Extech Instruments RH520A User Manual

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Display Modes
STANDARD VIEW
The Standard View is the display state of the RH520A when it is turned on. Refer to the diagram
in the display description section of this manual for a representation of the Standard View. To
reach the Standard View at any time, press the VIEW button. Note that the display automatically
reverts to the Standard View five (5) minutes after the last button press.
CURSOR
The CURSOR location is indicated by a small diamond located between the two graphs. See
diagram. There is one diamond for each horizontal pixel in the graph (64 positions). The date,
time, and measurements for the data point selected by the cursor are shown in the Time/Date
and numerical measurement display fields.
 Each press of the RIGHT ARROW button will move the cursor to the right. When the cursor
reaches the right-side limit, the graph will move to the left. Holding the button down will
speed the scrolling rate. When the cursor reaches the oldest (last) reading, it will stop.
 Each press of the LEFT ARROW button will move the cursor to the left. When the cursor
reaches the left side limit, the graph will move to the right. Holding the button down will
speed the scrolling rate. When the cursor reaches the newest (latest) reading, it will stop.
 Each press of the UP ARROW button will shift the graph to the next set of 64 values; to the
left of the ones currently displayed (the cursor will not move).
 Each press of the DOWN ARROW button will shift the graph to the next set of 64 values; to
the right of the one displayed (the cursor will not move).

Extech Instruments RH520A Specifications

Temperature and Humidity

temperature range	-28 to 60 °C
temperature accuracy	±1.0 °C
humidity range	10 to 95 %
humidity accuracy	±3.0 % RH
dew point temperature	-28 to 60 °C

Power

power supply	Three ‘AA’ batteries and AC adaptor
dc voltage	5 V
battery life	4 weeks typical

Operating Environment

operating temperature range (control module and display)	0 to 50 °C
operating temperature range (sensor)	-28 to 60 °C
operating humidity (control module and display)	90 % RH max.

Memory and Data Logging

internal memory storage	49, 152 complete reading sets
sampling interval	0.1 to 199.9 minutes
alarm output current	3.4 mA @ 5 VDC

Weight and Dimensions

weight	357 g
dimensions	127 x 196 x 23 mm