Giga-tronics 2508B, Руководство по эксплуатации

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Introduction Giga-tronics 2500B Series Microwave Signal Generators
Page 20 Operation Manual, Part Number 34737, Rev C, June 30, 2011
Table 12: 2500B Rear Panel
2500B Rear Panel
Name Description
EXT ALC In external leveling, the RF output of the 2500B is detected by either a positive or
negative crystal detector, or power meter with an analog output. The signals from
these devices are connected to the ALC circuitry of the 2500B, which is used to
compensate for standing wave effects or cable and component losses at the input of
the device under test.
MODULATION GENERATOR
FM/φΜ OUT The internal modulation generator output; 2 Vpp into 10 kΩ.
PULSE OUT A +4 V video representation of the pulsed RF output signal.
AM OUT The internal modulation generator output; 2 Vp-p into 10 kΩ.
PM SYNC OUT A synchronization output pulse of > 75 ns width, TTL levels that can be delayed
relative to the leading edge of the video signal at the PULSE OUT connector.
Limits of delay: ≥ 50 ns, ≤ 10 ms.
FM/φM IN
A 50 Ω input for an external FM or φM modulating signal. The input signal can be
any waveform compatible with bandwidth considerations. A 1-V peak input
produces maximum deviation. Maximum input is ± 1 V p-p.
An externally supplied DC signal can be applied to this input to modulate the
frequency of the CW output.
AM IN A 600 Ω input for an external AM signal. The input signal can be any waveform
compatible with bandwidth considerations. Maximum input is ± 1 V p-p.
PULSE IN
PM TRIG IN A Pulse Modulation Input for external Pulse In. The input parameters are:
TTL, polarity selectable, 50 Ω characteristic impedance, 2 kΩ pull-up.
LOCK/LEVEL +5 Volt output, active high when the 2500B is phase locked and output leveled. The
Lock and Level indicator is valid for CW and List mode.
REF TUNE A 0 to +10 Volts, high-impedance input for tuning the internal reference in order to
adjust the output frequency approxi5 ppm. Do not exceed
+15 Volts or apply a negative voltage greater than -1 Volt.
SYNC OUT In List mode, the unit can be set to generate a pulse at this output when a specified list
point is reached. The RF output can be delayed from the start of the list point up to a
maximum of 10 ms. The pulse width of the SYNC OUT signal is determined as follows:
Pulse width = Step Time - Sync Delay - 10 µs.
In Ramp operation, the pulse occurs at the start of each ramp sweep. In either case,
the output pulse is +5 Volts.
TRIGGER IN Triggers a List. Accepts a TTL level signal of > 50 ns width.