Phasemeter - Model 6000
 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
5 Hz to 500 kHz
Analog Output
Low Drift with Time and
Temperature
USER FRIENDLY
The Model 6000 Phasmeter automatically selects the proper range for both amplitude and
phase and is waveshape independent. The user only needs to connect the two input cables to
the Phase meter to obtain a phase reading. Overrange and Underrange LED's indicate whether
either of the two input signals is too large or too small. An OFFSET toggle on the front
panel allows the user to make differential phase measurements without the need of
subtracting large numbers. No front panel screwdriver adjustments for any function of the
phasemeter are required.
IEEE-488 INTERFACE STANDARD
The Model 6000 Phasemeter has an optically isolated IEEE-488 1978 interface as a standard
feature. Via the Bus interface the user can read the display, toggle the phase range, and
check for input signal overrange or underrange, front panel selected offset and phase
range. The optical isolation prevents ground loops (and the resulting phase errors)
between the input signals and the digital bus controller circuits.
TWO PHASE RANGES - EXCELLENT TRACKING
The Model 6000 Phasemeter has two phase ranges: The 0° to 360° range and the ±180° range. Range switching occurs either automatically when the
display indication approaches within 10° of the range limit or
manually when the front panel RANGE toggle switch is pressed. In the regions where the
ranges overlap, differences of less than ±10m° result when switching occurs.
NOISE IMMUNITY
Unique circuitry, including filter banks which switch in automatically as the input
frequency is decreased and unipolar hysteresis around the comparators, enables the Model
6000 Phasemeter to operate to low frequencies with input signals which have been corrupted
by noise or other disturbances without erratic operation. Keyboard control allows removal
of the filters for optimum square wave measurements. Display indicates whether filters are
"in" or "out" of the circuit.
WIDE FREQUENCY RANGE
The Model 6000 Phasemeter operates with input frequencies between 5Hz and 500kHz. For
frequencies between 10Hz and 50kHz typical accuracies are ±20m° regardless of amplitude ratios which may exceed 10000:1.
WAVESHAPE INDEPENDENT
The high accuracy of the Model 6000 Phasemeter is maintained not only for sinewaves but
also for square waves and triangular waves. Unique internal circuitry produces waveform
independent phase readings; hence, the user does not have to activate any front panel
waveform selection switches. Two different waveforms of the same frequency may be applied
to the Phasemeter simultaneously.
AUTOMATED CALIBRATION
The inclusion of the IEEE Bus allows both the USE and the CALIBRATION checking of the
Model 6000 to be easily automated.
HIGH ACCURACY/LOW DRIFT
Typical accuracy of ±20m° and
low drift are obtained by complete circuit integration under microprocessor control.
Potential drifts due to voltage variations are eliminated by differential dual slope
analog to digital converters. Effects of analog offsets are eliminated with the use of
dual comparators in each channel.
HIGH INPUT RATIOS
Accuracies of ±50m° (typically ±20m°) are maintained not only with
equal amplitude signals in both channels but also with amplitude ratios in excess of
1000:1 (60db) between the signals.
ROBUST INPUT PROTECTION|
Unique input protection circuitry allows for the sudden application of high input voltages
without fear of damage to the Model 6000 Phasemeter. There is no need to slowly increase
the levels of input voltages.
FLOATING INPUTS
Neither input of the Model 6000 Phasemeter is connected to chassis ground; hence
measurements may be made on networks with "earth ground" connections without
creating ground loops with their resultant phase errors.
FAST SETTLING TIME
The Model 6000 Phasemeter settles to within its specified accuracy typically within 5
seconds following an abrupt change in input conditions.
EVEN HARMONIC REDUCTION
The Model 6000 Phasemeter has been designed to reduce phase errors caused by the presence
of even harmonic distortion present in one input channel and not the other. For example, a
1% second harmonic distortion component in one channel produces a phase error of less than
5m° which is less than the minimum phase resolution of the
Phasemeter.
SPECIFICATIONS
PHASE
| Ranges: |
Two Ranges 0° to 360° and -180° to 180°. Range switching is accomplished automatically when operation approaches
within 10° of the range limits. |
| |
|
| Resolution: |
10m° (0.01°) |
| |
|
| Repeatability: |
±10m° or better |
| |
|
| Accuracy: |
±200m° from 5Hz to 10Hz |
| (Sine Waves) |
±50m° from 10Hz to 50kHz |
|
±[50 + 2(fkHz - 50)]m° from 50kHz to 100kHz |
|
±[150 + 3.5(fkHz - 100)]m° from 100kHz to 500kHz |
| |
|
| Accuracy: |
±[50 + (fkHz)]m°
(Equal Amplitudes) |
| (Square Waves) |
±[50 + 4.4(fkHz)]m° (Unequal Amplitudes at Range Limits) |
| |
|
| Offset: |
The OFFSET toggle subtracts the current phase
reading from all subsequent phase readings. The range about the Offset point is
±180° which is independent of phase
autoranging. |
INPUT CHARACTERISTICS-EITHER CHANNEL
| Amplitude Range: |
10mV RMS to 350V RMS in three ranges: 10mV
to 500mV RMS, 500mV to 12.5V RMS and 12.5V to 350V RMS. Range switching is
accomplished automatically when operation approaches within approximately 10% of the range
limits. (From 10mV to 20mV derate phase accuracy by a factor of 2.) |
| |
|
| Input Impedance: |
1MW in parallel with less than 50pF. Front Panel BNC |
| |
|
| Input Waveforms: |
Sine, Triangle, Trapezoidal or Square. The
Phasemeter provides a reading proportional to the average of the difference between the
positive zero crossings and the difference between the negative zero crossings of the
inputs. These zero crossings are determined after the waveforms are AC coupled. |
| |
|
| Maximum dc Input: |
The dc component of either input waveform should
be 200V or less. |
| |
|
| Frequency Range: |
5Hz to 500kHz |
RESPONSE TIME
| |
Less than 6 seconds to specified accuracy |
DISPLAY
|
0.5" High Efficiency LED Display for Phase. Small High
Efficiency LED Lamps to indicate Phase Range, REMOTE, Phase OFFSET ON, and OVERRANGE and
UNDERRANGE for both input channels. |
CONTROLS
| Front Panel: |
Phase OFFSET key switch, LOCAL key switch and
Phase RANGE toggle key switch |
| Rear Panel: |
Five position IEEE-488 Address switch |
ANALOG OUTPUT
|
+1.80 to -3.60V DC with a sensitivity of -10mV/° and an accuracy of ±0.5% + phase accuracy.
250ohm output impedance. Rear Panel BNC |
IEEE-488 SUBSETS
| |
SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT0 |
WARM-UP TIME
| |
Less than 30 minutes for all specifications |
TEMPERATURE RANGE
| |
Specified Accuracy: |
23°C ±5°C |
| |
Safe Operation: |
0°C to 50°C |
RELATIVE HUMIDITY
| |
Specified Accuracy: |
20% to 75% RH |
| |
Safe Operation: |
5% to 90% RH |
LINE VOLTAGE, FREQUENCY AND POWER CONSUMPTION
| |
100V ±10%, 120V ±10%, 220V ±10%, 240V ±10% (Rear Panel switch selectable), 50Hz - 60Hz
Power Consumption less than 20W |
PHYSICAL
| |
Rack or bench mount. Bail allows 10° upward tilt. |
| |
Weight: 5.1kg (11 pounds) |
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Size:
48.3cm x 8.9cm x 33.0cm (19" x 3.5" x 13") |
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