Atec Agilent-N5173B - Manual (Page 13)

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Amplitude modulation (Option UNT) 1
Depth Linear mode Exponential mode
Settable depth
ALC ON with deep AM (default) or
ALC off 2
0 to 100% 0 to 50 dB
Depth resolution 0.1% (nom) 0.01 dB (nom)
AM depth accuracy
ALC on 3
[@ 1KHz rate, < 80% depth]
f < 5 MHz < 1.5% of setting +1%
(typ 0.5% of setting +1%)
± 2 dB @ 40 dB depth (typ) 4
5 MHz ≤ f ≤ 3.2 GHz < 4% of setting + 1% ± 2 dB @ 40 dB depth (typ) 4
> 3.2 to 40 GHz (typ 3% of setting +1%) ± 4 dB @ 40 dB depth (typ) 4
Total harmonic distortion (@ 1 KHz rate)
f < 5 MHz 30% depth < 0.25% (typ)
80% depth < 0.5% (typ)
5 MHz < f < 40 GHz 30% depth < 2%
80% depth < 3%
Frequency response (30% depth, 3 dB BW)
9 kHz to ≤ 3.2 GHz DC/10 Hz to 50 kHz 5
> 3.2 to 40 GHz DC/10 Hz to 100 kHz 5
AM inputs using External Inputs 1 and 2
Sensitivity +1 V peak for indicated depth (over-range can be 200% or 2.2 V peak)
Input impedance 50 Ω or 600 Ω or 1 MΩ, damage level: ± 5 V max
Paths AM Paths 1 and 2 are summed internally for composite modulation
Simultaneous and composite modulation
Simultaneous modulation All modulation types (FM, AM, φM and pulse modulation) may be simultaneously enabled except:
FM and phase modulation cannot be combined; two modulation types cannot be simultaneously
generated using the same modulation source. For example the Pulse, AM, and FM can run
concurrently and all will modulate the output RF. This is useful for simulating signal impairments,
FM chirp RADAR, or scan modulation.
Composite modulation AM, FM, and ΦM each consist of two modulation paths which are summed internally for
composite modulation. Modulation can be any combination of internal or external sources.
AM FM Phase Pulse
AM + + + +
FM + + – +
Phase + – + +
Pulse + + + –
+ = compatible, – = incompatible
1. AM specifications apply 6 dB below maximum specified power and down to –15 dBm for Option 520 or –20 dBm for Option 540 from 15 to 35 °C
with ALC on.
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. Deep AM with ALC on provides increased AM depths and improved distortion, together with closed-loop internal leveling. This mode requires a
repetitive AM waveform (frequency > 10 Hz) with peaks > –5 dBm (nom), excluding step-attenuator setting).
4. ± 2 dB @ 40 dB, and 50 dB < 31.8 GHz, and ± 4 dB @ 50 dB > 31.8 GHz (meas).
5. From 5 MHz to 50 MHz carrier roll off is < 5 dB at 50 kHz rate. From 50 MHz to 3.2 GHz rate is useable up to 100 kHz. Above 3.2 GHz rate is useable
to 1 MHz.