If a non-differential probe is used, it is best to avoid measuring the low-voltage “DIFF
OUT” signal at the same time as a probe is connected to the “HV PULSE” signal. Inter-
channel interference in the probes and oscilloscope may introduce significant noise on the
low-voltage signal. Instead, measure the signals separately, and use the memory storage
function of the oscilloscope if you wish to combine the signals on a single image.
INSTALLING THE DAUGHTERBOARDS
To install a daughterboard, first turn off the instrument. (The instrument will disable the
high-voltage circuitry automatically if the DUT door is opened, but it is better practice to
turn off the instrument entirely.)
Install the desired 8-pin DIP device in the DIP socket on the loose daughterboard.
If necessary for input biasing and/or VCC1 generation, install an A23-type battery on the
daughterboard. Confirm that it is generating >6V once it is installed in the battery holder.
Open the rear-panel DUT door. Raise the lever on the left side of the ZIF socket to open
the individual pin clamps.
Using tweezers, carefully lower the daughterboard into the left-most positive (for positive
tests) or the right-most position (for negative tests).
ALWAYS ENSURE THAT THE SILKSCREENED ARROW ON THE
DAUGHTERBOARD IS POINTING IN THE SAME DIRECTION AS THE ARROW ON
THE MAINFRAME, AS SHOWN IN THE PHOTOS ON PREVIOUS PAGES.
Lower the ZIF socket lever to lock the daughterboard in place.
Close the DUT door. Ensure that the instrument has been turned off for at least 60
seconds before turning it back on, to allow the embedded controller to reset properly.
Then turn on the instrument and proceed with your tests.
When testing is finished, turn off the instrument, open the DUT door, raise the ZIF lever,
and gently use tweezers to lift the daughterboard up out of the socket.
Remove the DUT and A23-type battery.
39
Summary of Contents for AVRQ-5-B
Page 52: ...Bottom side 52 ...
Page 57: ...PCB 299B FOR ADUM241E0BRWZ 57 ...
Page 82: ...PCB 158R2 LOW VOLTAGE POWER SUPPLY ...
Page 87: ...DUT WIRING ON STANDARD DAUGHTERBOARD PCB 267C ...
Page 88: ...DUT WIRING ON CUSTOMIZED TLP2366 DAUGHTERBOARD PCB 298B ...
Page 89: ...DUT WIRING ON CUSTOMIZED ADUM241E0BRWZ DAUGHTERBOARD PCB 299B ...
Page 91: ...PERFORMANCE CHECK SHEET 91 ...