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Add control of the Cryocard C04 HEMT1 and 50K1 #708

Closed agustiner closed 2 years ago

agustiner commented 2 years ago

Issue

ESCRYODET-852

Description

This adds control of the Cryocard C04 HEMT Drain. The goal here is for "HEMT" to refer to the HEMT on the C02, or HEMT1 on the C04. This implies the commands get_hemt_gate_voltage and set_hemt_gate_voltage can operate over both the first C02 or C04 HEMT automatically. This can obviously get confusing. Advice appreciated. The relevant differences between the C02 HEMT and C04 HEMT are: the C02 HEMT Drain is controlled manually, the C04 HEMT Drain is controlled via DAC, the resistor used to calculate current is different (C02: R2: 200 Ohm, C04: R44: 1 Ohm).

The following optional configurations are added.

The following functions are added.

The get_hemt_drain_voltage and set_hemt_drain voltage uses the same fit from calibrating the HEMT2.

3

Test log with C04

[ 2022-02-21 05:48:10 ]  Done with setup.

In [2]: S.hemt_Vg
Out[2]: 0.49

In [3]: S.hemt_bit_to_V
Out[3]: 1.92e-06

In [4]: S.hemt_Vd_series_resistor  
Out[4]: 200.0

In [5]: S.hemt_Id_offset  
Out[5]: 0.12891

In [6]: S.hemt_gate_min_voltage 
Out[6]: -1.0

In [7]: S.hemt_gate_max_voltage 
Out[7]: 1.0

In [8]: S.hemt_gate_dac_num  
Out[8]: 3

In [9]: S.hemt_drain_dac_num 
Out[9]: 31

In [10]: S.hemt_opamp_gain
Out[10]: 3.874

In [11]: S.hemt_drain_conversion_m 
Out[11]: -0.259491

In [12]: S.hemt_drain_conversion_b 
Out[12]: 1.74185

In [13]: S.get_cryo_card_hemt_ps_en() 
Out[13]: False

In [14]: S.set_cryo_card_hemt_ps_en(True)

In [15]: S.get_hemt_gate_voltage?? 
Signature: S.get_hemt_gate_voltage(**kwargs)
Source:
 def get_hemt_gate_voltage(self, **kwargs):
  """
  Returns the HEMT voltage in bits.
  """
  return self._hemt_bit_to_V*(self.get_hemt_bias(**kwargs))
File:/usr/local/src/pysmurf/python/pysmurf/client/command/smurf_command.py
Type:method

In [16]: S.get_hemt_gate_voltage() 
Out[16]: 0.48999935999999994

In [17]: S.get_rtm_slow_dac_volt(S.hemt_gate_dac_num)
Out[17]: 0.0

In [18]: # Measuring 0.14 V on HEMT Gate. None of these three commands agree.

In [19]: S.set_hemt_gate_voltage(0)  

In [22]: # Measuring 0 V on HEMT Gate. At least rtm_spi_max_root + hemt_v_reg controls the HEMT Gate. DAC number 3 on the schematic C04 does not.  

In [25]: S.set_hemt_gate_voltage(0.5) 

In [26]: # Measuring 0.14 on HEMT Gate. Needs calibration? 

In [27]: # Next test HEMT drain.

In [28]: S.get_hemt_drain_voltage()
Out[28]: 1.74185

In [29]: # Measuring 1.7338 on HEMT Drain.  

In [30]: S.set_hemt_drain_voltage(0)  

In [31]: # Measuring 0.0067 on HEMT Drain.  

In [32]: S.set_hemt_drain_voltage(0.5)

In [33]: # Measuring 0.4998 on HEMT Drain. Good enough for now.  

In [34]: S.get_hemt_drain_current()
Out[34]: 8.024410312499999

In [35]: S.set_hemt_drain_voltage(1.75)  

In [36]: S.get_hemt_drain_current()
Out[36]: 27.689058749999994

In [37]: # This should max out at 50 mA. Needs calibration?

In [38]: S.set_hemt_drain_voltage(0)  

In [39]: S.get_hemt_drain_current()
Out[39]: 0.2255821875

In [40]: # Conclusion: HEMT1 Gate control is weird. Drain control OK. Current has range 0.22 to 27 mA, disagrees with schematic 0 to 50 mA.

Test log with C02

NA

See Also

707

Postscript

This is based off #707's changes. Just change the branch to develop once #707 is merged. Add software limits for the HEMT drain and gate in another pull request that adds software limits to all the other 4 amplifiers.

agustiner commented 2 years ago

Moving to bigger pull request