Agilent Technologies E8267D PSG Instrukcja Użytkownika Pobierz pdf (Strona 17)

Amplitude modulation

(Option UNT) (typical)

Depth Linear mode Exponential (log) mode (downward modulation only)

Maximum

ALC on > 90% > 20 dB

ALC off with power search

ALC on with deep AM

> 95% > 40 dB

Settable 0 to 100% 0 to 40 dB

Sensitivity 0 to 100%/V 0 to 40 dB/V

Resolution 0.1% 0.01 dB

Accuracy (1 kHz rate) < ± (6% of setting + 1%) < ± (2% of setting + 0.2 dB)

External input (selectable polarity)

Sensitivity for indicated depth 1 V

peak

–1 V or +1 V

Maximum allowable ±1 V ±3.5 V

Rates (3 dB bandwidth, 30% depth)

DC coupled 0 to 100 kHz

AC coupled 10 Hz to 100 kHz (useable to 1 MHz)

Distortion (1 kHz rate, linear mode, total harmonic distortion (THD))

30% AM < 1.5%

60% AM < 2%

Paths AM1 and AM2 are summed internally for composite modulation. Either path may be switched to any

one of the modulation sources: ext1, ext2, internal1, internal2

External modulation inputs (Ext1 & Ext2) (Option UNT)

Modulation types AM, FM, and ΦM

Input impedance 50 or 600 Ω (nom), switched

High/low indicator 100 Hz to 10 MHz BW, activated when input level error exceeds 3% (nom), ac coupled inputs only

Internal modulation source (Option UNT)

Dual function generators Provide two independent signals (internal1 and internal2) for use with AM, FM, φM, or LF out

Waveforms Sine, square, positive ramp, negative ramp, triangle, Gaussian noise, uniform noise, swept sine, dual

sine

Rate range

Sine 0.5 Hz to 1 MHz

Square, ramp, triangle 0.5 Hz to 100 kHz

Resolution 0.5 Hz

Accuracy Same as timebase

LF out

Output Internal1 or internal2; also provides monitoring of internal1 or internal2 when used for AM, FM, or ΦM

Amplitude 0 to 3 V

peak

(nom) into 50 Ω

Output impedance 50 Ω (nom)

Swept sine mode (frequency, phase continuous)

Operating modes Triggered or continuous sweeps

Frequency range 1 Hz to 1 MHz

Sweep rate 0.5 to 100,000 sweeps/s, equivalent to sweep times 10 μs to 2 s

Resolution 0.5 Hz (0.5 sweep/s)

1. AM speciﬁcations are typical. For carrier frequencies below 2 MHz, AM is useable but not speciﬁed. Unless otherwise stated, speciﬁcations apply with ALC on,

deep AM off, and envelope peaks within ALC operating range (–15 dBm to maximum speciﬁed power, excluding step attenuator setting).

2. ALC off is used for narrow pulse modulation and/or high AM depths, with envelope peaks below ALC operating range. Carrier power level will be accurate after a

power search is executed.

3. ALC on with deep AM provides high AM depths together with closed-loop internal leveling. This mode must be used with a repetitive AM waveform (frequency >

10 Hz) with peaks > –5 dBm (nominal, excluding step-attenuator setting).

4. Internal2 is not available when using swept sine or dual sine modes.

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