Checking voltage in .NET

Draw QR Code JIS X 0510 in .NET Checking voltage

Checking voltage
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1. Zero the pointer. 2. Turn off the power to the circuit being measured. 3. Set the function switch to the correct voltage to be measured ( dcC or ac).
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11/8 dia (28.58)
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47/16 (112.7)(RA) 31/8 min. (17.4) 11/4 (31.80)
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Horizontal C of strike L
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Horizontal C of strike L as horizontal C of latch L bolt
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47/8 (123.83) C L 15/8 (41.3)
9/32
Low voltage electrical leads #10 wood screw
(16.40)
33/8 (85.73)
11/2 (38)
(7.14)
8-32
srews
Vertical C of strike L mtg. screws same as vertical C of latch L mtg. screws
Figure 19.6 A wooden door jamb preparation. (Adams Rite Mfg. Co.)
1.065 (27.05)
3.094 (78.59) 1.59 (40.39)
.656 (16.66)
1.687 (42.85) 1.250 (31.75) .267 (6.78)
.750(19.05)
3.370 85.60
4.870 (123.70)
1.50 (38.10) 2.60 reverse action only (66.04) 1.641 (41.68)
DIMENSIONS
In inches and (millimeters)
Figure 19.7 Strike unit dimensions for wood door jamb installations.
(Adams Rite Mfg. Co.)
115 Vac line #4605 transformer
Electric strike Actuating switch
Coil of 7500 series strike
Figure 19.8 Typical wiring dia-
gram for an audible (ac) operation. (Adams Rite Mfg. Co.)
Nineteen
115 Vac line #4605 transformer Red leads #4603 rectifier Coil of 7500 series strike
Electric strike Actuating switch
Figure 19.9 Same circuitry as shown in Figure 19.8 but with a rectifier added for silent (dc) operation. (Adams Rite Mfg. Co.)
115 Vac line #4605 transformer #4603 rectifier (when silent operation required) Actuating switch
Coil of 7500 series Red strike light
Green Yellow light light
Solenoid plunger Bolt sensor In this, one of many possible monitoring arrangements. The green light indicates that latch bolt is in strike and solenoid plunge is blocking strike. Yellow light indicates latch both is in strike but strike is unblocked, allowing access. Red light signals that latch bolt is out of strike.
Figure 19.10 Wiring for a monitor signal operation. (Adams Rite
Mfg. Co.)
4. Plug the black test lead into the common ( ) jack; plug the red test lead into the (+) jack. 5. Set the range selector to the proper voltage scale. Caution: It is very important that the selector be positioned to the nearest scale voltage to be measured. 6. Connect the black test lead to the negative side of the circuit and the red lead to the positive side. This is applicable to dc circuit only. Turn the power on to the circuit being tested. If the pointer on the VOM moves to the
Electrical Access and Exit Control Systems
left, the polarity is wrong. Turn the switch function to dc and turn the power back on. The pointer should now swing to the right for the proper reading on the dc scale. For an ac circuit, the connections are the same except as noted in step 3. You don t have to worry about polarity in the ac circuit. 7. Turn the circuit off before disconnecting the VOM.
Checking current (dc)
1. Zero the pointer. 2. Turn off the power to the circuit being tested. 3. Connect the black test lead to the 10-amp jack and the red test lead to the +10-amp jack. 4. Set the range selector to 10 amps. 5. Open the circuit to be measured by disconnecting the wire that goes to one side of the solenoid. Connect the meter in series that is, hook the black lead to one of the disconnected wires and the red lead to the other wire. 6. Turn the power on to the circuit and observe the meter. If the pointer moves to the left, reverse the leads in the jacks. 7. Turn the power back on to the circuit and read amperage on the dc scale. 8. Turn the VOM off before disconnecting.
Checking for line drop. Measure the line drop by comparing voltage readings at
the source (the transformer s secondary or input side) with the reading at the electric strike connection.
Finding circuit shorts in a hurry. The VOM is the most reliable instrument for
detecting a circuit short. This is accomplished by setting up the VOM to measure resistance. 1. Set the range switch at position R 1. 2. Set the function switch at +dc. 3. Connect the black test lead to the common ( ) jack and the red lead to the (+) jack. 4. Zero the pointer by shorting the test leads together. 5. Connect the other ends of the test leads across the resistance to be measured in the case of a solenoid, one of the test leads to one coil terminal and the other test lead to the other terminal. 6. Watch the meter. If there is no movement of the pointer, the resistance being measured is open. If the pointer moves to the peg on the right side of the scale, the resistance being measured is shorted closed. If you get a reading in between these two extremes, it is very likely the solenoid is okay.
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