Kaman KDM-8206 - Manual (Page 19)

6.4 Bridge Card
The KDM-8206 Measuring Module is stocked in two basic versions, with a 500 KHz oscillator, and
with a 1 MHz oscillator. Unique circuitry to accommodate different sensors, cable lengths, and target
material (as necessary), is added to the Measuring Module in the form of a plug in circuit card. This
small circuit card is called a “bridge card”. Some generalizations concerning the bridge card are:
1. Different bridge cards are required for ferrous and non-ferrous target materials for small
sensors (.5U1, .5U2, 1U1, 1S/1SM, 1SU/1SUM, and 1UEP).
2. For sensors 2S and larger, a different bridge card is generally not required if target material is
changed. Changing target materials requires only system recalibration to the new material.
3. The bridge card must be matched to the operating frequency of the Measuring Channel,
sensor type, and sensor cable length.
The bridge card may be replaced as follows. Refer to FIGURE 5.
NOTE: Electrostatic Discharge (ESD) procedures must be followed.
1. Remove the six screws securing the Eurocard cover with a small screwdriver. Remove the
cover from the control module.
2. The bridge card is installed in a socket at the lower center of the circuit board. Remove the
bridge card from the socket.
3. Insert the replacement bridge card into the socket. Make certain to align the ground pin on
the bridge card to the socket closes to the Euro connector.
4. Replace the Eurocard cover and attach with screws removed in step 1.
5. The Measuring Channel (sensor and Measuring Module) must be recalibrated prior to use to
ensure accurate measurements.
Figure 6 Bridge Card Location
Kaman Precision Products PART NO: 860516-001
www.kamansensors.com Last Revised: 6/20/2011
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