barfield DFQ40K - Display Module and Digital Display; Connections

56-101-01501_01502 Revision D Page | 9
B. On the Display / User Entry Module
(1) Pushbuttons 0 through 9 and “.” are self-explanatory.
(2) The ENT (ENTer) pushbutton is pressed to enter a value after it has been keyed in.
(3) The DEL (DELete) pushbutton is pressed to delete the last digit keyed in.
(4) The CLR (CleaR) pushbutton is pressed to delete the entire entry.
(5) The  (up) and  (down) pushbuttons are used to increment or decrement the value
entered.
C. Connections
(1) The “+” and “-” INPUT and the “+” and “-” 4W receptacles are banana jacks and
provide the connection points for the Monitor tests. The Input jacks are used for
resistance measurements, DC voltage measurements and for sourcing or
measuring the Indicator drive current. The 4W jacks are used in conjunction with the
Input jacks and are the sense lead input jacks for making 4-wire resistance
measurements.
(2) The ACFT HI-Z COAX, ACFT LO-Z TANK and ACFT LO-Z COMP receptacles are
BNC connectors. They are used to connect the DFQ40K to leads proceeding from
the AirCraFT (tank units) side of the aircraft interface adapter cable.
(3) The IND HI-Z COAX, IND LO-Z TANK and IND LO-Z COMP receptacles are BNC
connectors and are used to connect the DFQ40K to the leads proceeding from the
INDicating side of the aircraft interface adapter cable.
(4) The SM (Shield Monitor) receptacle is a banana jack and provides the connection
point for the Shield Monitor test for aircraft which are so equipped.
(5) The GND (GrouND) receptacle is a banana jack and provides the connection point
for the chassis ground of the test set.
(6) The panel connector labeled COM LINK is used during the calibration /
recertification process.
D. Digital Display
(1) The capacity of the backlit LCD display is 8 lines by 40 characters (refer to Figure
8).
Measure Simulation
01/05/2021
10,000
IN
pF
10000
Enter value between 10 & 10,000 pF
AUTO
MON
INS
CAP
SIM
CAL
Figure 8 DFQ40K Display
(2) Battery icon - a bar graph of the remaining battery life.
(3) Status line - shows the current function.
(4) Measurement window - displays the measurement reading using 40,000 or 4,000
counts depending on function selected.
Battery
Indicator
Instructions
Measurement
Function
Date
Mode
Units
Range
Soft Keys
Menu