Ametek 7270 Instruction Manual page 124

Chapter 5, FRONT PANEL OPERATION
5-76
MAG2%fs
+300
+100
0
PHASE2 (+9 V = +180°)
When in this setting the corresponding DAC connector on the rear panel of the
instrument outputs a voltage related to the PHA2 or 
follows:-
PHA2 or 
deg
1
+180
+90
0
-90
-180
NOISE1 (2.5V fs)
When set to NOISE the corresponding DAC connector on the rear panel of the
instrument outputs a voltage related to the N1%fs front panel display as follows:-
N1%fs
+300
+100
0
NOTE: When NOISE is selected as an output, the noise measurement mode
(Configuration Menu) must be ON. If it is not, a warning message is displayed
which offers the option of turning it on or deselecting NOISE as an analog
output.
RATIO1 (2.5V fs)
When set to RATIO the corresponding DAC connector on the rear panel of the
instrument outputs a voltage related to the result of the RATIO calculation,
which is defined as follows:-


10 X1 output
 
RATIO1

ADC1 Input
where X1 output is the X1 channel output as a percentage of the full-scale
sensitivity and ADC 1 is the voltage (expressed in volts) applied to the ADC 1
input connector on the rear panel of the instrument. Hence, for example, if the
instrument were measuring a 100 mV signal when set to the 500 mV sensitivity
setting, the X1 channel output were maximized and a 1 V signal were applied to
the ADC1 input, then the value of RATIO would be:-

0.1

10

0.5
 
RATIO1
1.000



RATIO1 2
The relationship between the voltage at the DAC connector and the RATIO
value is defined as follows:-
DAC Voltage
7.5 V
2.5 V
0.0 V
DAC Voltage
9.0 V
4.5 V
0.0 V
-4.5 V
-9.0 V
DAC Voltage
7.5 V
2.5 V
0.0 V








front panel displays as
2