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SECTION III. CALIBRATION PROCESS
Trigger Level

Calibration Procedure For Digital Electronic Counter An/Usm-459B Page Navigation
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TB 9-6625-2328-24
b. Press TI POWER ON/STBY pushbutton to ON and allow 30 minutes for warm-up.
NOTE
Initialization of TI controls and indicators is accomplished by
cycling the POWER ON/STBY pushbutton from STBY to ON.
8. Time Interval
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 pulse generator out1 OUTPUT to TI CHANNEL 1 input.
(4) Press TI keys as listed in (a) through (k) below:
(a) MEASURE Time & Period until TI 1 TO 2 is displayed.
(b) CHANNEL 1 Trigger/Sensitivity until AUTO TRG: is displayed, then 
to display AUTO TRG: OFF.
(c) CHANNEL 1 Trigger/Sensitivity until LEVEL: is displayed, use , , ⇐,
 to display LEVEL: .500 V and then Enter.
(d) CHANNEL 1 Trigger/Sensitivity until COMMON 1: is displayed, use 
to display COMMON 1: ON.
(e) CHANNEL 1 50Ω/1MΩ to 50Ω (LED on).
(f) CHANNEL 1 DC/AC to DC (LED on).
(g) CHANNEL 2 Trigger/Sensitivity until AUTO TRG: is displayed, then 
to display AUTO TRG: OFF.
(h) CHANNEL 2 Trigger/Sensitivity until LEVEL: is displayed, use , , ⇐,
 to display LEVEL: .500 V and then Enter.
(i) CHANNEL 2 Trigger/Sensitivity until SLOPE: is displayed, then  to
display SLOPE: NEG.
(j) CHANNEL 2 50Ω/1MΩ to 50Ω (LED on).
(k) CHANNEL 2 DC/AC to DC (LED on).
(6)
Set pulse generator output as listed in (a) through (h) below:
(a)
Press Frequency to Period and set to 10.00s.
(b)
Press the Pulse button, then the Width button, and set to 150.0ns.
(c)
Press the more key to Ampl and set the amplitude for 1V rms output.
(d)
Delay to 0.000.
(e)
Set the Lead edge to 2.5 ns.
(f)
Set the Trail edge to 2.5 ns.
(g)
Trigger source to internal frequency.
(h)
Press Out1 button.
(7) Press TI Stop/Single key. If TI does not indicate between 0.146 and 0.154 s,
perform b below.
(8) Disconnect pulse generator from TI.
4


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