Keysight 53220A Mode D'emploi page 132

4 53220A/53230A Input Signal Conditioning
Channel Characteristics
There are two, plus an optional third input channel on the 53220A/53230A
counter. Product Option 201 adds parallel (additional) rear panel access to
channels 1 and 2. Product Options 106 and 115 add a 6 GHz or 15 GHz third
channel. Option 202 places third channel Option 106 / 115 on the front panel and
Option 203 places the third channel option on the rear panel.
If parallel channel 1 and channel 2 inputs are present on the rear panel (Option
NOTE
201), all input specifications apply to the rear terminals only, and are relative to
50W input impedance. Performance of the front panel inputs in this instance is
not specified. Also, when calibrating the instrument, the rear panel input
terminals are used.
When programming the counters from an I/O interface, configuration is provided
by commands within the SCPI INPut subsystem. Within the SCPI commands,
INPut[{1|2}] in the syntax refers to input channels 1 and 2. As such, these
commands do not apply to third channel Option 106 or 115.
The counter channels with the exception of frequency ratio and selected time
interval measurements are separate and can be configured independently.
Measurements on the channels do not occur simultaneously, however. Switching
between channels retains the channel configuration, but ends the current
measurement. The newly selected channel is re-initiated and measurements
begin when the programmed trigger conditions are met.
132 Keysight 53220A/53230A User's Guide