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Fluke PM6681/656 - 300 MHz, 50 ps Timer/Counter

Fluke PM6681/656 - 300 MHz, 50 ps Timer/Counter

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300 MHz, 50 ps Timer/Counter including:

  • GPIB-Interface
  • TimeView Time & Frequency Analysis Software for DOS
  • External Reference Frequency Multiplier (1,5,10 MHz)

PM 6681: Breakthrough Timer/Counter/Analyzer Performance

With its revolutionary technology, the PM 6681 from Fluke sets the standard for measurement of time intervals, frequency, phase and jitter. PM 6681 is much more than just a timer/counter. Its speed and resolution are comparable to the most accurate time and frequency modulation domain analyzers. Connected to your PC running Fluke's TimeView™ software, PM 6681 fully matches the functionality of a dedicated modulation domain analyzer, at a fraction of the cost.

Every measuring function you need

No matter what measurement function you need for totalizing, frequency or time-related measurements, you'll find it in the PM 6681 timer/counter. The counter gives you no less than 8 totalize modes, including simultaneous up/down counting and totalizing over a preset time. It also gives you a 4 digit 120 MHz peak reading voltmeter plus phase, duty factor, Vmax./Vmin., pulsewidth and rise/fall time.

Frequency range

The PM 6681 timer/counter spans a frequency range of up to 8 GHz, which enables calibration of microwave links, communications and radar equipment. You can make frequency measurements accurately and easily, not only on continuous carrier waves, but also on burst signals.

Resolution

With the high resolution/speed performance of 11 digits/s, these counters are ideal tools for frequency measurements on telecom systems. Time interval measurements down to 1ps average and 50 ps single shot are supported

Time base options

Time base options include TCXO, High Stability Oven, Very High Stability Oven and Rubidium, giving time base stability of better than 5 x 10-11 per month.

Measuring functions

Frequency, Frequency Burst, Period, Ratio, Time Interval, Pulse Width A, Rise and Fall Time A, Phase A-B, Duty Factor A, Totalize A,B and AC/DC Voltage.

Auxiliary functions

Trigger Hold-Off, External Arming, Statistics (Max, Min, Mean & Std Deviation) and Mathematics.

Bench Instruments   >   Timer/Counters   >  
PM 6681 High Performance Timer/Counter

Measurement Functions
Measurement Functions
 Time Interval, Pulse Width, Rise/Fall Time, Frequency, Burst Frequency, Period, Ratio f1/f2, Phase, Duty Factor, Totalize
Frequency
Input A:10 -10 Hz to 300 MHz
Input B:10 -10 Hz to 100 MHz
Input C:Optional Input Pre-Scaler
 (PM9624): 100 MHz to 2.7 GHz
 (PM9638): 300 MHz to 8 GHz
Resolution:11 digits/s measurement time
Burst Frequency Input A,B,C
Frequency Range Input A:Up to 300 MHz
Frequency Range Input B:Up to 100 MHz
Frequency Range Input C:Up to 8.0 GHz with options
Start Delay Range:200 ns to 1s, 100 ns resolution
Period A
Range:3.3 ns to 10 10 s
Resolution:11 digits/s measurement time
Ratio A/B, C/B
Range:10 -9 to 10 15
Frequency Range:Input A,B: 10 -10 Hz to 160 MHz
 Input C: See input C frequency range.
Time Interval A to B
Range:0 ns to 10 10 s
Resolution:single shot 50 ps (1 ps average)
Frequency Range:Up to 160 MHz
Pulse Width A
Range:3 ns to 10 10 s
Frequency Range:Up to 160 MHz
Rise and Fall Time
Range:3 ns to 10 10 s
Frequency Range:Up to 160 MHz
Input Amplitude:250 mV p-p
Phase A Relative B
Range:-180º to +360º
Resolution:0.01º
Frequency Range:0.03 Hz to 160 MHz
Duty Factor A
Range:0 to 1
Frequency Range:0.11 Hz to 160 MHz
Totalize A,B
Range:0 to 10 17 , 0 to 10 10 in A-B modes
Frequency Range:0 to 160 MHz
A Gated by B:Event counting on input A during the presence of a pulse on input B. Single or cumulative event counting during set measuring time.
A start/stop by B:Event counting on input A between two consecutive pulses on B.
Manual A-B:Input A minus input B event counting with manual start/stop.
Manual/Timed A-B:Input A minus input B event counting with manual start/stop. Stop after set measuring time. Time counted from first trigger event on A.
AC/DC Voltage A,B
Range:-50V to +50 V
Frequency Range:DC, 1 Hz to 100 MHz
Mode:V max, V min, V p-p
Resolution:1.25 mV
Gated Volt:External masking of unwanted signal components such as overshoot

Optional TimeBase
Standard:
PM6681/-1- (Non-Retrofit)
Calibration adjustment tolerance*** at +23ºC ± 3ºC:< 1 x 10 -6
Uncertainty due to: 
Aging /24 hr:N/A*
Aging /month:< 5 x 10 -7
Aging /year:< 5 x 10 -6
Temperature Stability (reference temp at +23ºC):0-50ºC: < 1 x 10 -5
 20ºC -26ºC: £ 3 x 10 -6
Line Voltage variation of ±10%:< 1 x 10 -8
Power On Stability:Not Specified
Total Uncertainty**** at 2 s (95%) confidence interval and at 23ºC ± 3ºC:After 1 Year Cal interval < 7 x 10 -6
 After 2 Year Cal interval < 1.2 x 10 -5
Total Uncertainty**** at 2 s (95%) confidence interval and at 0-50ºC:After 1 Year Cal interval < 1.2 x 10 -5
 After 2 Year Cal interval < 1.5 x 10 -5
OCXO: PM6681/-5- (PM9691)
Calibration adjustment tolerance*** at +23ºC ± 3ºC:< 2 x 10 -8
Uncertainty due to: 
Aging /24 hr:< 5 x 10 -10 **
Aging /month:< 1 x 10 -8
Aging /year:< 7.5 x 10 -8
Temperature Stability (reference temp at +23ºC):0-50ºC: < 5 x 10 -9
 20ºC -26ºC < 6 x 10 -10 (typical values)
Line Voltage variation of ±10%:< 5 x 10 -10
Power-on stability:1 x 10 -7 Deviation versus final value after 24 hr on time, after a warm-up time of: 15 min
Total Uncertainty**** at 2 s (95%) confidence interval and at 23ºC ± 3ºC:After 1 Year Cal interval: < 9 x 10 -8
 After 2 Year Cal interval: < 1.5 x 10 -7
Total Uncertainty**** at 2 s (95%) confidence interval and at 0-50ºC:After 1 Year Cal interval: < 1 x 10 -8
 After 2 Year Cal interval: < 2 x 10 -7
OCXO: PM6681/-6- (PM9692)
Calibration adjustment tolerance*** at +23ºC ± 3ºC:< 5 x 10 -9
Uncertainty due to: 
Aging /24 hr:< 3 x 10 -10 **
Aging /month:< 3 x 10 -9
Aging /year:< 2 x 10 -8
Temperature Stability (reference temp at +23ºC):0-50ºC: < 2.5 x 10 -9
 20ºC -26ºC < 4 x 10 -10 (typical values)
Line Voltage variation of ±10%:< 5 x 10 -10
Short term stability:(root Allan Variance)
 T = 1 s: 1 x 10 -11
 T = 10 s: 3 x 10 -12
 T = 100 s: 1 x 10 -12
Power-on stability:5 x 10 -9 Deviation versus final value after 24 hr on time, after a warm-up time of: 10 min
Total Uncertainty**** at 2 s (95%) confidence interval and at 23ºC ± 3ºC:After 1 Year Cal interval: < 2.5 x 10 -8
 After 2 Year Cal interval: < 5 x 10 -8
Total Uncertainty**** at 2 s (95%) confidence interval and at 0-50ºC:After 1 Year Cal interval: < 2.5 x 10 -8
 After 2 Year Cal interval: < 5 x 10 -8
*N/A: Not discernible, neglectable versus 1°C temperature variation.
**After 48 hours continuous operation
***Calibration Adjustment Tolerance: Is the maximal tolerated deviation from the true 10MHz frequency after a calibration. When the reference frequency does not exceed the tolerance limits at the moment of calibration, an adjustment is not needed.
****Total uncertainty: Is the total possible deviation from the true 10MHz value under influence of frequency drift due to aging and ambient temperature variations versus the reference temperature. The operating temperature range and the calibration interval are part of this specification.

Input and Output Specifications
Input A & B
Frequency Range: 
AC coupled:10 Hz to 300 MHz
DC coupled:DC to 300 MHz
Coupling:AC or DC
Rise time:Approximately 1.1 ns
Impedance:1 MΩ //15 pF or 50Ω , VSWR < 2:1; 1 MΩ//65 pF or 50Ω with PM 9611/80 rear panel inputs
Trigger Slope:Positive or negative
Channel Inputs:Separate, Common A or Swapped
Max. channel timing difference:500 ps
Sensitivity (SineWave):20 mV, up to 100 MHz
 25 mV, 100 MHz to 200 MHz
 40 mV, 200 MHz to 250 MHz
 60 mV, > 250 MHz
Pulse Width:5 ns at 60 mV p-p, > 3 ns at 90 mV p-p
Attenuation:X1 or X10
Hysteresis Window (x1):20 mV p-p
Variable Hysteresis A (x1):30 mV p-p to 10 V p-p up to 120 MHz
Dynamic Range:60 mV p-p to 10 V p-p (up to 100 MHz) within ± 5V window
 75 mV p-p to 10 V p-p (100 to 200 MHz) within ± 5V window
Trigger
Trigger Level:Read out on display
Range:(x1): -5V to + 5V
 (x10): -50V to + 50V
Resolution:(X1): 1.25 mV
Uncertainty:(x1): ±(4 mV + 0.8% of trigger level)
Auto Trigger Level
 Trigger level is automatically set to 50% of input signal.
Frequency:1Hz
Low Pass Filter A
 100 kHz fixed. > 40 dB attenuation at 1 MHz
Digital Low Pass Filter
 1 Hz to 5 MHz using trigger hold off
Trigger Indicator
 Tri-State LED indicator
Trigger Slope
 Positive or Negative
Damage Level
1 M W Impedance:350V (DC + AC peak) at DC to 440 Hz, falling to 12 Vrms (x1) and 120 V rms (x10) at 1 MHz
50 W Impedance:12V rms

Optional Pre-Scalers
Input C (PM 9624)
Frequency Range:100 MHz to 2.7 GHz
Pre-Scaler Factor:32
Sensitivity:20 mV rms to 12V rms, 100 to 300 MHz
 10 mV rms to 12V rms, 0.3 GHz to 2.5 GHz
 20 mV rms to 12V rms, 2.5 GHz to 2.7 GHz
Amplitude Modulation:DC to 0.1 MHz: Up to 94% depth
 0.1 to 6 MHz: Up to 85% depth
 Minimum signal must exceed Input Sensitivity Threshold
Impedance:50Ω nominal, AC coupled, VSWR < 2:1
Max. Voltage without Damage:12V rms pin diode protected
Connector:Type N Female
Input C (PM9638)
Frequency Range:300 MHz to 8 GHz
Pre Scalar Factor:256
Operating Input Voltage Range:300...500 MHz: -21...+30 dBm
 0.5...3.0 GHz: -27...+30 dBm
 3.0...4.5 GHz: -21...+30 dBm
 4.5...6.0 GHZ: -15...+30 dBm
 6.0...8.0 GHz: -9...+30 dBm
Impedance:50Ω nominal, AC coupled, VSWR < 2:1
Max input voltage without damage:7V RMS, pin diode protected
Damage ConnectorType N female

Rear Panel Inputs And Outputs
External Reference Input D
Range:1,2,5 or 10 MHz, > 200 mV signal.
Arming Input E
 Most measurement functions can be performed via arming input.
Range:DC to 100 MHz
Slew Rate:2V/µs
Trigger Level:TTL, 1.4V nominal
Trigger Slope:Positive or Negative
Damage Level:25V peak
Reference Output G
Frequency:10 MHz, Sine Wave
Output:0.5 V rms into 50Ω load, > 0.7 V rms into hi impedance load. AC coupled
Gate Open Output H
Ouput Level:Closed: < 0.4 V
 Open: > 1.4 V into 50Ω
Internal Delay:20 ns
Trigger Level Outputs
Output Level:Trigger Level/Attn Setting
Impedance:100Ω
Probe Compensation Output
 Buffered outputs for input A & B signals. Best used for adjustment of probes to best pulse response for the combination of probe and counter input.
Analog output
 0 to 4.98 V in 20 mV steps, derived from three consecutive digits selected from the measurement result.

Auxiliary Functions
Trigger Hold-Off
Time Delay Range:60 ns to 1.34s, 10 ns resolution
Event Delay Range B:2 to 2 24 -1, max. 100 MHz
External Arming
 External signal on input E can be used to inhibit start and/or stop triggering.
Arming Delay
 Arming can be delayed with respect to the external arming trigger event until either the preset arming time has elapsed or the preset number of trigger events on B has occurred.
Time Delay Range B & E:: 200 ns to 1.6 s, 100 ns resolution
Event Delay Range B:2 to 2 24 -1, negative slope (up to 20 MHz)
Statistics
 Min, Max, Mean and Standard Deviation. Statistics may be applied to all measurement functions with the exception of Manual Totalize.
Sample Size:1 to 2 x 10 9 samples
Mathematics
 Mathematics may be applied to all measuring functions.
Functions:(K*X+L)/M or (K/X+l)/M where: X is the current reading and K,L, and M are selectable constants

Other Functions
Measuring time
 Single cycle, 80, 160, 320, 640, 1280 ns and 20 ms to 20s (or to 400s for some functions)
Display Hold
 Freezes measuring result, until a new measurement is initiated via Restart
Settings
 20 instrument settings can be saved and recalled from internal non-volatile memory. 10 can be user protected.
Auxiliary Menu
 Gives access to additional functions
Display
 10-digit LCD with high-luminance backlight
GPIB Interface
Programmable Functions:All front panel accessible
Interface Functions:SH1, AH1, T6, L4, SR1, RL1, DC1, DT1, E2
Time Stamping (PM 6681):125 ns resolution
Measurement Rate*
Via GPIB:250 readings/s
To Internal Memory:8k readings/s
Internal Memory Size:* Up to 6100 readings
Data Output:ASCII, IEEE double precision floating point
Software: TimeView TM Time & Frequency Analysis Software
 TimeView runs on an IBM PC/AT or compatible with VGA/EGA monitor as a DOS application (standard).
 TimeView 81W for Windows is available as an option
Data Capture Modes and Measurement Rate
Free Running Measurement:8k readings/s
Repetitive Sampling:Up to 10 MHz
Continuous Single-Period:Up to 40k readings/s (200 ns resolution)
Waveform Capture:Available with PM6681
Data Analysis Features:Measurement data vs. time, FFT Graph, Root Allan Variance, Smoothing function, Zoom function, Cursor measurements, Distribution Histogram, Setup and Measurement, Data Archive and Printing
*Depending on measurement function and internal data format

General Specifications
Environmental Data
Operating Temp:0ºC to +50ºC
Storage Temperature:-40ºC to +70ºC
Vibration:3G at 55 Hz per MIL-T-28800D
Shock:Half-sine 40G per MIL-T-28800D. Bench handling. Shipping container.
Reliability:MTBF 30 000 h (calculated)
Safety:According to CE-regulation 73/23 EN61010-1 CAT II, Pollution Degree 2
EMC:Emission according to EN 50081-1, EN 55011 Immunity according to EN 50082-1, inclusive IEC 801-2, -3, -4
Power Requirements
 90V rms to 265V rms, 45 Hz to 440 Hz, 35W
Mechanical Data
Width:315 mm (12.4 in)
Height:86 mm (3.4 in)
Depth:395 mm (15.6 in)
Weight:Net 4 kg (8.5 lb),
 Shipping 7 kg (15 lb)




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