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].
For the two channel units, one can choose with Channel switch [2], if channel (A) or channel (B) is displayed.
If working with manual control, output voltage can be set via 10-turn potentiometer [7] in a range from 0 to the
set maximal voltage.
If the CONTROL switch [9] is switched over to VME 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 VME control.
The maximum output current per channel 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 reading
”
Status register 2
”
and
then
”
Start voltage change
”
via interface.
Maximum output voltage and current can be selected in 10%-steps with the rotary switches V
max
[4] and I
max
[5]
(switch dialed to 10 corresponds to 100%) independently of programmable current trip. The output voltage or
current, which exceed the limits, is signaled by the red error LED on the front panel [6].
Function of KILL switch [10]:
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
[11]. Restoring the output voltage is possible after operating the switches HV-ON
or KILL or reading
”
Status register 2
”
and then
”
Start voltage change
”
by DAC
control.
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. VME Interface
Modus:
short supervisory access
(AM = 0x2D)
short nonprivileged access
(AM = 0x29)
Control via VME interface
1
st
write:
set voltage, ramp speed, maximal output current (current trip)
2
nd
switch:
output voltage = set voltage ; output voltage = 0
3
rd
read:
set voltage; actual voltage; ramp speed; actual current; current trip
current and voltage hardware limit; status
Front panel switches are having priority over software control.
Manual control
While the unit is operated in manual control mode, VME read cycles are interpreted only. Commands are
accepted, but do not result in a change of the output voltage.
