A series only – Atec Agilent-E8251A User Manual

Page 8

Amplitude modulation (f

> 2 MHz)

(typical)

Exponential (log) mode

Depth

Linear mode

(Downward modulation only)

Maximum

> 90%

> 20 dB

Settable

0 - 100 %

0 to 40 dB

Resolution

0.1%

0.01 dB

Accuracy

< ±(6 % of setting + 1 %)

< ±(2% of setting + 0.2 dB)

(1 kHz rate)

Ext sensitivity

±1 Vpeak for

–1 V for indicated depth

indicated depth

Rates (3 dB bandwidth, 30% depth)

dc/10 Hz to 100 kHz typical (useable to 1 MHz)

Distortion (1 kHz rate, linear mode, THD)

30% AM

< 1.5%

90% AM

< 4 %

Path

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)

Modulation types

AM, FM, and FM

Input impedance

50 or 600

Ω, nominal, switched

High/low indicator

(100 Hz to 10 MHz BW, ac coupled inputs only)

Activated when input level error exceeds
3%, nominal

Simultaneous modulation

All modulation types may be simultaneously
enabled except: FM with FM, and linear AM with

exponential AM. AM, FM, and FM can sum

simultaneous inputs from any two sources (Ext1,
Ext2, internal1, or internal2) Any given source
(Ext1, Ext2, internal1, or internal2) may be routed
to only one activated modulation type.

Internal modulation source

Dual function generators provides two independent
signals (internal1 and internal2) for use with
AM, FM, FM, 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

For f c < 2 MHz AM is usable but not specified.
AM specifications apply with ALC on, and envelope
peaks < maximum specified power. For instruments
without Option 1E1 attenuator, specs apply for
carrier amplitude > –2 dBm.

For AM depth settings > 90% or > 20 dB, deep AM
mode or 1 kHz ALC BW is recommended.

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

A Series only