188A/C-9970

Question 1

188A description

Answer 1

1. Western Electric
2. Blue trigger
3. Chrome carry clip
4. Chrome inner tube
5. Serial number on handle

Question 2

C-9970 description

Answer 2

1. CTC/Fluke
2. Black trigger
3. Brass carry clip
4. Brass inner tube
5. No serial #

Question 3

188A/C-9970 functions

Answer 3

1. Protects user by design, through a capacitive coulpling. ( Two conductors separated by an insulator). This capacitive coupling prevents any direct metallic contact between the user and the object under test with A/C.
2. Indicates the presence of potentially hazardous voltage.

Question 4

Voltages

Answer 4

1. A/C 50-20,000 volts
2. D/C 6-2,000 volts

Question 5

Carry Bag

Answer 5

1. Green or white cotton duck bag
2. Yellow Nylon

Question 6

Battery

Answer 6

Powered by a #522 or the EN/22 Eveready alkaline battery. This battery is unique in that it has rounded edges that prevent distortion of the inner tube. Any alkaline battery with rounded edge.

Question 7

Plastic Sleeve

Answer 7

There is a plastic sleeeve and a foam stop inside the inner metal tube that houses the battery. This sleeve/foam prevents metal to metal contact with the tube and the inner battery.

Question 8

Carbide tip

Answer 8

The tip of the 188a is made from carbide steel so it may penetrate rust and paint while the user is attempting to make contact with the metallic object. It is also carbide so it will no dull easily.

Question 9

Carbon impregnated tip

Answer 9

It is carbon because carbon is conductive and the cap needs to be conductive when using the test set in conjunction with the 45’ W1BU cord to provide a path to ground.

Question 10

Carbon Cap 3 purposes

Answer 10

1. Protects user from being injured by the sharp carbide tip.
2. Protects the carbide tip from being dull.
3. Used during induced voltage testing.

Question 11

Check contact

Answer 11

The screw used to check internal circuitry

Question 12

D/C ground post

Answer 12

A chrome post on the right side of the test set. This post is to attach a B temp bond to the test set for D/C testing.

Question 13

O-ring

Answer 13

There is a rubber O-ring between the two sections to keep out moisture

Question 14

Magnetic Locking Switch

Answer 14

Turns the unit on. Switch is magnetic, so there will be no metal to metal contact between the user and the test object. The switch is also locking allowing the user to take a reading out of sight.

Question 15

Thumb Stop

Answer 15

A raised piece of plastic at the top of where the thumb rests on the magnetic locking switch. This piece of plastic keeps your thumb from accidentally sliding into the hazardous zone.

Question 16

Gusset

Answer 16

The gusset is the mounting for the magnetic locking switch and is also where the test sticker is placed.

Question 17

Flash guard

Answer 17

3 concentric flash rings in the center of the test set that absorb and deflect flash over away from the use. Forms 36” barrier.

Question 18

Detent Mark

Answer 18

Two marks embossed on both sections to allow the user to know if the unit is over or under tightened. LED and trigger must line up.