S p e z i a l e l e k t r o n i k G m b H
iseg Spezialelektronik GmbH
Email: [email protected]
Phone ++ 49 351 / 26 996 - 0
Bautzner Landstr. 23
http://www.iseg-hv.com
Fax
++ 49 351 / 26 996 - 21
D - 01454 Radeberg / Rossendorf
Germany
5
On the LCD [1] output voltage in [V] or output current in [µA] will be displayed depending on the position of the
Measuring switch [3].
If working with manual control, output voltage can be set via 10-turn potentiometer [4] in a range from 0 to the set
maximal voltage.
If the CONTROL switch [6] is switched over to RS232 control, the DAC takes over the last set output voltage of
manual control. Output voltage can be generated with a programmable ramp speed (software ramp) from 2 to 255
V/s in a range from 0 to the maximal set voltage via RS232 control.
The maximum output current can be set with a programmable current trip via the interface with the resolution of
current measurement. If the output current exceeds the programmable limit, the output voltage will be shut off
permanently by the software. Restoring the voltage is possible after
”
Read status word
”
and then
”
Start voltage
change
”
via serial interface. If
”
Auto start
”
is active,
”
Start voltage change
”
is not necessary.
Maximum output voltage and current can be selected in 10%-steps with the rotary switches V
max
and I
max
(switch
dialled to 10 corresponds to 100%) on the cover side (see appendix B) independently of programmable current
trip. The output voltage or current which exceed the limits is signalled by the red error LED on the front panel [2].
Function of KILL switch [7]:
Switch to the right position:
(ENABLE KILL)
The output voltage will be shut off permanently without ramp on exceeding
V
max
, I
max
or in the presence of an INHIBIT signal (Low=active) at the INHIBIT
input [8]. Restoring the output voltage is possible after operating the switches
HV-ON [5] or KILL [7] or
”
Read status word
”
and then
”
Start voltage change
”
by DAC control. If
”
Auto start
”
is active,
”
Start voltage change
”
is not
necessary.
Note:
When capacitance is effective at the HV-output or when the rate of change of
output voltage is high (hardware ramp) at high load, then the KILL function will
be released by the current charging the condenser. In this case use a small
rate of output change (software ramp) or select ENABLE KILL not until output
voltage is set voltage.
Switch to the left position:
(DISABLE KILL)
The output voltage will be limited to V
max
, output current to I
max
respectively;
INHIBIT shuts the output voltage off without ramp, the previous voltage setting
will be restored with hard- or software ramp on INHIBIT no longer being
present.
6. RS232 interface
The most important parameters of the high voltage supply can be set and read under computer control via the
RS232 interface.
RS232 control mode
1
st
Write function:
set voltage; ramp speed; maximal output current (current trip); auto start
2
nd
Switch function:
output voltage = set voltage, output voltage = 0
3
rd
Read function:
set voltage; actual output voltage; ramp speed; actual output current;
current trip; auto start ; hardware limits current and voltage; status
Front panel switches are having priority over software control.
Manual control mode
While the unit is operated in manual control mode, RS232 read cycles are interpreted only. Commands are
accepted, but do not result in a change of the output voltage.
