Vaisala HM70 - Manual (Page 42)

User's Guide ______________________________________________________________________
40 __________________________________________________________________ M210297EN-E
Figure 7 Connectors for connection cables
Calibration and Adjustment of HMD/W 60/70,
HMD/W 20/30 and HMP130 Series Transmitters
For checking and adjusting HM60/70 series and HM20/30/130 series
transmitters you need a MI70 and a HMP70 calibrated reference probe
and a connection cable. Only relative humidity channel of these
transmitters can be checked.
1. Connect the end of the HMA6070 (connection cable for
HM60/70-series) or HMA2030 (connection cable for HM20/30-
series) cable to either of the HM70's connector port located on
the bottom of the indicator, see Figure 7 on page 40.
2. Connect the other end of the HMA6070 or HM20/30/130-cable
to the
RH TEST connector (or TEST connector) of the transmitter's
motherboard.
3. Turn on MI70 indicator.
4. This concerns ONLY calibration of HM60/70-series: If a
transmitter has voltage output, select the RH input scale setting
0... 20 mA. If a transmitter has current output, set the indicator's
default setting to correspond the transmitter's signal (0... 20
mA/4...20 mA) as follows:
−
Open the MENU: press OPEN.
Connector ports