Model 6900B - Krohn
“Quality” in Test and Measurement Since 1949
DC Source/Calibrators, Tunable Electronic Filters,
Wideband Power Amplifiers
Precision Phasemeters, Distortion Analyzers
Function Generators, RC Oscillators
Model 6900B
Fully Automatic Distortion Analyzer
• 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
DESCRIPTION
AC VOLTMETER
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.
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.
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%.
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.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
Page 1 of 3
6900BData.vp
Fully Automatic Distortion Analyzer
Model 6900B
Residual Distortion and Noise:
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
.1 to .25:
>0.01%
Input
Frequency
Specification
20Hz to 20kHz
<0.02%
5Hz to 1MHz
<0.03%, 5Hz to 50kHz,
rising to 0.5% at 1MHz.
20Hz to 20kHz
<0.01%
5Hz to 1MHz
<0.02%, 5Hz to 50kHz,
rising to 0.5% at 1MHz.
0.1V to 0.25V
0.25V to 130V
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):
Frequency
Specifications
10Hz to 50kHz
±15% of reading or
0.01% whichever is
greater.
Voltage: 100mV rms/% THD.
Impedance: <500 ohms.
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.
10Hz to 50kHz
±15% of reading or
0.005% whichever is
greater.
5Hz to 100kHz
±15% of reading or
0.01% whichever is
greater.
.25 to 130:
>0.005%
100kHz to 500kHz
±15% of reading or
0.05% whichever is
greater.
500kHz to 1MHz
±25% of reading or 0.5%
whichever is greater.
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.
OSCILLATOR OUTPUT
Frequency: 1kHz, fixed.
Settling Time (to 0.1% THD): Typically <3s from 50Hz to
1MHz. Longer at lower frequencies.
Output: 5V rms at 3mA max.
Fundamental Rejection: Greater than 10dB below
residual THD.
Impedance: 600 ohms.
Distortion: <0.003%.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
Page 2 of 3
6900BData.vp
Fully Automatic Distortion Analyzer
Model 6900B
GENERAL
OPTIONS
Meter Display: 0.55", 7 segment, green LED.
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.
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.
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.
OPTIONAL ACCESSORIES
CAB-025: Cable, BNC, 3ft, Low Noise.
Specifications are subject to change without notice.
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.
Krohn-Hite Corporation, 15 Jonathan Drive, Unit 4, Brockton, MA 02301
Tel: 508-580-1660; Fax: 508-583-8989; www.krohn-hite.com; email: sales@krohn-hite.com
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6900BAData.vp
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