Range Specifications; Front Panel Description; Operation - Extech Instruments 407445 Instruction Manual

2.2 Range Specifications

Range
RH 10% to 95% RH
Temperature ο
0 C to 50
ο
32 F to 122

3. FRONT PANEL DESCRIPTION

1. Humidity Display
2. Temperature Display
3. ON/OFF key
4. RECORD key
5. RECALL key
6. RS-232 output jack
7. Sensor input jack
8. Sensor head
9. LCD contrast adjustment
10. Temperature units select
11. Data Hold key
12. Sensor handle

4. OPERATION

4.1 Install the "Sensor Plug" into the "Sensor Input Socket .
4.2 Press "Power Off/On" to turn the instrument power "ON".
4.3 Select the temperature units by pressing "°C/ °F ". The display will indicate "°C" or
"°F" as selected.
4.4 The meter will now display up-to-the-minute humidity and temperature.
4.5 As humidity values of the environment change, it takes a few minutes to obtain a
stable RH reading.
NOTE: For accurate Relative Humidity measurements the meter should be allowed to
stabilize for several minutes in order to adapt to the ambient temperature of the area
where the test is taking place. Also, the probe should be held from the cable end when
making measurements.
4.6 Data Hold:
While taking measurements, pressing "Data Hold" will freeze the displayed value and the
LCD will display the "D.H" indicator. Press "Hold" again to release the data hold function.
4.7 Data Record (Max., Min., and Average RH reading):
When selected, the DATA RECORD function records and stores the max, min and
average readings. To start the DATA RECORD function:
a) Press "RECORD" once. The "REC" indicator will appear on the display.
b) Press "RECALL" once to enter the "Max" mode. The "Max" indicator along with the
maximum reading recorded since the "RECORD" key was first pressed will appear on
the LCD display.
c) Press "RECALL" once, the "Min" indicator along with the minimum reading recorded
since the "RECORD" key was first pressed will appear on the LCD display.
Resolution
0.1% RH >70% RH: +(3% rdg + 1% RH);
<70% RH: +3% RH
ο ο ο
C 0.1 C +0.8 C
ο ο ο
F 0.1 F +1.5 F
2 407445es
Accuracy
Ver. 1.04 9/99