In addition to the standard two channels of frequency measurement,
an option is available for frequency measurement on all channels.
This option provides frequency measurement of voltage and current
on all channels with input elements 1 through 3 installed.
This is necessary when you want to measure
voltage and current frequency from the instrument's I/O
as well as voltage and current frequencies of multiple items
under test at the same time.
Note:
This function cannot be installed on products
with only one input element.