Current Measurement Configuration
To connect a current source to the module’s screw terminals, see page 21.
This section contains information to help you configure the instrument
for making current measurements on the HP 34901A multiplexer
module. This module has two fused channels for direct dc and ac current
measurements on the measurement ranges shown below.
10 mA 100 mA 1 A Autorange
Note: Current measurements are allowed only on channels 21 and 22
on the HP 34901A module.
AC Low Frequency Filter
The instrument uses three different ac filters which enable you to either
optimize low frequency accuracy or achieve faster ac settling times.
The instrument selects the slow, medium, or fast filter based on the
input frequency that you specify for the selected channels.
Applies to ac current and ac voltage measurements only.
Input Frequency Default Settling Delay
Minimum Settling Delay
3 Hz to 300 kHz (Slow)
20 Hz to 300 kHz (Medium)
200 Hz to 300 kHz (Fast)
7 seconds / reading
1 second / reading
0.12 seconds / reading
1.5 seconds
0.2 seconds
0.02 seconds
• The instrument selects the medium filter (20 Hz) when the function is
changed or after a Factory Reset (*RST command). An Instrument
Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON
command) does not change the setting.
Chapter 4 Features and Functions
Current Measurement Configuration
116
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