H. Dannerbauer; 07-Dec-2006

Index


1. Determination of Chopper Offset



2. Chopper Open Loop Measurements



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


nom_sky

red_sky

SFTcold

SFTwarm

Remark

Working well. This is the default parameter set for nominal DMC.

Working well. This is the default parameter set for redundant DMC.

adapted from default parameters at reduced rate

adapted from previous notch-filter parameters

Usage

default nominal DMC

default redundant DMC

Cold open-loop (SFT) nominal and redundant

Warm open-loop (SFT) nominal and redundant

Date of creation

21 June 2007 (MN)

21 June 2007 (MN)

15 June 2007 (MN)

30 June 2007 (MN)

Source

MPE EGSE (UK, MN, JB, HD, BM)

MPE EGSE (UK, MN, JB, HD, BM)

nom_sky, red_sky (UK, MN, JB, HD, BM)

nom_sky, red_sky with notch filter (UK, MN, JB, HD, BM)

PosLimit

+/- 9.5 deg (25000 units)

+/- 9.5 deg (25000 units)

+/- 9.5 deg (25000 units)

+/- 9.5 deg (26000 units)

OutputLimit

+/- 107.5 mA (27100 units)

+/- 107.5 mA (27100 units)

+/- 107.5 mA (27100 units)

+/- 107.5 mA (27100 units)

Rate

586 units, calculated for chopper pos +/- 12000 units at 5 ms ramp

586 units, calculated for chopper pos +/- 12000 units at 5 ms ramp

29 units, calculated for chopper pos +/- 12000 units at 100 ms ramp

29 units, calculated for chopper pos +/- 12000 units at 100 ms ramp

Filter

elliptical: Fc=400 Hz, Rp=6, Rs=20

elliptical: Fc=400 Hz, Rp=6, Rs=20

elliptical: Fc=400 Hz, Rp=6, Rs=20

notch: F1=570 Hz, DA=2

Offset mech. ZP

-1195 units

+3050 units

0 units

0 units

Transition time at +/- 4 deg

approx. 20 ms

approx. 20 ms

slow

slow

Transition time at +/- 9 deg

approx. 24 ms

approx. 24 ms

slow

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 It is designed to apply all necessary settings as previously defined in the aforementioned superseded scripts.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 in Spectroscopic Mode



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 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)

Herschel: PACS/FM_ILT_Procedures/MPIAprocedures (last edited 2009-07-15 14:32:36 by localhost)