Extech Instruments 420 Guia do Utilizador descarregar pdf (Página 13)

MA Series V2.0 7/02

electrical noise that may produce an unstable reading. However,

if the HZ reading displays zero due to insufficient sensitivity,

activate the HZ function before measuring the signal to select

the highest Hz sensitivity.

Diode Test

1. Insert the black lead into the negative COM jack and the

red test lead into the positive jack

2. Slide the function switch to " " position.

3. Press the SELECT key twice until “ “ and “V” appear in

the display.

4. Touch the test probe tips to the diode or semiconductor

junction you wish to test. Note the meter reading.

5. Reverse the test lead polarity by reversing the red and

black leads. Note this reading.

6. The diode or junction can be evaluated as follows:

A. If one reading displays a value (typically 0.400V to

0.900V) and the other reading displays "OL", the diode is

good.

B. If both readings display "OL", the device is open.

C. If both readings are very small or 0, the device is

shorted.

Temperature Measurements (MA460+)

1. Insert the Type K thermocouple into the COM and

input

jacks observing polarity.

2. Slide the function switch to the "

F" position.

3. Use the SELECT key to toggle between

C and

4. Place the Thermocouple in the area under test.

5. Wait 30 seconds for the measurement to stabilize.

6. Read the temperature on the LCD display.

Data Hold

1. Press the Data Hold key to “freeze” the reading in the

display. The annunciator “H” will appear in the display.

2. Press the Data Hold key to exit the mode.

Note: On the MA440 and MA460+ double display models, the

Data Hold feature applies only to the upper current

display (ACA).

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White rodgers 11B18 User Manual (6 pages)

Brand: White-rodgers | Category: No info | Size: 0.10 MB |

WHITE-RODGERS

CONVERTIBLE CONTROLS CONT

EXTENDING CAPILLARY

INSTALLATION

SETTING THE CONTROL

EXTENSION DU CAPILLAIRE

RÉGLAGE DE LA COMMANDE

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