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Distortion Meter HM8027
I Frequency Range: 20Hz to 20kHz
I Resolution: 0.01%, maximum
I Display: 3 Digit LED
I Automatic Frequency Fine-Tuning
I Monitor Output for Distortion Analysis
The HM8027 Distortion Meter was deve-
loped for the measurement of harmonic
distortion in the audio frequency range.
Due to its low inherent distortion of
0.005% (1kHz), it is ideally suited for tests
and measurements of high-grade audio
systems.
The digital display allows distortion readout
with a maximum resolution of 0.01%. In
addition, the HM8027 has the option to
visually check the residual distortion of
the measured signal on an oscilloscope
connected to its control output. This feature
enables a qualitative evaluation of the
Specifications
(Reference Temperature: 23°C ± 1°C)
Frequency Range:
Frequency Range: 20Hz to 20kHz
Range Steps: 3 Decade Steps
Variable Frequency Control: 10:1 (overlapping
ranges)
Distortion Measurement Range:
Measurement Range: 0.01% - 50%
divided in 2 ranges
Full Range: 10% and 100%
Resolution:
100% Range: 0.1%
10% Range: 0.01%
Accuracy:
100% Range: ±5%±1 digit for k≤10%
10% Range: ±5%±1 digit for k≤1%
Residual Distortion and Noise: ≤ 0.5 digit
Fundamental Rejection:
30dB greater than measured distortion factor
or ≥70dB in the 100% range
or ≥90dB in the 10% range
Input Voltage:
min. for 100% Calibration: 300mV
max. for 100% Calibration: 50V
Input Impedance:
Sous réserve de modifications / Reservado el derecho de modificatión
100kΩ
reading for signals with noise or cross-over
distortion beyond the indicated distortion
value. Test frequency adjustments are
performed via a rotary dial and push-button
frequency range selectors. The automatic
frequency fine-tuning with a 15% capture
range ensures fast and easy operation of
the HM8027.
The Distortion Meter HM8027, combined
with the Sine Wave Generator HM8037,
provides a complete test system to be used
primarily in the audio frequency range. The
clearly arranged front panel assures prob-
lem-free operation.
Monitor Output:
Output Voltage: 1mV/digit
(short circuit proof)
Output Impedance: 10kΩ
Attenuators:
(1 pushbutton switch) −20dB
(1 pushbutton switch) −10dB
(1 continuous variable attenuator) −15dB
General Information:
1 switch selectable high-pass filter 1kHz,
12dB/Octave
Supply Voltages (from HM8001):
+12V/60mA
−12V/60mA
+5V/100mA
(∑ = 1.94W)
Operating conditions:
0°C to +40°C
Max. Relative Humidity: 80%
Dimensions (without 22-pin flat connector):
W135, H68, D228mm
Weight: approx. 650g
Values without tolerances are meant to be
guidelines and represent characteristics
of the average instrument.
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