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Model 10A69-4
 Quad AC RMS Conditioner

Input Type Description SPS6000 SPS8000 System 10
Voltage Quad AC RMS X-X
 X-X
 X*X


Functionally similar to the Model 10A68-2, the Model 10A69-4 accepts up to four independent AC voltage signals (only), mixed as desired. The three millivolt ranges (50, 100, and 200 mV-AC) are intended primarily for current measurement by means of an external shunt. Unlike the Model 10A68-2, the 10A69-4 has no auxiliary outputs from wire-wrap pins, and can only be used in System 10.

"Absolute" calibration may be used for a 10A69-4 channel if the parameter being measured is voltage itself. "Two-point" ("deadweight") calibration should be used if the voltage input signal is an analog of some other parameter that has at least two independently and accurately known calibration values.

The table below gives for each allowable full-scale input range the normal-mode input impedance (Zi), maximum normal-mode input voltage with no instrument damage (Vmax), and bandwidth flat to 0.2%, 1%, and 3 dB, respectively.

Specifications:
  • Transducer Types: AC signal sources (voltage only) that provide their own power supply
  • Input Voltage and Current Ranges: 50 mV-AC through 200 V-AC (see table for precise ranges); automatically selected- on an individual channel basis- when the channel is configured
  • Amplifier (per channel): Selectable gain, followed by high-pass filter with RMS Converter (see table for bandwidths)
      Common-Mode Range: ±1000 V operating and without instrument damage
      Common-Mode Rejection Ratio: DC: infinite; at 60 Hz: -60 dB
      Common-Mode Input Impedance: Infinite at DC shunted by 100 pF
      Offset: Initial: ±0.2% of full scale; vs. Temperature: ±20 ppm/°C; vs. Time: ±50 ppm/month
      Gain Accuracy: ±0.02% of full scale typical, following calibration*
      Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±50 ppm/month
  • Filter (per channel): 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at 50 Hz
      Step-Response Settling Time (Full-Scale Output):
      To 1% of final value: 100 msec
      To 0.1% of final value: 150 msec
      To 0.02% of final value: 600 msec
  • Auxiliary Outputs: None
    *Initial (uncalibrated) inaccuracy may be as great as ±0.2% of full scale(see "Accuracy Specifications"). Maximum error that could occur upon replacement of a Model 10A69-4 not followed by calibration is ±0.4% of full scale.
Model 10A69-4 Input Characteristics
Range
Zi
Vmax
Bandwidth
(to 0.2%)
Bandwidth
(to 1%)
Bandwidth
(to 3 dB)
50 mV-AC
100 mV-AC
200 mV-AC
 1 k-ohm
1 k-ohm
1 k-ohm
 10 V-AC
10 V-AC
10 V-AC
 45 Hz-1 kHz
45 Hz-1 kHz
45 Hz-1 kHz
 12 Hz-3.2 kHz
12 Hz-3.2 kHz
12 Hz-3.2 kHz
 10 Hz-22 kHz
10 Hz-16 kHz
10 Hz-9 kHz
5 V-AC
10 V-AC
20 V-AC
 100 k-ohm
100 k-ohm
100 k-ohm
 100 V-AC
100 V-AC
100 V-AC
 45 Hz-4 Hz
45 Hz-4 Hz
45 Hz-4 Hz
 12 Hz-20 kHz
12 Hz-10 kHz
12 Hz-5 kHz
 10 Hz-40 kHz
10 Hz-20 kHz
10 Hz-9 kHz
50 V-AC
100 V-AC
200 V-AC
 1 M-ohm
1 M-ohm
1 M-ohm
 250 V-AC
250 V-AC
250 V-AC
 45 Hz-2 kHz
45 Hz-2 kHz
45 Hz-2 kHz
 15 Hz-9 kHz
15 Hz-9 kHz
15 Hz-9 kHz
 10 Hz-40 kHz
10 Hz-21 kHz
10 Hz-10 kHz


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