2471F INSTRUCTION MANUAL
56-101-00220-B
CH. 2
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Page 9 of 13
CHAPTER 2: OPERATING INSTRUCTIONS
CAUTION: DO NOT APPLY HIGH VOLTAGE TESTS TO CIRCUITRY NOT DESIGNED FOR
HIGH VOLTAGE APPLICATION. MOST SOLID CIRCUITRY IS SUBJECT TO
DAMAGE FROM EVEN MOMENTARY APPLICATION OF HIGH VOLTAGE.
MAKE CERTAIN DEVICE UNDER TEST IS CLEAN. DIRT, MOISTURE, AND
MOST DEPOSITS EXHIBIT RATHER LOW LEAKAGE RESISTANCE.
1. GENERAL
(1) Consult component manufacturer's testing specifications for test voltage to be applied.
Isolate the device under test from external power or circuitry.
(2) Insert test cable plug fully into receptacle at the top of the test set.
(3) Make certain meter pointer is resting at zero. (Adjust meter pointer zero adjust screw
on meter cover bezel, if necessary).
(4) Select
FUNCTION
switch to
B1
and then to
B2
to read battery condition.
(a) A reading above BATT. OK radial on the meter dial is satisfactory.
NOTE: Always return the FUNCTION switch to the MEGOHMS position after a
battery test to avoid small amount of battery drain.
(5) Place
FUNCTION
switch on
MEGOHMS
for megohmmeter operation.
(6) With
RED
test probe free from contact with external circuits or black probe, press
probe pushbutton, and then turn
FULL SCALE ADJUST
as required to produce full
scale deflection of meter pointer.
CAUTION: THIS ADJUSTMENT MUST BE RECHECKED WHENEVER A DIFFER-
ENT VOLTAGE SELECTION IS MADE.
(7) Connect
BLACK
probe to low, common, or ground side of circuit to be tested. (If both
sides of circuit to be tested are high, either point may be contacted with black probe).
Insert accessory clip on black probe, if more convenient.
(8) Connect
RED
probe to other test point, and with pushbutton depressed, read insula-
tion resistance in megohms on meter scale.
(a) Consult component manufacturer's specifications for acceptable insulation resis-
tance.
CAUTION: WAIT FOR METER TO COME TO FULL REST BEFORE READING.
THERE MAY BE A MOMENTARY DELAY AFTER BUTTON IS
PRESSED FOR HIGH VOLTAGE CONVERTER TO COME UP TO
FULL POTENTIAL, AND CAPACITANCE IN THE CIRCUIT UNDER
TEST MAY REQUIRE CHARGING TIME.
(9) Consult the Application Notes (Next Section) for further details on specific application
of the 2471F to insulation testing.
Summary of Contents for 101-00220
Page 2: ......
