5Hz to 1MHz
------------------------------------------
Totally Automatic
------------------------------------------ Distortion Analyzer
& AC Voltmeter
Features
Fully Automatic Distortion Measurements
Frequency Range: 5Hz to 1MHz, Auto Nulling
Voltage Range: 100mV rms to 130V rms, Auto Leveling
Measures Distortion Down to 0.005%
Measures AC Voltage: 0.010V rms to 130V rms, 5Hz to 1MHz
Internal Oscillator: 1kHz, <.003% Distortion
“Hands Off” Operation
Options BCD Output: Provides 13 lines of parallel BCD output, plus 1 MODE
output, 3 decimal point outputs and 4 separate 3-state control lines.
Compatible with DTL, RTL and TTL logic. 002, dB Readout: Switch selectable. Displays the distortion being
measured either in percent (%) or dB, as referenced to the level at the
Analyzer INPUT. Rack Mounting Kit: Part No. RK-316 permits the installation of
the Model 6900B into a standard 19" rack spacing. Extended 1 Year Warranty: Part No. EW6900B.
DESCRIPTION The Krohn-Hite Model 6900B is
the first and only fully automatic Distortion Analyzer to provide an easy
solution to your distortion and AC voltage measurements over the frequency
range from 5Hz to 1MHz.
EASE OF
OPERATION Compare the ease of operation
of the 6900B to any other distortion analyzer. The 6900B requires only an
input signal. Auto frequency nulling, auto level setting and auto-ranging
of the digital meter automatically displays the total harmonic distortion
(THD). The 6900B measures THD from typically 3Hz to an unprecedented 1MHz
and input levels from 100mV rms to 130V rms. Ultra-low distortion can be measured
with a resolution of 0.001%. Measurements can be made in less than 3 seconds
from 50Hz to 1MHz.
FILTERS Three switch-selectable filters
are provided. A 400Hz high-pass to reduce the effects of hum, 30kHz and 80kHz
low-pass to reduce the effects of high frequency noise. An internal low-pass
tracking filter is automatically activated at distortion levels below 0.1%.
AC VOLTMETER As an ac
voltmeter, the 6900B measures rms voltage from typically 3Hz to 1MHz at input
levels from 10mV to 130V with an accuracy of 2%. A 3 digit auto-ranging display
provides 1mV resolution.
ADDITIONAL
FEATURES The Model
6900B provides a distortion output signal which is the input signal after
the fundamental is removed. This distortion signal can be used for additional
analysis with an oscilloscope or spectrum analyzer. An analog output provides
a dc voltage proportional to the distortion signal. An ultra-low distortion
(<.003%) 1kHz sinewave oscillator can be used as a source for checking linearity
of components and system distortion characteristics. An optional BCD output
is available, making the 6900B very useful in an automatic test system. This
fully automatic distortion analyzer is ideal for both precision laboratory
measurements and routine production testing. It provides faster error free
measurements for the unskilled operator.
SPECIFICATIONS
DISTORTION
METER Fundamental Frequency Range:
5Hz to 1MHz automatically tuned over entire specified input frequency range.
An intermittent meter display indicates an “out-of-range” condition. Input: No presetting required over input level from 100mV rms to 130V
rms; Impedance, 110k ohms shunted by 100pF. Distortion Range: A digital panel meter with auto-ranging displays
percentage of total harmonic distortion (THD) to 19.9%.
Measurement (%)
Resolution (%)
.10 to 2.00
.01
2.0 to 19.9
.1
Distortion
Measurement Accuracy:
Input Volts/Dist. Levels
Frequency
Specifications
.1 to .25:
>0.01%
10Hz to 50kHz
±15% of
reading or 0.01% whichever is greater
5Hz to 100kHz
±15% of
reading or 0.02% whichever is greater
100kHz to 500kHz
±15% of
reading or 0.1% whichever is greater
500kHz to 1MHz
±25% of
reading or 0.5% whichever is greater
.25 to 130: >0.005%
10Hz to 50kHz
±15% of
reading or 0.005% whichever is greater
5Hz to 100kHz
±15% of
reading or 0.01% whichever is greater
100kHz to 500kHz
±15% of
reading or 0.05% whichever is greater
500kHz to 1MHz
±25% of
reading or 0.5% whichever is greater
Residual Distortion
and Noise:
Input
Frequency
Specification
0.1V to 0.25V
20Hz to
20kHz
<0.02%
5Hz to 1MHz
<0.03%,
5Hz to 50kHz, rising to 0.5% at 1MHz.
0.25V to 130V
20Hz to
20kHz
<0.01%
5Hz to 1MHz
<0.02%,
5Hz to 50kHz, rising to 0.5% at 1MHz.
Settling Time
(to 0.1% THD): Typically <3s from 50Hz to 1MHz. Longer at lower frequencies. Fundamental Rejection: Greater than 10dB below residual THD. Filters: 400Hz High-Pass: –3dB at 400Hz ±10%, 40dB/decade rolloff.
30kHz Low-Pass: –3dB at 30kHz ±5%, 60dB/decade rolloff.
80kHz Low-Pass: –3dB at 80kHz ±5%, 60dB/decade rolloff. Distortion Output (Residual signal after fundamental is nulled): Voltage: 100mV rms/% THD.
Impedance: <500 ohms. Analog Output: 100mV dc/% THD. Impedance: <1k ohms. Display: 3 digit meter with auto-ranging.
AC VOLTMETER Frequency Range:
5Hz to 1MHz. Voltage Range: 0.01V rms to 130V rms.
Voltage
Range
Resolution
0.01V to 1V
0.001V
1V to 10V
0.01V
10V to 130V
0.1V
Accuracy:
±2% ±1 digit from 10Hz to 500kHz; ±5% ±1 digit from 5Hz to 1MHz over specified
voltage range. Display: 3 digit meter with auto-ranging. Input Impedance: 110k ohms shunted by 100pF.
GENERAL Meter Display:
0.55", 7 segment, green LED. Controls: Front Panel: Mode switch for selecting either VOLTMETER or DISTORTION
operation. Filter switch for
selecting 400Hz high-pass, 30kHz low-pass or 80kHz low-pass operation.
Power switch.
Rear Panel: Switches for selecting 120/240V ac line operation, or NORMAL/LOW
ac line voltage. Connectors (BNC): Front Panel: Input, 1kHz oscillator output and distortion output.
Rear Panel: Input, analog output. Operating Temperature Range: 0°C to 45°C. Maximum DC Component: 100V. Isolation to Chassis: 500V dc. Power Requirements: Switch selectable, 90-110, 108-132, 180-220 or
216-264 volts,
single phase, 50-400Hz, 15 watts. Dimension and Weights: 3" (8.9cm) high, 16" (42.2cm) wide, 14" (37.5cm)
deep; 11 lbs (5.2kg),
shipping, 13 lbs (6.1kg). Accessories: 3-terminal line cord; operating manual.
OPTIONS BCD Output: Provides
13 lines of parallel BCD output, plus 1 MODE output, 3 decimal point outputs
and 4 separate 3-state control lines. Compatible with DTL, RTL and TTL logic. 002, dB Readout: Switch selectable. Displays the distortion being measured
either in percent (%) or dB, as referenced to the level at the Analyzer INPUT. Rack Mounting Kit: Part No. RK-316 permits the installation of the
Model 6900B into a standard 19" rack spacing. Extended 1 Year Warranty: Part No. EW6900B.
