Tektronix NetTek YBT250, User Manual

Page: 263 / 338

Appendix A: Specifications
YBT250 Field Transmitter & Interference Tester User Manual
A- 3
Table A- 1: General characteristics (Cont.)
Timing Input Characteristics Description
Maximum Low Threshold 0.8 V
Minimum High Time 10 ns
Minimum Low Time 10 ns
Maximum Input Level without
Damage
±
5 V peak continuous
Coupling DC
Frequency Lock Range
±
10 ppm
Internal Time Base
Characteristics
Description
Error
±
0.5 ppm drift from 0
_
C to 50
_
C
±
1.0 ppm aging/year
Ten minute warm-up period required to meet accuracy
specification.
Users can connect the External Reference input to a
frequency source and obtain a user correction value.
This value will be used to correct time base errors in
measurements to the accuracy of the external reference.
The internal time base will continue to drift with
temperature and age as specified above.
Signal Path Characteristics Description
Phase Noise
≤
--70 dBc/Hz @ 20 kHz carrier offset
Table A- 2: Measurement characteristics
Measurement Description
Standards Supported See Table F--1 on page F--1.
External Attenuation User Selectable ON/OFF
Attenuation = --30 dB to +80 dB