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Time Interval
Trigger Level - Continued

Calibration Procedure For Digital Electronic Counter An/Usm-459B Page Navigation
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TB 9-6625-2328-24
b. Adjustments
(1) Disconnect pulse generator from TI.
(2) Press and release TI POWER ON/STBY pushbutton to STBY.
(3) Press and hold MATH Scale & Offset key while pressing POWER ON/STBY
pushbutton to ON until CAL SECURE is displayed.
(4) Press MATH Scale & Offset key until CODE:
0 is displayed.
(5) Press ⇐ key until CODE: 00000 is displayed.
(6) Press , , ⇐,  keys until CODE: 53131 is displayed then press Enter key
and verify CAL UNSECURE is displayed.
Function
Outputs
Unbalanced
(7) Connect  function
generator
to
TI
CHANNEL 1 input.
(8) Set function generator for a square wave, 10 MHz, 1 V p-p, into a 50 Ω feed
through.
(9) Press MATH Scale & Offset key until CAL:OFFS 1 ? is displayed.
(10)Press  key until CAL: TI QUIK ? is displayed.
(11)Press Enter key. When THEN ENTER is displayed, press Enter key.
(12) Verify CALIBRATING is displayed followed by TI CAL PASS.
(13)Press MATH Scale & Offset key until CODE:
0 is displayed.
(14)Press ⇐ key until CODE: 00000 is displayed.
(15)Press , , ⇐,  keys until CODE: 53131 is displayed then press Enter key
and verify CAL SECURE is displayed.
(16)Disconnect function generator from TI.
9. Trigger Level
a. Performance Check
(1) Press and release TI POWER ON/STBY pushbutton to STBY.
(2) Press TI POWER ON/STBY pushbutton to ON.
(3) Connect function generator Output to TI CHANNEL 1 input.
(4) Press TI keys as listed in (a) through (h) below:
(a) CHANNEL 1 Trigger/Sensitivity until AUTO TRG: is displayed, then 
to display AUTO TRG: OFF.
(b) CHANNEL 1 Trigger/Sensitivity until LEVEL: is displayed, if necessary,
use , , ⇐,  to display LEVEL: 0.000 V and then Enter.
(c) CHANNEL 1 50Ω/1MΩ to 50Ω (LED on).
(d) CHANNEL 1 DC/AC to DC (LED on).
(e) CHANNEL 2 Trigger/Sensitivity until AUTO TRG: is displayed, then 
to display AUTO TRG: OFF.
(f) CHANNEL 2 Trigger/Sensitivity until LEVEL: is displayed, if necessary,
use , , ⇐,  to display LEVEL: 0.000 V and then Enter.
5


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