Infratek SM201, User Manual, Page: 24 / 28

7.4. FOUR ANALOG OUTPUTS
The four analog outputs Aout0, Aout1, Aout2, and Aout3 are
±
5V outputs proportional to the 4
quantities displayed in the display number fields 0, 1, 2, and 3. Any one of the quantities listed in
the table below can be output.
7-7 7-8
If any other quantity not defined in above table is output over the analog output its value is either
zero or is not defined. The analog outputs are updated synchronously with the display. This
means, that the updating depends on the selected measurement time. The output accuracy is
±
0.1
% of the displayed value. The output impedance is 100
Ω
.
The analog output is 5V for full scale display. For practical purposes we call the voltage ranges
0.6V, 2V, 6V, 20V, .... Because the internal range setting is a 1,
√
10, 10, 10
√
10, 100, ... sequence,
the actual voltage ranges are: 0.2
√
10V, 2V, 2
√
10V, 20V, 20
√
10V, etc. As a consequence in the
2V range the analog output will be 5V for 2.0000V display and in the 6V range the output will be
5V for a display of 6.3244V.
The table below lists the actual voltage-, current-, and shunt ranges for full scale analog output.
For power the products of voltage-times current range determine the display for 5V analog output.
The only exception is the power factor. PF=+1 corresponds to +5V and PF-1 corresponds to -5V
analog output.
The Spectral Multimeter outputs the quantities displayed in the display number fields 0 (Aout 0),
1 (Aout 1), 2(Aout 2), and 3 (Aout 3) as long as they are a set of the above table.
7.5. CURRENT SENSOR MODULES
The current sensor modules provide current measurement capabilities from DC to 10kHz. The
modules are directly supplied from the Spectral Multimeter by connecting the 25 pol D-Sub
connector to the rear panel analog-In-out connector.
Voltage rms rectified mean max min ptp FFT
current
Power Pactiv FFT PF
The current sensor outputs are connected to the 0-5A Spectral Multimeter input. Scaling the
current yields actual current readings. All other quantities are scaled accordingly.
Specifications:
Current range: 25A-1000A Accuracy:
±
0.5 %, 2Hz-200Hz; 1 %, 200Hz-1kHz
Frequency range: DC-10kHz Scaling: required
WARNING: Before applying the primary current to the Hall sensors make sure the supply from
the Analog-in-out connector is installed and the Spectral Multimeter is turned on.
Also make sure the Hall sensor outputs are properly connected.
An open connection could cause damage to the Hall Sensors.
7.6. PRINTER OUTPUT
The Centronics printer output prints measurement data shown in the display number fields. In the
Spectral Multimeter start-up configuration 6 values are displayed. To print these values move the
cursor to the side menu and select the „PRINT“ menu. One value per line is printed. Every line is
terminated by CR/LF.
Ranges and their full scale display for 5V analog output
Voltage:
0.2
√
10V, 2V, 2
√
10V, 20V, 20
√
10V, 200V, 200
√
10V, 2000V
Current:
5
√
10mA, 50mA, 50
√
10mA, 500mA, 500
√
10mA, 5A
1A, 1
√
10A, 10A, 10
√
10A
Shunt:
60mV, 60
√
10mV, 600mV, 600
√
10, 6V
Power:
any product of above voltage ranges times current ranges (or shunt voltage).
Power Factor:
PF=
±
1 corresponds to
±
5V analog output.
7.7. EXTERNAL SYNCHRONISATION
This option provides means to synchronize the Spectral Multimeter measurements to external
TTL-signals. You must deactivate the I/U-synchronization by connecting pin 8 and 9 on the
analog-in / analog-out connector. The Hi-input of the TTL-signal is at pin 21 and the Lo-input at
pin 8/9. The frequency range is 5Hz to 50kHz. The displayed frequency is that of the
synchronization signal.