3M 900AST - Manuals - manualsarea.com

Page 2 - Setup for Use; Battery Requirement; Front Panel; Test Leads

3M ™ Advanced Systems Tester 900AST Series 2 Setup for Use Battery Requirement The battery holder holds six “AA” standard alkaline batteries and should be installed prior to using the unit. Please see the 900AST tester manual or DVD for battery installation instructions. Always initiate a self-calib...

Page 3 - Keypad

3M ™ Advanced Systems Tester 900AST Series 3 Keypad The 900AST tester keypad has twelve yellow and red “Control Keys” and nine blue “Function Keys”. Additional blue keys on the keypad are reserved for future expansion and have no designation or current function. Control Keys Use the red and yellow k...

Page 4 - Contrast and Backlighting; Note: Use of backlight decreases available battery; Function Keys

3M ™ Advanced Systems Tester 900AST Series 4 Contrast and Backlighting Note: Use of backlight decreases available battery capacity. Press the key to display the contrast screen. Use the and keys to adjust the contrast. Press the key again to turn the backlight on or off. Use the key to return to pre...

Page 5 - CAUTION; Connecting to Coaxial Wires for Testing; Note: For best operation, use the special coaxial

3M ™ Advanced Systems Tester 900AST Series 5 Use the [RFL] key to ﬁnd the distance to a resistance fault between two conductors or a conductor and ground. This key is used for editing only. Use the [TDR] key to activate the Time Domain Reﬂectometer. Use the [Auto] key to activate automatic TDR trace...

Page 6 - TDR Setup; Note: The 900AST tester maintains modified Vp

3M ™ Advanced Systems Tester 900AST Series 6 TDR Setup The TDR features a setup function that allows you to select the type of Coaxial wire to be tested. From the TDR Menu, press the Setup key to enter the TDR Setup. Press the select key and the and arrow keys to highlight coaxial cable for wire typ...

Page 7 - TDR Test Modes; Single Trace

3M ™ Advanced Systems Tester 900AST Series 7 TDR Test Modes Press the or keys to move to the desired mode. Press the key to accept the highlighted mode and start the measurement. Single Trace Use the TDR Single Trace mode to test a single coaxial wire or circuit.

Page 8 - Dual Trace

3M ™ Advanced Systems Tester 900AST Series 8 Dual Trace Dual Trace is used to compare two coaxial circuits at the same time (usually a faulted and a good circuit). Connect the TDR test leads to the (Red and Black jacks) and connect the second TDR test lead set (Blue and Yellow jacks) to the referenc...

Page 9 - Peak; Note: If any of the control values are changed, the

3M ™ Advanced Systems Tester 900AST Series 9 Use the and keys to highlight the desired stored result. Press the key to display the stored trace on the bottom of the TDR screen and the “live” trace on the top. You may move the cursor by using the and keys. The control settings for the stored trace ca...

Page 10 - Move Cursor; Note: The 900AST tester automatically compensates; TDR Save for Coaxial Wiring Comparison

3M ™ Advanced Systems Tester 900AST Series 10 Length allows you to set the distance (or span) from the left side of the screen to the right side. The left side of the screen is at the end of the BNC test lead and the right side is the farthest distance that can be displayed with the selected length ...

Page 11 - Event Recognition

3M ™ Advanced Systems Tester 900AST Series 11 Press the key. The 900AST tester will display the Save Results screen as follows:Use the blue keys to enter an alphanumeric ID. The ID may have up to twelve digits. Whether a number or letter is entered depends on how many times the key is pressed. As an...

Page 12 - Target Contact

3M ™ Advanced Systems Tester 900AST Series 12 generally cause small upward peaks due to a change in impedance. To determine if an upward event is an impedance change or a main event fault you may go to the other end of the coaxial cable and disconnect it. Next, take a jumper and short the inner cond...

Page 13 - Short Circuit; Resistance Faults on Coaxial Cable

3M ™ Advanced Systems Tester 900AST Series 13 Short Circuit A short circuit (or zero-Ohm resistance fault) will show up as the lowest dip on the screen. You cannot see events past a short circuit Branch Circuit The beginning of the branch circuit will look like a small dip and the end of the branch ...

Page 14 - Auto TDR for Coaxial Fault Detection

3M ™ Advanced Systems Tester 900AST Series 14 Connect the 900AST test leads to the coaxial conductor under test. Press the key to access the Soak test from the Resistance screen. Use the key to save the active resistance to the “Snap Shot” area. Rising resistance in the active box typically indicate...

Page 15 - Auto TDR Resistive Faults

3M ™ Advanced Systems Tester 900AST Series 15 To change the coaxial configuration go to the TDR function and press the Setup key. Use the and keys and the Blue numeric keys to enter the length of cable to analyze. Enter a length longer than the cable being tested but as close as possible to the tota...

Page 16 - Care and Maintenance

3M ™ Advanced Systems Tester 900AST Series 16 In this case the low impedance anomaly at 24 inches is detected but not classiﬁed. The Auto TDR displays ‘????’ below the trace. Restoring the Aircraft After Testing/Troubleshooting Disconnect the 900AST TDR test cable from the aircraft wiring. Also, rem...