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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 | 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) |
they feature the following output seetings:
| Channel | Power (V) | Current seetings | Current drawn |
|---|---|---|---|
| HMP 2030 (1) | |||
| 1 | 15 | 0.6 | 188 mA |
| 2 | 15 | 0.6 | 325 mA |
| 3 | 30 | 0.1 | 1.8 mA |
| HMP 2030 (2) | |||
| 1 | 12 | 2 | 1.5 A |
| 2 | 5 | 0.15 | 136 mA |
| 3 | 5 | 0.15 | 136 mA |
* Rhode and Schwarz HMP2030 manual
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
