Difference between revisions of "DRIVE50"
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== Test == | == Test == | ||
| − | * Manual or Automated test | + | * Manual or Automated test methods |
=== Manual Test Method === | === Manual Test Method === | ||
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** Should be Vcc without terminator | ** Should be Vcc without terminator | ||
| − | === Automated Test Software === | + | === Automated Test Software Method === |
* [https://github.com/land-boards/QT-Py/blob/main/CircuitPython/lbcards/PulseGen/PulseGen_DRIVE50_Test.py PulseGen_DRIVE50_Test.py] - Tests PulseGen and DRIVE50 cards | * [https://github.com/land-boards/QT-Py/blob/main/CircuitPython/lbcards/PulseGen/PulseGen_DRIVE50_Test.py PulseGen_DRIVE50_Test.py] - Tests PulseGen and DRIVE50 cards | ||
Revision as of 16:09, 30 July 2022
Contents
50 Ohm Driver Card
- "TTL" Level Line driver
- 50 or 75 Ohm output impedance
- BNC or SMA output connector
- 10K pull-up on input
- Card is non-inverting
- 1.5V-5.5V power
- Typically 3.3V or 5V
- 3-pin right angle 0.1" pitch input connector
- (4) 4-40 mounting holes
Driver
- 5x paralleled 74AC14 drivers
- 24mA per pin max current output
- Symmetric high-low drive levels
- Short-circuit proof
- 5V, 250 Ohms to ground is 20 mA (pins are rated for 24 mA
- 24mA per pin max current output
- Card input has single buffer stage
- Schmitt Trigger Input
- 3.3V, 250 Ohm resistors (/5) for 50 Ohm output
- Normal output = 10 mA per pin
Test
- Manual or Automated test methods
Manual Test Method
- Supply Vcc 3.3V to 5V and ground
- Input is pulled up to Vcc
- Measure output with BNC T
- Should be 1/2 of Vcc with 50 Ohm terminator
- Should be Vcc without terminator
Automated Test Software Method
- PulseGen_DRIVE50_Test.py - Tests PulseGen and DRIVE50 cards
- Stored as code.py on QT_Py_(RP2040_based) to auto-run
- Connect 3 pin power cable to card
- Connect BNC T to output of card
- Connect BNC female from tester to BNC T male
- Install 50 terminator to other side of BNC T
- Connect USB C cable
- Display will show
PulseGen/DRIVE50 V1.1 50 Ohm card Set/Got Low Term High = OK
- All 3 LEDs are on
Mechanicals
