Backlight Display; Automatic Power Off; Manual Datalogging; Calibration - Extech Instruments RH350 User Manual

Backlight Display

in
Press the [M /AV
RST
seconds.

Automatic Power OFF

With the meter off, press and hold down the [ON/OFF
second to enter auto power off settings.
Press the [MEM] button to select non-sleep (n) or 2, 5, 10, 20, 40 and 60 minutes autosleep.
Press [T2 ] to confirm the selection.
▲
WB

Manual Datalogging

Manual datalogging allows the user to store and recall up to 99 readings with the press of a button.
1. Press the [MEM] button to manually store a single reading into memory. The display will flash 3
times and the memory location number will be displayed below the humidity reading.
2. To view stored readings, press and hold the [REC
blink next to the memory location number on the display.
3. Press the [MEM] button to manually increment through the stored readings.
4. Press [REC
HOLD
5. Press [REC
HOLD
Note: In RECALL mode, pressing the [M
the stored readings in memory and display the minimum, maximum and average values of the
stored readings.
Note: A printer port is located on the side of the meter; however it is not functional on this model.

Calibration

The following verification and calibration procedures require the 33% and 75% RH reference bottles
which are supplied with the Model RH350-CAL kit.

Accuracy Verification

Checking the 33% or 75% RH Calibration
1. Insert meter's sensor into the 33% or 75% salt reference bottle
2. Check the reading after a minimum of 10 minutes
3. Verify that the reading is within the accuracy specification

Relative Humidity Calibration (33% and 75%)

33% Calibration
1. Turn the meter Off.
2. Insert the meter sensor into the 33% salt reference bottle.
3. Allow the meter one hour to stabilize.
4. While holding down the [M
seconds to enter calibration mode.
5. "32.8%" (reading may vary depending on operating temperature) will flash on the LCD
screen. After 30 minutes, the flashing will stop to indicate that the 33% calibration is
complete.
Note: Do NOT turn off the meter
6. Proceed to the 75% Calibration below.
] and [MEM] buttons together to turn on the backlight. It will remain on for ten
] + [MEM] for more than 1 second to clear the memory.
] for more than 1 second to return to normal operation.
in
/AV
in
] + [REC
SET
] button for 2 seconds and "RECALL" will
HOLD
/AV ] button for min/max/avg readings will auto search
RST
] button, press and hold the [ON/OFF
RST
4
] buttons for more than 1
HOLD
SET
RH350-en-GB_V2.5 11/14
] button for 2