RPR-4000
Operations manual
REV 8-21 23
Using the instrument in Amplifier Mode
The RPR-4000 may be used as an amplifier by connecting an arbitrary waveform
generator to the rear panel inputs.
1. Apply the RF signal to be amplified to the “CW” input on the rear panel. The
signal must not exceed 1V P/P.
2. Apply a positive TTL gate to the “AMP GATE INPUT” which goes positive
(+5V) at the beginning of the burst and goes to zero volts at the end of the burst.
Care must be taken to avoid applying the wrong polarity gate as this will effect the
output duty cycle and may cause damage to the unit.
3. Set the frequency setting on the front console to 00.000000 Hz.
Set the trigger setting to “EXT”.
4. Enable the high voltage power supply (rocker switch, front panel)
Duty cycle must be limited to 1% by the user. Allowing higher
duty cycle may cause damage to the unit.
An “external excessive duty cycle” limiter has been added to protect it from inadvertently
operating at an excessive duty cycle with external signals applied via the rear panel
connectors. When an excessive duty cycle has been applied, a resettable thermal fuse
shuts off the 24V power supply that feeds the power MOSFET drivers. When this
happens, a red LED on the rear panel will light up.
Turn the unit power off for a period of 3 to 5 minutes to allow the thermal fuse to cool.
Reset the external signal generator such that the duty cycle is 1% or less.
When the unit power is restored the LED should be off, if not, remove power long
enough to allow additional cooling.
NOTE: If RPR-4000 frequency setting is set to 00.000000Hz and no external gate is
applied for a period of time (approximately 20 minutes) the displayed peak detector
voltage will gradually drift to a level which will result in an Over Voltage condition
and will be indicated by a beeping sound and message on the front panel display.
This condition will not harm the instrument, but the operator should be aware. If
this condition occurs, it can be terminated by entering a frequency setting with
trigger set to INT. or by cycling system power.
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