iseg SHQ 122 - Page 12

CAUTION!
CAUTION
A current limit in the upper measurement range (“mA”-position) will only take effect down to the lower threshold
of the range, i.e. down to 100 µA or 10 µA, depending on the model option. A lower current limit can only be set
with the switch in the position “µA”.
• external interrupt signal INHIBIT
The INHIBIT signal is low-active (TTL low level or connected to signal GND). If INHIBIT is active, output voltage is
switched off immediately. After change of INHIBIT to TTL high level, the behaviour of the output voltage is depending
on position of KILL switch. If KILL is disabled, in manual control mode the value set with voltage set potentiometer will
be restored with hardware ramp (500V/s), in remote control mode the voltage value set via interface will be
restored with the software ramp. If KILL is enabled, in both modes the channel will stay switched Off.
• The KILL switch specifies the response on exceeding limits or on the external protection signal at the INHIBIT input as
follows
Table 2: Overview KILL function
INFORMATION
INFORMATION
Interface Control: If “Autostart” is activated (see Command List), the voltage ramp is already started after
Status read out (command “S1” or “S2”), the Command to start the voltage change (Command “G1”) is not
necessary!
SHQ series |Last changed on: 04.07.2017| www.iseg-hv.com 12/16
position switch
KILL
voltage or current limit
exceeded
Inhibit active voltage and current limit not
exceeded any more and Inhibit
not active
ENABLE (switch
in upper
position)
Output voltage switched Off
Status = ERR
Output voltage switched Off
Status = INH
manual control:
Activation of output voltage via
switching of „KILL“ or „HV ON“
remote control:
Activation of output voltage via
read out of „Sx“ and Start of ramp
„Gx“
DISABLE
(switch in lower
position)
limitation of output current,
depending on condition
decrease of output voltage.
Quality of output voltage not
guaranteed
Status = QUA
Output voltage switched Off
Status = INH
manual control: output voltage
restored with 500V/s
remote control:
output voltage restored with
software voltage ramp