Krohn-Hite DCA10

The Krohn-Hite DCA10 is a direct-coupled power amplifier engineered for precise DC and AC signal amplification across wide frequency ranges. It delivers 10 V·A (20 V·A peaks) continuous from DC to 500 kHz into 1,000 Ω, and 10 W (20 W peaks) continuous from 1 Hz to 1 MHz into 600 Ω. The amplifier operates at full power output up to 50°C ambient temperature, making it ideal for calibration, metrology, and precision measurement environments.

Technical Specifications Power Output & Voltage

10 V·A (20 V·A peaks) continuous, DC to 500 kHz into 1,000 Ω load

10 W (20 W peaks) continuous, 1 Hz to 1 MHz into 600 Ω load

20 W continuously at DC

Open-circuit output exceeds 105 V RMS (300 V peak-to-peak) DC to 1 MHz

100 V RMS (280 V peak-to-peak) across 1,000 Ω, DC to 500 kHz

78 V RMS (218 V peak-to-peak) across 600 Ω, 1 Hz to 1 MHz Output Current

Greater than 210 mA RMS (±300 mA peak) through 10 Ω above 1 Hz

130 mA RMS (±180 mA peak) through 600 Ω

100 mA RMS (±140 mA peak) through 1,000 Ω

42 mA RMS (±60 mA peak) through 10 Ω below 1 Hz

52 mA RMS through 1,000 Ω below 1 Hz Gain & Input Sensitivity

Continuously variable gain to maximum of 10

Fixed gain of 10 (±10%, 20 ±1 dB) with no phase reversal; fixed gain of 1 (±10%, 0 ±1 dB) with phase reversal

7.8 V RMS (600 Ω load) or 10 V RMS (1,000 Ω load) for 10 W output at maximum gain Coupling & Output Control

Direct coupling and 1 Hz capacitor coupling on input

Direct coupled DC output terminals; AC output terminals capacitor coupled with approximately 25 Hz low cutoff (600 Ω load)

Output DC level adjustable via front panel control; nominal zero at AC terminals, ±0.02% stability per hour at fixed line voltage, ±0.2% typical for ±10% line voltage variation Frequency Response

DC to 500 kHz into 1,000 Ω; 1 Hz to 1 MHz into 600 Ω

Nominal 30 Hz to 500 kHz in two ranges: 30 Hz to 10 kHz and 10 kHz to 500 kHz Input Protection

Maximum 400 V DC component in AC-coupled fixed gain positions

Combined AC and DC input voltages limited to 2 W dissipation in 5,000 Ω GAIN potentiometer at variable gain positions

Key Features

Low distortion across DC to 1 MHz bandwidth

Flat frequency response for accurate signal reproduction

Switchable input coupling (direct or AC)

Independent DC and AC output terminals

Front panel gain and DC offset adjustment

Typical Applications Precision calibration labs, metrology instruments, research signal conditioning, impedance matching networks, transducer amplification.