SIGNAL CHANNEL Voltage Inputs Single-ended (A) or differential (A-B). Current Input 106 or 108 Volts/Amp. Full Scale Sensitivity 2 nV to 1 V in a 1-2-5-10 sequence (expand off). Input Impedance Voltage: 10 M½+25 pF, AC or DC coupled. Current: 1 k½ to virtual ground. Gain Accuracy ±1% from 20°C to 30°C (notch filters off). Input Noise 6 nV/ÃHz at 1 kHz (typical). Signal Filters 60 (50) Hz and 120(100) Hz notch filters (Q=4). CMRR 90 dB at 100 Hz (DC Coupled). Dynamic Reserve Greater than 100 dB (with no signal filters). Harmonic Distortion <-90 dB to 10 kHz, <-80 dB to 100 kHz. REFERENCE CHANNEL Frequency Range 1 mHz to 102 kHz Reference Input TTL (rising or falling edge) or Sine. Sine input is1 M½, AC coupled (>1 Hz). 400 mV pk-pk minimum signal. Phase Resolution 0.001° Absolute Phase Error <1° Relative Phase Error <0.001° Orthogonality 90° ± 0.001° Phase Noise External synthesized reference: 0.005° rms at 1 kHz, 100 ms, 12 dB/oct. Internal reference: crystal synthesized, <0.0001° rms at 1 kHz. Phase Drift <0.01°/°C below 10 kHz <0.1°/°C to 100 kHz Harmonic Detect Detect at Nxf where N<32767 and Nxf<102 kHz. Acquisition Time (2 cycles + 5 ms) or 40 ms, whichever is greater. DEMODULATOR Zero Stability Digital displays have no zero drift on all dynamic reserves. Analog outputs: <5 ppm/°C for all dynamic reserves. Time Constants 10 μs to 30 s (reference > 200 Hz). 6, 12, 18, 24 dB/oct rolloff. up to 30000 s (reference < 200 Hz). 6, 12, 18, 24 dB/oct rolloff. Synchronous filtering available below 200 Hz. Harmonic Rejection -90 dB INTERNAL OSCILLATOR Frequency 1 mHz to 102 kHz. Frequency Accuracy 25 ppm + 30 μHz Frequency Resolution 5 digits or 0.1 mHz, whichever is greater. Frequency Sweeps Linear and Log. Distortion f<10 kHz, below -80 dBc. f>10 kHz, below -70 dBc.1 Vrms amplitude. Output Impedance 5 0 ½ Amplitude 4 mVrms to 5 Vrms (into a high impedance load) with 2 mV resolution. (2 mVrms to 2.5 Vrms into 50½ load). Amplitude Accuracy 1% Amplitude Stability 50 ppm/°C Outputs Sine output on front panel. TTL sync output on rear panel. When using an external reference, both outputs are phase locked to the external reference. INPUTS AND OUTPUTS Channel 1 Output X, R, q, or Trace 1-4. Traces are defined as A•B/C or A•B/C2 where A, B, and C are selected from the quantities Unity, X, Y, R, q, Xnoise, Ynoise, Rnoise, Aux Inputs 1 through 4, or Frequency. Output Voltage: ±10 V full scale. 10 mA max output current. Channel 2 Output Y, R, q, or Trace 1-4. Traces are defined as A•B/C or A•B/C2 where A, B, and C are selected from the quantities Unity, X, Y, R, q, Xnoise, Ynoise, Rnoise, Aux Inputs 1 through 4, or Frequency. Output Voltage: ±10 V full scale. 10 mA max output current. X and Y Outputs Rear panel outputs of cosine (X) and sine (Y) components. Output Voltage: ±10 V. 10 mA max output current. Aux. Outputs 4 BNC Digital to Analog outputs. ±10 V full scale, 1 mV resolution. May be set to a fixed voltage or swept in amplitude (linear or log). 10 mA max output current. Aux. Inputs 4 BNC Analog to Digital inputs. Differential inputs with1 M½ input impedance on both shield and center conductor. ±10 V full scale, 1 mV resolution. Trigger Input TTL trigger input triggers each data sample and/or start of scan. Monitor Output Analog output of signal amplifiers (before the demodulator). DISPLAYS Screen Format Single or dual display. Displayed Quantities Each display may show one of the traces. Traces are defined as A•B/C or A•B/C2 where A, B and C are selected from the quantities Unity, X, Y, R, q, Xnoise, Ynoise, Rnoise, Aux Inputs 1 through 4, or Frequency. Display Types Large numeric readout with bar graph, polar graph, and strip chart. Chart Data Buffer 64k data points may be stored and displayed on strip charts. The buffer can be configured as a single trace with 64k points, 2 traces with 32k points each, or 4 traces with16k points each. The internal data sample rate ranges from 512 Hz down to 1 point every 16 seconds. Samples can also be triggered. ANALYSIS FUNCTIONS Smoothing 5 - 25 point Savitsky-Golay smoothing of trace regions. Curve Fits Line, Exponential, and Gaussian fits of trace regions. Calculator Arithmetic, trigonometric, and logarithmic calculations on trace regions. Statistics Mean and standard deviation of trace regions. GENERAL Monitor Monochrome CRT. 640H by 480V resolution. Adjustable brightness and screen position. Interfaces IEEE-488, RS232 and Printer interfaces standard. All instrument functions can be controlled through the IEEE-488 and RS232 interfaces. A PC keyboard input is provided for additional flexibility. Preamp Power Power connector for SR550 and SR552 preamplifiers. Hardcopy Screen dumps to dot matrix and HP LaserJet compatible printers. Data plots to HP-GL compatible plotters (via RS232 or IEEE-488). Screens can also be saved to disk as PCX image files. Disk 3.5 inch DOS compatible format, 720 kbyte capacity. Storage of data and setups. Power 60 Watts, 100/120/220/240 VAC, 50/60 Hz. Dimensions 17"W x 6.25"H x 19.5"D Weight 40 lbs. Warranty One year parts and labor on materials and workmanship.