The burst mode may also be used with the front-panel “Single Pulse” pushbutton as a
trigger source. (Pressing the pushbutton will actually generate a single burst, rather
than a single pulse, in this mode.) Computer commands can also trigger a burst.
To control the burst count and timing from the front-panel, use the “N” and “BUR”
menus. To control them using computer commands, use the SOURce:PULSe:COUNt
and SOURce:PULSe:SEParation commands, as described in the programming manual.
The pulse spacing is constrained by several factors:
1. The maximum PRF limitation of the instrument applies within the burst. That is,
timing between two consecutive leading edges must lie between a minimum of
1/PRF
MAX
and a maximum of 1.0 seconds, where PRF
MAX
is the maximum
pulse repetition frequency specification for the instrument.
For this instrument, the maximum PRF for the instrument is 10 kHz, so the time
between two leading edges within the burst may not be smaller than 100 us. The
total number of pulses per second (i.e., Trigger Frequency x Burst Count) must
also be less than 10 kHz.
2. The maximum duty cycle limitation of the instrument can not be exceeded inside
the burst. Within the burst, the duty cycle may be calculated using DC
BURST
=
100% x Pulse Width / (Pulse Width + Pulse Separation). The total average duty
cycle is equal to DC
AVG
= 100% x Pulse Width x Burst Count x Trigger
Frequency. Both DC
BURST
and DC
AVG
must be less than the rated maximum
duty cycle of the instrument.
For this instrument, the maximum duty cycle is 80%.
DELAY
(VARIABLE)
PULSE WIDTH
(VARIABLE)
SYNC OUT
MAIN OUTPUT
BURST PULSE
SEPARATION
BURST COUNT (N),
VARIABLE FROM 1 TO 500.
(N = 3, IN THIS EXAMPLE)
PROPAGATION DELAY (FIXED)
TRIG
(external input)
> 50 ns
TTL LEVELS
(0 and 3V-5V)
26
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...
