Reference Channel Menu - Ametek 7270 Instruction Manual

amplifier is necessary to achieve the best results. This control allows the user to
select whether this adjustment is carried out automatically or remains under manual
control.
OFF
In this setting the AC Gain may be manually adjusted from the Main Display.
ON
In this setting the AC Gain value is automatically selected by the instrument,
depending on the full-scale sensitivity. In the mid-range full-scale sensitivity
ranges the resulting dynamic reserve is between 20 and 26 dB.
DEMOD2 SOURCE
When the demodulators are configured for dual reference operation, this control
selects the signal source for the second set of demodulators
SIGADC
In this setting the signal input to the second set of demodulators is taken from the
main signal channel ADC. This is the normal mode of operation. In dual
reference or dual harmonic mode this means that the two signals being measured
are applied to the same input connector and share a common path through the
main ADC.
ADC1
In this setting the signal input to the second set of demodulators is taken from the
auxiliary input ADC, ADC1. The full-scale sensitivity is adjustable over the
normal range of 1 V to 2 nV, but because there is no AC Gain, the effective
maximum sensitivity is 1 mV.
DEMOD1 (Tandem demodulator mode)
In this setting the signal input to the second set of demodulators is taken from the
X-channel output of the first set of demodulators
Signal Channel Menu 1
Pressing a key adjacent to the Signal Channel Menu 1 item accesses the Signal
Channel Menu 1; pressing the Previous Menu key returns control to Main Menu 1.

5.3.05 Reference Channel Menu

When Main Menu 1 is displayed, pressing a key adjacent to the Reference Channel
item accesses the Reference Channel menu, which is shown in figure 5-8.
Chapter 5, FRONT PANEL OPERATION
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