xii Specifications
Signal Inputs
Number of Inputs
2
Full Scale Input Range
-50 dBV (3.16 mVpk) to +34 dBV (50 Vpk) in 2 dB steps.
Maximum Input Level
57 Vpk
Input Configuration
Single-ended (A) or True Differential (A-B).
Input Impedance
1 M
Ω
+ 50 pF
Shield to Chassis
Floating Mode:
1 M
Ω
+
0.01
µ
F
Grounded
Mode:
50
Ω
Shields are always grounded in differential input (A-B).
Maximum Shield Voltage
4 Vpk
AC Coupling
-3 dB rolloff at 0.16 Hz.
CMRR
90 dB at 1 kHz (Input Range < 0 dBV).
80 dB at 1 kHz (Input Range <10 dBV).
50 dB at 1 kHz (Input Range
≥
10 dBV).
ICP Signal Conditioning
Current Source:
4.8 mA
Open Circuit Voltage
+26 V
A-weight Filter
ANSI Standard S1.4-1983; 10 Hz to 25.6 kHz,
Type 0 Tolerance.
Crosstalk
<-145 dB below signal,
(Input to Input and Source to Inputs, 50
Ω
receiving input
source
impedance).
Input Noise
<10 nVrms/
√
Hz (< -160 dBVrms/
√
Hz) above 200 Hz.
Trigger Input
Modes
Continuous, Internal, External, or External TTL.
Internal
Level adjustable to ±100% of input scale.
Positive or Negative slope.
Minimum Trigger Amplitude: 5% of input range
External
Level adjustable to ±5V in 40 mV steps.
Positive or Negative slope.
Input Impedance: 1 M
Ω
Max Input: ±5V
Minimum Trigger Amplitude: 100 mV
External TTL
Requires TTL level to trigger (low<0.7V, high>3.0V).
Post-Trigger
Measurement record is delayed up to 100,000 samples after
the trigger.
Pre-Trigger
Measurement record starts up to 8000 samples prior to the
trigger.
Tachometer Input
Modes
External, or External TTL.
External
Level adjustable to ±5V in 4 mV steps.
or ±25V in 20 mV steps.
Positive or Negative slope.
Time Capture
Mode
Continuous real time data recording to memory.
Maximum Rate
262,144 samples/sec for both inputs.
Lower rates may be used for longer capture.
Summary of Contents for SR785
Page 4: ...ii ...
Page 10: ...viii ...
Page 80: ...1 64 Exceedance Statistics ...
Page 158: ...2 78 Curve Fitting and Synthesis SR785 Dynamic Signal Analyzer ...
Page 536: ...5 136 Example Program SR785 Dynamic Signal Analyzer ...