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[TEST] Turn on / Turn off behavior #20

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opened 2022-11-16 14:01:12 +08:00 by topquark12 · 2 comments
topquark12 commented 2022-11-16 14:01:12 +08:00
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linuswck commented 2024-01-16 11:24:27 +08:00
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Laser Driver Output

Objective

To see if there is current spikes appear on the laser driver output at startup and check if abnormal behavior

Test Setup

Kirdy Hardware: Rev0_2

  • Added Rev0_3 the soft start circuit at 12V Power Input

Kirdy Adapter: Rev0_1 Type 1

  • With on board Bias-T Modulation Jumper installed
  • Bias-T Input Port is left floating

Firmware: 285fc9b5d6

  • Laser Driver Related Boot Sequence: Open the LD Terminals -> Power up the DAC -> Set 150mA output current

Power Supply: Rigol DP832

  • Floating Power Supply
  • Apply 12V to the same net of the input power jack

Stimulus Source:

  • 1R Power Resistor is soldered to LD- and LD+ on the Laser Mount of Kirdy Adapter as load
  • Firmware sets the LD output current to 150mA at startup and LD terminals are not shorted together by relay on kirdy mainboard

Point of Measurement:

Blue

image

Purple

image

Result

There is no current spike at laser driver output during power on and power off

Power On

SDS2504X Plus_PNG_2
Note: There is charges left on the capacitor at 8V Power Rail in previous bootup. Therefore, LD- voltage is initially pull down to GND. Please see boot sequence.

Power Off

SDS2504X Plus_PNG_3

# Laser Driver Output ## Objective To see if there is current spikes appear on the laser driver output at startup and check if abnormal behavior ## Test Setup Kirdy Hardware: Rev0_2 - Added Rev0_3 the soft start circuit at 12V Power Input Kirdy Adapter: Rev0_1 Type 1 - With on board Bias-T Modulation Jumper installed - Bias-T Input Port is left floating Firmware: https://git.m-labs.hk/M-Labs/kirdy-testing/commit/285fc9b5d6a258c5b8c7493823746cd1f95ebf52 - Laser Driver Related Boot Sequence: Open the LD Terminals -> Power up the DAC -> Set 150mA output current Power Supply: Rigol DP832 - Floating Power Supply - Apply 12V to the same net of the input power jack Stimulus Source: - 1R Power Resistor is soldered to LD- and LD+ on the Laser Mount of Kirdy Adapter as load - Firmware sets the LD output current to **150mA** at startup and LD terminals are not shorted together by relay on kirdy mainboard ## Point of Measurement: ### Blue ![image](/attachments/eb643095-8a20-4566-bcfc-91e954c7c45c) ### Purple ![image](/attachments/65ec01d8-ad11-4155-9c56-362829052747) ## Result There is no current spike at laser driver output during power on and power off ### Power On ![SDS2504X Plus_PNG_2](/attachments/be06d55c-ea9d-4919-80c7-3fae1685d8e7) Note: There is charges left on the capacitor at 8V Power Rail in previous bootup. Therefore, LD- voltage is initially pull down to GND. Please see boot sequence. ### Power Off ![SDS2504X Plus_PNG_3](/attachments/242bdfe0-0aa4-42dc-b4a6-9445ed41a86e)
image.png
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SDS2504X Plus_PNG_2.png
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SDS2504X Plus_PNG_3.png
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linuswck commented 2024-01-16 12:39:41 +08:00
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Laser Driver Output (Without Load)

Objective

To check open circuit voltage

Test Setup

Kirdy Hardware: Rev0_2

  • Added Rev0_3 the soft start circuit at 12V Power Input

Kirdy Adapter: Rev0_1 Type 1

  • With on board Bias-T Modulation Jumper installed
  • Bias-T Input Port is left floating

Firmware: 285fc9b5d6

  • Laser Driver Related Boot Sequence: Open the LD Terminals -> Power up the DAC -> Set 150mA output current

Power Supply: Rigol DP832

  • Floating Power Supply
  • Apply 12V to the same net of the input power jack

Stimulus Source:

  • LD+ and LD- are left unconnected
  • Firmware sets the LD output current to 150mA at startup and LD terminals are not shorted together by relay on kirdy mainboard

Point of Measurement:

Blue

image

Yellow(LD+) and Purple(LD-)

image

Result

There is no current spike at laser driver output during power on and power off

Power On

SDS2504X Plus_PNG_4
Note: There is charges left on the capacitor at 8V Power Rail in previous bootup. Therefore, LD- voltage is initially pull down to GND. Please see boot sequence.

Power Off

SDS2504X Plus_PNG_5
Note: At power off, there would not be enough current driving the relay. Thus, LD+ and LD- are eventually shorted together in the relay.

# Laser Driver Output (Without Load) ## Objective To check open circuit voltage ## Test Setup Kirdy Hardware: Rev0_2 - Added Rev0_3 the soft start circuit at 12V Power Input Kirdy Adapter: Rev0_1 Type 1 - With on board Bias-T Modulation Jumper installed - Bias-T Input Port is left floating Firmware: https://git.m-labs.hk/M-Labs/kirdy-testing/commit/285fc9b5d6a258c5b8c7493823746cd1f95ebf52 - Laser Driver Related Boot Sequence: Open the LD Terminals -> Power up the DAC -> Set 150mA output current Power Supply: Rigol DP832 - Floating Power Supply - Apply 12V to the same net of the input power jack Stimulus Source: - LD+ and LD- are left unconnected - Firmware sets the LD output current to **150mA** at startup and LD terminals are not shorted together by relay on kirdy mainboard ## Point of Measurement: ### Blue ![image](/attachments/eb643095-8a20-4566-bcfc-91e954c7c45c) ### Yellow(LD+) and Purple(LD-) ![image](/attachments/0460a55e-017a-4b5e-89f7-91eebc826b97) ## Result There is no current spike at laser driver output during power on and power off ### Power On ![SDS2504X Plus_PNG_4](/attachments/76e6eedc-6d80-4adb-ba9e-86adb35abff9) Note: There is charges left on the capacitor at 8V Power Rail in previous bootup. Therefore, LD- voltage is initially pull down to GND. Please see boot sequence. ### Power Off ![SDS2504X Plus_PNG_5](/attachments/831e3024-e61a-47e0-aebb-946a048ee3c1) Note: At power off, there would not be enough current driving the relay. Thus, LD+ and LD- are eventually shorted together in the relay.
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SDS2504X Plus_PNG_4.png
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SDS2504X Plus_PNG_5.png
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sb10q closed this issue 2024-01-23 18:00:22 +08:00
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Reference: sinara-hw/kirdy#20
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