Keysight Technologies 3458A Guide D'utilisation page 168

4 Making Measurements
The EXTOUT Signal
You can program the multimeter to output a TTL-compatible signal on its Ext Out
connector when a specified A/D converter event occurs; when the multimeter
generates a GPIB service request; or when the EXTOUT ONCE command is
executed. This signal can be used to synchronize external equipment to the
multimeter. The EXTOUT command's first parameter specifies the event that
generates the signal and its second parameter specifies the signal's polarity: NEG
= low-going, POS = high-going. The events that can generate a signal on the Ext
Out connector are:
– Reading complete
– Burst of readings complete
– Input complete
– Aperture waveform
– Service Request
– Executing the EXTOUT ONCE command
Most of the above events apply to the multimeter's A/D converter.
shows the relationship of these events to the A/D converter activity.
The apparent time intervals shown in
NOTE
only. They are not meant to indicate the actual intervals produced by the
multimeter.
168
Figure 4-5 are for the illustration purposes
Keysight 3458A User's Guide
Figure 4-5