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Table 5. Channel 3 Sensitivity.
Table 6. Channel 1 Frequency Accuracy.

Calibration Procedure For Digital Electronic Counter An/Usm-459B Page Navigation
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TB 9-6625-2328-24
11. Frequency Accuracy
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 equipment as shown in figure 2.
Figure 2. Equipment Setup.
(4) Press TI keys as listed in (a) through (j) below:
(a) MEASURE Gate & ExtArm until GATE: is displayed; if necessary, press 
until GATE: TIME is displayed.
(b) MEASURE Gate & ExtArm until TIME: is displayed; use , , ⇐,  to
display TIME: 1.000 s and then Enter.
(c) CHANNEL 1 Trigger/Sensitivity until AUTO TRG: is displayed, then 
to display AUTO TRG: OFF.
(d) CHANNEL 1 Trigger/Sensitivity until LEVEL: is displayed, if necessary,
use , , ⇐,  to display LEVEL: 0.000 V and then Enter.
(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; if necessary,
use , , ⇐,  to display LEVEL: 0.000 V and then Enter.
(i) CHANNEL 2 50Ω/1MΩ to 50Ω (LED on).
(j) CHANNEL 2 DC/AC to DC (LED on).
(5) Connect time/frequency workstation OUTPUT 1 MHz to TI CHANNEL 1 input.
(6) Press TI Stop/Single key. TI will indicate between 999,999.999 and
1,000,000.001 Hz.
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