I. General Information & Unit-to-Unit Matching

️· Manufacturer: Frequency Devices (likely - implied by "D68 & DP68 Series")
️· Location/Contact: 25 Locust St, Haverhill, Massachusetts 01830; Tel: 800/252-7074; Email: sales@freqdev.com; Web Address: http://www.freqdev.com
️· Unit-to-Unit Matching: A critical note states: "Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot." This implies the filters are tested and matched in groups to ensure consistency.

II. Low-Pass Filters - 8-Pole (Details about specifications are fragmented, making complete interpretation difficult)

️· General Specs (assumed):
- Size/Dimensions: 1.8" x 0.8" x 0.3"
- Operating Temperature range: Not explicitly stated.
- Power Supply: Vs ± 15 Vdc (at 25°C)
️· Specification Table (partial, likely excerpt from a larger table):
- "Front View"
- "1.80" (likely a value related to a specification, but context is missing)

III. High-Pass Filters - 8-Pole (More detail available)

️· General Specs (assumed): Same size and operating conditions as mentioned above.
️· Filter Types and Specifications (Fragmented Table - multiple filters listed, with partial specifications):
- D68H8B (Butterworth):
■ Transfer Function (related to fc and fr - cutoff frequencies)
■ Attenuation Rate: 48 dB/octave
■ Signal Bandwidth: ~120 kHz (-6dB at 1 MHz)
■ Stopband: Specifications are given for frequency ranges (0 to 100 kHz, 120 kHz, etc.)
■ Ripple: Specified for different frequencies and conditions.
■ Amplitude/Gain: Specified with frequency.
■ Phase: Specified in degrees.
■ Harmonic Distortion: Specifications are given.
■ Noise: Specifications are given in mVrms.
- D68H8E, D68H8EX, D68H8EY (Elliptic): Similar specifications to the Butterworth, but likely with different performance characteristics (steeper roll-off). Values for the various specifications are different for each filter type.
️· Key Specification Parameters (across all high-pass filter types):
- Cutoff Frequency (fc)
- Fr (Frequency - likely related to a stopping frequency)
- Attenuation Rate (dB/octave)
- Phase (degrees)
- Noise (mVrms)
- Ripple (dB)
- Stopband characteristics (frequency ranges)

IV. Other Sections

️· Pin-Out and Package Data: A section mentioning pin-outs and package data, suggesting further detailed information on the physical connections and design of the filters is available elsewhere.
️· Ordering Information: Another section that indicates detailed product ordering information exists, likely including part numbers and pricing.
️· Summary: An incomplete summary statement appears at the very end.

Important Considerations and Limitations: