Model 446580 Version 2.0 June 2004

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Meter Description

1. Temperature-Humidity Sensor

2. LCD Display

3. ON/OFF/HOLD switch

4. Temperature units switch ( °C & °F )

5. Temperature/Humidity/Record switch

(RECORD position only on the 446580)

6. RECORD / ERASE button (Model 446580 only)

7. Wet bulb calibration adjustment (for factory use only)

8. Dry bulb calibration adjustment (for factory use only)

9. PC Interface jack (Model 446580) or

Analog output jack (Model 4465CF)

The battery compartment and the tripod mount are located

on the rear of the instrument.

Operation

Getting Started

1. Set the TEMP-%RH switch to the TEMP or %RH position.

2. Move the

3. Move the ON-OFF-HOLD switch to the ON position. If the display does not switch on

please check that the 9V battery is installed and is fresh.

4. The Humidity and Temperature sensors are contained in the tip of the meter. Mount or

hold the meter in the area to be tested. For convenience, a standard tripod mount is

located at the rear of the meter.

5. Humidity changes take time (3 to 5 minutes) to stabilize. Please allow time for the

display to settle.

6. When the low battery icon flashes on the LCD, replace the 9V battery.

Displayed Readings

The Model 4465CF displays humidity or temperature readings in the center of the LCD

depending upon the position of the TEMP-%RH switch.

The

Model

446580,

displays

both

parameters

simultaneously

with

the

primary

measurement in the center of the LCD (large digits) and the secondary measurement in

the lower right hand side of the LCD (smaller digits). The 446580 also momentarily

displays the Date on power-up (in MM:DD format) on the lower left of the LCD. The date

display becomes the clock display (24-hour clock format) after several seconds.

Battery Replacement

The Battery Compartment is located on the lower back of the instrument housing. Slide the

compartment cover off in the direction of the arrow. Replace the 9V battery and secure the

compartment cover.

Data Hold

Set the ON-OFF-HOLD switch to the HOLD position to freeze a displayed reading. The H

icon will switch on. Move the switch to the ON position to continue normal operation (the H

icon will switch off).