Fluke 971 Manuel utilisateur

PN 2441047

September 2005 Rev.1, 5/06

All product names are trademarks of their respective companies.

971

Temperature Humidity Meter

Users Manual

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Introduction

WCaution

To extend sensor life, keep the sensor’s

protective shutter closed whenever the meter is

not in use.

The Fluke Model 971 (hereafter referred to as “the Meter” is

a battery powered meter that measures relative humidity and

temperature. Through a few easy to use controls, the Meter

displays three different temperature points of the air

surrounding the meter’s sensor: ambient, wet bulb, and dew

point.

Electrical and Safety Symbols

WImportant information.

See manual BLow battery when shown in

the display.

PConforms to European

Union requirements ;Conforms to Australian

standards.

)Conforms to Canadian

standards OPower ON / OFF

971

Users Manual

Display

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No. Symbol Meaning

1 BLow battery.

2 Wet bulb or dew point temperature displayed.

3 M

MAX, MIN,

AVG

Min Max Record enabled.

Maximum, minimum, or average reading

displayed.

4 °F, °C Temperature measurement units.

5 % RH Relative humidity measurement unit.

6 L

Displayed reading is from memory.

Memory location number.

7 HHOLD enabled. Display freezes present

reading.

Temperature Humidity Meter

Operation

Note

When moving from one temperature/humidity

extreme to another, allow time for the Meter to

stabilize.

After opening the sensor’s protective shutter, press Oto turn

on the Meter and start taking measurements.

Temperature readings are displayed in either the

Celcius (°C) or Fahrenheit (°F) scale. To switch between °C

and °F, remove the battery compartment door and position

the temperature scale switch to the desired scale. See

Figure 1.

Dew Point and Wet Bulb Temperature

The Meter displays ambient temperature when first turned

on. To display dew point (DP) temperature, press Wonce.

Press Wagain to switch to wet bulb (WB) temperature.

Pressing Wa third time returns the Meter to ambient

temperature. The display indicates when dew point and wet

bulb temperatures are selected.

HOLD

Pressing Icauses the meter to freeze the displayed

readings. It also causes the meter to stop taking

measurements. His displayed when HOLD is enabled.

To continue taking measurements, press Iagain.

971

Users Manual

Min Max Record

When enabled, Min Max Record stores a new measurement

when it is either higher or lower than a previously stored

maximum or minimum measurement. Press Nto start Min

Max Record. Mappears in the display to indicate Min

Max Record mode is enabled.

Note

The temperature scale switch (°C/°F), Save, Recall,

and Hold buttons, as well as the Automatic Power

Off (APO) switch are all disabled when Min Max

Record is enabled.

To view the stored Minimum, Maximum and Average

readings, press Nrepeatedly to cycle through all three

stored sets of measurements. You must select wet bulb, dew

point, or ambient before reading their respective Min Max

Avg values. The display indicates which stored set of

readings is displayed. Pressing Na fourth time displays the

present measurement.

To exit Min Max Record mode and resume normal operation,

press and hold Nfor two seconds.

Saving and Recalling Measurements

The Meter stores up to 99 readings for later recall. Each

memory location stores relative humidity as well as ambient,

dew point and wet bulb temperatures.

Temperature Humidity Meter

Operation

Pressing Ssaves the present readings to a memory

location. Land the memory location number appear in

the display to indicate the readings have been stored. Press

Wto return the display to the present reading. After all 99

memory locations are filled, each subsequent save

overwrites a memory location starting with the first.

To recall the readings from memory, press R. If the

memory location you are looking for is not already displayed,

press ▲or ▼until the desired memory location is displayed.

To return the Meter to normal operation, press Rfor two

seconds.

By default, relative humidity and ambient temperature are

displayed when a memory location is recalled. Pressing W

cycles through the Wet Bulb, Dew Point, and Ambient

temperatures stored in the memory location displayed.

To erase all 99 memory locations, simultaneously press S

and Rfor five seconds.

Automatic Power Off

To save battery life, the Automatic Power Off (APO) feature

can be used to turn the meter off after 20 minutes of no

activity. To enable or disable the APO feature, remove the

battery cover and position the APO switch to the desired

position. See Figure 1.

971

Users Manual

Maintenance

Battery Replacement

Meter power is supplied by four 1.5 V (AAA size) batteries.

When Bappears in the display, replace the batteries as

soon as possible. To replace the batteries:

1. Back out the screw at the top of the battery door and lift

the door away from the Meter.

2. Remove the four AAA batteries from the compartment.

3. Replace with four new AAA batteries, observing proper

polarity as depicted on the bottom of the battery

compartment.

4. Replace the battery door and tighten the screw to lock it

in place.

Temperature Humidity Meter

Maintenance

APO

Enable/Disable

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Figure 1. Battery Compartment

Cleaning

WCaution

To avoid damage to the case, do NOT use

abrasives or solvents for cleaning the meter.

Periodically wipe the case with Fluke Meter Cleaner or a

damp cloth and detergent.

971

Users Manual

Specifications

Temperature

Range:

Accuracy:

Resolution:

Update rate:

Sensor type:

-20 to 60 °C (-4 to 140 °F)

±0.5 °C on 0 to 45 °C

±1.0 °C on -20 to 0 °C, 45 to 60 °C

±1.0 °F on 32 to 113 °F

±2.0 °F on -4 to 32 °F, 113 to 140 °F

0.1 °C /°F

500 ms

NTC

Relative Humidity

Range:

Accuracy:

Resolution:

Response time:

Sensor hysteresis:

Sensor type:

Temperature

Coefficient:

5 to 95 % RH

±2.5 % RH (10 to 90 % RH) @23 °C

(73.4 °F)

±5.0 % RH (<10, >90 % RH) @23 °C

(73.4 °F)

0.1 % RH

60 seconds max.

±1 % RH with excursion of 90 % to 10 %

to 90 %

Electronic–capacitance polymer film

0.1 x (specified accuracy)/°C (< 23 °C or

> 23 °C)

Wet Bulb Temperature

Range:

-20 to 60 °C (-4 to 140 °F)

Dew Point Temperature

Range:

-50 to 60 °C (-58 to 140 °F)

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