# HP 35677A 50 Ohm S-Parameter Test Set (Pre-Owned) # HP 35677A 50 Ohm S-Parameter Test Set (Pre-Owned) ## Key Features At A Glance - Frequency range 100 kHz to 200 MHz for transmission and reflection measurements in both forward and reverse directions - Test port impedance of 50Ω (35677A) or 75Ω (35677B) for matched-system measurements - Directivity greater than 40 dB - Test port isolation greater than 100 dB - Integrated test set design eliminates the need to change device connections for reverse measurements - Operates with the HP 3577A Network Analyzer, which controls switching functions - RF input damage level of +27 dBm or ±30 Vdc; maximum operating level of +25 dBm or ±30 Vdc - Ships with four 7.5 in. 50Ω cables, test set interconnect cable, rear panel lock foot kit, and service manual The HP 35677A and HP 35677B are S-parameter test sets that operate from 100 kHz to 200 MHz. The HP 35677A is configured for 50Ω systems and the HP 35677B is configured for 75Ω systems. Each unit contains the hardware required to make transmission and reflection measurements in both the forward and reverse directions, presenting the device under test through two measurement ports. These test sets are designed to be used with the HP 3577A Network Analyzer, which controls the switching functions of the test set so that forward and reverse measurements can be performed without changing device connections. Rather than constructing a test setup from discrete RF components such as power dividers, directional bridges, cables, and pads, an engineer can connect the device under test to the integrated test set and let the HP 3577A coordinate the measurement. ValueTronics International, LLC has specialized in new and used test and measurement equipment since 1992. All inventory is stored, inspected, and functionally tested in our 20,000 sq ft secure warehouse at 1675 Cambridge Drive, Elgin, Illinois. That facility-based testing model is what allows us to grade legacy network analysis hardware such as the HP 35677A and the HP 35676A test kits with confidence, rather than passing through unverified units from external sources. When you order a vintage HP test set from ValueTronics, the unit has been handled, evaluated, and prepared for shipment by our own staff. ## Brand Heritage Hewlett-Packard's test and measurement business was spun off as Agilent Technologies in 1999, and Agilent's electronic measurement business was subsequently transferred to Keysight Technologies in 2014. Instruments originally branded HP, including the HP 35677A/B and HP 35676A/B, therefore trace through the Agilent and Keysight lineage for any historical product references. ## Compare Other Models in This Series This product family covers two related groups of network analysis accessories designed to operate with the HP 3577A Network Analyzer. The HP 35677A/B S-Parameter Test Sets cover 100 kHz to 200 MHz with integrated forward and reverse measurement paths through two test ports. The HP 35676A/B Reflection/Transmission Test Kits extend the lower frequency range to 5 Hz and provide reflection, transmission, and impedance measurement capability through a precision resistive divider and a set of calibration accessories. Within each pair, the A version supports 50Ω systems and the B version supports 75Ω systems. Customers select between them based on the characteristic impedance of the system under test rather than on a difference in feature set, so this comparison is fundamentally about matching the test accessory to the impedance environment in use. Each pre-owned model linked below is listed on its own product page with condition-matched pricing and condition-specific information. Pricing, included accessories, and availability reflect the configuration of the specific unit in inventory for that model. The HP 35677A is the 50Ω S-parameter test set in this group. It is configured with 50Ω test ports and is the appropriate choice when the device under test and the rest of the measurement chain are also in a 50Ω environment, which is the most common impedance choice for general RF work in this frequency range. The most significant difference between the HP 35677A and HP 35677B is the test port impedance: 50Ω on the HP 35677A and 75Ω on the HP 35677B. Specifications also vary in a few related parameters. Test port match is greater than 26 dB on the HP 35677A and greater than 24 dB on the HP 35677B. Insertion loss from RF input to test port 1 or 2 is typically 13 dB on the HP 35677A and 19 dB on the HP 35677B, and insertion loss from RF input to output ports A, B, or R is typically 19 dB on the HP 35677A and 31 dB on the HP 35677B. Between the HP 35676A and HP 35676B reflection/transmission test kits, the impedance distinction is again the primary difference: 50 ± 2% (HP 35676A) versus 75 ± 2% (HP 35676B). Equivalent source match is 30 dB typical on the HP 35676A and 25 dB typical on the HP 35676B. Other operating characteristics — frequency range of 5 Hz to 200 MHz, insertion loss of 10 ± 1 dB typical, and equivalent directivity of 40 dB typical — are common to both versions. The comparison table that follows summarizes the specifications side by side. Model Type Frequency Range Test Port Impedance **35677A** S-Parameter Test Set 100 kHz to 200 MHz 50 Ohm 35677B S-Parameter Test Set 100 kHz to 200 MHz 75 Ohm 35676A Reflection/Transmission Test Kit 5 Hz to 200 MHz 50 Ohm ± 2% typical 35676B Reflection/Transmission Test Kit 5 Hz to 200 MHz 75 Ohm ± 2% typical Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - 4 ea. 190 mm (7.5 in.) 50 Ohm cables with Type N male connectors for connection to HP 3577A (HP Part No. 8120-4387) - 1 ea. Test Set interconnect cable to HP 3577A (HP Part No. 35677-61620) - 1 ea. Rear Panel Lock Foot Kit (HP Part No. 5061-0099) - 1 ea. Service Manual (HP Part No. 35677-90010) ## Product Core & Specifications Specification Value Frequency Range 100 kHz to 200 MHz Test Port Impedance 50 Ohm Directivity \>40 dB Frequency Response - Transmission (S21, S12) ±1 dB, ±5 degrees Frequency Response - Reflection (S11, S22) ±1 dB, ±5 degrees Test Port Match (Ports 1, 2) \>26 dB Test Ports 1, 2 Open/Short Ratio <±0.75 dB magnitude and <±5 degrees phase Input Port Match \>20 dB return loss Output Ports A, B, and R Match \>26 dB return loss Test Port Isolation \>100 dB Insertion Loss - RF Input to Test Port 1 or 2 Typically 13 dB Insertion Loss - RF Input to Output Ports A, B, or R Typically 19 dB Test Port Reciprocity - Transmission (S21, S22) Typically <±0.5 dB magnitude and <±5 degrees phase Test Port Reciprocity - Reflection (S11, S22) Typically <±0.5 dB magnitude and <±5 degrees phase Incident Power Ratio (Test Port 1 to Test Port 2) Typically <±1.5 dB RF Input Maximum Operating Level +25 dBm or ±30 Vdc RF Input Damage Level ±27 dBm or ±30 Vdc Port 1 or 2 Damage Level +27 dBm or ±30 Vdc Input Port and Output Ports A, B, and R Connectors 50 Ohm Type N female Test Ports 1 and 2 Connectors 50 Ohm Type N female DC Bias Inputs BNC female, rear panel DC Bias Range Typically ±30 Vdc and ±20 mA with some degradation of RF specifications; 200 mA damage level Power All power obtained through the HP 3577A interconnect cable Weight 6 kg (13 lb) net; 12 kg (25 lb) shipping Dimensions 90 mm H x 425 mm W x 584 mm D (3.5 in. x 16.75 in. x 22.75 in.). Add 1 1/8 inch to depth to include front panel connectors. **Important:** RF Input Damage Level: +27 dBm or ±30 Vdc. Port 1 or 2 Damage Level: +27 dBm or ±30 Vdc. Maximum operating level: +25 dBm or ±30 Vdc.**Important:** The HP 35677A/B S-Parameter Test Sets and HP 35676A/B Reflection/Transmission Test Kits are designed for use with the HP 3577A Network Analyzer. The HP 35677A/B receives all power through the HP 3577A interconnect cable.**Important:** HP 35676A/B operating characteristics are typical, assuming proper calibration with accessories supplied.Recommended pairing: the HP 35677A/B S-Parameter Test Set is designed for use with the HP 3577A Network Analyzer, which controls the test set's switching functions. The supplied test set interconnect cable (HP Part No. 35677-61620) connects the two instruments. ## About this used unit - Warranty included. - Functional verification included. - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - **Vendor:** HP - **Type:** Test Set - **Tags:** Agilent, Agilent Keysight, Manufacturers, Other Equipment, product_manual_group_1, Product_used, Test Set ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 0.00 USD | In stock | ## Images - 35677A Agilent Test Set --- > Source: [ValueTronics](https://valuetronics.com/products/35677a-agilent-test-set-used) > Updated: 2026-05-30