Ametek 7280 Instruction Manual page 117

NOISE1 (2.5V fs)
When set to NOISE1 the corresponding CH1/CH2 connector on the rear panel
will output a voltage related to the N
N %fs
1
+300
+100
0
Note: When NOISE1 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
When set to RATIO1 the corresponding CH1/CH2 connector on the rear panel
will output a voltage related to the result of the RATIO1 calculation, which is
defined as follows:-
10
RATIO1
where X1 output is the X1 channel output as a percentage of the full-scale
sensitivity and ADC 1 is the voltage applied to the ADC1 input connector on the
rear panel expressed in volts. 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 RATIO1 would be:-
10
RATIO1
RATIO1 2
The relationship between the voltage at the CH1/CH2 connector and the
RATIO1 value is defined as follows:-
RATIO1
+7.5
+2.5
0
-2.5
-7.5
LOG RATIO1
When set to LOG RATIO1 the corresponding CH1/CH2 connector on the rear
panel will output a voltage related to the LOG RATIO1 calculation, which is
defined as follows:-
Chapter 5, FRONT PANEL OPERATION
%fs front panel display as follows:-
1
CH1/2 Voltage
7.5 V
2.5 V
0.0 V
X1 output
ADC1 Input
0.1
0.5
1.000
CH1/2 Voltage
7.5 V
2.5 V
0.0 V
-2.5 V
-7.5 V
5-71