HP 181A manual 227

Chapter 7 HP 53131A/132A Specifications

Measurement Specifications (Continued)

Measurement Specifications (Continued)

Time Interval

Measurement is specified over the full signal ranges7 of Channels 1 and 2.

Results Range:	–1 ns to 105 s
LSD:	53131A		53132A
	-------------------------------------------------------------------------------------------
	500 ps		150 ps
RMS Resolution:		tre2 s + Start Trigger Error2 + Stop Trigger Error2
tres	53131A		53132A
	-------------------------------------------------------------------------------------------
	750 ps		300 ps
Systematic Uncertainty:	±(Time Base Error × TI) ± Trigger Level Timing Error ± 1.5 ns Differential Channel Error (HP 53131A)
				± 900 ps Differential Channel Error (HP 53132A)

Time Interval Delay

After a Time Interval Measurement has begun by satisfying the trigger conditions on Channel 1, the instrument will wait for the user-entered delay time to elapse before the end-of-measurement trigger will be accepted on Channel 2. Please refer to Measurement Arming for additional information.

Frequency Ratio: Ch1⁄Ch2 Ch1⁄Ch3 Ch2⁄Ch1 Ch3⁄Ch1

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 2 or 3 to make a valid measurement, whichever is longer)

LSD:

Ratio

1⁄

:

---------------------

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

Ratio

1⁄

:

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

2

Ch2 Freq × Gate Time

3

Ch3 Freq × Gate Time

Ratio

2⁄

:

---------------------

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

Ratio

3⁄

:

--------------

-------Ch3-------------Freq--------------------------------

1

(Ch1 Freq)2 × Gate Time

1

(Ch1 Freq)2 × Gate Time

RMS Resolution:

Ratio

1⁄

:

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

Ratio

1⁄

:

-2----×---------1+ (Ch1 Freq × Ch3 Trigger Error)2----------------------------------------------------------------------------------------------

2

Ch2 Freq × Gate Time

3

Ch3 Freq × Gate Time

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

Ratio

2⁄

:

Ratio

3

:

2 × Ch3 Freq × 1 + (Ch1 Freq × Ch3 Trigger Error)2

1

(Ch1 Freq)

2

× Gate Time

⁄

--------------------------------------------------------------------

2-----------------------------------------------------------------------

1

(Ch1 Freq)

× Gate Time

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

7See Specifications for Pulse Width and Rise/Fall Time measurements for additional restrictions on signal timing characteristics.

7

Assembly-Level Service Guide 7-9