Model 323 Wideband True RMS AC Voltmeter
The Ballantine 323 True RMS analog ac voltmeter uses advanced true rms
circuitry to achieve square law response from rugged, fast responding silicon diode
detectors with no thermal lag and overload vulnerability inherent in thermocouple devices.
These true rms meters respond to the equivalent heating power of the
waveform being measured, yielding accurate readings for signals from pure sine waves to
complex waveshapes such as distorted sines, squarewaves, pulses, noise, switching power
supplies signals, and more. Also, when used with instrument shunts, the 323 provides true
rms current measurements on non-sinusoidal waveforms.
Using a Ballantine proprietary suppressed-zero logarithmic voltage scale
(linear dB scale), the 323 provides constant reading accuracy from end to end, as well as
increased resolution and readability.
10 at 0.7 Full Scale, 7 at Full Scale, increasing to 21 at 1/3 Full
Scale, except as limited by maximum input of 330 V rms sinewave or ±465 V pk.
< 30 µV (input terminated with 50Ω
). Noise adds to signal as the square root of the sum of the
Signal High to Low, 2 MΩ || 15 pF, ranges above 30 mV; 2 MΩ || 25 pF, ranges 1 mV to 30mV. Signal
Low to Case ground, > 40 MΩ || 400 pF.
BNC, floating or grounded with respect to chassis.
Convertible to floating or grounded 3/4-inch spaced banana jack binding posts with
supplied Model 618 adapter.
500 V (dc + pk ac) all ranges to 1 kHz. Ranges above 30 mV,
limited to 10Ranges 30 8 V-Hz. mV and below limited to 107 V-Hz.
Common Mode Rejection Ratio
> 120 dB @ dc. > 80 dB at 60 Hz.
Front panel meter time constant control provides selectable
meter responses of 0.25 sec for input frequencies above 100 Hz; 0.5 sec for frequencies
above 40 Hz; 5 sec for frequencies from 2 Hz to 40 Hz.
AC to DC Converter Output
Positive 1 V dc at full scale, to 0.1 V at bottom scale any
range. Accuracy ±1% full scale. Output available simultaneously with meter indications.
Output proportional to mean square of input signal.
24° ± 2 °C, 80% RH, ac mains 117 V ±2%, mains frequency
50 to 420 Hz, warm-up 1 hr. Temperature coefficient typically 0.1% per °C from 15° to
30°C and 0.2% per °C from 0° to 10°C and 30° to 40°C.
323-06, 323-20 ac mains or internal rechargeable NiCad by
front panel switch, 10 W max. Battery operating time 40 hrs.
323-07, 323-21, ac mains only, 10 W max.
ac: 103 to 132V, 206 to 264 V, 50 to 420 Hz
Operating Temperature: 0 °C to 40 °C
Nonoperating Temperature: -40 °C to 75 °C
Humidity: 0 to 80% RH to 40 °C, non-condensing
Operating Altitude:0 to 3 km
Nonoperating Altitude: 0 to 15 km
Size & Weight
H-155 mm (6.1") x W-198 mm (7.8")x D-259 mm
Net: 3.4 kg (7.5 lbs), with battery 4.3 kg (9.5 lbs)
Shipping: 5.4 kg (12 lbs), with battery 6.3 (14 lbs)