# CMC251 Tektronix Frequency Counter Used

**Features:**

-   1 Hz to 100 MHz (CH 1), 80 MHz to 1.3 GHz (CH 2)
-   ±1 ppm Time Base
-   Period Average, Period, Frequency, Totalize Self-test
-   Display Hold
-   Remote Start/Stop

**Applications:**

-   Training
-   Manufacturing
-   Production Test
-   Field Repair
-   Bench Calibration and Repair
-   Product Design
-   Laboratory and Research
-   Education

The Tektronix CMC251, 1.3 GHz Multifunction Counter, measures the frequency of sine, square and triangle waves from 1 Hz to 1.3 GHz. The CMC251 also provides period, totalize and pulse width measurements.

The counter has two input channels. Channel A is a standard 1 MΩ input for frequency measurements up to 100 MHz. Channel B is a 50 Ω terminated input for use in high-frequency systems.

This counter is of interest to radio amateurs because of its ability to measure high-frequency systems. The temperature-compensated, crystal-controlled time base is stable to ±1 part per million per year.

## Details

- **Price:** 0.0 USD - 300.0 USD
- **Vendor:** Tektronix
- **Type:** Freq Coun
- **Tags:** Frequency Counter, Manufacturers, Other Equipment, product_manual_group_1, Product_used, Tektronix

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 0.00 USD | In stock |
| NIST Traceable | 225.00 USD | In stock |
| NIST Traceable with Full Data | 262.50 USD | In stock |
| ISO IEC 17025 Accredited | 300.00 USD | In stock |

## Images

- CMC251 Tektronix Frequency Counter

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> Source: [ValueTronics](https://valuetronics.com/products/cmc251-tektronix-frequency-counter-used)
> Updated: 2026-05-21