Ametek 7270 - Page 101

Chapter 5, FRONT PANEL OPERATION
5-53
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:-
10
0.1
10
0.5
LOG RATIO log
1.000
LOG RATIO = 0.301







The relationship between the voltage at the DAC connector and the LOG RATIO
value is defined as follows:-
LOG RATIO DAC Voltage
+2.000 2.000 V
0 0.0 V
-3.000 -3.000 V
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 DAC Voltage
+10000 10.0 V
0 0.0 V
-10000 -10.0 V
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 DAC Voltage
+10000 10.0 V
0 0.0 V
-10000 -10.0 V
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.