3 Handling
- to be continued -
CAUTION!
CAUTION!
The device is not designed to operate as a current sink.
Never apply external voltages of opposite polarity to the selected one or with values greater than the maximum
value of the selected output mode. This can damage the module.
4 Options
4.1 VCT – voltage correction by temperature
This option allows a temperature dependent correction of the output voltage. The temperatures are measured with a
distinct sensor for each channel. The temperature sensors are connected via BNC connectors on the backplane of the
module. An user-adjustable VCT-coefficient allows to specify a linear relationship between the measured temperature and
the output voltage. As an option one sensor per module can be orded.
4.1.1 Technical data
Sensor type
EPCOS B57867S0502F140
Temperature range
-40 … 80°C
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.
SHR – Desktop High Voltage Power Supply | Last changed on: 19.01.2018 |
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