To connect the AVRQ-5-B properly, do the following:
1) With the power off, install an appropriately-configured daughterboard and DUT,
as described in the previous sections.
2) Connect the SYNC output (on the front panel) to the external trigger input of the
oscilloscope using (user-supplied) coaxial cabling.
3) Connect the (user-supplied) Tektronix P5100 probe to the rear-panel HV PULSE
connector using the (user-supplied) Tektronix 013-0291-00 probe-to-BNC
adapter, or a similar arrangement.
4) With the DUT door closed, gently insert the Tektronix P6246 differential probe to
mate with the output header on the daughterboard. The “+” side of the probe
should be down. Please note that the P6246 has a maximum differential input
voltage range of 7V. If higher values of VCC2 will be used, a different probe will
be required.
5) Power-up the AVRQ-5-B and the oscilloscope.
Caution: The HV PULSE oscilloscope probe must be rated for operation at 1.5 kV
(pulsed) or higher. Factory tests are conducted using a Tektronix P5100 probe, which has
a 2.5 kV peak rating and a 1000:1 division ratio. (Remember to adjust the compensation
of the probe to match your oscilloscope input.)
INTER-CHANNEL INTERFERENCE
The test arrangements on the preceding pages show both the high-voltage pulse and the
logic output being measured on the oscilloscope at the same time.
In practice, better results are obtained if the logic waveform is measured with the high-
voltage probe disconnected from the “HV PULSE” output. Otherwise, some of the very-
fast, very-high-voltage signal may couple to the low-voltage logic input through parasitic
capacitances in the oscilloscope and its cabling. This sort of interference is typically quite
sensitive to the exact positioning of the probe cabling.
If you observe this sort of interference, measure the signals one at a time, and use the
memory-storage feature of your oscilloscope if you wish to record them on the same
waveform photo.
42
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 ...