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Fluke PM6690-051 - Frequency counter

Fluke PM6690-051 - Frequency counter

no C-input, 300 MHz frequency range
High Stability Oven Time Base; 0.01 ppm/month
Standard inputs
The Fluke PM 6690 timer-counter-analyzer is the most versatile and accurate tool for measuring time, frequency, or phase. On top of that, the PM 6690 has built-in analysis capabilities that give you the dynamics and the statistical behavior of the parameter under test. The PM 6690 offers an intuitive user interface and graphical display which makes it easier to use than any other timer-counter. And all this at a very attractive price!

  • High resolution and speed:
  • 12 digits/sec. frequency measurements
  • 100 ps single shot time-resolution
  • 0.001° phase resolution
  • Frequency range: 300 MHz standard; 3 GHz or 8 GHz input optional
  • Built-in statistical analysis
  • Graphical display gives upto 14 digits resolution
  • Statistical analysis built-in, giving TrendPlot and Histogram display
  • USB and GPIB as standard

More details

Dostupnosť: Nedostupné

Unbeaten speed and resolution
The PM 6690 offers an unprecedented resolution and speed of 12 digits per second for frequency measurements, and 100 ps single-shot time resolution. Phase measurements come with a resolution up to 0.001º, speeded up by a "single pass" technique not found in any other counter before. The instrument speed is also seen in the acquisition speed: up to 250 000 measurements per second are taken and stored in internal memory, or 2,000 measurement per second can be made over the bus. The internal memory can hold as many as 750,000 measurement results for further analysis.

Ease of use
The menu-driven instrument control structure reduces the risk of mistakes. The main measurement result is supported by auxiliary parameter readings, which put an end to the need for other instruments like a DMM or an oscilloscope. You can measure the phase relationship between input and output signal of a device, simultaneously reading the test frequency of the signal and the voltage ratio (in dB) between input and output signals.


The graphical presentation of results, like histogram and trend curve, gives a much better understanding of random signal distribution and of system changes over time.

Auto-trigger automatically sets optimum trigger level and hysteresis adapted to the actual signal applied.

Unique graphical presentation mode
The PM 6690 uniquely offers a graphical display to present the measurement results in numerical (up to 14 digits) or graphical format. The display is also used to present the setup information as part of a convenient, menu-driven control system. The display gives the main measurement as well as auxiliary measurement results, so that commonly asked questions like “What is the attenuation and phase shift of this network?” are answered directly, in a single look at the display.


The results of statistical analysis can be presented as numerical data, as a trend graph, or as a histogram, giving an insight in the behavior of the device under test without the help of external processing – quickly and easily .

Excellent computer connectivity
The PM 6690 is equipped with both a GPIB/IEEE-488 and a USB-interface for high-speed communications with your PC. The GPIB-interface allows an easy integration in larger test systems. Alternatively, thanks to the USB interface, no dedicated GPIB-controller and plug-in card are needed to get fast communications with the PC in small test setups.


The optional TimeView-90W PC software package allows for instrument remote control, and the analysis and display of measurement results in a choice of graphs. For example, results can be displayed as raw data, as a statistical histogram, as a waveform graph (as if you were using an oscilloscope) or as an FFT spectrum graph. TimeView allows analysis of modulation parameters like modulation depth or frequency modulation index.


Plug-and-play in systems
The remote programming allows for remote control of each front panel accessible, using either GPIB/IEEE-488 or the USB-bus. Next to its native, standard SCPI-command structure, the PM 6690 offers a 53131A-emulation mode which allows for an easy exchange of instruments in test systems, requiring virtually no reprogramming.

Bench Instruments   >   Timer/Counters   >  
PM 6690 Counter/Timer/Analyzer
Measurement Features
Measurement Functions
 Frequency, Frequency Burst, Period, Frequency Ratio, Time Interval, Pulse Width, Rise- and Fall-Times, Phase, Duty Factor, Voltage Level
Frequency A, B, C
Input A, B:0.001 Hz to 300 MHz (PM 6690/0xx)
Input C (option):Up to 3 GHz (PM 6690/6xx), up to 8 GHz (PM 6690/7xx)
Resolution:12 digits in 1s measuring time
Aux parameters:Vmax, Vmin, Vp-p
Frequency Burst A, B, C
 Frequency and PRF of repetitive burst signals can be measured without external control signal and with selectable start arming delay.
Functions:Frequency in burst (in Hz)
 PRF (in Hz)
 Number of cycles in burst
Range: Input A, B, C:See Frequency spec.
Minimum burst duration:40 ns (80 ns above 160 MHz)
Minimum number of pulses in burst: 
Input A or B:3 (6 above 160 MHz)
Input C:3 x prescaler factor
PRF range:0.5 Hz to 1 MHz
Start delay range:10 ns to 2 s, 10 ns resolution
Aux parameters:PRF, number of cycles in burst
Period A, B, C Average
Input A,B:3.3 ns to 1000 s
Input C:330 ps to 10 ns (PM 6690/6xx)
 125 ps to 5 ns (PM 6690/7xx)
Resolution:100 ps (single); 12 digits/s (average)
Aux parameters:Vmax, Vmin, Vp-p
Frequency Ratio A/B, B/A, C/A, C/B
Range:10 -9 to 10 11
Input frequency: 
Input A, B:0.1 Hz to 300 MHz
Input C (option):Up to 3 GHz, up to 8 GHz
Aux parameters:Freq 1, Freq 2
Time Interval A to B, B to A, A to A, B to B
Normal calculation:0 to +10 6 s
Smart calculation:-10 6 s to +10 6 s
Resolution:100 ps
Min. pulse width:1.6 ns
Smart calculation:Smart Time Interval to determine sign (A before B or B before A)
Positive and Negative Pulse Width A, B
Range:1.6 ns to 10 6 s
Min. pulse width:1.6 ns
Aux parameters:Vmax, Vmin, Vp-p
Rise and Fall Time A, B
Range:700 ps to 1000 s (max. freq. 160 MHz)
Trigger levels:10% and 90% of signal amplitude, or manual
Min. pulse width:1.6 ns
Aux parameters:Slew rate, Vmax, Vmin
Phase A Relative to B, B relative to A
Range:-180° to +360°
Resolution:0.001° to 100 kHz, decreasing to 0.1° to10 MHz,
 1° to 160 MHz
 Resolution can be improved via averaging (Statistics)
Frequency range:up to 160 MHz
Aux parameters:Freq (A), Va/Vb (in dB)
Positive and Negative Duty Factor A, B
Range:0.000001 to 0.999999
Frequency range:0.1 Hz to 300 MHz
Aux parameters:Period, pulse width
Vmax, Vmin, Vp-p A, B
Range:-50 V to +50 V, -5 V to +5 V, within the ranges of max.
 input voltage
Frequency range:DC, 1 Hz to 300 MHz
Mode:Vmax, Vmin, Vp-p
Resolution:2.5 mV
Auxiliary parameters: 
Mode Vmax:Vmin, Vp-p
Mode Vmin:Vmax, Vp-p
Mode Vp-p:Vmin, Vmax
Time stamping A, B
 Raw time stamp data together with pulse counts on input A or B, accessible via GPIB or USB only.
Max sample speed:See GPIB specifications
Max frequency:160 MHz
Timestamp resolution:100 ps

All measurements are displayed with a main parameter value and smaller auxiliary parameter values (with reduced resolution). Some measurements are available only as auxiliary parameters.

Outputs and Inputs
Inputs A and B
Frequency range: 
DC-coupled:DC to 300 MHz
AC-coupled:10 Hz to 300 MHz
Impedance:1 MΩ// 20 pF or 50 Ω(VSWR ≤ 2:1)
Trigger slope:Positive or negative
Max. channel timing difference:500 ps
DC-200 MHz:15 mVrms
200-300 MHz:25 mVrms
Attenuation:x1, x10
Dynamic range (x1):30 mVp-p to 10 Vp-p within ±5 V window
Trigger level:Read-out on display
Resolution:2.5 mV
Uncertainty (x1):± (15 mV + 1% of trigger level)
AUTO trigger level:Trigger level is automatically set to 50% point of input signal (10% and 90% for Rise/Fall Time) or can be set by the user
AUTO hysteresis: 
Time:Min. hysteresis window (plus hysteresis compensation)
Frequency:33% and 67% of input signal amplitude
Analog noise reduction filter:Nominal 100 kHz, RC-type.
Digital low pass filter:Variable 1 Hz to 50 MHz cut-off frequency
Max input voltage without damage: 
1 MΩ:350 V (DC + AC pk) to 440 Hz, falling to 12 V rms (x1) at 1 MHz
50 Ω:12 Vrms
Optional Prescalers (C-input)
3 GHz RF Input option (PM 6690/6xx)
Rear Panel Inputs and Outputs 
100 to 300 MHz:20 mVrms to 12 Vrms
0.3 to 2.5 GHz:10 mVrms to 12 Vrms
2.5 to 2.7 GHz:20 mVrms to 12 Vrms
2.7 to 3.0 GHz:40 mVrms to 12 Vrms
Prescaler factor:16
Input impedance:50 Ω nominal, VSWR <2.5:1
Max voltage without damage:12 Vrms, pin-diode protected
Connector:Type N Female
8 GHz RF Input option (PM 6690/7xx)
Operating Input Voltage Range: 
300 to 500 MHz:20 mVrms to 7 Vrms
0.5 to 3.0 GHz:10 mVrms to 7 Vrms
3.0 to 4.5 GHz:20 mVrms to 7 Vrms
4.5 to 6.0 GHz:40 mVrms to 7 Vrms
6.0 to 8 GHz:80 mVrms to 7 Vrms
Prescaler Factor:256
Input Impedance:50 Ω nominal, VSWR <2.5:1
Max Input Voltage Without Damage:7 Vrms
Connector:Type N Female
Rear Panel Inputs and Outputs
Reference Input:1, 5, or 10 MHz; 0.1 to 5 Vrms sine
Input impedance:1 kΩ (AC coupled)
Reference Output:10 MHz; > 1 Vrms sine into 50Ω
Arming Input:Arming of all measuring functions
Frequency Range:DC to 80 MHz
Rear panel measurement inputs (option PM6690/xx2):A, B, C
Impedance:Channels A and B: 1 MΩ // 50 pF or 50 Ω (VSWR ≤ 2:1); channel C: 50 Ω
Connectors:Type SMA female for rear input C, BNC for all other inputs/outputs
Auxiliary Functions
Trigger Hold-Off
Time Delay Range:20 ns to 2 s, 10 ns resolution
External Start and Stop Arming
Modes:Start, Stop, Start and Stop Arming
Input channels:A, B or E (External Arming)
Max rep. Rate for Arming signal: 
Channel A,B:160 MHz
Channel E:80 MHz
Start Time Delay Range:20 ns to 2 s, 10 ns resolution
Functions:Maximum, Minimum, Mean, Δ (Max-Min),
 Standard Deviation and Allan Deviation
Display:Numeric, histograms or trend plots
Sample Size:2 to 2*10 9 samples
Limit qualifier:OFF or Capture values above/below/inside or
 outside limits
Measurement pacing 
Pacing time range:2 µs to 1000 s, max 10 k measurements/sec.
Functions:(K*X+L)/M and (K/X+L)/M.
 X is current reading; K, L and M are constants
 which can be set via keyboard or as frozen reference
 value (X0) obtained through earlier measurement
Other Functions
Measuring Time:20 ns to 1000 s for Frequency, Burst and Period Average.
 Single cycle for other measuring functions
Timebase Reference:Internal, External or Automatic
Display Hold:Freezes result, until a new measurement is initiated via Restart
Limit alarm:Indication on front panel and/or SRQ via GPIB
Limit valuesLower limit (limit 1), Upper limit (limit 2)
Settings:OFF or Alarm if value is above/below/inside or outside limits
On alarm:Alarm, STOP or CONTINUE
Display:Numerical + Graphical
Stored instrument set-ups:20 instrument setups can be saved/recalled in non-volatile memory; 10 can be user protected.
Display:Backlit LCD Graphics screen for menu control, numerical read-out and status information
Number of digits:14 digits in numerical mode
Resolution:320 * 97 pixels
GPIB Interface
Programmable functions:All front panel accessible functions
Compatibility:IEEE 488.2-1987, SCPI 1999
 Model 53131A compatibility mode
Interface Functions:SH1, AH1, T6, L4, SR1, RL1, DC1, DT1, E2
Max. measurement Rate 
Via GPIB:2k readings/s (block) or 350 readings/s individually triggered
To Internal Memory:250k readings/s, 100 k readings/s with cal on
Internal Memory Size:750k readings.
USB Interface
USB version:2.0 Full Speed (11 Mbit/s)
Mode:Closed case, menu controlled. One-shot.
Cal. Frequencies:0.1, 1, 5, 10, 1.544 and 2.048 MHz
Environmental Specifications
Environmental Data
Class of Product:Class 3 according MIL-PRF-28800F
Operating Temp:0°C to +50°C
Storage Temp:-40°C to +71°C
Humidity:5% to 95% (10°C to 30°C)
 5% to 75% (30°C to 40°C)
 5% to 45% (40°C to 50°C)
Vibration:Random and sinusoidal according to MIL-PRF-28800F, Class 3
Shock:Half-sine 30G per MIL-PRF-28800F, Bench handling
Transit Drop Test:The optional heavy duty transport case and the soft carrying case have been tested according to MIL-PRF-28800F
Reliability:MTBF 30 000 h (calculated value)
Safety:Designed and tested for measurement Category I, Polution Degree II in accordance with EN/IEC 61010-1:2001; CAN/CSA-C22.2 No 61010.1-04 (incl. approval)
EMC:EN61326 (1997) A1 (1998), increased test levels according to EN 50082-2, Group 1, Class B
Power Requirements
Basic version:90 to 265 Vrms, 45 to 440 Hz, < 40 W
 210 x 90 x 395 mm (8.25 x 3.6 x 15.6 in)
 Net 2.7 kg (5.9 lb),
 Shipping 4.5 kg (9.9 lb)
PM6690 Time Base Options
Timebase Option: Standard (/x1x) High Stability (/x5x) Ultra High Stability (/x6x)
Time Base Type: Standard OCXO OCXO
Uncertainty due to:      
- Aging      
per 24 hours (1) n.a. < 5 x 10 -10 < 3 x 10 -10
per month < 5 x 10 -7 < 1 x 10 -8 < 3 x 10 -9
per year < 5 x 10 -6 < 5 x 10 -8 < 1.5 x 10 -8
- Temperature variation:      
0°C … 50°C < 1 x 10 -5 < 5 x 10 -9 < 2.5 x 10 -9
20°C … 26°C (2) < 3 x 10 -6 < 1 x 10 -9 < 4 x 10 -10
- Power voltage variations      
± 10% < 1 x 10 -8 < 5 x 10 -10 < 5 x 10 -10
Short Term Stability τ = 1 s n.a. < 1 x 10 -11 < 5 x 10 -12
(Root Allan Variance) τ = 10 s n.a. < 1 x 10 -11 < 5 x 10 -12
Power-on Stability: deviation vs. final value after 24 hr ‘on’-time, after a warm-up time of 10 min.: n.a. < 1 x 10 -8 < 5 x 10 -9
Typical total uncertainty, for operating temperature 20°C … 26°C, at 2 σ (95%) confidence interval:      
- 1 year after calibration < 7 x 10 -6 < 6 x 10 -8 < 1.7 x 10 -8
- 2 years after calibration < 1.2 x 10 -5 < 1.2 x 10 -7 < 3.5 x 10 -8

n.a. not discernible, negligible versus 1 C temperature variation
(1) after 1 month of continuous operation
(2) typical values


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