Avtech 14156, Instructions Manual

Page: 27 / 42

used to form a resistive-divider-type load. By using a 10 kΩ and a 1 kΩ resistor,
as shown above, the voltage measure by the oscilloscope will be reduced by a
factor of 11, compared to the voltage at the output connector. The 10 kΩ
resistance (R1) must have a voltage rating of at least 3000 Volts, and the 1 kΩ
resistance (R2) must have a voltage rating of at lest 300 Volts. (Multiple
resistors may be used in series to achieve the required resistance with the
required voltage rating.)
Factory tests are conducted using a single Ohmite 1 kΩ, 2 Watt ceramic
composition resistor (part number OY102K) for R2. Ten of these resistors are
connected in series to form R1. These resistors are available from Digi-Key
(
http://www.digi-key.com ) and other distributors.
e) Set the oscilloscope to trigger externally with the vertical setting at 50 V/div and
the horizontal setting at 100 ns/div.
2. Turn on the AVRH-3-B. The main menu will appear on the LCD.
3. To set the AVRH-3-B to trigger from the internal clock at a PRF of 100 Hz:
a) The arrow pointer should be pointing at the frequency menu item. If it is not,
press the MOVE button until it is.
b) Press the CHANGE button. The frequency submenu will appear. Rotate the
ADJUST knob until the frequency is set at 100 Hz.
c) The arrow pointer should be pointing at the “Internal” choice. If it is not, press
MOVE until it is.
d) Press CHANGE to return to the main menu.
4. To set the delay to 100 ns:
a) Press the MOVE button until the arrow pointer is pointing at the delay menu
item.
b) Press the CHANGE button. The delay submenu will appear. Rotate the
ADJUST knob until the delay is set at 100 ns.
c) The arrow pointer should be pointing at the “Normal” choice. If it is not, press
MOVE until it is.
d) Press CHANGE to return to the main menu.
5. To set the pulse width to 500 ns:
27