TM 55-4920-401-13&P
Table 4-2. Standard Day Circuit Test Table
A mp
T e mp
S e t t i ng
(ºF)
-41
- 1
59
99
139
Temperature Display
I
% RPM Display
I
16.398
24.911
33.299
63 Hz
70 Hz
77 Hz
(rev)
(rev)
(rev)
(tpa = 15.893 ms)
(tpa = 14.286 ms)
(tpa = 12.987 ms)
flashes
560
809
1055
100.1
111.2
(out-of-range)
487
715
939
95.8
106.4
117.0
399
601
799
90.0
100.0
110.0
351
538
723
86.8
96.4
106.1
310
484
656
83.8
93.1
102.4
C A U T I ON
S u s p e n d h e a t e r p r o b e s i n a i r a w ay
from flammable material.
(2) T u r n F U N C T I O N S E L E C T s w i t c h to
H E A T E R P R O B E , p l a c e T / C I N P U T s w i t c h in
HEATER CABLE position, turn PROBE CONTROL
f u l l y c o u n t e r c l o c k w i s e , t u r n T E M P E R A T U RE
switch to HEATER PROBE TEMP SET, and turn
STD DAY switch to off.
( 3 ) A d j u s t P R O B E C O N T R O L u n t i l
temperature indicator reads 600°C.
( 4 ) T u r n T E M P E R A T U R E s w i t c h t o
O P E R A T E a n d o b s e r v e p r o b e t e m p e r a t u r e on
indicator. While probes are heating up, PROBE
P O W E R l a m p g l o w s c o n t i n u o u s l y . A s p r o b e
temperature approaches set temperature, PROBE
POWER lamp begins to flash. If probe temperature
exceeds set temperature, PROBE POWER lamp will
go out until probe temeprature falls below set
temperature. Wait until probe temperature begins
to stabilize (lamp flashes on and off regularly)
b e f o r e t a k i n g a r e a d i n g . T e m p e r a t u r e i n d i c a t or
shall read 600 ± 4°C.
W A R N I NG
D o n o t t o u c h h o t h e a t e r p r o b e s as
severe burns could result.
(5) P l a c e h a n d n e a r e a c h h e a t e r p r o b e to
determine if each probe is heating.
( 6 ) T u r n P R O B E C O N T R O L f u l l y
counterclockwise and remove power from tester
4-4
before disconnecting heater probes.
e. Spread Circuit Functional Check.
(1) Turn
TEMPERATURE
switch
to
OPERATE .
(2) T u r n F U N C T I O N S E L E C T s w i t c h t o
SPREAD.
(3) Remove dust cap from SPREAD CABLE
receptacle.
(4) Using a copper jumper wire with male
c o n t a c t s , j u m p e r S P R E A D C A B L E r e c e p t a c le
contacts listed in table 4-3 when SPREAD switch is
in corresponding positions and observe temperature
indicator for an ambient temperature reading for
each jumper position.
f. Insulation Resistance Accuracy Check.
( 1 ) C o n n e c t B H 4 8 5 i n s t r u m e n t c a b l e to
I N S T R U M E N T C A B L E r e c e p t a c l e a n d c o n n e ct
BH821 insulation adapter to instrument cable.
(2) T u r n F U N C T I O N S E L E C T s w i t c h to
INSUL.
(3) Adjust screw on INSULATION CHECK
meter until meter reads infinity.
(4) Short alligator clips on insulation adapter.
(5) T u r n I N S U L A T I O N C H E C K s w i t c h to
RX100. Meter shall read zero.
(6) Connect a 10K (+ 5%) resistor between the
alligator clips. Meter shall read 10K (+ 10%).
(7) T u r n I N S U L A T I O N C H E C K s w i t c h t o
