Stanford Research Systems SR570 User Manual page 8

Specifications
Input
Input
Input Impedance
Input Offset
Maximum Input
Noise
Sensitivity
Frequency Response
Grounding
Filters
Signal Filters
Filter Reset
Gain Allocation
Low Noise
High Bandwidth
Low Drift
Output
Gain Accuracy
DC Drift
Maximum Output
Slew Rate Limit
Rear Panel
Interface
RS-232
External Gating
General
Operating Temperatures
Power
Dimensions
Weight
Warranty
Virtual null or user set bias voltage (-5V to +5V).
See Table 1
±1 pA to ±5 mA full scale adjustable dc offset current.
±5 mA.
See graphs on next page.
1 pA/V to 1 mA/V in a 1-2-5 sequence. Vernier sensitivity in 1%
steps.
Flat to ±0.5 dB up to 1 MHz (1 mA/V sensitivity ). Frequency response
can be adjusted from the front panel to compensate for the effects of
source capacitance at the input.
Amplifier ground is fully floating. Amplifier and chassis grounds may be
connected together at rear panel banana plug connectors.
Two configurable (low or high pass) filters: 6 or 12 dB/octave. The -3 dB
point of each filter is settable in a 1-3-10 sequence from 0.03 Hz to 1 MHz
for lowpass filters and 0.03 Hz to 10 kHz for highpass filters.
Long time constant filters may be reset with a front panel button.
Most of the gain is allocated in the front end of the instrument to decrease
the magnitude of Johnson noise at the output.
Front-end gain is reduced to increase the amplifier's frequency response.
A very low input bias current amplifier is used for more accurate
measurements on the higher sensitivity ranges.
±(0.5 % of output + 10 mV [50 mV High BW]) @ 25°C [100 pA/V - 1
mA/V sensitivities]
See Table 1
±5 V into a high impedance load (50W output impedance).
2 V peak to peak at 1 MHz.
±12 VDC @200 mA, referenced to amplifier ground.
Listen only, 9600 Baud DCE, 8 bit, no parity, 2 stop bits. All instrument
functions may be controlled. PC compatible serial connector. Optically
isolated.
TTL inputs to set gain to zero (blanking) or to invert gain polarity
(toggling).
0 to 50° C
100, 120, 220 or 240 VAC, 50/60 Hz from line. Internal batteries provide
up to 15 hours between charges. Batteries are charged while connected to
the line. Line power required is 30 watts while batteries are charging and 6
watts once fully charged.
8.3" x 3.5" x 13.0". Rack mounting hardware available.
15 lbs. (including batteries).
1 year.
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