DESCRIPTION

The D1-25 Step Attenuator is a reference attenuator designed for testing and verification of measurement instrumentation in manufacturing environment.

The Instrument’s principle of operation is based on dividing dc and ac voltages by a precision resistor system, having low reactivity and high stability.

The D1-25 Step Attenuator provides 0 to 110 dB attenuation in 10-dB steps in 0–100 MHz operating frequency range.

The Instrument consists of a housing with attenuation sections and a switch with an indicator.

The coaxial input and output connectors are located in the housing, as well as additional «40 dB» and «80 dB» connectors for the Instrument’s verification.

N-type connector with cross-section of 7.0/3.04 mm, female, IEC STD 169-16.

SPECIFICATIONS

Frequency range: DC – 100 MHz

Dynamic attenuation range (in 10-dB steps): 0 to 110 dB

Basic differential attenuation error relative to zero mark at dc: ±(0.002 + 0.0002А) dB, where A is a differential attenuation

Permissible basic accuracy range in 0 to 30 MHz range:

±(0.004+a·f2) dB – for 10 dB differential attenuation relative to zero mark;

±(0.002+0.0002·А10+b·А10·f2) dB – for any differential attenuation value А10 dB, where a=0.0004 dB/MHz2, b=1·10–5 MHz–2, f – frequency in MHz.

Permissible basic accuracy of differential attenuation in 30 MHz to 100 MHz frequency range:

±(0.004+c·f), dB – for 10 dB differential attenuation relative to zero mark;

±(0.002+0.0002·А10+d·А10·f), dB – for any differential attenuation value А10, dB, relative to 10 dB mark, where c=0.012 dB/MHz, d=0.0003 MHz–1, f – frequency in MHz

DC input resistance: not more than 50±0.1 Ohm

DC output resistance (at any attenuation switch position into 50±0,1 Ohm load connected to the input): not more than 25±0.1 Ohm

Maximal dc or ac voltage applied to the input: not more than 3V

MTBF: not less than 30000 hours

Number of switching cycles from 0 to 110 dB: not less than 30 000

Dimensions: 149х149х95 mm.

GENERAL

Operating temperature range: 5–40 ^оС (non-operating temperature range –50 to 50 ºС)

Relative humidity at 25 ^оС: up to 98 %

Atmospheric pressure: 70 to 106.7 kPa