HP 5335A - Page 23

Operation and Programming
3-47. Gate/Cycle Group
3-48. The GATE ADJ control sets the length of the gate time,
continuously adjustable through the ranges set by the GATE
MODE keys. In certain time interval functions (i.e., TIME A—B,
1/TIME, PULSE), the actual gate time is automatically deter¬
mined, dependent on the input signal. In these modes, the gate
time controlled by GATE ADJ, can be used as a Hold-Off Delay
for the Stop channel. If a T.l. DELAY mode is selected (any GATE
MODE except MIN) the red T.l. DELAY indicator will light. In
these functions, the normal operation gate mode is MIN if no
delay is desired. For more information about the GATE ADJ
control during time domain measurements, refer to TIME A -*B,
paragraph 3-102.
GATE ADJ.
3-49. Gate mode NORM and FAST are two ranges of adjustable gate times. NORM has a range
of nominally 20 ms to 4 seconds, and FAST has a range of nominally 100 jus to 20 ms. The one key
causes the mode to toggle between NORM and FAST.
3-50. Gate mode MIN specifies the shortest possible gate time. This means that the signal itself
usually determines the time. For example, the Frequency A measurement uses a divide-by-2
prescaler. The gate time in this function would be determined by 2 periods of the input. MIN
mode is usually the mode used when External Stop Arm is used.
3-51. The MANUAL OPEN/CLOSE key lets you specify the gate time manually. In the manual
mode, each press of the key toggles the gate either open or closed. The status of the gate is
indicated by the GATE annunciator. Manual mode allows very long gate times.
3-52. Cycle mode NORM specifies about a 250 ms wait time between measurements. This slows
the display down to a rate that is more convenient for viewing short gate time measurements.
3-53. MIN mode tells the counter to start the next measurement as soon as possible. This gives
the most rapid updating of the display.
3-54. SINGLE lets you start measurements upon manual command. Each press of the key starts
one measurement. This measurement stays on the display until the key is pressed again (RESET
will also start a new measurement).
NOTE
A reminder that this counter uses synchronized gating, and that
the input signal also determines the length of the gate time.
Additionally, several modes of Arming are available, see Rear
Panel Features,
3-7
Model 5335A