TB 9-6625-116-24
(3) Set frequency counter as listed in (a) through (e) below:
(a) FUNCTION, PER A
(b) INPUT COUPLING A, DC
(c) INPUT IMPEDANCE, 50
(d) MEASUREMENT TIME, 1 SECOND
(e) EXT REF, enabled
(4) Set TI as listed in (a) through (k) below:
(a) Major function,
(time marker)
(b) [
/ 1.0[ (select 1.0)
(c) [CHANNEL SELECT]
]
(d) [LOAD 50
(e) [SIGNAL CH 1]
(f) [EXIT]
(g) [WAVE FORM]
(h) [
] (square)
(i) Keypad Entry, 10
(j) [nS]
(k) OUTPUT, ON
(5) Frequency counter will indicate within the limits of table 6. If not, perform b
below.
(6) Repeat technique of (4) (i) and (j) above for remaining time markers in table 6.
Table 6. Time Marker Accuracy
TI
Frequency counter
Time Marker Period
Min
Measured
Max
10.000 nS
9.99999750 nS
10.00000250 nS
100.00 nS
99.9999750 nS
100.0000250 nS
1.0000 uS
0.999999750 uS
1.000000250 uS
1.0000 mS
0.999999750 mS
1.000000250 mS
10.000 mS
9.99999750 mS
10.00000250 mS
(7) Set TI OUTPUT to OFF.
(8) Set frequency counter FUNCTION, to P WIDTH A.
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