The following specifications are valid for
the power analyzer portion of the CTS.
PC Based A/D Conversion
The Harmonics Analyzer is imple-
mented using a high performance Digi-
tal Signal Processor based PC plug-in
A/D card. This digitizer connects di-
rectly to the Power Analyzer and Con-
ditioning System (PACS) unit through
a shielded cable. No other connections
between the PACS unit and the PC are
required.
The use of a fast multi-channel A/D card
that transfers data to PC memory us-
ing Direct Memory Access (DMA) en-
ables the CTS to perform continuous
measurements without any gaps in
measured data, an important require-
ment for Transitory Harmonics and
flicker testing.
A choice of ISA, PCI or PCMCIA (PC-
Cardbus) options is available to accom-
modate a wide range of PC platforms.
Note: PCMCIA (-MC Option) only sup-
ports single phase CTS configurations.
Signal Conditioning
The Power Analyzer and Conditioning
System (PACS) unit is used to provide
isolation between the PC based acqui-
sition system and the Equipment Un-
der Test (EUT). Precision current trans-
formers provide accurate current sens-
ing over three different current ranges
for maximum resolution. The PC based
acquisition system captures data on all
current ranges and automatically se-
lects the appropriate range to use for
further processing. This eliminates the
need for range switching as is com-
monly done in conventional power ana-
lyzers.
Anti-aliasing filters are provided for all
voltage and current channels to prevent
unwanted frequency components from
affecting the measurement results.
The same PACS unit also provides a
convenient way for the user to connect
the unit under test. A single signal cable
connects between the PC and the
PACS unit and provides all the analog
and digital signals needed to and from
the A/D card.
Measurement Specification Unit
Bandwidth
Anti Aliasing > 60 dB at 5 kHz
Bandpass ripple < 2 % up to 2.5 kHz %
Volts
Range 0.001 - 312.00 V
rms
Max. input 1000 V
peak
Max. crest factor 5:1
Accuracy ±0.1 % ± 0.05 % FS ± 3 mV
Resolution 10 mV
Voltage CMRR 80 dB
RMS Current
Current ranges (Auto ranging) 4, 16, 40 A
rms
Highest range 40.00 A
rms
Max. input [permanent,
no damage if < 200 A
peak
] 40.00 A
rms
Max. Crest Factor [High Range] 5:1
Max. Crest Factor [Low Range] 20:1
Accuracy ±0.1 % ± 0.05 % FS ± 3 mA mA
Resolution 1 mA
Power
Range 0.1 - 12,500 W
Accuracy ±0.25 % ± 0.25 % FS ± 20 mW mW
Resolution 0.1 W
Apparent Power
Range 0.1 12,500 VA
Accuracy ±0.15% ± 0.15% FS±20mVA mVA
Resolution 0.1 VA
Power Factor
Range 0.000 - ± 1.000
Accuracy ± 0.005
Resolution 0.001
Crest Factor
Range 20:1
Accuracy ± 0.005
Resolution 0.001
Frequency
Range 45.0 - 65.0 Hz
Accuracy 0.01 % of reading Hz
Resolution 0.1 Hz
Harmonic Analysis
Range Fundamental to 40
th
Accuracy Fundamental ±0.05% FS±0.05%/kHz
Accuracy Harmonics ±0.1 %±0.1%/kHz
Measurement window 16 periods
Smoothing filter 1.5 sec
Flicker
Pst Range 0.1 - 10 Pst
Accuracy 3 %
Resolution 0.01
Integration time 10 min
Plt Range 0.1 - 10
Integration time 120 min
dmax Range 0 - 100 %
dc Range 0.1 - 100 %
dt Range 0.1 - 100 %
dt over 3% (4%) Range 0 - 1000 ms
CTS Series - Measurement Specifications
Note: For three phase configurations, all specifications are for L-N. Phase angle specifications are valid under balanced load conditions only.
CI400PCI - PCI A/D Card
CI68C - PACS to PC Cable
(12 paginas)
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