TB 9-6625-781-24
(3) Adjust COARSE FREQ ADJ (rear panel) until frequency difference meter
indicates minimum frequency difference.
(4) Remove plug-in unit from TI plug-in compartment and adjust MED FREQ ADJ
and FINE FREQ ADJ until frequency difference meter indicates 0 frequency difference.
NOTE
Model 5245M has no MED FREQ ADJ adjustment.
(5) Replace plug-in unit.
(6) Allow 24 hours for TI oscillator stabilization. After 24 hours, if frequency
difference meter does not indicate between 3 parts in 109 ( 5 parts in 1010 for model
5245M) repeat (3) through (6) above.
b. Adjustments. No further adjustments can be made.
9. Self Check
a. Performance Check
(1) Set SENSITIVITY switch to CHECK. Indications observed on TI will be as
listed in table 3 for respective settings of TIME BASE switch.
(2) Set FUNCTION switch to MANUAL START and TIME BASE switch to .1
second setting. TI will count continuously.
Table 3. Frequency Self Check
TIME BASE
Indications
switch settings
( 1 count)
S
1
00000010
S
10
0000010.0
0.1 ms
000010.00
1 ms
00010000
10 ms
0010000.0
0.1 s
010000.00
1s
10000.000
10 s1
0000.0000
1Vary
autotransformer output from 105 to 125V ac. Wait at least 1 minute at each autotransformer setting (105 and 125 V ac)
and then adjust autotransformer for 115 V ac.
(3) Set FUNCTION switch to PERIOD AVERAGE 1. Indications observed on TI
will be as listed in table 4 for respective settings of FUNCTION switch.
Table 4. Period Average Self Check
FUNCTION switch settings
Indications
(period average)
( 1 count)
1
00000001
10
00000010
100
00000100
1 K
00001000
10 K
00010000
100 K
00100000
b. Adjustments. No adjustments can be made.