barfield DC400, User Instruction

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61-101-00802.EF2 (REV. G) CH. 2
January 7, 2015 Page 8 of 44
2. INSULATION TEST (INDIVIDUAL PROBES)
Note: This test may be performed with wet or dry tanks.
A.
Aircraft Preparation
(1) Access the interconnect fuel line receptacle (left or right) which is
located under the panel’s just outboard of the engine nacelles.
Caution: When breaking or making indicator connections, insure
applicable circuit breakers are open.
(2) Open the circuit breakers.
(3) Disconnect the a/c connector at the interconnect fuel line receptacle.
B. Test Set Preparation
(1) Set the ON/OFF switch to OFF.
(2) Rotate the TEST FUNCTION switch to IND AMP.
(3) Set the INSULATION/SYSTEM switch to INSULATION.
(4) Rotate the INS TEST POINTS switch to LO-Z/GND.
(5) Set the AUX/MAIN switch to MAIN/TOT.
C. Connecting the Test Set
(1) Set up the T/S as shown in Figure 3 or Figure 4.
(2) Connect the 1900, 1900C or 1900D Probe Selector Unit (see chapter
one, section D, Equipment Required, for the appropriate part
numbers) to the Interconnect Fuel Line Receptacle connector (if the
aircraft has UA or UB serial numbers) or to the Main Harness
disconnect and the Aux Harness disconnect (if the aircraft is UC or
UE serial numbers).
(3) Connect the adapter cable to the Probe Selector unit.
(4) Connect the T/S ACFT connector to the adapter cable.
(5) Do not connect the T/S IND connector.