Spellman EBM30N/TEG - Operation of the HV Unit; Control Signals; Monitor Signals

EBM30N/TEG – Installation and User Guide
Document Number: 81773-4
Issue: 2
Spellman High Voltage Electronics Limited | +44 (0)1798 877000 | hvsales@spellmanhv.co.uk | Broomers Park, Pulborough, W. Sussex, UK. RH20 2RY
TEMPLATE: 40776 ISS A | ECN I-10067 | DATE: 16/04/21
QA/ENG/SAL
© 2021 Spellman High Voltage Electronics Corporation
Page 12 of 16
4 Operation of the HV Unit
4.1 Control Signals
The EBM30N/TEG unit is controlled by analogue and digital inputs using the two signal I/O connectors
shown in Section 3.3.2
The following table details the action of each control signal.
Input Signal
Level
(Vdc or TTL)
Control
Accelerator program voltage
0 to 6V
This corresponds to 0 to 30kV Accelerator output
Bias Cancellation program
voltage
0 to 3.5V
This corresponds to 0 to 3.5kV Bias Cancellation
output
Filament program current
0 to 4V
This corresponds to 0 to 4V Filament output
P.M.T program voltage
0 to 6.5V
This corresponds to 0 to 1300V P.M.T output
Scintillator program voltage
0 to 5.5V
This corresponds to 0kV to 11kV Scintillator
output
Collector program voltage
0 to 5V
This corresponds to 0 to 500V Collector output
Accelerator, Bias and Filament
remote on/off
TTL input
Accelerator, Bias and Filament all disabled if
signal is High
P.M.T output remote on/off
TTL input
P.M.T output disabled if signal is High
Scintillator output remote on/off
TTL input
Scintillator output disabled if signal is High
Collector output remote on/off
TTL input
Collector output disabled if signal is High
Note that TTL logic controls use the following levels:
low <0.8V
high >2.4V
High = off
4.2 Monitor Signals
The EBM30N/TEG is monitored by analogue and digital outputs using the two signal I/O connectors
detailed in Section 3.2
The following table details the purpose of each monitor signal.
Output Signal
Level
(Vdc or Logic)
Control
Emission Current
Monitor
0 to 10V 3% or 0.1V,
whichever is greater
This corresponds to 0 to 200uA Emission
current. Limited to 12V maximum
Filament voltage > 6V
i.e. open circuit
Open collector logic level
LOW <0.5V at ≤1.6mA
HIGH >2.5V at ≤-180uA
High means the filament has failed