H. Dannerbauer; 07-Dec-2006

Index TableOfContents(2)


1. Determination of Chopper Offset



2. Chopper Open Loop Measurements



3. Chopper Control Loop Parameters (CALU table) - Version: 4 June 2007


nom_sky

nom_cs

red_sky

SFTcold

SFTwarm

Remark

Working well. This is the default parameter set for the sky range. Reduced performance in the CS range.

Working well. This is the default parameter set for the CS range.

Safe parameter set for the sky range in redundant mode.

adapted from nom_sky

Use under warm conditions only! Otherwise the chopper will be damaged!

Usage

use as default for sky range, working in CS range

use as default for the CS range, not useful in the sky range

to be used in redundant mode

use for cold SFT

use for warm SFT

Date of creation

Mar 29, 2007 (MN)

Mar 29, 2007 (MN)

Mar 29, 2007 (MN)

Mar 29, 2007 (MN)

Mar 22, 2007 (MN)

Source

MPE EGSE (UK, MN, JB)

MPE EGSE (UK, MN, JB)

MPE EGSE (UK, MN, JB)

MPE EGSE (UK, MN, JB)

ZEISS

PosLimit

+/- 9.5 deg (25000 units)

+/- 9.5 deg (25000 units)

+/- 9.5 deg (25000 units)

+/- 9.5 deg (25000 units)

+/- 9.5 deg (25000 units)

OutputLimit

+/- 108 mA (27100 units)

+/- 108 mA (27100 units)

+/- 108 mA (27100 units)

+/- 108 mA (27100 units)

+/- 108 mA (27100 units)

Rate

366 units, calculated for chopper pos +/- 12000 units at 8 ms ramp

250 units, calculated for chopper pos +/- 12000 units at 12 ms ramp

419 units, calculated for chopper pos +/- 12000 units at 7 ms ramp

366 units, calculated for chopper pos +/- 12000 at 8 ms ramp

29 units, calculated for chopper pos +/- 12000 at 50 ms ramp

Notch filter

593 Hz, DA=3

600 Hz, DA=3

570 Hz, DA=3

593 Hz, DA=3

730 Hz, DA=2

Offset mech. ZP

-1195 units

-1195 units

+3050 units

0 units

0 units

Transition time at +/- 4 deg

approx. 14 ms

not measured

not measured

approx. 14 ms

slow

Transition time at +/- 9 deg

approx. 75 ms

approx. 28 ms

not measured

approx. 75 ms

slow


4. Chopper Standard Tests


CUS-Script

duration

Telemetry-file name convention

SPEC_Chopper_Standard_1_2Hz_OBS.cus

129sec

SPEC_Chop_Standard_1_date_01.tm

SPEC_Chopper_Standard_2_2Hz_OBS.cus

129sec

SPEC_Chop_Standard_2_date_01.tm

PHOT_Chopper_Standard_1_2Hz_OBS.cus

49sec

PHOT_Chop_Standard_1_date_01.tm

PHOT_Chopper_Standard_2_2Hz_OBS.cus

49sec

PHOT_Chop_Standard_2_date_01.tm


5. Verify function of Ge:Ga detectors, CREs and detector heaters PTD 0.7.3 (TBD!)



6. Chopper SFT in Open Loop mode


6.1. General description

The scripts carry out the cold and warm SFT of the FM1 chopper in open-loop mode. It is designed to apply all necessary settings as previously defined in the aforementioned superseded scripts. The new script functions as follows:

  1. setup diagnostic HK at 1 kHz
  2. synchronisation to blue spectrometer
  3. configure chopper control parameters for SFT (also needed in open loop)
  4. switch on chopper
  5. configure open loop (chopper coil setting)
  6. enable chopper controller (applies open loop)
  7. put chopper to zero position
  8. perform first movement pattern
  9. put chopper to zero position
  10. perform second movement pattern
  11. put chopper to zero position
  12. disable chopper controller
  13. unset open loop
  14. set default chopper control parameters
  15. switch off chopper
  16. stop diagnostic HK

At the end, the chopper remains disabled and switched off.

6.2. First movement pattern

Starting at zero, the chopper coil current is commanded in steps of 4 mA, alternating between positive and negative values. The maximum current is 20 mA. Using DMC_MOVE_CHOP_ABS, the resulting command pattern is as follows: 0,4,-4,8,-8,12,-12,16,-16,20,-20 This corresponds to a current command pattern in commanding units according to: 0, 984, -984, 1968, -1968, 2952, -2952, 3936, -3936, 4920, -4920 The chopper will follow accordingly. For the field-plate readout, the steps should be around 2307 readout units and the maximum value should lie around +/-11535 readout units. Each chopper position will be maintained for 15 seconds in order to allow for dampening the oscillations that occur after each movement.

6.3. Second movement pattern

Starting at -20 mA, the chopper current is commanded in steps of 4 mA up to a value of +20 mA. Using DMC_MOVE_CHOP_REL, the chopper will carry out 10 consecutive movements corresponding to increasing coil currents of 4 mA each.


7. Chopper Functional Test PTD 0.7.5



8. Chopper Synchronization PTD 0.7.6 (TBD!)


8.1. Spectroscopic Mode (TBD!)

8.2. Photometeric Mode (TBD!)


9. Internal Calibration Sources PTD 0.7.11_12 & 2.5.3


9.1. Day 16:

9.2. Day 17:

9.3. Day 18:


10. Optimum Bias Setting PTD 1.2.1_2_17


Instruction for Thomas:


11. CRE Check Out Voltage PTD 1.2.4



12. Dark Current PTD 1.2.6


* for detailed test description see PTD_1.2.6_spec (->file attachment:darkcurrent.pdf) or in CVS

Test

RI

Det.Temp

Heat-Up

Obs.Time

sec/ramp-length

K /mA

sec

sec

1.

2/512

2.1/0.542

900

420

2.

2/512

2.5/1.513

900

420

3.

2/512

2.9/2.150

900

420

4.

1/256

3.2/2.607

900

420

5.

0.25/64

3.5/3.051

900

420


13. MPIA IMT/IST Procedures (080407)


13.1. Chopper Full FOV Scan In Spectroscopy (ID 409)

13.2. Detector Dark Current on Internal Calibration Sources (ID 502)

13.3. Chopper Performance Test Spectroscopy (ID 504)

13.4. Different Bias Settings for Ge:Ga Detectors (ID 509)

13.5. Internal Calibration Sources Performance Test (ID 511)