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Fluke PM6685-051 - Very High Stability Oven Timebase

Fluke PM6685-051 - Very High Stability Oven Timebase

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Very High Stability Oven Timebase (PM 9691)
Standard Time base oscillator
The Fluke PM 6685 Frequency Counter brings calibration lab accuracy to field measurements

The PM 6685 is easy to use, compact, and most important of all, it has today's smartest input triggering for frequency measurements. The battery option for the PM 6685 maintains oven stability for 20 hours, giving you instant oven performance even after long transportation.

Cal lab performance in the field

With 10 digits per second resolution, plus overflow (11th and 12th digits), it delivers high accuracy measurements instantly. The standard timebase offers a stability of better than 5E-7 per month, and better than 5E-11 per month with the PM 6685R Rubidium Counter.

Built in capabilities simplify tricky measurements

The PM 6685's built-in intelligence eliminates a lot of button pushing. Just plug it in, and it automatically selects optimum trigger level and input sensitivity for excellent noise immunity.

Analog bar graph

The analog bar graph displays signal strength and input sensitivity to assist instrument setup and RF tuning applications.

300 MHz basic input range; options for 2.7 GHz and 8 GHz.

Measurement functions

Frequency, Burst Frequency, Period A, Ratio A/E C/A, Pulse Width A, Duty Factor, Totalize A.

Auxiliary functions

External Arming, External Gate, Nulling/Frequency Offset.

Options & accessories

External Reference Multiplier (1,5,10 MHz), GPIB Interface, Battery Unit.

Calibration Instruments   >   Time and Frequency Instruments   >  
PM 6685 Universal Frequency Counter
Measurement Functions
Measurement Functions
  Frequency, Burst Frequency, Period, Ratio f1/f2, Pulse Width, Duty Factor, Totalize A
Frequency A, C
Input A: 10 Hz to 300 MHz
Input C (Optional Input Pre-Scaler): PM9624: 100 MHz to 3.0 GHz
  PM9638: 300 MHz to 8.0 GHz
Resolution: 10 digits/s measurement time
Burst Frequency A
Frequency range: 100 Hz to 80 MHz
PRF range: up to 1 MHz
Burst duration: 0.5 μ to 1.5 s,min. 3 cycles in burst
Burst Frequency C
Frequency range: 100 MHz to 8GHz
PRF range: up to 1 MHz
Burst duration: 0.5 μs to 1.5 s
Period A
Range: 3.3 ns to 100 ms
Resolution: 10 digits/s measurement time
Ratio A/E, C/A
Range: 10 -9 to 10 9
Frequency range: Input A: 10 Hz to 300 MHz (prescaling factor 4)
  Input E: 10 Hz to 80 MHz
  Input C: See input C frequency range
Pulse Width A
Range: 6 ns to 10ms
Frequency range: 50 Hz to 60 MHz
Voltage range: 100 mV p-p to 70 V p-p
Duty Factor A
Range: 0 to 1
Frequency range: 50 Hz to 60 MHz
Voltage range: 100 mV p-p to 70 V p-p
Totalize A
  Event Counting on A with manual start and stop
Range: 0 to 10 14
Frequency Range: 0 to 100 MHz
Optional TimeBase
Standard: PM6685/-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 2σ (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 2σ (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: PM6685/-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 2σ (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 2σ (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: PM6685/-6- (PM9692)
Calibration adjustment tolerance* * * at +23ºC ± 3ºC: < 5 x 10 -9
Uncertainty due to:  
Aging /24 hr: < 1 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: 5 x 10 -11
  T = 10 s: 5 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 2σ (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 2σ (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 14 days 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
Frequency Range: 10 Hz to 300 MHz
Coupling: AC
Impedance: 1 MΩ//25pF or 50Ω, VSWR < 2:1
Sensitivity (SineWave): 10 mV rms, 10 Hz to 50 MHz
  15 mV, 50 MHz to 100 MHz
  20 mV, 100 MHz to 150 MHz
  30 mV, 150 MHz to 200 MHz
  50 mV, 200 MHz to 300 MHz
Pulse: 50 mV p-p, 3 ns minimum pulse width
Dynamic Range: 30 mV p-p to 70V p-p
Manual Trigger
Sensitivity Range:  
  10 mV rms to 10 Vrms, variable in 3 dB steps, indicated on bar graph
Trigger Level: Selectable for optimum triggering on
  waveforms with duty factors of <0.25, 0.25 to 0.75 and
  0.75
Trigger Slope: Positive or Negative
Auto Trigger
  Automatic setting of input signal conditioning circuits for
  optimum triggering on different amplitudes and
  waveforms
Frequency: Minimum 50 Hz
Sensitivity Range: 10 mV rms to 25V rms
Signal Monitor
  A bar graph displays actual input signal level in 3 dB
  steps, 10 mV rms to 10 Vrms
Low Pass Filter
  100 kHz nominal 3 dB point
  Minimum 40 dB attenuation at 1 MHz
Damage Level
1 MΩ Impedance: 350V (DC + AC peak) at DC to 440 Hz, falling to 12 Vrms
  at 1 MHz and above
50 Ω Impedance: 12 V rms
Auxiliary Functions
External Arming/External Gate
  External signal on input E can be used to inhibit start
  and/or stop triggering
  Stop arming is not applicable to Pulse Width and Duty
  Factor measuring modes
Start Arming Delay
  OFF or 200 ns to 5s in 100 ns steps
Nulling/Frequency Offset
  Nulling enables measurements to be displayed relative to
  a previously measured value or any value entered in via
  front panel keys
Optional Pre-Scalers
Input C (PM 9624)
Frequency Range: 100 MHz to 3.0 GHz
Pre-Scaler Factor: 64
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
  100 mV rms to 12V rms, 2.7 GHz to 3.0 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
Impedance: 50Ω nominal, ac coupled, VSWR < 2.5:1
Damage Level: 12V rms pin diode protected
Connector: Type N Female
Input C (PM9638)
Frequency Range: 3 MHz to 8 MHz
Prescalar Factor: 256
Operating Input Voltage Range: 300...500 MHz: -21...+30 dBm
  0.5...3 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: 500 Ω nominal, AC coupled, VSWR <2:1
Max Input Voltage Without Damage: 7 V RMS, pin diode protected
Damage Connector: Type N female
External Reference
Input D
  The use of external reference is indicated on the front
  panel display
Input Frequency: 10 MHz
  with optional reference multiplier PM 9697
Voltage Range: 200 mV rms to 10V rms
Impedance: Approximately 1 kΩ, ac coupled
Input E
  Used in ratio A/E and external arming / gating modes
Frequency Range: DC to 80 MHz
Pulse Width: 6 ns minimum
Slew Rate: 2V/μs minimum
Trigger Level: TTL level, 1.4 V nominal
Trigger Slope: Positive or Negative
Impedance: Approximately 2 kΩ, dc coupled
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
Options (Battery Unit PM 9623)
Battery Unit (Option PM 9623)
  The PM 9623 is a rechargeable battery unit for mounting
  inside the counter
Battery Type
  Sealed lead-acid cells
Battery Capacity
  at 25ºC
Standby Mode: Typically 20 hours with Oven Time Base
Operating Mode:  
  Typically 3 hours without options, 2.5
  hours with Oven Time Base, and 2 hours with Oven Time Base and Input C
Recharge Time
  Typically 8 hours in standby mode
Battery Protection: Overcharge and deep discharge protection
External DC: 12V to 24V via socket on rear panel (16V
  to 24V to charge internal battery)
Line Failure Protection: Counter automatically switches
  to internal battery or external DC when the line voltage falls below 90V AC
Temperature
Operating: 0ºC to +40ºC
Storage: -40ºC to +50ºC
Weight
  1.5 kg (3.3 lb)
Options (GPIB PM 9626/31)
Programmable Functions
  All front panel and AUX MENU functions
Compatibility
  IEEE 488.2-1987, SCPI 1991.0
Interface Functions
  SH1, AH1, T6, L4, SR1, RL1, DC1, DT1, E2
Maximum Measurement Rate to Internal Memory
  200 to 1600 readings/s, depending on measurement
  function and internal data format
Internal Memory Size
  764 to 2600 readings, depending on measurement
  function and internal data format
Maximum Bus Transfer Rate from internal memory
  150 to 1000 readings/s, depending on internal data
  format and output data format
Data Output Format
  ASCII, IEEE double precision floating point
Time Out
  Off or 100 ms to 25.5s in 100 ms steps
Analog Output
  0 to 4.98V in 20 mV steps, derived from three
  consecutive digits selected from the measurement result
Output Impedance
  200Ω
Other Functions
Measuring time
  Single Cycle, 100 ns to 15 s
Local/Preset
  Go to local function in remote mode, or preset counter
  to default setting in local mode
Restart
  Starts a new measurement
Display Hold
  Freezes measuring result
Check
  Applies 10 MHz to the measuring logic
Display
  LCD with high-luminance backlight
Number of Digits
  10 digits plus exponent
Blanking
  Least significant digits can be blanked
Bar Graph
  Displays input signal level or sensitivity setting in 3 dB
  steps
Auxiliary Menu
  The following functions are available from the AUX MENU
  and via the GPIB interface
Save/Recall
  20 complete instrument settings. 10 settings can be user
  protected
GPIB Address
  Read and temporarily change via front panel keys. (Set
  new address on rear panel switch.)
Burst Frequency
  Set input A and C synchronization delay time
PRF
  Set input A and C synchronization delay time
Trigger Slope
  Positive or negative slope
Arming Start
  Positive or negative slope, set start arming delay time
Arming Stop
  Positive or negative slope
Null
  Read and change stored offset frequency
Display Overflow
  Display of the 11th and 12th digits
Test
  Select selftest
Program Version
  Display instrument and GPIB program versions
Time Out
  OFF or 100 ms to 25.5s in 100 ms steps
Analog output
  (Included with GPIB option only) 0 to 4.98V in 20 mV
  steps, derived from three consecutive digits selected
  from the measurement result
Display Backlight
  On/off
Interfacing
GPIB: IEE-488.2, SCPI protocol
Power Requirements
AC: 90 to 265 Vrms, 45 to 440 Hz Max 30 W
DC: (PM9623 Option) Internal Battery or external 12 to
  24 Vdc, max 2A
Safety
  According to CE-regulation 73/23 EN61010-1 CAT II,
  Pollution Degree 2
EMC
  According to CE regulation 89/336:
  Emission according to EN 50081-1, EN 55011
  Immunity according to EN 50082-1, inclusive IEC 801-2,
  -3, -4
General Specifications
Interfacing
GPIB: IEE-488.2, SCPI protocol
Power Requirements
AC: 90 to 265 Vrms, 45 to 440 Hz Max 30 W
DC: (PM9623 Option) Internal Battery or external 12 to 24 Vdc, max 2A
Safety
  CSA 22.2 No. 101-1,
  EN61010-1 (1997), CAT II, Polution degree 2
EMC
  EN61326/A1 (1998)
Mechanical Data
Size
  210 mm (8.25 in) Wide X 86 mm (3.4 in)
  Height X 395 mm (15.6 in) Depth
Rackmount Height: 2HE
Weight
  3.2 kg (7 lb) excl. options




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