Michell Instruments HygroCal100, Руководство пользователя

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HygroCal100 User’s Manual
26 97500 Issue 3, January 2018
OPERATION
3.6.2 Electrical Connection
Seven push fi t connector blocks are provided on the rear panel to allow power to and
communications with the probes under test.
Each connector has 6 active pins, which can be used with 2, 3 or 4-wire probes which
have either a voltage or current output, depending on how it is wired.
Pin Function Description
1 +24 V DC supply Excitation voltage for probe
2 Ground Ground
3 RH voltage input
RH input connection for probes with a
voltage scale output
4 Temperature voltage input
Temperature input connection for probes
with a voltage scale output
5 RH current input
RH input connection for probes with a
current scale output
6 Temperature current input
Temperature input connection for probes
with a current scale output
7 N/C Not connected
8 N/C Not connected
Table 8 Electrical Connection
NOTE: The system requires an RH input to be connected in order for the
temperature channel to work. A temperature input connected alone will not
be processed.
NOTE: This table also appears on the rear panel of the instrument for quick
reference.
For each connection:
1. Remove the terminal block.
2. Strip back the wires on the probe lead to ensure at least 6mm is exposed
(if necessary).
3. Insert the wire for the ground connection into the Ground terminal way,
and screw into the block. NOTE: Do not overtighten the screw.
4. Insert the wire for the supply connection into the +24 V DC terminal way,
and screw into the block. NOTE: Do not overtighten the screw.
5. Insert the wire for the RH signal connection into either the RH voltage
input or RH current input terminal way - depending on the probe - and
screw into the block. NOTE: Do not overtighten the screw.
6. Insert the wire for the temperature signal connection (if present) into
either the Temperature Voltage Input or Temperature Current Input
terminal way - depending on the probe - and screw into the block. NOTE:
Do not overtighten the screw.
7. Locate the terminal block over the connector and push it fi rmly into place.