E
PI
S
ENSOR
2
U
SER
M
ANUAL
D
OCUMENT
305801,
R
EVISION
A
Full-Scale Ranges
The EpiSensor2 supports five digitally-selectable ranges (with nominal scale factors):
Range 5: +/-4g (5 V/g)
Range 4:+/-2g (10 V/g)
Range 3: +/-1g (20 V/g)
Range 2: +/-0.5g (40 V/g)
Range 1: +/-0.25g (80 V/g)
The scale factors for these ranges are factory-trimmed to an accuracy of +/- 0.25%. There are red LEDs
that show the current range. This range is stored in non-volatile memory. The sensor range will be
maintained upon a power-on- reset (POR) event. There are three methods for setting the range:
Button Pushing
1.
Press the button once for about 1 second (0.2 to 2 second acceptable window). This will light
the LEDs and “enable” the system
2.
Each subsequent button push changes the range by one step in a cyclical fashion. Wait about 5
seconds between subsequent pushes.
3.
After 20 seconds of inactivity, the LEDs will shut off and the system will be disabled
Digitizer Enable Lines (Q330 used for this description)
1.
The sensor monitors the Q330's Generic Enable line 3 (“AUX 2”).
2.
A pulse-length encoding scheme is used to select the range
⋅
Asserting the line for between 4.5 and 5.5 seconds places the sensor range at +/-4g
⋅
Asserting the line for between 3.5 and 4.5 seconds places the sensor range at +/-2g
⋅
Asserting the line for between 2.5 and 3.5 seconds places the sensor range at +/-1g
⋅
Asserting the line for between 1.5 and 2.5 seconds places the sensor range at +/-0.5g
⋅
Asserting the line for between 0.5 and 1.5 seconds places the sensor range at +/-0.25g
RS-232 Command Line Interface
1.
At the MAIN prompt, enter “enable12345” to allow access to command menus
2.
Type “OPERATE” to select OPERATE page
3.
At the OPERATE prompt, type command to select range:
⋅
“4g” for +/-4g
⋅
“2g” for +/-2g
⋅
“1g” for +/-1g
⋅
“0.5g” for +/-0.5g
⋅
“0.25g” for +/-0.25g
Range Signaling
The EpiSensor2 feeds a range-dependent signal into the the low resolution mass position channels of
the Q330 or Rock digitizers:
5V (50 counts) for +/-4g range
4V (40 counts) for +/-2g range
3V (30 counts) for +/-1g range
2V (20 counts) for +/-0.5g range
1V (10 counts) for +/-0.25g range
Page 9
August 2015