[email protected] wrote...
I'm an using the CXA-M10A-L inverter from TDK to power the
backlight of my CSTN panel. The open voltage should be 1200
Vrms. Below is the short datasheet:
http://power.tdk.com/dcac/brochure/pdf/CXA-M10A-L (CTR-0742-A) PRODUCT DRAWING.pdf
1. The frequency = ~28 kHz
2. The waveform = sine wave?
3. The source impedance = The only resistance/impedance
I see in the datasheet is for the load for their testing.
This is proper territory for a scope-probe waveform examination.
1500V Tektronix 100:1 probes are available from the factory, or
are often seen on eBay, but you can easily make a home-made probe
by ignoring the dc resistive-divider aspect, and making an ac-only
probe with a capacitive divider. For example, if a scope's 1M
input impedance is paralleled with 200pF of capacitance, the ac
"probe" will have a high-pass response down to ~800Hz. If the
input capacitance is 2pF, then the division ratio will be 100:1
Instead of struggling to achieve exactly 2.02pF, or some other
capacitance value, a twisted-wire "gimmick" can be used to make
an adjustable capacitor that can be adjusted at low voltages to
calibrate the home-made probe.
.. 100:1 ac probe with response down to 800Hz.
.. 2pF ______ _
.. --||---)______|_|--scope
.. \ 1M 25pF
.. \
.. '--- cable, 175pF = 6 feet 50-ohm coax