OPERATIONAL CHECK
This section describes a sequence to confirm the basic operation of the instrument. It
should be performed after receiving the instrument. It is a useful learning exercise as
well.
Before proceeding with this procedure, finish read this instruction manual thoroughly.
Then read the “Local Control” section of the “Programming Manual for -B Instruments”
thoroughly. The “Local Control” section describes the front panel controls used in this
operational check - in particular, the MOVE, CHANGE, and ADJUST controls.
1. Connect a cable from the SYNC OUT connector to the TRIG input of an
oscilloscope. Connect a 10 kΩ (or higher) load to the OUT connector and place the
scope probe across this load. The load resistor must have a voltage rating of at
least 250V. The power dissipated in the resistor is given by
P = (V
2
/ R) × (PW / T) = (V
2
/ R) × PW × f
where “V” is the output voltage, “R” is the load resistance, “PW” is the pulse width,
and “T” is the pulse period (1/frequency), and “f” is the frequency. If a 10 kΩ resistor
is used, the worst-case power dissipation is 5 Watts. (Ohmite “OY” ceramic
composition resistors -
- are recommended for such
applications. These resistors are readily available from
and other distributors.)
2. Set the oscilloscope to trigger externally with the vertical setting at 100 Volts/div
and the horizontal setting at 1 us/div. Be sure that your oscilloscope and probe
setup can handle the maximum amplitude of 250V. A high-voltage attenuator might
be necessary to avoid damaging the probe and oscilloscope.
28
AVTECH
PULSER
MAIN OUTPUT
CONNECTOR
SYNC
OUTPUT
AC
POWER
ALL CABLES: 50 OHM COAXIAL
REAL-TIME
OSCILLOSCOPE
CHANNEL A
TRIG
INPUT
SCOPE
PROBE
TEST
LOAD,
50Ω
Summary of Contents for AVR-G1-B
Page 37: ...PCB 158R5 LOW VOLTAGE POWER SUPPLY...
Page 38: ...PCB 284C HIGH VOLTAGE DC POWER SUPPLY...
Page 40: ...PCB 104G KEYPAD DISPLAY BOARD...
Page 42: ...PERFORMANCE CHECK SHEET 42...