| GP-HR
6 Pin Connector : |
|
- Probes are connected to the GP-HR
Datalogger via a 6 pin Switchcraft Plug.
- Switchcraft is a company name.
- The logger has a female socket.
- The probe or probes require a 6 pin Male
InLine Plug, Switchcraft Part Number EN3C6M
- These are available from Trutrack as part
number EN3C6M
- They are also available from Farnell
as part number 727-034
|
| Identifying
the Pins : |
|
- There is a small index mark
(Dot) next to Pin 1 on both Plugs and Sockets.
- You may need a magnifying glass to see this.
- Looking at the rear (solder end) of the 6
pin Male InLine Plug
- With the Key way to the top
- Pin 1 is Top Left
- Pin 2, 3, 4, and 5 are the next pins in an
anticlockwise direction
- So Pin 3 is at the Bottom and pin 5 is at
the Top Right
- Pin 6 is in the middle
 |
View from Front of Socket or Rear of Plug |
|
| Pin
Functions : |
|
| Pin 1 |
Supply +3.6 volts see note |
| Pin 2 |
First Analog Input |
| Pin 3 |
Second Analog Input |
| Pin 4 |
Third Analog Input |
| Pin 5 |
Fast Pulse Input |
| Pin 6 |
Common Ground |
|
|
Note: The Supply voltage is
derived directly from the logger battery and will therefore decrease during the life of
the battery. The supply voltage is switched ON 10mSec before data acquisition and is
switched OFF again after data acquisition. |
| Electrical
Characteristics of the Analog Inputs: |
|
- The three analog channels have
identical characteristics.
- Each channel can operate in two modes,
Absolute and Ratiometric.
- The mode of operation is determined by
the probe type selected for that channel.
- The probe type is selected using the Channel
and Probe Setup Tab of the Logger Control Screen in the Omnilog Software.
- Using this software, a different Probe
can be selected for each Channel.
- Temperature (Thermister) , Pressure
and Humidity probes are typically Ratiometric.
- Voltage and current inputs are
Absolute.
| Maximum readable input voltage in Ratiometric
mode |
3.6Volts Nominal see note |
| Maximum readable input voltage in Absolute
mode |
2.048Volts |
| Maximum voltage input without damaging logger |
5 Volts |
| Maximum current to be drawn by the combination
of all three probes |
5mA |
| Input Leakage Current |
0.1uA |
|
|
Note: The maximum
readable voltage in ratiometric mode should be derived from the logger supply (Pin 1) and
will therefore decrease over the life of the battery to a minimum of 2.7 Volts. |
| Electrical
Characteristics of the Fast Pulse Input: |
|
- The fast pulse input can be used in two
modes. Counter or Frequency
- Counter mode is used for
functions such as rainfall.
- Frequency Mode is used for wind
speed or flow sensors.
- The mode of operation is determined by
the probe type selected for that channel.
- The probe type is selected using the
Channel and Probe Setup Tab of the Logger Control Screen in the Omnilog Software.
| Maximum Count Per Logging Period |
65535 |
| Maximum Frequency |
64kHz |
| Preferred Switch Input Type |
Normally Open |
| Preferred Digital Input Type |
Normally High |
| Minimum High Period |
1uSec |
| Mininum Low Period |
1uSec |
| Input Impedence |
470kOhm |
| Prefered voltage input |
3.6 Volts |
| Maximum voltage input |
5.0 Volts |
|
|
Note: This input has
been primarily designed for switch connection ( eg Tipping Bucket Rain Gauge) It has an
internal 470kohm resister pull-up to the internal 3.6 Volt battery. Any device that holds
this input low will cause a constant battery draw of 7.7uA that will shorten the
battery life by up to 3 months. Warning - Due to the fast response time of this input, debounce will
normally be required for switch inputs. |
| Some
Typical Configurations : |
|
 |
