10.1 General Specifications
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Chapter 10 Specifications
5.Noise Measurement Specifications
Calculation channels 1(Select one from CH1 to CH4)
Calculation parameters Voltage/Current
Calculation type RMS spectrum
Calculation method Fixed 500 kHz/s sampling, thinning after digital anti-aliasing filter
FFT calculation word length 32 bits
FFT data points 1,000, 5,000, 10,000, or 50,000 (according to displayed waveform recording length)
Anti-aliasing filter Automatic digital filter (varies with maximum analysis frequency)
Windows Rectangular, Hanning, flat-top
Data update interval Determined by FFT points within approx. 400 ms, 1s, 2s, or 15 s, with gap
Highest analysis frequency 100 kHz, 50 kHz, 20 kHz, 10 kHz, 5 kHz, 2 kHz
Frequency resolution 0.2 Hz to 500 Hz (Determined by FFT points and maximum analysis frequency)
Noise amplitude measurement Calculates the ten highest level and frequency voltage and current peak values (local maxima).
In FFT calculation results, peak values are recognized when data levels on either side are lower.
The lower noise frequency limit can be specified.
6. Motor Evaluation Option Specifications (Models 9791 and 9793)
Number of input channels 3 channels
CH A.......Analog DC input, Frequency input
CH B.......Analog DC input, Pulse input
CH Z....... Pulse input
Measurement input jacks Insulated BNC jacks
Input impedance (DC) 1 MΩ ±100 kΩ
Input methods Isolated and differential inputs (not isolated between channels B and Z)
Measurement parameters Voltage, torque, rotation rate, frequency, slip, and motor power
Maximum input voltage ±20 V (during analog, frequency, and pulse input)
Maximum rated voltage to earth 50 V (50/ 60 Hz)
Measurement category I, 50 V (500 V anticipated transient overvoltage)
Period of guaranteed accuracy 6 months (and 1.5 times specified accuracy for one year)
Conditions of Guaranteed
Accuracy
Temperature and humidity for guaranteed accuracy
80%RH or less
Warm-up time30 minutes or more
Input ...... With 0 V to ground, after zero adjustment
(1)Analog DC Input (CH A/ CH B)
Measurement range ±1 V, ±5 V, ±10 V (when inputting analog DC)
Valid input range 1% to 110%f.s.
Sampling 10 kHz / 16bit
Response time 1 ms (measuring zero to full scale, with LPF off)
Measurement method Simultaneous digital sampling and zero-crossing synchronous calculation system (cumulative aver-
age of intervals between zero crossings)
Synchronization source Same as 3390 power measurement input specification (common to CH A and CH B)
Measurement accuracy ±0.1%rdg. ±0.1%f.s.
Temperature coefficient ±0.03%f.s./°C
Effect of common mode voltage Not more than ±0.01% f.s. (with 50 V [DC or 50/60 Hz] between measurement jacks and 3390 chas-
sis)
Effect of external magnetic field Not more than ±0.1% f.s. (at 400 A/m DC and 50/60 Hz magnetic fields)
LPF OFF/ ON (OFF: 4 kHz, ON: 1 kHz)
Total display area Zero-suppression range setting ±120%
Zero adjustment Zero-corrected input offset of voltage ±10% f.s. or less
(2) Frequency Input (CH A only)
Valid amplitude range ±5 Vpeak
Max. measurement frequency 100 kHz
Measurement range 1 kHz to 100 kHz
Synchronization source 3390 Same as accuracy specifications
Data output interval According to synchronization source
Measurement accuracy ±0.05%rdg. ±3dgt.
Total display area 1.000 kHz to 99.999 kHz
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