HP 132A User Manual download pdf (Page 16)

Chapter 1 Before You Start ...

Differences Between Prior and Current Revisions of the HP

53131A/132A

1-4 Programming Guide

Measurements

If your Counter contains other than the current firmware revision, the following

measurement capabilities are different:

• Ratio channel selections Ratio 2 to 1 and Ratio 3 to 1

(for those counters equipped with Channel 3) are not available.

• Ratio “AUTO-armed” does not automatically extends gate to capture

sufficient edges.

If Channel 1 input frequency is less than approximately 10 Hz, the Ratio

gate time is not extended to capture sufficient Channel 1 edges to produce

a valid measurement. Default gate time is 100 msec, which is not long

enough to capture two edges on a low-frequency signal. The user is

required to extend the gate by switching to TIME arming, and selecting a

gate time appropriately long.

• Sensitivity for firmware revision below does not have adjusted controls to

LO and MED sensitivity.

In some Counters that contained firmware revision 3317,

LO sensitivity fails to correctly count very high frequency signals.

Statistics

If your Counter contains other than the current firmware revision s, single-shot

statistics are not available using the ON SINGLE: menu item found in the

Statistics menu (use Stats key).

HP-IB Commands

[:SENSe]:EVENt[1|2}:HYSTeresis:RELative

If your Counter contains firmware revision s 3402 and below, the input hysteresis

command and query does not operate in the conventional way. That is,

[:SENSe]:EVENt[1|2]:HYSTeresis:RELative sets high sensitivity when the

parameter is MINimum or 0 percent, and sets low sensitivity when the parameter

is MAXimum or 100 percent.

In the prior firmware revisions (3317, 3335, or 3402), MINimum or 0 percent

corresponded to low sensitivity, and MAXimum or 100 percent corresponded to

high sensitivity.

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HP 132A User Manual Page 16