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Voltage controll
We have two power supply units, both controlled by a LabVIEW script via the server. We use a Low Voltage Power Supply Unit (LVPSU), the HMP 2030 by Rohde & Schwarz. The LVPSU powers the LTA with 12 V and 1-2 A and supplies the base power for the CCD. For a High Voltage Power Supply Unit (HVPSU), we use the Keithley 2470 SourceMeter. It is used to deplete the CCD of any free charge, using around 50-70 V. It has very high precision, capable of measuring currents down to femtoamperes. This precision is needed to test for defects in CCDs.
HMP 2030
Current and voltage range of the HMP2030
Voltage Range (V) | Max Current (A) | Power Management | Voltage Precision | Current Precision | Ripple (Voltage) 0 - 16 | 5 | Standard | ±(0.05% of output + 5 mV) | ±(0.1% of output + 5 mA) | < 150 µVrms (typ. 1.5 mVrms) 16 - 32 | 2.5 | Intelligent Power Management | ±(0.05% of output + 5 mV) | ±(0.1% of output + 2 mA) | < 150 µVrms (typ. 1.5 mVrms)
VME8004X
The VME crate provied the following outputs:
| Output | Power (V) | max Current (A) | Current usage by 1 ACM |
|---|---|---|---|
| 1 | +3.3 | 25 | 2.4 A |
| 2 | +5 | 25 | 0.18 mA |
| 3 | -12 | 10 | Generated by the ±15 V line |
| 4 | +12 | 10 | |
| User Input -V1 | -15 | Set by HMP2030 | 188 mA |
| User Input +V1 | +15 | 325 mA | |
| User Input -V2 | -30 | 2 mA | |
| User Input +V2 | N/C | ||
To generate this voltages/currents it uses a Elma VME backplane (Article Number: 32220-204-0B60) 4 slot 6 HE VME64x 4 Slots with P0, with M3/M4 power bolts board (Link). I has the following features:
- Characteristic Impedance 55 Ohm +/-10 %
- Effective DC decoupling 1GHz (acts as an EMI-Filter)
- Integrated termination
- daisychain automatically activates
- 4 slots
