Analog Output - Model 4465Cf; Pc Interface – Model 446580 - Extech Instruments 4465CF User Manual

Analog Output - Model 4465CF

The Model 4465CF has an analog output whereby the user can connect a datalogging
device such as a chart recorder to capture temperature and humidity readings. The analog
output jack located on the right side of the Model 4465CF accepts a TIP-RING-SLEEVE
3.5mm phono plug (detailed below).
The analog output signal is 10mVDC per Temperature degree (with TEMP selected on
front panel switch) or 10mVDC per Relative Humidity percentage unit (with %RH selected
via front panel switch). For example, for a temperature of 65
would be 650mVDC. For a humidity of 50% the analog output signal would be 500mVDC.
The output impedance of the analog circuit is 50 ohms.
PC Interface – Model 446580
Data Acquisition and Datalogger modes
The Model 446580 can perform DATALOGGING and DATA ACQUISITION functions.
These two modes of operation, distinctly different, are explained separately.
In the Datalogger mode, the meter records data remotely then, at a later time, the meter is
connected to the PC and the readings are transferred.
In the Data Acquisition mode, the meter takes readings while connected to the PC. The
readings are taken, displayed, and stored all at the same time.
These two modes are discussed in the subsequent sections:
Datalogging Mode
The meter can log up to 7000 readings that can later be transferred to a PC. The benefit is
that the meter can record remotely without having to be connected to a PC. The supplied
TM
Windows software allows the user to transfer data from the meter to a PC at any time.
Before Datalogging, the user must first set the sampling rate and the real time clock.
Please reading the remaining sections of this manual for instructions on these and other
functions including datalogging, downloading data from the meter to a PC, and the Data
Acquisition mode of operation.
Connecting the Model 446580 to a PC
The Model 446580 has an RS-232 PC Interface jack on its right side. The supplied mini-
plug to DB9 cable (see diagram) is used to connect the meter to a PC. The phono plug end
of the cable is inserted in the meter's PC interface jack and the DB9 (9-pin) side is inserted
into an available serial port on the PC. Do not run the supplied software until the meter is
properly connected to the PC.
DB9 connector
3.5mm phono plug
SLEEVE: Ground to PIN5 of DB9
3.5mm phono plug
4
SLEEVE RING (both Ground)
TIP (DC Voltage)
o
F the analog output signal
TIP: Transmit (Tx) to PIN3
RING: Receive (Rx) to PIN2 of DB9
Model 446580 Version 2.0 June 2004