Fluke 2620A Setting Alarms, Alarm Limits, Operating the Instrument from the Front Panel, C Pt

Operating the Instrument from the Front Panel

THESE

F

E

E

E

D

E

3

Channel Configuration

Table 3-6. RTD Temperature

Type

Terminals

R0

(Ice Point)

ChannelG

FunctionG

(NoteG1)

(NoteG2)

(NoteG

3)

PRESS

BUTTONS:

D

D

D

D

JH

TO SELECT FROM THESE CHOICES:

0

1

.

.

20

OFF

V DC

VAC

Ω

Hz

°C or °F

J

K

E

T

N R S b

C Pt

2T

4T

100.00

Completes selection and returns to Inactive Mode

Note 1. Pt selects RTD temperature measurement (DIN/IEC 751). See Table 3-5 for J, K, E, T, N, R, S, b, and C thermocouple selections.

Note 2. 4T not available on channels 0 and 11 through 20.

Note 3. R0 default is 100.00Ω. A unique R0 value can be set for each channel.

Note

Temperature units can be displayed in degrees Celsius (ºC) or Fahrenheit (ºF). To switch this setting between ºC and ºF, start with the instrument powered off, then press and hold Bwhile pressing POWER ON. The setting can also be changed through the Computer Interface with the TEMP_CONFIG command (refer to Chapter 4.)

RTD temperature measurement uses a resistance-temperature detector (RTD). RTDs, while usually larger and more expensive than thermocouples, are frequently used where accuracy, stability, and repeatability are important. The resistance of an RTD varies directly with the sensor temperature. Passing a current through this resistance generates a proportional voltage that can be accurately translated into a temperature reading. The instrument supports the DIN/IEC 751 RTD type.

Setting Alarms

Alarm Limits

Note

If you press Afor a channel that is OFF, an error beep will result. Therefore, for a new channel, use Fto define the channel's measurement function before selecting A.

Two alarm limits (Sand T) can be defined for each analog input channel. An alarm occurs when the measured value on the channel moves above the HI value or below the LO value. With the desired channel already selected from Inactive Mode, verify or change these limits using the procedure shown in Table 3-7. If necessary, refer to "Entering and Changing Numeric Values" for a more detailed description of the number changing technique used here.

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