PERFORMANCE
The Model 6620A provides precision phase measurements with a typical accuracy of 0.02° and a resolution of 0.01° over most of the frequency range. It will accept a wide range of input signal levels from 10mVrms to 320V rms and input waveforms including sine, triangle, square and pulses. A 5 digit LED display provides continuous direct readout of phase angles between 0.00° and 360.00° or ±180°. These two ranges can be manually or automatically selected.

UNIQUE DESIGN
Two common factors that will affect the accuracy of a phasemeter are distortion and/or broadband noise present on either or both of the input signals. A unique circuit design used in the 6620A significantly reduces any effects that may be caused by these two factors.

Another problem found in most phasemeters is the inability to respond to very small phase angles, resulting in fluctuations or inconsistencies in the meter reading (sometimes referred to as ambiguity). To overcome this problem, the 6620A uses a design that eliminates any ambiguities that may occur at readings near 0°, 180° and 360°, and allows measurements as small as 0.01° to be made.

AMC FEATURE
The 6620A employs a technique that eliminates phase reading errors usually associated with component drift called Automatic Meter Correct (AMC). AMC provides instant correction of phase readings for zero and full scale errors, making phase measurements more accurate and reliable.

STANDARD FEATURES
The Model 6620A provides a RELATIVE phase measurement mode which allows the monitoring of phase deviations without having to make unwanted calculations. Also provided are an automatic selection of input voltage range, front panel indicators to indicate a too low/high input voltage range, and an analog output for use with an external meter or strip chart recorder.

APPLICATIONS
The 6620A is the ideal instrument for precision phase angle measurements and provides more performance/dollar than any other phasemeter in its class. A broad range of applications include monitoring servo control systems, low impedance measurements, adjustment of crystal resonance, testing and adjustment of filter networks, controlling laser trimming of resistor networks, measurements in ac power systems, secondary standard and general testing and measurement.

SPECIFICATIONS

FREQUENCY RANGE: 10Hz to 10MHz (1Hz Optional)

PHASE MODE: Absolute or Relative.

ACCURACY

Squarewave: Double the specification.

INPUT
Signal Amplitude: Auto ranging from 0.01V to 320V rms.
Waveforms: Sine, triangle, square and >50ns pulse. (The phasemeter is triggered on the positive going transition of the input waveform. A sinewave on the reference input and a square wave on the signal input is allowed).
Impedance: 1 Megohm in parallel with a 50pF.
Maximum DC Component: ±200 volts.

RESPONSE
Time Constant: >10Hz, less than 500msec; <10Hz, less than 5sec.
Settling Time: To within specified accuracy, within 1 to 8 seconds, dependent on input amplitude and frequency (>10Hz).

DRIFT
Vs. Time (30 days without CALIBRATE reset):
   Sinewave:
      ±0.025° from 20Hz to 100kHz
      ±0.1° at 10Hz
      ±0.1° per 100kHz above 100kHz.
   Squarewave:
      ±0.025° from 10Hz to 5kHz
      ±0.05° to 100kHz
      ±0.1° per 100kHz above 100kHz.
Vs. Temperature (without AMC or CALIBRATE reset):
   ±0.01°/°C, 10Hz to 100kHz
   ±0.05°/°C to 1MHz
   ±0.05°/°C per MHz above 1MHz.

GENERAL
Analog Output: (for use with an external meter or recorder) 0-3.6 or ±1.8 volts dc, 10mV dc/degree phase; Impedance 50 ohms.
Display: 0.5", 7 segment, green LED.
Display Ranges: Automatic, 0.00° to 360.00° or ±180.00°.
Resolution: 0.01°.
Repeatability: Better than 0.01°.
Ambient Temperature Range: 0°C to 50°C.
Front Panel Controls: POWER, METER RANGE Reference Waveform, Signal Waveform, REL PHASE, CALIBRATE (AMC and MAN), phase adjust (0°, 180° and 360°), LOCAL.
Remote Programming: IEEE-488.1 interface.
   Subsets: SH1, AH1, T6, L4, SR1, RL1, PP1, DC1, DT0, C0, E1.
Terminals (BNC):
   Front Panel: REFERENCE and SIGNAL inputs.
   Rear Panel: Analog Output, optional REFERENCE and SIGNAL inputs.
Power Requirements: 90-132V or 198-264V, single phase, 50-400Hz, 40W.
Dimensions and Weights: 3.5" (8.9cm) high, 16.5" (41.9cm) wide, 16" (40.6cm) deep; 15 lbs (6.8kg) net, 18 lbs (8.1kg) shipping.
Accessories: 3-terminal line cord; operating manual.

OPTIONS
Rack Mount Kit: Part No. RK-316 permits the installation of the Model 6620A into a standard 19" rack spacing.
002: 1Hz operation.
003: Rear panel BNC connectors for REFERENCE and SIGNAL inputs.
Extended 1 Year Warranty: Part No. EW6620A.

OPTIONAL ACCESSORIES
CAB-010: GPIB Cable with Connectors, 2-Meters
CAB-011: GPIB Cable with Connectors, 1-Meters
CAB-025: Cable, BNC, 3ft, Low Noise

Specifications are subject to change without notice.

Copyright © August 22, 2006 Krohn-Hite Corporation. All rights reserved.

15 Jonathan Drive, Unit 4, Brockton, MA  02301-5566 U.S.A.
Tel: (508) 580-1660; Fax: (508) 583-8989; info@krohn-hite.com