50 Hz) input
600
500
400
300
200
100
0
-100
-200
-300
-400
-500
-600
Current consumption (mA)
-500 -400 -300 -200 -100 0 100 200 300 400 500
Positive power supply, DC input
Negative power supply, DC input
Positive power supply, AC (50 Hz) input
Negative power supply, AC (50 Hz) input
600
500
400
300
200
100
0
-100
-200
-300
-400
-500
-600
Measured current (A)
Current consumption (mA)
Positive power supply, DC input
Negative power supply, DC input
Positive power supply, AC (50 Hz) input
Negative power supply, AC (50 Hz) input
-50 -40 -30 -20 -10 0 10 20 30 40 50
600
500
400
300
200
100
0
-100
-200
-300
-400
-500
-600
Current consumption (mA)
Positive power supply, DC input
Negative power supply, DC input
Positive power supply, AC (50 Hz) input
Negative power supply, AC (50 Hz) input
-50 -40 -30 -20 -10 0 10 20 30 40 50
600
500
400
300
200
100
0
-100
-200
-300
-400
-500
-600
• In calculations, take the maximum current consumption of an FET probe (700939) or differential
probe (700924, 700925, 701920, 701921, 701922, or 701926) to be 125 mA for both negative and
positive voltages. Take the maximum current consumption of a differential probe (701927) to be 50
mA for both negative and positive voltages.
2.4 Connecting Probes
2-13
IM DLM4038-03EN
1
2
3
4
5
6
App
Index
