Configuring the inputs
The standard Agilent 35670A has two input connectors on the front panel.
Option AY6 has four input connectors on the front panel. Each input channel
is single-ended and has an input impedance of 1 Megohm, shunted by a
capacitance of less than 100 pF. When the analyzer is in 1-channel mode, only
one input is connected, in 2-channel mode, two inputs are connected, and in
4-channel mode, all four inputs are connected.
Here are some of the different ways to configure each input channel:
• grounded/floating input
• coupling ac/dc
• anti-alias filter on/off
• autoranging on/off
• A-weight filter on/off
• ICP power supply on/off
You can also specify transducer units from the input menu. Transducer units
are useful when making measurements with calibrated transducers such as
microphones or accelerometers.
In addition, the Agilent 35670A also has a tachometer input and an external
trigger input. Both of these connectors are on the rear panel.
Input range
The analyzer has 40 input ranges, from –51 dBVrms to +27 dBVrms in 2 dB
increments. You can set the input range manually, or you can use the
analyzer’s autoranging feature. If autoranging is on, the analyzer automatically
selects a less-sensitive range if the signal exceeds the current input range. To
make the best measurement possible, you should carefully consider the method
you use to set the input range—setting the range manually or using autorange.
Maximum Input Range (+27dBVrms) and its maximum values in equivalent units
dBVrms dBV(peak) Vrms V(peak)
+27 dBVrms +30.01 dBV(peak) +22.39 Vrms +31.66 V(peak)
Minimum Input Range (–51dBVrms) and its minimum values in equivalent units
dBVrms dBV(peak) Vrms V(peak)
–51 dBVrms –47.99 dBV(peak) +2.818 mVrms +3.986 mV(peak)
Agilent 35670A
Setting Up a Measurement Operator's Guide
Part I-8
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