Fluke PM6685R / 776 Universal Frequency Counter / Calibrator. Rubidium Timebase, 4.5 GHz C Channel, GPIB
Fluke Frequency Counters. Resolution: 10 digits per second, Sensitivity: 10 mV rms to 10 V rms (variable).
- Model
- Fluke PM6685R / 776
- Calibration
- Available on request
- Price
- $2,279
- Status
- In stock
- RFQ ref
- PM6685R / 776
This unit
The Fluke PM6685R / 776 is a universal frequency counter and calibrator built around a rubidium atomic timebase for precision measurement and calibration work. It delivers 10 digits per second measurement speed across Input A (10 Hz to 300 MHz) and an extended C channel reaching 4.5 GHz with optional modules. The rubidium reference provides exceptional short-term stability of < 2.5 × 10⁻¹¹ (Root Allan Variance) and long-term aging of 1 × 10⁻⁹ per 10 years, locking within 5 minutes to operational specification.
Technical Specifications Timebase & Reference
Rubidium atomic reference with 10 MHz buffered output
Short-term stability: < 2.5 × 10⁻¹¹ (Root Allan Variance)
Stability within 10 minutes: 4 × 10⁻¹⁰
Aging rate: 1 × 10⁻⁹ per 10 years or 2 × 10⁻¹⁰ per year
Warm-up to lock: approximately 5 minutes
Warm-up to 5 × 10⁻⁹ of final value: 10 minutes Frequency Measurement
Input A range: 10 Hz to 300 MHz
Input C range: 4.5 GHz (with applicable option)
Burst frequency A range: 100 Hz to 80 MHz
Measurement resolution: 10 digits per second
Display capability: 11th and 12th digits on overflow
Period, ratio (A/E, C/A), pulse width, duty factor, and event totalization functions Input Specifications
Input impedance: 1 MΩ // 25 pF or 50 Ω (VSWR < 2:1)
Manual trigger sensitivity: 10 mV rms to 10 V rms (variable)
Trigger slope: positive or negative selection
Low pass filter: 100 kHz nominal 3 dB point
Auto trigger with intelligent input optimization
Input A damage level: 350 V (DC + AC peak) at 1 MΩ Display & Control
Analog bar graph indicator for input level or sensitivity
Digit blanking function available
Nulling capability for reference-based measurements
Key Features
Intelligent AUTO trigger mode eliminates manual setup iterations
Rubidium timebase enables calibration of any application-specific frequency standard
Extended C-channel frequency coverage to 4.5 GHz
10 digits per second measurement throughput
Typical Applications Frequency calibration and verification, precision frequency analysis, frequency standard characterization, automated test integration in calibration laboratories and metrology environments.
Compatibility & Integration IEEE-488 (GPIB / SCPI) optional interface with front-panel-readable, rear-panel-selectable GPIB address assignment.
Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 10 Hz to 300 MHz (Input A) |
| 4.5 GHz (Input C with option) | Voltage / Current Range | 10 mV rms to 10 V rms (trigger sensitivity) |
Fluke PM6685R / 776 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Fluke PM6685R / 776. All calibrations are performed to NIST-traceable standards and ship with a certificate. Turnaround is typically 1–3 business days after receipt.
Fluke PM6685R / 776 price
This Fluke PM6685R / 776 is listed at $2,279. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Fluke PM6685R / 776 calibration cost
NIST-traceable calibration for the Fluke PM6685R / 776 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Turnaround is 1 to 3 business days after receipt. See full calibration details →
