INTRODUCTION AND SPECIFICATIONS
Table 1-4. Typical Signal Generator Performance (cont)
1-14
HIGH RATE PHASE MODULATION........... ACPM 20 Hz to 100 kHz
BANDWIDTH (3 dB) DCPM DC to 100 kHz
(Access by SPCL 721)
NOTE
Phase Modulation specs are valid where RF Frequency - Modulation Frequency > 150 kHz
PULSE MODULATION (RF FREQUENCIES FROM 10 TO 1056 MHz)
ON/OFF RATIO 40 dB minimum for frequencies from 100to 1056 MHz
60 dB minimum for frequencies less than 100 MHz
RISE & FALL TIMES < 15 ns
LEVEL ERROR For pulse widths > 50 ns, power in the pulse will be
within ±0.7 dB of the measured CW level.
DUTY CYCLE (ext mod) 0-100%
REP RATE (ext mod) DC-16 MHz
INTERNAL MODULATION Internal rates, approx 50% duty cycle.
EXTERNAL PULSE MODULATION The pulse input is TTL compatible and 50 ohm
terminated with an internal active pull-up. It can be
modeled as 1.2V in series with 50 ohms at the pulse
modulation input connector. The signal generator
senses input terminal voltage and turns the RF off
when the terminal voltage drops below 1 ± 0.1V. Max
allowable applied voltage, ±10V.
PULSE MODULATION (RF FREQUENCIES < 10 MHz)
RISE & FALL TIMES < 2 X period of RF Frequency.
LEVEL ERROR For pulse widths > 10 X period of RF Frequency,
power in the pulse will be within ±0.7 dB of the
measured CW level.
Other specifications are the same as for the 10 to 1056 MHz range.
NON-VOLATILE MEMORY
50 instrument states are retained for typically 2 years, even with the power mains disconnected.
REVERSE POWER PROTECTION
PROTECTION LEVEL Up to 50 watts from a 50 ohm source, up to 50V DC.
Signal generator output is AC coupled. Protection is
provided when the signal generator is off.
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