The Agilent 6825A power supply/amplifier is a general-purpose instrument, useful in laboratories engaged in research and development of electronic systems, circuitry, or components. The 6825A can be operated as a power supply or as an amplifier. Terminals on the rear terminal strip permit access to various internal control points to further expand the operational capabilities of the supply. The 6825A can be made to function as a regulated dc power supply by setting the front panel Mode switch to the Power Supply position. The supply can provide either a constant voltage output or constant current output. The dc output is bipolar and is continuously adjustable from its maximum rated positive value to an equal negative continously through zero. A crossover feature automatically changes the supply from constant voltage to constant current operation at a preset or programmed voltage/current point. The front panel Current Mode indicator lights for constant current operation. Both the supply and the load are protected against overvoltage and overcurrent conditions by internal circuits. Dual output voltage ranges are provided for better resolution. The front panel Range switch allows selection of the high or low output range. The output voltage can be programmed locally using the front panel Voltage control, or remotely by means of a resistance connected to the appropriate rear terminals. The output current can be programmed locally using the front panel Current control, or remotely by means of a resistance or voltage source connected to the appropriate rear terminals. The 6825A can be programmed at a very high speed (<50 µs for output voltage change over the entire voltage span). The 6825A can sink up to 50% of the rated output current. The 6825A can function as a variable gain or fixed gain amplifier with the Mode switch set to the Var Gain Amp or Fxd Gain Amp position. When operating as an amplifier, the 6825A can amplify externally applied ac or dc signals. Variable gain can be controlled locally with the Voltage control, or remotely, and is accurate to 0.1%. The variable gain amplifier is non-inverting and has a frequency response from dc to 15 kHz. The fixed gain amplifier is inverting and has a frequency response from dc to 40 kHz. A voltmeter and an ammeter on the front panel of the 6825A monitor the ac or dc output voltage and current. The associated front panel Voltage Meter and Current Meter switches also provide dual range monitoring capability for better resolution. High-speed remote programming Overload protection Wideband selection Bipolar voltage Current sink or source (Sink current is limited to a value ranging linearly from 1 A @ 0 V to 1 A @ 20 V) Output ratings (0 - 55ÁC): -5 V to +5 V, äóï20 V to + 20 V; 0 to 2A both ranges Ripple and noise: CV: 10 mVrms, 30 mVp-p, CC: 5 mArms, 15 mAp-p Transient recovery: 100 µs, 20 mV Typical output voltage/current change that can be obtained using front panel controls (resolution) Voltage (x1 range): 10 mV Voltage (x4 range): 40 mV Current: 3 mA Supply may be floated at up to 300 V above ground Power amplifier output Voltage (x1 range): 10 Vp-p Voltage (x4 range): 40 Vp-p Current 2 Ap Voltage gain (high/low range) Fixed amplifier (inverting): 4 x (high range)/1 x (low range) Variable gain (non-inverting): 0.8 (high range)/0.2 (low range) Frequency response (+1, -3 dB): dc to 40 kHz fixed gain, dc to 15 kHz variable gain Typical input impedance: 10 k© Meters dc meter accuracy is ±3% of full scale ac meter accuracy is ±5% of full scale dc range: ±2.4 V, ±24 V / ±0.24 A, ±2.4 A ac range: 1.6 V, 16 Vrms / 0.16 Arms, 1.6 Arms Ten-turn output voltage control option
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