D
OCUMENT
301900,
R
EVISION
D
30
E
PI
S
ENSOR
U
SER
G
UIDE
Calibration Coil Test Connector
Small, white connectors are used for access to the individual calibration
coils for X, Y and Z sensor calibration. They can be purchased from
Kinemetrics (P/N 851461) or from the manufacturer –
(Molex P/N 51021-0200).
Table 7: Calibration coil test headers
Connection
Axis
J4
X
J5
Y
J6
Z
If you wish to excite the calibration coil through these connectors, install a
1k
%
series resistor in the input line to obtain the same sensitivity in V/g as
shown on the sensor calibration data record. If you wish to use a current
source to calibrate the unit, the nominal sensitivity is 0.11 g/mA and the
resistance of the calibration coil and sensitivity setting resistor is
approximately 600
%
. Do not apply high currents ( >5 mA) for more
than 20 seconds.
Caution:
If any signal source is to be connected to J4, J5 or J6, the
corresponding headers, X1, X2, and X3, (described in the previous section)
must be removed or the sensor could be damaged.
These connectors are located on the bottom of the oscillator board.
Closing the EpiSensor Case
Caution:
Potential electrostatic discharge (ESD) hazard to equipment
.
Wear a grounded wrist strap with impedance of approximately 1 M
%
when
handling the EpiSensor circuit boards to protect components from damage.
1. Be sure that the large O-ring is firmly lodged in the O-ring groove
on the base of the unit and that the connector’s O-ring is in its
groove around the base of the connector.
Note
: If the unit has not been serviced for a year or longer, apply a light
coat of silicone grease to the O-rings.
2. Gently re-install the outer case by sliding it over the connector
while aligning the three large screw holes with the corresponding
holes in the internal spacers.
