Accuracy of temperature measurement
±0.5 K (0 … 60°C)
Resolution of temperature measurement
1 mK (0 … 60°C)
Temperature update rate
15 updates/min
Table 5: Technical data VCT sensor
4.1.2 Operation
The connector of the temperature sensor must be plugged in the slot of the corresponding channel on the VCT-connector
at the rear panel of the HV-module.
A programmable VCT-coefficient for each channel defines the rate and the direction of the voltage correction. The
temperatures, measured at the sensors can be read out from the module.
At the time a HV-channel is switched on or the output voltage is set by the user, the module registers the temperature of
the corresponding sensor and the set voltage as reference values.
If the temperature at the sensor changes, the output voltage is automatically adjusted according to the formula:
V = V
ref
+ a*(T-T
ref
) (a…VCT-coefficient)
Example: A channel is set to 60V. At the time it is switched on a temperature of 25°C is measured. The VCT-coefficient is
set to +1V/K. If the temperature now increases to 26°C the output voltage will increase to 61V. (For channels with a
negative output voltage the voltage changes from –60V to –61V).
A VCT-coefficient of -1V/K would decrease the voltage to 59V.
Notes:
•
During operation the values for V
set
are adjusted. If a channel is switched off the adjusted set value will be kept, not the
original value set by the user.
•
If the VCT-coefficient if modified during operation, V
ref
and T
ref
are reset to the present values to prevent a sudden
voltage change.
•
If the temperature sensor is dis- and reconnected during operation, V
ref
and T
ref
are reset to the present values to
prevent a sudden voltage change.
•
The temperature dependent voltage correction can be deactivated by setting the VCT-coefficient to 0 or by
disconnecting the temperature sensor. If this is done during operation, the channel will keep the actual voltage set.
•
If the temperature sensor is disconnected a temperature of -273.15°C is shown for that channel.
•
The VCT data points are described in the reference manual "
CAN EDCP Programmers-Guide
"
(see appendix)
and in
the manual "
iseg Hardware Abstraction Layer
"
(see appendix)
.
4.2 Single Channel Inhibit (IU, ID, NIU, NID)
INFORMATION
INFORMATION
INHIBIT is an external signal, that switches off the high voltage for the device or a specific channel
Optionally it is possible to equip modules with an
INHIBIT
for each channel via a Sub-D connector. Channel 0 to 7
corresponds to Pin 1 to 8 at the Sub-D connector, Pin 9 is connected to GND.
KILL-enable = 1
: Voltage is switched off permanently without ramp. ChannelEventStatus flag ‘EEINH’ is set. The green LED
at the front panel turns off.
KILL-enable = 0
: ChannelStatus flag ‘isEINH’ and ChannelEventStatus flag EEINH are set. The action of the HV channel can
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