Stanford Research Systems SR844 User Manual page 8

vi Specifications
Relative Phase Error,
Orthogonality
Phase Noise
Phase Drift
< 10 MHz
< 100 MHz
< 200 MHz
Zero Stability
Filtering
Time Constants
None
Harmonic Rejection
Odd Harmonics
Other Harmonics and
Sub-harmonics
Spurious Responses
Type 4½ digit LED
Displayed X
Quantities R [Volts]
R [dBm]
X-noise
AUX IN 1
Ratio The signal may be ratioed with respect to AUX IN 1 or
2. The ratio is applied to both X and Y before
computation of R, R[dBm], X-noise, Y-noise [V, dBm]
and so affects all of these quantities. The ratio input is
normalized to 1 V and has a dynamic range > 100.
Expand The CH1 and CH2 displays and outputs may be
expanded by ×10 or ×100.
SR844 RF Lock-In Amplifier
Reference
°
< 2.5
°
0.005 rms at 100 MHz, 100 ms time constant.
< 0.1 ° / ° C
° °
< 0.25 / C
< 0.5 ° / ° C
Demodulator
Digital displays have no zero drift.
Analog outputs have < 5ppm/
100 µ s to 30 ks with 6, 12, 18 or 24 dB/octave roll-off.
µ
10 to 20 s update rate (X and Y outputs), 60
-10 dBc @ 3×Ref, -14 dBc @ 5×Ref, etc.
< -40 dBc
-10 dBc @ Ref ± 2×IF
-23 dBc @ Ref ± 4×IF
< -30 dBc otherwise.
Displays
Channel 1
4½ digit LED
Y
θ
[degrees]
Y-noise [Volts]
Y-noise [dBm]
AUX IN 2
° C drift for all dynamic reserve settings.
Channel 2
4½ digit LED
Reference Frequency
Reference Phase
Aux Output Voltages
Offsets in % of Full Scale
IF Frequency
Elapsed Settling Time
µ θ
s (R and outputs).
Reference