User manual

H61.0.01.6C-03 User’s Manual GMH3156 page 6 of 12
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2.3 Sea Level Correction For Absolute Pressure Sensors
The device displays the absolute pressure. This is not necessarily the same like the values given by weather
stations! The weather stations‘ values are giving the pressure at sea level. Usually the sensor is placed
above sea level and therefore, if the value at sea level(zero) is to be measured, the pressure loss resulting
from the actual level above sea level has to be considered! To correct the measuring display activate the
„Sea-Level-Function“ (SL, p.r.t. chapter 2, setting is only possible, if the abs. pressure sensor is connected to
sensor socket 1). Then enter the altitude above sea level of the sensor‘s location in meters (Alti, p.r.t. chapter
2). When activated, the display shows the SL-arrow and the device displays the pressure value at sea level.
Please note: When two absolute pressure sensors are connected, the sea level function for both is
corresponding to the setting of sensor 1
2.4 Averaging Function
The averaging function concerns the display values (LCD and interface). It is completely independent from
the averaging of the logger function, please don’t mix them up!
The averaging integrates the measuring values during a selectable period of time and then calculates the
average display value. It is independent from the selected kind of measuring (slow, fast, peak detect).
As long as not enough values are collected (selected averaging time) to calculate a average value, the upper
display shows “----“, the lower display a ‘countdown‘.
During an active low-power-logging procedure the averring is always deactivated
Function of min/max-value memory during averaging:
- If averaging is activated and slow measuring is selected (rAtE-Slo), the min-/max-value memory refers to
the average display value.
- If averaging is activated and fast measuring is selected (rAtE-FASt or P.dEt) , the min-/max-value memory
refers to the internal measured values (fast peaks can be detected).
2.5 Zero Displacement Sensor 1 ('OFS.1') and Sensor 2 ('OFS.2')
A zero displacement can be carried out for the measured value:
value displayed = value measured - offset
Standard setting: 'off' = 0.0°, i.e. no zero displacement will be carried out. Together with the scale correction
(see below) this factor is mainly used to compensate for sensor deviations. Input is in the display unit.
2.6 Scale Correction Sensor 1 ('SCL.1') and Sensor 2 ('SCL.2')
The scale of the measuring can be influenced by this setting (factor is in %):
displayed value = measured value * (1+Scal/100)
Standard setting: 'off' =0.000, i.e. value is not corrected. Together with the zero displacement (see above)
this factor is mainly used to compensate for sensor deviations.
2.7 Power Off Time
If there won’t be pressed any key and no interface communication takes place for the time of the power off
time setting (P.Off), the device will be switched off automatically to save battery power.
If P.oFF = oFF then the automatic switch off is deactivated.
2.8 Output
The output can be used as serial interface (for GRS3100, GRS3105 or USB3100 interface adapters) or as
analogue output (0-1V).
2.8.1 Interface - Base Address ('Adr.')
Up to 10 devices of the GMH3xxx- handheld-family can be connected to a serial interface at once
(depending on interface converter, e.g. GRS3105: 5 devices). To get access to each device the base
addresses of the devices have to be different. For example choose 01 for the first, 11 for the second device
and so on. See also chapter 4.