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OPERATION UNDER USUAL CONDITIONS cont'd |
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 TM 9-1375-213-12-3
TO 11A20-15-1
(c) Lighting of the test set lamp or
k. Use the following procedures if a firing
a wide deflection of the galvanometers needle
lead is being employed:
indicates continuity exists and the receiver is
(4) below. If continuity exists, proceed to step
(1) Lay out firing lead from the blast-
ing caps to the receiver site. Strip an inch of
insulation from each conductor of the firing
(d) If instrument indicates there
lead at the receiver end; twist the bared conduc-
is no continuity between blasting cap binding
tors together to short circuit them.
posts, check connections and repeat test. If the
instrument still indicates NO continuity DO
(2) Strip an inch of insulation from
NOT USE THE RECEIVER. Tag the bad
each conductor of the firing lead at the blasting
receiver with a statement of the problem (e.g.,
cap end. Check firing lead continuity from blast-
NO CONTINUITY -- DO NOT USE) and turn
ing site using galvanometers or M51 test set.
it in when practical along with a malfunction
report (see para 1-2).
(3) After clearing all unnecessary per-
sonnel from the area, untwist the shorted blast-
ing cap circuit leads and connect the blasting
(e) Disconnect wires from test
instrument posts.
cap circuit leads with the firing leads in accor-
dance with standard procedures. Insulate each
(4) Remove the short length wires
splice with electrical tape. At receiver site
from the receiver's binding posts (push down
untwist firing lead conductors and check conti-
post, pull out wire, release post).
nuity of full firing circuit using galvanometers
or M51 test set. Twist firing leads together
after test.
NOTE
If the antenna wire cannot be sus-
NOTE
pended vertically lay it out on the
ground in a straight line pointing
Code switches should be set to zero
towards or away from the expected
until transmitter is to be functioned.
The operator should have the transmit-
transmitter location. The effective oper-
ter in his possession at all times during
ational range will be significantly
reduced with the receiver's antenna on
the following steps:
the ground.
1. Assure that receiver's arming switch is
in SAFE position and the battery cap is
n. Place the properly checked-out receiver
in the desired location. Secure stripped end of
securely tightened down.
10 feet of antenna wire in antenna binding post
and tape antenna wire to a tree or other nearby
m. Check out continuity between receiver's
object, Suspend the antenna as vertically as pos-
blasting cap binding posts.
sible. Do not suspend antenna b tying the
wire itself around a branch, this will reduce its
(1) Strip an inch of insulation from
effective length and therefore reduce its receiv-
both ends of two short lengths of wire.
ing ability.
(2) Secure one end of each wire into a
o. Write down the code and location of each
blasting cap binding post of the receiver ( site
down post, insert wire into opened hole, release
receiver. ALWAYS do this.
post to secure).
(3) Use a blasting galvanometers or
NOTE
M51 test set to assure continuity between the
blasting cap binding posts.
When multiple receivers are used, it is
recommended that a grid coordinate tar-
(a) Connect or hold the short
length wires from receiver to the instrument
geting sheet be used (fig. 2-1). This
example contains all necessary informa-
posts.
tion needed during the tar et turn-over
to enable the operator to effectively and
(b) Function test set M51 while
accurately denote explosives placed.
watching its lamp or function galvanometers
and observe needle.
2-4
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