[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

Purple

Result

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

Power On

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

# 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  ### Purple  ## Result There is no current spike at laser driver output during power on and power off ### Power On  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 

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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

Yellow(LD+) and Purple(LD-)

Result

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

Power On

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

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  ### Yellow(LD+) and Purple(LD-)  ## Result There is no current spike at laser driver output during power on and power off ### Power On  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  Note: At power off, there would not be enough current driving the relay. Thus, LD+ and LD- are eventually shorted together in the relay.

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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