8

Chapter 8 HP 53181A Specifications

Measurement Specifications (Continued)

Measurement Specifications (Continued)

Frequency Ratio: Ch1Ch2

Ch2Ch1

Measurement is specified over the full signal range of each input.

Results Range:

10–10to 1011

‘Auto’ Gate Time:

100 ms (or sufficient cycles on Channel 1 to make a valid measurement, whichever is longer)

LSD:

 

 

Ratio 1

: ---------------------

--------1-----------------------------

2

Ch2 Freq × Gate Time

Ratio 2

: ---------------------

Ch2-------------Freq--------------------------------

1

(Ch1 Freq)2 × Gate Time

RMS Resolution:

 

Ratio 1

: -2----×---------1-----+-----(---Ch1------------Freq--------------×-----Ch2-------------Trigger--------------------Error--------------)--2-

2

 

Ch2 Freq × Gate Time

Ratio 2

: -2----×-----Ch2-------------Freq--------------×---------1-----+-----(--Ch1-------------Freq-------------×-----Ch2-------------Trigger---------------------Error-------------)---2

1

 

(Ch1 Freq)2 × Gate Time

To minimize relative phase measurement error, connect the higher frequency signal to Channel 1 when possible.

Peak Volts

Measurement is specified on Channels 1 for DC signals; or for AC signals of frequencies between 100 Hz and 30 MHz with peak-to-peak amplitude greater than 100 mV. (The measurement will continue to operate up to 225 MHz, though results are for indication only.)

Results Range:

–5.1 V to +5.1 V

Resolution:

10 mV

 

Systematic Uncertainty for AC signals:

25 mV + 10% of V

 

for DC signals:

25 mV + 2% of V

Use of the input attenuator multiplies all voltage specifications (input range, results range, resolution and systematic uncertainty) by a nominal factor of 10. For example with AC signals, the Systematic Uncertainty becomes: 250 mV + 10% of V.

8-8

Assembly-Level Service Guide

Page 242
Image 242
HP 181A manual Ratio 1 ⁄ Ch2 Freq × Gate Time Ratio 2 ⁄