Ametek 7270 Instruction Manual page 101

setting, the X1 channel output were maximized and a 1 V signal were applied to
the ADC1 input, then the value of LOG RATIO would be:-




LOG RATIO log
10


LOG RATIO = 0.301
The relationship between the voltage at the DAC connector and the LOG RATIO
value is defined as follows:-
LOG RATIO
+2.000
0
-3.000
Note: If RATIO < 0 then LOG RATIO = -3.000
EQUATION #1
When set to EQUATION #1 the corresponding DAC connector on the rear panel
of the instrument outputs a voltage related to Equation 1, which is defined using
the Output Equations menu (see section 5.3.08), as follows:-
EQUATION #1
+10000
0
-10000
EQUATION #2
When set to EQUATION #2 the corresponding DAC connector on the rear panel
of the instrument outputs a voltage related to Equation 2, which is defined using
the Output Equations menu (see section 5.3.08), as follows:-
EQUATION #2
+10000
0
-10000
USER DAC1, USER DAC1, USER DAC1, and USER DAC4
When set to the USER DAC setting the corresponding DAC connector on the
rear panel of the instrument outputs the voltage set by the corresponding
AUX DAC control, in the range 10.000 V.
DIG SIG MON
When set to the DIG SIG MON setting the corresponding DAC connector on the
rear panel of the instrument outputs a voltage representing the digital output of
the main signal channel ADC
DIG SIG MON 2
When set to the DIG SIG MON2 setting the corresponding DAC connector on
the rear panel of the instrument outputs a voltage representing the digital input to
the second demodulator.
Chapter 5, FRONT PANEL OPERATION

0.1

10

0.5

1.000


DAC Voltage
2.000 V
0.0 V
-3.000 V
DAC Voltage
10.0 V
0.0 V
-10.0 V
DAC Voltage
10.0 V
0.0 V
-10.0 V
5-53