4285A

      The Agilent 4285A precision LCR meter has some data sheets.The complete Agilent Technologies 4285A specifications are listed below. These specifications are the performance standards or limits against which the instrument is tested. When shipped from the factory, the 4285A meets the specifications listed in this section. The specification test procedures are covered in Agilent 4285A Maintenance Manual (Agilent Part Number 04285-90030).Mathematical functions is the deviation and the percent of deviation of measurement values from a programmable reference value.Equivalent measurement circuit is Parallel and series.Ranging is Auto and manual (hold/up/down).Trigger is Internal, external, BUS (GPIB), and manual.Delay time of 4285A is programmable delay from the trigger command to the start of the measurement, 0 to 60.000 s in 1 ms steps.Measurement terminals is four-terminal pair.Test cable length is 0 m, 1 m, and 2 m selectable.Integration time is short, medium, and long selectable (refer to Supplemental Performance Characteristics, page 14,for the measurement time).Averaging is 1 to 256, programmable.Test Signal Frequency is 75 kHz to 30 MHz, 100 Hz solution.Frequency accuracy is ±0.01%.
      The Agilent 4285A has 2 signal modes.Normal-Program selected voltage or current at the measurement terminals when they are opened or shorted, respectively.Constant-Maintains selected voltage or current at the device under test (DUT) independent of changes in the 4285A's impedance.
      The Agilent 4285A has Measurement Accuracy.The measurement accuracy includes stability, temperature coefficient, linearity, repeatability, and calibration interpolation error. The measurement accuracy is specified when all of the following conditions are satisfied.First warm-up time: 30 minutes.Second test cable length: 0 m, 1 m (Agilent 16048A),or 2 m (Agilent 16048D). For the 1 m or 2 m cable length operation (with Agilent 16048A/D),CABLE CORRECTION has been performed.Third OPEN and SHORT corrections have been performed.Fourth the optimum measurement range is selected by matching the DUT's impedance to the effective measuring range shown in Figure 1-1 and Figure 1-2. (For example, if the DUT's impedance is 3 k and oscillator level is less than or equal to 1 V, the optimum range is the 500 range.).Fifth Measurement accuracy is specified at the following reference planes:Test frequency 1 MHz At the UNKNOWN terminals on the Agilent 4285A front panel or at the end of the standard test leads (Agilent 16048A/D).Test frequency 1.001 MHz At the 1-port terminal of the Agilent 16085B Terminal Adapter, which should be connected to the UNKNOWN terminals of the Agilent 4285A or to the end of the standard test leads (Agilent 16048A/D).