I have a question about the PXI-6528 cards.
We connect a 6528 output directly to a PXI-6528 input to test continuity through the ITA and cable (During ITA self test).
In our code we perform the following:
program the power supply that is used to power the 6528 outputs (with 10K resistor at each HVDIO output)
program output the 6528 – we write an “F” to the device – at this point we expect to see what ever voltage is at the ps to be at the output pin
program inputs using the read command we expect input to read HI for any voltage over 3.2 VDC
We have two problems:
1) In order for the inputs to register a HI input or logic 1 we need to adjust the power supply to a minimum of 10 V (NOT 3.2 VDC).
a. The output is not pulsed. It is turned on for the duration of the measurement. There is sufficient time after turning the output on before we measure at the input.
b. Any ideas why the voltage has to be set so hi?
c. From the 6528 data sheet:
SCREEN SHOT from PXI-6528 datasheet from original email will not insert here... See attached file.
2) We have another situation where we have 5 inputs connected to one output (just to verify continuity)
a. We turn on the 6528 output with the power supply set to 10 V and current limited at 100 mA
b. The voltage from the power supply set at 10V but only 1.6 V appears at each of the 5 inputs
c. NOTE when connected 1-to-1 instead of 1-to-5 the power supply voltage appears at each input and is not loaded down
d. Any ideas why the PS is loaded down?
