Specifications - Stanford Research Systems SR844 User Manual

Specifications

Specifications apply after 30 minutes of warm-up. All specifications are with output filtering enabled (6,
12, 18 or 24 dB/oct) and 2F detection OFF, unless stated otherwise.
Voltage Input
Input Impedance
Damage Threshold
Bandwidth
Full Scale Sensitivity
Gain Accuracy
< 50 MHz
< 200 MHz
Gain Stability
Coherent Pickup
f < 10 MHz
f < 50 MHz
f < 200 MHz
Input Noise: 50 Ω Input
100 kHz < f < 100 MHz
25 kHz < f < 200 MHz
Input Noise: 1 M Ω Input
25 kHz < f < 200 MHz
Dynamic Reserve
External Reference Input
Impedance
Level
Pulse Width
Threshold Setting
Acquisition Time
Internal Reference Oscillator
Frequency Resolution
Frequency Accuracy
Phase Noise
Reference Outputs
Front Panel Ref Out
Rear Panel TTL Out
Harmonic Detect
Phase Resolution
Absolute Phase Error
< 50 MHz
< 100 MHz
< 200 MHz
Signal Input
single-ended BNC.
Ω Ω
50 or 1 M || 30 pF.
± 5 V (DC+AC)
25 kHz to 200 MHz.
100 nV to 1V rms in a 1-3-10 sequence.
± 0.25 dB
±
0.50 dB
0.2%/ ° C
Low Noise Wide Reserve, Sensitivity < 30 mV.
< 100 nV (typical)
< 2.5 µ V (typical)
µ
< 25 V (typical)
√
2 nV/ Hz (typical), < 4 nV/
< 5 nV/ √ Hz (typical), < 8 nV/
√
5 nV/ Hz (typical), < 8 nV/
> 60 dB (expand off)
Reference
25 kHz to 200 MHz.
50 Ω or 10 k Ω || 40 pF.
0.7 Vpp digital or 0 dBm sinusoidal signal.
> 2 ns at any frequency.
Automatic, set to midpoint of waveform extrema.
< 10 s (auto-ranging, any frequency).
< 1 s (within same octave).
25 kHz to 200 MHz.
3 digits.
± 0.1 in the 3rd digit.
-90 dBc/Hz at f=100 MHz,
Phase locked to either Internal or External reference.
25 kHz to 200 MHz square wave, 1.0 Vpp nominal into 50
25 kHz to 1.5 MHz, 0 to +5 V nominal, ≥ 3 V into 50
Detect at 50 kHz ≤ 2×Reference
0.02 °
°
< 2.5
< 5.0 °
< 10.0 °
√
Hz (max).
√ Hz (max).
√
Hz (max).
∆
f=100 Hz.
≤ 200 MHz.
SR844 RF Lock-In Amplifier
v
Ω .
Ω .