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attenuation
(dB)
= 20 LOG (V
o
/(V
i
* 10))
where V
o
is the output amplitude and V
i
is the input signal amplitude (V
o
and V
i
units (Vpp, Vp) must be the same). Thus,
attenuation
(dB)
= 20 LOG (6.3/10) = -4 dB
Again, the (main) output of the AFG is connected to ’Input 1’ of the
amplifier.
The steps of this program are:
1. Reset the E1445A AFG and E1446A amplifier.
*RST
2. Set the AFG frequency, function, and amplitude.
[SOURce:]FREQuency[1][:CW|:FIXed] <frequency>
[SOURce:]FUNCtion[:SHAPe] <shape>
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]
<amplitude>
3. Set the AFG output load and output impedance values.
OUTPut[1]:LOAD <load>
OUTPut[1]:IMPedance <impedance>
4. Set the amplifier input impedance to match the AFG output load.
INPut[1]:IMPedance <impedance>
5. Set the amplifier input attenuation.
INPut[1]:ATTenuation <attenuation>
6. Set the amplifier output impedance.
OUTPut2:IMPedance <impedance>
7. Set the amplifier output attenuation.
OUTPut2:ATTenuation <attenuation>
Setting the Input Impedance Programming the Agilent E1446A 2-15