Stanford Research Systems SR620, Руководство пользователя

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viii Specifications
SR620 Universal Time Interval Counter
Gate 0.01 seconds (1 period min.) for period measurement and 1 sample for time
interval measurement. Period may also be measured using externally
triggered internal gates as in frequency mode.
Error < ±(1ns x Frequency x 360 + 0.001) degree
Events
Range 10
12
. RATIO A/B range: 10
-9
to 10
3
Count Rate 0 to 300 MHz
Gates Same as frequency
Display 12 digits
Timebase
Standard Option/01
Frequency 10.000 MHz 10.000 MHz
Type TCVCXO Ovenized VCXO
Aging 1x10
-6
/yr 1x10
-9
/day
Allan Variance (1s)(typ.) 3x10
-10
5x10
-11
Stability 0-50° C 1 ppm 0.005 ppm
Settability 0.01 ppm 0.001 ppm
External User may supply 5 or 10 MHz timebase. 1 Volt nominal.
Inputs A, B, and EXTernal
Threshold -5.00 to +5.00 VDC with 10 mV resolution
Accuracy 15mV + 0.5% of setting
Sensitivity see graph next page
Autolevel (A&B) Threshold set between peak input excursions. (f>10 Hz, duty cycle >10
-6
)
Slope Rising or falling edge
Impedance (1 M Ohm + 30 pf) or 50 Ohms. 50 Ohm termination has SWR < 2.5:1 from
0 -1.3GHz
Coupling AC or DC. Ext is always DC coupled.
Input Noise 350mV rms typical
Bandwidth 300 MHz BW provides 1.2 ns risetime
Prescaler (A&B) see graph next page
Protection 100 V. 50 Ohm terminator is released if input exceeds ±5 Vpeak.
REF Output Calibration and Trigger source
Frequency 1.00 KHz (Accuracy same as timebase)
Rise/Fall 2 ns
Amplitude TTL: 0 to 4 VDC (2 VDC into 50 Ohms)
ECL: -1.8 to -0.8 VDC into 50 Ohms
DVM Inputs Two differential rear panel DVM inputs
Full Scale ±1.999 or ±19.99 VDC
Type Sample & hold with successive approximation converter
Impedance 1 M Ohm
Accuracy 0.3% of full scale
Speed Formatted response in approximately 5 ms.
D/A Outputs Two rear panel outputs which may be ramped
Full Scale ±10.00 VDC
Resolution 5 mV
Impedance < 1 Ohm