Keysight Technologies L4490A, Руководство пользователя

Страница: 145 / 160

Keysight L4490A/L4491A User’s Guide 145
Additional Operating Information
Overcurrent Conditions
During operation, exceeding the L4490A/L4491A internal switch drive power
supply current specification of 600 mA can cause overcurrent conditions within
the instrument’s power supply, thus shutting down the supply and generating
errors such as:
+943,"Remote module topology change; Slot 1: Slot must be reset"
+308,"Channel not able to perform requested operation; Chan
1101: Remote module channel drive disabled"
+935,”Overcurrent detected”
In this situation, the overcurrent condition must be removed and you must cycle
power on the L4490A/L4491A to re-enable the supply.
Overcurrent conditions are often caused by the actuation (switching) current the
switch requires, and the duty cycle of the actuation pulse.
For the L4490A/L4491A, the duty cycle is set through presets of the distribution
boards, or can be set programmatically by combination of the commands:
ROUT:CHANnel:DRIVe:PULSe:Width
ROUTE:CHANnel:DRIVe:TIME:RECovery
Figure 5-7 shows the relationship between actuation pulse width and power
supply recovery time.
A single coil (unpaired) channel operating in pulsed mode with
channel verification turned off (default) will report the channel as
‘stateless’ and return an error if the command:
ROUTe:CLOSe?
is sent. Single coil channels driven by an actuation pulse must
have verification enabled with the command:
ROUTe:CHANnel:VERify ON
)
to query the channel state using the
ROUTe:CLOSe?
query.