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l Products:

  • Volt-Ampere-Wattmeters

  • AC/DC Voltage-Current Calibrators

  • Sampling Wattmeters

  • Phase Verification Bridges

  • Phase Controlled Precision Current Amplifiers

  • Phase Standards

  • Phase Meters

  • Transconductance Amplifiers (100 A, 100 kHz)

Please contact us for additional information.
 

 



 

Electrical Test Instruments for Power, Energy, Phase and Calibration

Clarke-Hess Communications Research Corp., founded in 1969 by Kenneth K. Clarke and Donald T. Hess, is an electronics test and measurement company specializing in dc/low frequency applications. The company's customers include the worlds national standards laboratories, military agencies and commercial and industrial firms. Dedicated to precision instrumentation, Clarke-Hess has earned a reputation for quality, service and outstanding performance.
2335  HIGH FREQUENCY (1MHz) SAMPLING WATTMETER

  • Dc to more than 1MHz

  • Inputs up to 10A and 1000V

  • 0.2% Uncertainty

  • Low Power Factor Accuracy

  • Peak or RMS Readings

  • Isolated Inputs

  • Harmonic Analysis

  • Multifunction Displays

  • IEEE-488.2 and RS-232

 

2330  SAMPLING WATTMETER (0.2% accuracy to 400kHz)
 

  • Power & Energy

  • Highly Accurate

  • Extremely Broadband

  • NIST Traceable

 

5002  PHASE VERIFICATION BRIDGE
 

  • The Model 5002 Phase Verification Bridge set are passive devices that are used in conjunction with Model 5500-2 Phase Standard and an output indicator such as a true rms voltmeter, an oscilloscope or a wave analyzer to verify that the Phase Standard is continuing to operate within its specified phase accuracy limits. The set comprises four bridges.

 

 

5500-2  PHASE STANDARD (0.001º resolution to 200kHz)
 
  • Simple to Use

  • NIST Traceable

  • Easy to Calibrate

  • 1 m° Phase Resolution

  • 5m° Phase Accuracy

  • 1 Hz to 200 kHz             

  • 50mv to 120V rms Outputs

  • Amplitude Accuracy Typically 0.3% to 100kHz

  • Output Current >15mA

  • Phase Accuracy Maintained for 1000:1 Amplitude Ratios

  • -80dB Typical Distortion

 

 6000 DIGITAL PHASE METER
 

  • Easy to Calibrate

  • Easy to Use

  • Waveshape Independent

  • 10mV to 350V Input Voltages

  • 10,000:1 Input Ratios

  • Completely Autoranging

  • 10m° Resolution

  • 20m° Typical Accuracy

  • 5Hz to 500 kHz  

  • Analog Output

  • Low Drift with Time and Temperature

 

8100 TRANSCONDUCTANCE AMPLIFIER
 

  • Highly Accurate

  • 7 Volt Compliance

  • 100 Amperes to 100 kHz

  • 200 mA to 100A in six ranges

  • 100% over range capability

  • 50ppm short term stability

  • 0.04% dc and 0.10% ac accuracy

  • Accuracy independent of load

  • Distortion below -60dB

  • Complete Front Panel Calibration

  • IEEE-488.2 Interface standard

  • Stable with inductive loads

  • High output impedance

  • Power Factor corrected supplies
    (PF>0.98 at 100A output)

 

VOLT-AMPERE SOURCE
 

  • AC/DC Output

  • Wide Range - 1 Millivolt to 1100 Volts,1 Microampere to 5 Amperes

  • High Accuracy

  • Ease of Operation

  • High Stability

  • Direct Reading Percent Deviation of Output Control

  • High Burden and Compliance Ratings

  • Short Circuit and Overburden Protection

  • Continuous Resolution Run-up for Analog Meter Friction Testing

  • Compact Size for Ease of Portability and Minimum Bench Space Requirements

  • Rapid Warm-up

 

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