Agilent Technologies E8267D PSG Instrukcja Użytkownika Pobierz pdf (Strona 18)

1. With ALC off, specs apply after the execution of power search. Speciﬁcations apply with Atten Hold Off (default mode for instruments with attenuator), or ALC level

between –5 and +10 dBm or maximum speciﬁed power, whichever is lower. Below 50 MHz, pulse modulation is useable; however performance is not warranted.

2. Power search is a calibration routine that improves level accuracy with ALC off. The instrument microprocessor momentarily closes the ALC loop to ﬁnd the modulator

drive setting necessary to make the quiescent RF level equal to an entered value, then opens the ALC loop while maintaining that modulator drive setting. When

executing power search, RF power will be present for typically 10 to 50 ms; the step attenuator can be set to automatically switch to maximum attenuation to protect

sensitive devices. Power search can be conﬁgured to operate either automatically or manually at the carrier frequency, or over a user-deﬁnable frequency range.

Power search may not operate above the maximum speciﬁed output power.

3. With step attenuator in 0 dB position. Above 3.2 GHz, video feed-through decreases with step attenuator setting. Below 3.2 GHz, video feed-through is expressed as a

percentage of RF output level.

Wideband AM

Rate (typical 1 dB bandwidth)

ALC on 1 kHz to 80 MHz

ALC off DC to 80 MHz

External I input

Sensitivity 0.5 V = 100%

Input impedance 50 Ω (nom)

Pulse modulation

(Option UNU or UNW)

On/off ratio Option UNU Option UNW

80 dB (typical) 80 dB

Rise/fall times (Tr, Tf)

50 to 400 MHz 10 ns (typical) 15 ns (10 ns typical)

> 400 MHz 6 ns (typical) 10 ns (6 ns typical)

Minimum pulse width

ALC on 1 μs 1 μs

ALC off

50 to 400 MHz 150 ns 30 ns

> 400 MHz 150 ns 20 ns

Repetition frequency

ALC on 10 Hz to 500 kHz 10 Hz to 500 kHz

ALC off dc to 3 MHz dc to 10 MHz

Level accuracy (relative to CW)

ALC on ±0.5 dB (0.15 dB typical) ±0.5 dB (0.15 dB typical)

ALC off with power search

50 MHz to 3.2 GHz ±0.7 dB (typical) ±0.7 dB (typical)

> 3.2 GHz ±0.5 dB (typical) ±0.5 dB (typical)

Width compression (RF width relative to video out) ±5 ns (typical) ±5 ns (typical)

Video feed-through

50 to 250 MHz < 3% (typical) < 3% (typical)

> 250 to 400 MHz < 11% (typical) < 11% (typical)

> 0.4 to 3.2 GHz < 6% (typical) < 6% (typical)

> 3.2 GHz < 2 mV pk-pk (typ) < 2 mV pk-pk (typ)

Video delay (ext input to video) 50 ns (nom) 50 ns (nom)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 33 34

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